BLOGS

AP Photo/Andres Kudacki

Topics: Applied Physics, Diversity in Science, Physics, Physiology

"B-boys and B-girls wield physics to pull off gravity-defying dance moves."

Okay, "gravity-defying" is a bit of hyperbole. Break dancing, as the article alludes, started in New York, and the movements can be found in martial arts like Brazilian Capoeira. It's more centrifugal force and torque, but I get that "gravity-defying" will get more clicks. I wish it didn't and the science behind it got more attention.

Two athletes square off for an intense dance battle. The DJ starts spinning tunes, and the athletes begin twisting, spinning and seemingly defying gravity, respectfully watching each other and taking turns showing off their skill.

The athletes converse through their movements, speaking through a dance that celebrates both athleticism and creativity. While the athletes probably aren’t consciously thinking about the physics behind their movements, these complex and mesmerizing dances demonstrate a variety of different scientific principles.

Breaking, also known as breakdancing, originated in the late 1970s in the New York City borough of the Bronx. Debuting as an Olympic sport in the 2024 Summer Olympics, breaking will showcase its dynamic moves on a global stage. This urban dance style combines hip-hop culture, acrobatic moves and expressive footwork.

Physics In Action: Paris 2024 Olympics To Debut High-Level Breakdancing, Amy Pope, Clemson University

Image source: Wikipedia/Pine_Tree_Flag

Since its creation during the American Revolution, the flag has carried a message of defiance: The phrase “appeal to heaven” comes from the 17th-century philosopher John Locke, who wrote of a responsibility to rebel, even use violence, to overthrow unjust rule.

Another Provocative Flag Was Flown at Another Alito Home, Jodi Kantor, Aric Toler and Julie Tate, New York Times

Topics: Civics, Civil Rights, Civilization, Democracy, Existentialism, Fascism

So what is the Comstock Act? Many of us have heard of it, if only vaguely. We may also have heard the term “Comstockery,” defined as the “strict censorship of materials considered obscene” and “censorious opposition to alleged immorality,” and know that it was coined by playwright George Bernard Shaw.

The occasion was the removal of Shaw’s Man and Superman from the shelves of the New York Public Library in 1905. Taking umbrage and spotting an opportunity, Shaw fired back, announcing his intention to bring “Mrs. Warren’s Profession”—a play that had been banned in London for its frank discussion of prostitution—to New York, telling the city’s papers, “Comstockery is the world’s standing joke at the expense of the United States. It confirms the deep-seated conviction of the Old World that America is a provincial place, a second-rate country-town civilization after all.”

Anthony Comstock, by then America’s leading moralist, hadn’t heard of Shaw until the playwright’s words were published in the papers. He did a little quick brushing up and fired back, calling Shaw an “Irish smut peddler” and alerting the New York police to the dangerous content of Shaw’s play. He also wrote a huffy letter to Shaw’s producer Arnold Daly, calling “Mrs. Warren’s Profession” “filthy” and quoting, with an ominous tone of warning, recent court decisions in obscenity cases. Daly, a savvy publicity man, did not let the opportunity go by. He sent Comstock’s letter to all the papers, along with an exquisitely civil response inviting Comstock to come to a rehearsal. 

The result? Ticket sales went through the roof, and the play was sold out weeks before the curtain went up. The police were called forth on opening night—not to raid the play, but to dispel the overflow mob in the streets clamoring to get in. Score one for GBS.

A Nationwide Abortion Ban Could Really Happen. You Can Thank Anthony Comstock’s Suitcase Full of Dildos. Eleanor Clooney, Mother Jones

George Bernard Shaw, in The Guardian article from 1997, is lauded as one of the "founding fathers of British socialism," which also meant at the time that he was an avowed eugenicist. (The title of the play was a dead giveaway.) The author of "The Handmaid's Tale," Margaret Atwood, has said in interviews that she's not keen on the term "progressive," since it was born in the era of trying to breed "better humans" and sterilize underserving others.

