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Category: physics
Adam Becker on More Everything Forever and Tech’s Future Myths
Last summer I sat down with Adam Becker and asked him to name the most confident story in tech.
He picked the one nobody in Silicon Valley is allowed to question: that godlike #AI, digital immortality, and space empires are simply where history is headed. Not a hope. A destination.
Becker has a PhD in astrophysics and fifteen years as a science journalist. In his book More Everything Forever, he takes that story apart and shows where it actually came from: misread science fiction, fringe mailing lists, and a very old colonial logic about who deserves the future. From there it walked straight into university labs, congressional hearings, and your feed.
His line from our conversation stayed with me: Silicon Valley has confused science fiction with science, and science with branding.
The stakes are not academic. While we debate the welfare of trillions of hypothetical posthuman minds, the actual world runs on war, climate collapse, widening inequality, and a shared reality coming apart. Becker calls the grand visions a distraction. I asked him whether a civilization can function without a myth of the future at all.
I do not agree with everything Adam argues, and that is exactly why this one is worth your time. Watch it and tell me who you think is right about the #Singularity.
The physics of kiiking, Estonia’s extreme sport of swinging
When an athlete swings upside down atop a 7-meter (23-foot) pendulum, it may seem like a feat of strength, courage or technique. A new study suggests it is something more fundamental: a striking demonstration of how intelligence emerges from the interaction of brain, body and environment.
In a paper published in the Journal of Nonlinear Science, Harvard researchers use mathematics, physics and control theory to analyze kiiking, an extreme sport invented in Estonia in which athletes pump a giant swing until they complete a full rotation.
At one level, the problem appears straightforward. The athlete repeatedly stands and squats to inject energy into the swing. Yet this simple action inspires a question that reaches far beyond sport, touching neuroscience, robotics, biology and human performance: How does an organism learn to exploit the dynamics of its environment to achieve a goal?
Nanoscale transistors achieve lower contact resistance with stepwise evaporation method
Metals, semiconductors and insulators are fundamental components of modern electronics. However, efforts to improve device performance have largely focused on semiconductor quality, while metal crystallinity has received far less attention.
As transistor dimensions continue to shrink, though, structural disorder in metals and at metal-semiconductor interfaces increasingly impedes carrier injection and transport. Metals therefore need a level of structural order comparable to that of single-crystal semiconductors to push device performance toward its physical limits.
To solve this problem, a research team led by Chu Junhao at the Shanghai Institute of Technical Physics (SITP) of the Chinese Academy of Sciences (CAS) has developed an atomic-scale stepwise evaporation method called Step-Eva that enables the direct in situ growth of single-crystal metal films on semiconductors. This process greatly reduces contact resistance and potentially redefines how transistors are built at the nanoscale.
Dark Stars May Have Left a Gravitational-Wave Signal We Can Detect Today
A new study suggests that pulsar timing arrays could help reveal how the Universe’s first supermassive black holes formed.
A faint background of extremely low-frequency gravitational waves, detected by monitoring networks of pulsars, may preserve clues from events that began more than 13 billion years ago. Among them could be the processes that produced some of the Universe’s earliest supermassive black holes.
Sohan Ghodla and Cosmin Ilie of Colgate University explored that possibility in a study published as a Letter in Physical Review D. Their goal was to determine whether supermassive black holes that originated in the early Universe could eventually account for a substantial share of the gravitational wave background now detected by Pulsar Timing Arrays, or PTAs.
Gamma-ray signal could be long awaited evidence for WIMPs
Dark matter is known to make up roughly 85% of all mass in the universe, as evidenced by the way galaxies spin and how galaxy clusters are held together under gravity. Yet despite decades of searching, physicists have never managed to detect the elusive substance directly.
In new research published in Physical Review Letters, a team led by Yi-Zhong Fan at the Chinese Academy of Sciences claims to have spotted a strong gamma-ray signal coming from a group of galaxy clusters, which could be among the most compelling evidence yet for a leading dark matter candidate known as WIMPs.
Exact calculations sharpen view of atomic nuclei
Every high-energy nuclear collision leaves behind a trail of clues about the structure of atomic nuclei. Deciphering those clues, however, depends on the accuracy of the underlying theory. Physicists at Osaka Metropolitan University have now performed a full calculation within Glauber theory, a cornerstone framework for describing high-energy nuclear collisions.
By overcoming a computational challenge that has long forced researchers to rely on approximations to reduce computational demands, the team has shown that its full calculation can accurately reproduce experimental data and provide a reliable framework for predicting the outcomes of future experiments involving ordinary and exotic nuclei.
The study was published in Physical Review Letters on May 18 and Physical Review C on June 1. Physical Review Letters provides a brief overview of the main findings, while Physical Review C contains the complete paper with additional details, results and analysis.
A 4-star system caught eclipsing itself in a way never seen before
Astronomers have found a four-star system doing something that has never been confirmed before. The system, TIC 433545934, has two close pairs of stars orbiting each other. While each pair eclipses its own two stars, as usual, only one pair eclipses the other. A paper outlining the properties of this unique system was submitted to the arXiv preprint server on Aug. 13. It has been accepted for publication in the journal Astronomy & Astrophysics.
Physicists Discover Time Crystals Can Communicate Across a Semiconductor
Separate time crystals inside a semiconductor can “find” each other across surprising distances and lock into the same rhythm.
Researchers at TU Dortmund University demonstrated the effect using a semiconductor system in which electron and nuclear spins form continuous time crystals. Their latest experiments, published in Nature Communications, reveal that spatially separated oscillators can lock to the same frequency even when they begin with different rhythms.
The finding builds on the team’s earlier demonstration of an unusually robust continuous time crystal in a semiconductor. That system produced persistent electron-nuclear spin oscillations with coherence lasting for hours, giving the researchers a stable platform for exploring what happens when several time crystals occupy the same material.
Laser-cut aluminum foil could replace costly terahertz polarizers
When physicists at the ARC Centre for Transformative Meta-Optical Systems (TMOS) needed a key component for their terahertz experiments, they ran into a frustrating problem—they needed tiny optical devices, known as wire-grid polarizers, but these cost thousands of dollars each.
“We were doing experiments in the terahertz frequency range and figured that some of the components—particularly polarizers—were extremely expensive,” says Professor Ilya Shadrivov from TMOS at The Australian National University. He is the co-author of a new study published in Optics and Laser Technology.
“So we looked at how they were made and thought, surely there’s a way to make them cheaper and faster.”