However, Comstock managed to model for conservatives yet born the extremism that we are now witness to in the 21st Century. He's noted in her research for "setting up stings" and physically fighting against those he SET UP in the sting because only he was the "righteous one." He was also known for pouring out his ration of whiskey as pious as any of the Pharisees, so he wasn't particularly the "life of the party" as the Continental Army fought the War of Independence for "religious freedom" and to skip out on the taxes the colonists owed King George of England.

I do agree with Clooney's article on one thing: this puritanism is inherent in human culture. It's been with us since, metaphorically, Eden.

I do appreciate from her that we have had, and probably always will have puritanism: "behavior or beliefs that are based on strict moral or religious principles, especially the principle that people should avoid physical pleasures." Collins Dictionary In that respect, Osama Bin Laden was a Muslim puritan, influenced still by the author Sayyid Qutb (1906—1966). "As an Islamist, he held that all aspects of society should be conducted according to the Shari’a, that is, laws of God as derived from the Qur’an and the practice (sunna) of the Prophet Muhammad. Probably his best known and most distinctive doctrine is his interpretation of jahiliyya (pre-Islamic ignorance) as characterizing all of the societies of his time, including the Muslim ones." Internet Encyclopedia of Philosophy/Sayyid Qutb

*****

The Louisiana House approved a bill Tuesday that would add two medications commonly used to induce abortions to the state’s list of controlled dangerous substances, making possession of the drugs without valid prescriptions a crime punishable by fines, jail time or both.

The measure, which has drawn support from anti-abortion groups and alarm from medical professionals and reproductive rights advocates, would add the medications mifepristone and misoprostol to Schedule IV of the state’s Uniform Controlled Dangerous Substances Law. Abortion — both medical and surgical — is illegal in Louisiana, so it is already illegal to prescribe the medications to terminate pregnancies, except in very limited circumstances.

Medication abortions accounted for 63% of all abortions last year, according to the reproductive rights think tank the Guttmacher Institute.

The bill passed 64-29 in the GOP-controlled House of Representatives. It will now go back to the Senate, and if it is approved, it would then be sent to the governor to sign into law.

Louisiana House passes bill to make abortion pills a controlled dangerous substance, Daniella Silva, Marissa Parra and Natalie Obregon, NBC News.

There is a desperation in these actions at the oxymoronically-named Supreme Court and local levels: "Demographics is destiny" is being fought tooth and nail.

I think it is instructive that white evangelicals became a numerical minority in 2017. In 2045 or sooner, white Americans are projected to be 49.7% of the population (Brookings) versus 50.3% of all ethnic groups combined (African Americans projected to remain around 13%). It's slight, it's petty, but it does explain a lot about them, even the repeal of Roe v Wade: Kate Cox in Dallas wasn't arrested for seeking an abortion outside of Texas. Brittany Watts in Ohio was criminally charged with a miscarriage in a toilet that could have been avoided had the state not banned the procedure and threatened doctors with arrest. Thankfully, the grand jury overturned it.

White woman: A mulligan. No arrest, but instructive that authorities will look the other way because she will "help" in the anxious arithmetic of white supremacy.
Black woman: A prison sentence (if they could), and a toilet for her fetus.

We may never see a national abortion ban, but that may be unnecessary if the spirit of Anthony Comstock is invoked in these draconian measures NATIONWIDE.

The phrase “appeal to heaven” comes from the 17th-century philosopher John Locke, who wrote of a responsibility to rebel, even use violence, to overthrow unjust rule.

It's the formula for the Republic of Gilead in "The Handmaid's Tale." Like the fictional "Sons of Jacob" before the hierarchy of the Commanders, they are willing to do violence to bring about their fever dreams of of a "united Reich" dictatorship.

Perhaps we humans are simply the ultimate expression of Comstockery, cognitive dissonance allowing us to gaslight collectively into thinking of ourselves as "blessed," the "Promised Land," "Manifest Destiny," Homo Sapiens ("wise men"): we have created works of artistry, delved into the mysteries of quantum mechanics, split the atom, created technologies at nanoscales and have the ability to launch objects into near orbit or, for interplanetary and interstellar journeys, and simultaneously created several means to end our existence, and all life on the planet. Instead, the more apt description, Homo Stultus ("stupid men"), is apropos because intelligence applied without thought of the consequences beyond a business quarter is active, abject stupidity! It does, however, resolve the Fermi Paradox: Intelligence might well be its own Entropy. The aliens that we seem to have not yet communicated with or made contact with might have killed themselves. This is hopefully instructive. Humanity needs to pass through its "great filter" to build starships.

Worrying trend Reliable climate models are needed so that societies can adapt to the impact of climate change. (Courtesy: Shutterstock/Migel)

Topics: Applied Physics, Atmospheric Science, CERN, Civilization, Climate Change

It was a scorcher last year. Land and sea temperatures were up to 0.2 °C (32.36 °F) higher every single month in the second half of 2023, with these warm anomalies continuing into 2024. We know the world is warming, but the sudden heat spike had not been predicted. As NASA climate scientist Gavin Schmidt wrote in Nature recently: “It’s humbling and a bit worrying to admit that no year has confounded climate scientists’ predictive capabilities more than 2023 has.”

As Schmidt went on to explain, a spell of record-breaking warmth had been deemed “unlikely” despite 2023 being an El Niño year, where the relatively cool waters in the central and eastern equatorial Pacific Ocean are replaced with warmer waters. Trouble is, the complex interactions between atmospheric deep convection and equatorial modes of ocean variability, which lie behind El Niño, are poorly resolved in conventional climate models.

Our inability to simulate El Niño properly with current climate models (J. Climate 10.1175/JCLI-D-21-0648.1) is symptomatic of a much bigger problem. In 2011 I argued that contemporary climate models were not good enough to simulate the changing nature of weather extremes such as droughts, heat waves and floods (see “A CERN for climate change” March 2011 p13). With grid-point spacings typically around 100 km, these models provide a blurred, distorted vision of the future climate. For variables like rainfall, the systematic errors associated with such low spatial resolution are larger than the climate-change signals that the models attempt to predict.

Reliable climate models are vitally required so that societies can adapt to climate change, assess the urgency of reaching net-zero or implement geoengineering solutions if things get really bad. Yet how is it possible to adapt if we don’t know whether droughts, heat waves, storms or floods cause the greater threat? How do we assess the urgency of net-zero if models cannot simulate “tipping” points? How is it possible to agree on potential geoengineering solutions if it is not possible to reliably assess whether spraying aerosols in the stratosphere will weaken the monsoons or reduce the moisture supply to the tropical rainforests? Climate modelers have to take the issue of model inadequacy much more seriously if they wish to provide society with reliable actionable information about climate change.

I concluded in 2011 that we needed to develop global climate models with spatial resolution of around 1 km (with compatible temporal resolution) and the only way to achieve this is to pool human and computer resources to create one or more internationally federated institutes. In other words, we need a “CERN for climate change” – an effort inspired by the particle-physics facility near Geneva, which has become an emblem for international collaboration and progress.

Why we still need a CERN for climate change, Tim Palmer, Physics World

Filled with briny lakes, the Quisquiro salt flat in South America's Altiplano region represents the kind of landscape that scientists think may have existed in Gale Crater on Mars, which NASA's Curiosity Rover is exploring. Credit: Maksym Bocharov

Topics: Astrobiology, Astrophysics, Atmospheric Science, Mars, NASA, Planetary Science

The most surprising revelation from NASA's Curiosity Mars Rover—that methane is seeping from the surface of Gale Crater—has scientists scratching their heads.

Living creatures produce most of the methane on Earth. But scientists haven't found convincing signs of current or ancient life on Mars, and thus didn't expect to find methane there. Yet, the portable chemistry lab aboard Curiosity, known as SAM, or Sample Analysis at Mars, has continually sniffed out traces of the gas near the surface of Gale Crater, the only place on the surface of Mars where methane has been detected thus far. Its likely source, scientists assume, are geological mechanisms that involve water and rocks deep underground.

If that were the whole story, things would be easy. However, SAM has found that methane behaves in unexpected ways in Gale Crater. It appears at night and disappears during the day. It fluctuates seasonally and sometimes spikes to levels 40 times higher than usual. Surprisingly, the methane also isn't accumulating in the atmosphere: ESA's (the European Space Agency) ExoMars Trace Gas Orbiter, sent to Mars specifically to study the gas in the atmosphere, has detected no methane.

Why is methane seeping on Mars? NASA scientists have new ideas, Lonnie Shekhtman, NASA, Phys.org.

NIJI 6 CONTEST - MAY 21-23, 2024
Contest Theme and Rules...
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Two researchers have revised the Drake equation, a mathematical formula for the probability of finding life or advanced civilizations in the universe.

University of Rochester. Are We Alone in the Universe? Revisiting the Drake Equation, NASA

Topics: Astrobiology, Astrophysics, Artificial Intelligence, Civilization, SETI

See: Britannica.com/The-Fermi-Paradox/Where-Are-All-The-Aliens

Abstract
This study examines the hypothesis that the rapid development of Artificial Intelligence (AI), culminating in the emergence of Artificial Superintelligence (ASI), could act as a "Great Filter" that is responsible for the scarcity of advanced technological civilizations in the universe. It is proposed that such a filter emerges before these civilizations can develop a stable, multiplanetary existence, suggesting the typical longevity (L) of a technical civilization is less than 200 years. Such estimates for L, when applied to optimistic versions of the Drake equation, are consistent with the null results obtained by recent SETI surveys, and other efforts to detect various techno-signatures across the electromagnetic spectrum. Through the lens of SETI, we reflect on humanity's current technological trajectory – the modest projections for L suggested here, underscore the critical need to quickly establish regulatory frameworks for AI development on Earth and the advancement of a multiplanetary society to mitigate against such existential threats. The persistence of intelligent and conscious life in the universe could hinge on the timely and effective implementation of such international regulatory measures and technological endeavors.

Is artificial intelligence the great filter that makes advanced technical civilizations rare in the universe? Michael A. Garrett, Acta Astronautica, Volume 219, June 2024, Pages 731-735

Topics: Civics, Civil Rights, Civilization, Existentialism, Fascism, History

“On **May 17, 1954**, U.S. Supreme Court Justice Earl Warren delivered the unanimous ruling in the landmark civil rights case Brown v. Board of Education of Topeka, Kansas. State-sanctioned segregation of public schools was a violation of the 14th Amendment and was, therefore, unconstitutional. This historic decision marked the end of the "separate but equal" precedent set by the Supreme Court nearly 60 years earlier in Plessy v. Ferguson. It served as a catalyst for the expanding civil rights movement during the decade of the 1950s.”

Source: https://www.archives.gov/milestone-documents/brown-v-board-of-education

Dr. Martin Luther King Jr was assassinated on April 4, 1968, a Thursday. My graduating kindergarten class at Bethlehem Community Center in Winston-Salem, North Carolina, was told by our teachers on Friday, who cried with us and reassured us that the men outside with Confederate flags, shooting in the air, reveling “that n----r’s dead” would not harm us, or prevent our celebration. We slept as well [as possible] through nap time and dressed for our day and [our] parents. Not one child in my photo of the event is smiling. Not one.

I attended segregated schools in Winston-Salem, NC, until my fourth grade year in 1971. “All deliberate speed” had some considerable foot-dragging.

I was bused across town for 4^th grade only to Rural Hall, and their kids were bused across town to Fairview Elementary for 5th and 6th grade. I was bused to Mineral Springs Middle School for 7th -8th grade. ALL the former Black High Schools, like Atkins, Carver, Hanes, and Paisley, had to be “9th and 10th grades only,” as North, East, Parkland, and West were reserved for the higher grades for high school graduation.

“We have fought hard and long for integration, as I believe we should have, and I believe that we will win, but I have come to believe that we are integrating into a burning house. I’m afraid that America has lost the moral vision she may have had,” as the nation is not deeply concerned “with the plight of the poor and disenfranchised.” This failure, King argued, would only further stoke “the anger and violence that tears the soul of this nation. I fear I am integrating my people into a burning house.” Dr. King confessed to his friend, the Civil Rights activist and entertainer Harry Belafonte.

I am sixty-one years old, a grandfather, and a late entrant to the ranks of a Ph.D. I am sad to say that despite the movement's optimism, NOTHING has changed.

Ecclesiastes 1:9 “The thing that hath been, it is that which shall be and that which is done is that which shall be done: and there is no new thing under the sun.”

“What's past is prologue.” William Shakespeare, The Tempest.

This is the moment you’ve all been waiting for... the swashbuckling Spider is coming to

! Follow the pre-launch and get ready for vengeance.

Dark Spider pre-launch link

I grew up reading comic books since the mid-eighties before there were comic books shops. Back then, we got our comic books from spinner racks in convenience stores. Back then, they were worth .75 cents.

That was the beginning into the world of fiction. I have written poems, screenplays, novels and digital contents.

Overtime, I have read all forms of comics, graphic novels, anime and more. I am extremely fond of the Golden, Silver and Bronze Age of Comics along with Old Time Radio programs and movie serials.

As I began to appreciate the vintage age of comics and radio programs, I realized that there was an extreme lack of diversity in its stories.

Occasionally, I would come across gems like All-Negro Comics from 1947 by Journalist Orrin Evans. Weird Fantasy Comics #18 brought "Judgement Day". a story of a black man deciding if a robot civilization can enter a galactic federation but denies them entrance since they discriminate another robot race because of their color. Another great story is from Weird Science #22 called "Outcast of the Stars." This story is about a Italian man who attempts to take his poor family to Mars like other prosperous families.

The Golden Age of stories really made an impact when it challenges the social norms of the time. A great radio program called "Superman versus the KKK" speaks for itself.

Heroes Like Me Presents will recreate that time period with more diverse stories for a modern audience. These will be stories that should have been told but wasn't. The Golden Age Begins Again.

Because We Can. Come along for the ride

Expect the first issue to be out by July 2024 at Indyplanet.com/Heroes-Like-Me

-Chris Love
May 12 2024

ON SALE NOW

Heroes Like Me Presents #1 - IndyPlanet

(a) Schematics of the word INFORMATION is written on a material in binary code using magnetic recording. Red denotes magnetization pointing out of the plane and blue is magnetization pointing into the plane. (b)–(d) Time evolution of the digital magnetic recording information states simulated using micromagnetic Monte Carlo. (b) Initial random state. (c) INFORMATION is written (t = 0 s). (d) Iteration 930 (t = 1395 s) showing the degradation of information states. Reproduced with permission from M. M. Vopson and S. Lepadatu, AIP Adv. 12, 075310 (2022). Copyright 2022 AIP Publishing.

Topics: Chemistry, DNA, General Relativity, Genetics, Nucleotides, Thermodynamics

Reference: Electronic Orbitals, Chem Libre Text dot org

As Morpheus describes, “You take the blue pill, the story ends. You wake up in your bed and believe whatever you want to believe. You take the red pill; you stay in Wonderland. And I show you how deep the rabbit hole goes.” Neo takes the red pill and wakes up in the real world. Source: Britannica Online: Red Pill and Blue Pill Symbolism

The simulation hypothesis is a philosophical theory in which the entire universe and our objective reality are just simulated constructs. Despite the lack of evidence, this idea is gaining traction in scientific circles as well as in the entertainment industry. Recent scientific developments in the field of information physics, such as the publication of the mass-energy-information equivalence principle, appear to support this possibility. In particular, the 2022 discovery of the second law of information dynamics (infodynamics) facilitates new and interesting research tools at the intersection between physics and information. In this article, we re-examine the second law of infodynamics and its applicability to digital information, genetic information, atomic physics, mathematical symmetries, and cosmology, and we provide scientific evidence that appears to underpin the simulated universe hypothesis.

Introduction

In 2022, a new fundamental law of physics has been proposed and demonstrated, called the second law of information dynamics or simply the second law of infodynamics.¹ Its name is an analogy to the second law of thermodynamics, which describes the time evolution of the physical entropy of an isolated system, which requires the entropy to remain constant or to increase over time. In contrast to the second law of thermodynamics, the second law of infodynamics states that the information entropy of systems containing information states must remain constant or decrease over time, reaching a certain minimum value at equilibrium. This surprising observation has massive implications for all branches of science and technology. With the ever-increasing importance of information systems such as digital information storage or biological information stored in DNA/RNA genetic sequences, this new powerful physics law offers an additional tool for examining these systems and their time evolution.² 

The second law of infodynamics and its implications for the simulated universe hypothesis, Melvin M. Vopson, AIP Advances

NIJI 6 CONTEST - MAY 02-04, 2024
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An illustration of NASA's Orion spacecraft in orbit around the moon. (Image credit: Lockheed Martin)

Topics: Astronautics, History, NASA, Space Exploration, Spaceflight

Between 1969 and 1972, the Apollo missions sent a total of a dozen astronauts to the surface of the moon — and that was before the explosion of modern technology. So why does it seem like our current efforts, as embodied by NASA's Artemis program, are so slow, halting and complex? 

There isn't one easy answer, but it comes down to money, politics, and priorities.

Let's start with the money. Yes, the Apollo missions were enormously successful — and enormously expensive. At its peak, NASA was consuming around 5% of the entire federal budget, and more than half of that was devoted to the Apollo program. Accounting for inflation, the entire Apollo program would cost over $260 billion in today's dollars. If you include project Gemini and the robotic lunar program, which were necessary precursors to Apollo, that figure reaches over $280 billion.

In comparison, today, NASA commands less than half a percent of the total federal budget, with a much broader range of priorities and directives. Over the past decade, NASA has spent roughly $90 billion on the Artemis program. Naturally, with less money going to a new moon landing, we're likely to make slower progress, even with advancements in technology.

Why is it so hard to send humans back to the moon? Paul Sutter, Space.com.

Scientists detected 2-Methoxyethanol in space for the first time using radio telescope observations of the star-forming region NGC 6334I. Credit: Massachusetts Institute of Technology

Topics: Astronomy, Chemistry, Instrumentation, Interstellar, Research, Spectrographic Analysis

New research from the group of MIT Professor Brett McGuire has revealed the presence of a previously unknown molecule in space. The team's open-access paper, "Rotational Spectrum and First Interstellar Detection of 2-Methoxyethanol Using ALMA Observations of NGC 6334I," was published in the April 12 issue of The Astrophysical Journal Letters.

Zachary T.P. Fried, a graduate student in the McGuire group and the lead author of the publication worked to assemble a puzzle comprised of pieces collected from across the globe, extending beyond MIT to France, Florida, Virginia, and Copenhagen, to achieve this exciting discovery.

"Our group tries to understand what molecules are present in regions of space where stars and solar systems will eventually take shape," explains Fried. "This allows us to piece together how chemistry evolves alongside the process of star and planet formation. We do this by looking at the rotational spectra of molecules, the unique patterns of light they give off as they tumble end-over-end in space.

"These patterns are fingerprints (barcodes) for molecules. To detect new molecules in space, we first must have an idea of what molecule we want to look for, then we can record its spectrum in the lab here on Earth, and then finally we look for that spectrum in space using telescopes."

Researchers detect a new molecule in space, Danielle Randall Doughty, Massachusetts Institute of Technology, Phys.org.

Researchers have synthesized sheets of gold that are one atom thick. Credit: imaginima/Getty

Topics: Graphene, Materials Science, Nanoengineering, Nanomaterials, Solid-State Physics

It is the world’s thinnest gold leaf: a gossamer sheet of gold just one atom thick. Researchers have synthesized¹ the long-sought material, known as goldene, which is expected to capture light in ways that could be useful in applications such as sensing and catalysis.

Goldene is a gilded cousin of graphene, the iconic atom-thin material made of carbon that was discovered in 2004. Since then, scientists have identified hundreds more of these 2D materials. But it has been particularly difficult to produce 2D sheets of metals, because their atoms have always tended to cluster together to make nanoparticles instead.

Researchers have previously reported single-atom-thick layers of tin² and lead³ stuck to various substances, and they have produced gold sheets sandwiched between other materials. But “we submit that goldene is the first free-standing 2D metal, to the best of our knowledge”, says materials scientist Lars Hultman at Linköping University in Sweden, who is part of the team behind the new research. Crucially, the simple chemical method used to make goldene should be amenable to larger-scale production, the researchers reported in Nature Synthesis on 16 April¹.

“I’m very excited about it,” says Stephanie Reich, a solid-state physicist and materials scientist at the Free University of Berlin, who was not involved in the work. “People have been thinking for quite some time how to take traditional metals and make them into really well-ordered 2D monolayers.”

In 2022, researchers at New York University Abu Dhabi (NYUAD) said that they had produced goldene, but the Linköping team contends that the prior material probably contained multiple atomic layers, on the basis of the electron microscopy images and other data that were published in ACS Applied Materials and Interfaces⁴. Reich agrees that the 2022 study failed to prove that the material was singler-layer goldene. The principal authors of the NYUAD study did not respond to Nature’s questions about their work.

Meet ‘goldene’: this gilded cousin of graphene is also one atom thick, Mark Peplow, Nature

Source: Same source for the Dark Matter definition below.

Topics: Astronomy, Astrophysics, Cosmology, Dark Matter, Einstein, General Relativity

Note: Your "secret decoder ring" for reading the Abstract.

Dark matter: It makes up about 85% of the universe, is invisible, and doesn't interact with matter except for gravitational effects. See: Center for Astrophysics, Harvard

"Tachyonic": Of, or referring to tachyons, (Greek for swift) theoretical particles that already travel faster-than-light and backward in time. Their rest mass, m₀ⁱ, is assumed to be imaginary. As it loses energy, it's assumed to become infinitely fast, so you can see why it's a favorite science fiction trope, along with dark matter, literally tableau rasas.

ΛCDM assumes that the universe is composed of photons, neutrinos, ordinary matter (baryons, electrons), and cold (non-relativistic) dark matter, which only interacts gravitationally, plus "dark energy," which is responsible for the observed acceleration in the Hubble expansion. Source: Goddard Spaceflight Center: Lambda

H₀ defines the Hubble constant, or, the rate at which the universe is expanding, determined by Hubble in the way back year of 1929 to be 500 km/s/Mpc. I'm going to defer to Wikipedia for this one.

km/s/Mpc = kilometers/second/megaparsec. Megaparsec is 1 million parsecs = 3,260,000 light years, or 3.26 x 10⁶ light years.

t₀ = the present age of the universe, t₀ = 2tH/3, where "tH" is the Hubble time. t₀ is roughly 13.7 × 10⁹ years, or 4.32 × 10¹⁷ seconds.

Gyr = giga years, or 1 billion years = 1 x 10⁹ years (a lot).

Abstract

An open or hyperbolic Friedmann-Robertson-Walker spacetime dominated by tachyonic dark matter can exhibit an “inflected” expansion—initially decelerating, later accelerating—similar but not identical to that of now-standard ΛCDM models dominated by dark energy. The features of the tachyonic model can be extracted by fitting the redshift-distance relation of the model to data obtained by treating Type Ia supernovae as standard candles. Here such a model is fitted to samples of 186 and 1048 Type Ia supernovae from the literature. The fits yield values of H₀ = (66.6±1.5) km/s/Mpc and H₀ = (69.6±0.4) km/s/Mpc, respectively, for the current-time Hubble parameter, and t₀ = (8.35 ± 0.68) Gyr and t₀ = (8.15 ± 0.36) Gyr, respectively, for the comoving-time age of the Universe. Tests of the model against other observations will be undertaken in subsequent works.

Subject headings: cosmology, dark matter, tachyons, distance-redshift relation, supernovae

Testing Tachyon-Dominated Cosmology with Type Ia Supernovae, Samuel H. Kramer, Ian H. Redmount, Physics arXiv

Credit: Menno Schaefer/Adobe

Starlings flock in a so-called murmuration, a collective behavior of interest in biological physics — one of many subfields that did not always “belong” in physics.

Topics: Applied Physics, Cosmology, Einstein, History, Physics, Research, Science

"To be rather than to seem." Translated from the Latin Esse Quam Videri, which also happens to be the state motto of North Carolina. It is from the treatise on Friendship by the Roman statesman Cicero, a reminder of the beauty and power of being true to oneself. Source: National Library of Medicine: Neurosurgery

If you’ve been in physics long enough, you’ve probably left a colloquium or seminar and thought to yourself, “That talk was interesting, but it wasn’t physics.”

If so, you’re one of many physicists who muse about the boundaries of their field, perhaps with colleagues over lunch. Usually, it’s all in good fun.

But what if the issue comes up when a physics faculty makes decisions about hiring or promoting individuals to build, expand, or even dismantle a research effort? The boundaries of a discipline bear directly on the opportunities departments can offer students. They also influence those students’ evolving identities as physicists, and on how they think about their own professional futures and the future of physics.

So, these debates — over physics and “not physics” — are important. But they are also not new. For more than a century, physicists have been drawing and redrawing the borders around the field, embracing and rejecting subfields along the way.

A key moment for “not physics” occurred in 1899 at the second-ever meeting of the American Physical Society. In his keynote address, the APS president Henry Rowland exhorted his colleagues to “cultivate the idea of the dignity” of physics.

“Much of the intellect of the country is still wasted in the pursuit of so-called practical science which ministers to our physical needs,” he scolded, “[and] not to investigations in the pure ethereal physics which our Society is formed to cultivate.”

Rowland’s elitism was not unique — a fact that first-rate physicists working at industrial laboratories discovered at APS meetings, when no one showed interest in the results of their research on optics, acoustics, and polymer science. It should come as no surprise that, between 1915 and 1930, physicists were among the leading organizers of the Optical Society of America (now Optica), the Acoustical Society of America, and the Society of Rheology.

That acousticians were given a cold shoulder at early APS meetings is particularly odd. At the time, acoustics research was not uncommon in American physics departments. Harvard University, for example, employed five professors who worked extensively in acoustics between 1919 and 1950. World War II motivated the U.S. Navy to sponsor a great deal of acoustics research, and many physics departments responded quickly. In 1948, the University of Texas hired three acousticians as assistant professors of physics. Brown University hired six physicists between 1942 and 1952, creating an acoustics powerhouse that ultimately trained 62 physics doctoral students.

The acoustics landscape at Harvard changed abruptly in 1946, when all teaching and research in the subject moved from the physics department to the newly created department of engineering sciences and applied physics. In the years after, almost all Ph.D. acoustics programs in the country migrated from physics departments to “not physics” departments.

The reason for this was explained by Cornell University professor Robert Fehr at a 1964 conference on acoustics education. Fehr pointed out that engineers like himself exploited the fundamental knowledge of acoustics learned from physicists to alter the environment for specific applications. Consequently, it made sense that research and teaching in acoustics passed from physics to engineering.

It took less than two decades for acoustics to go from being physics to “not physics.” But other fields have gone the opposite direction — a prime example being cosmology.

Albert Einstein applied his theory of general relativity to the cosmos in 1917. However, his work generated little interest because there was no empirical data to which it applied. Edwin Hubble’s work on extragalactic nebulae appeared in 1929, but for decades, there was little else to constrain mathematical speculations about the physical nature of the universe. The theoretical physicists Freeman Dyson and Steven Weinberg have both used the phrase “not respectable” to describe how cosmology was seen by physicists around 1960. The subject was simply “not physics.”

This began to change in 1965 with the discovery of thermal microwave radiation throughout the cosmos — empirical evidence of the nearly 20-year-old Big Bang model. Physicists began to engage with cosmology, and the percentage of U.S. physics departments with at least one professor who published in the field rose from 4% in 1964 to 15% in 1980. In the 1980s, physicists led the satellite mission to study the cosmic microwave radiation, and particle physicists — realizing that the hot early universe was an ideal laboratory to test their theories — became part-time cosmologists. Today, it’s hard to find a medium-to-large sized physics department that does not list cosmology as a research specialty.

Opinion: That's Not Physics, Andrew Zangwill, APS