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Category: physics – Page 15

George Dyson on Turing’s Cathedral: In Wildness Is The Preservation Of The World

Fourteen years ago, I sat down with George Dyson to talk about “Turing’s Cathedral.”

We talked about the machines that were coming. Now they are here.

Dyson watched the digital revolution get built from the inside. His father was Freeman Dyson. Einstein’s secretary was his babysitter. He grew up at the Institute for Advanced Study in Princeton, playing in the halls where Turing’s ideas became von Neumann’s machines.

He gave me a line I still cannot shake:

“There is no way to completely govern the digital universe. It will always be a wildness, not a bureaucracy or a national park.”

Read it again. Then look at every #AI governance debate happening right now.

Continue reading “George Dyson on Turing’s Cathedral: In Wildness Is The Preservation Of The World” | >

Metallic rutile oxides break the rules of cooling

Physicists have long puzzled over a strange contradiction inside a family of minerals called rutile oxides. These materials all share the same crystal structure—but while some of them, like titanium dioxide, are firmly insulating, others, like ruthenium dioxide, conduct electricity like a metal. So far, physicists have had little idea of why this happens.

In a new study published in Physical Review B, researchers led by Kaushik Sen at the Indian Institute of Technology Delhi traced the answer back to phonons: the tiny vibrations that ripple through a material’s atomic lattice.

Their discovery reveals that metallic rutile oxides develop a fundamentally different relationship between electrons and phonons as they cool—settling a long-running scientific dispute along the way.

Evidence Mounts for Hierarchical Black Hole Mergers

Different analyses of gravitational-wave observations are converging on evidence for a distinct population of massive black hole binaries produced through repeated mergers.

Throughout the Universe, pairs of orbiting black holes emit ripples in spacetime that propagate across the cosmos. These gravitational waves carry away orbital energy, causing the black holes to slowly spiral closer together. This process is extremely slow, but, in a minority of cases, it leads to a cataclysmic merger within the age of the Universe. Since the historic detection of gravitational waves in 2015 (see Viewpoint: The First Sounds of Merging Black Holes), the LIGO, Virgo, and KAGRA gravitational-wave detectors have advanced to the point of recording a signal from merging black holes every few days of operation, yielding a cumulative catalog of hundreds [1]. Understanding how, when, and where the Universe produces these extreme astrophysical collisions remains an open question, with implications spanning physical scales from the subatomic to the cosmological.

Now, two teams led, respectively, by Cailin Plunkett at MIT [2] and Sharan Banagiri at Monash University in Australia [3] present evidence that a subset of binary black hole observations can be connected to a particular origin story: that of hierarchical mergers, in which at least one member of the pair is not the remnant of a dead star but instead the product of an earlier black hole merger (Fig. 1). The fact that these and other analyses [4– 10], based on markedly different assumptions, converge on a similar conclusion strengthens the case that hierarchical mergers constitute an important contribution to the binary black hole population.

Detecting neutron sources by borrowing inference tools from cosmology

Neutron sources can be directly identified from measured spectra rather than proxies using inference tools adapted from cosmology, according to a University of Michigan Engineering study published in Physical Review Applied. The method can improve nuclear security by helping intercept materials at ports or borders or guide first responders during emergency response.

Directly detecting and characterizing a neutron source remains a challenge because most nuclear materials emit neutrons with energy patterns, called neutron spectra, that look similar to one another—whether from a benign industrial isotope or fissile material.

“This problem sits at the intersection of fundamental physics, statistics and real-world nuclear security. There is a very practical need to identify unknown neutron-emitting materials, but there is also a deep scientific challenge: How do you extract reliable information from signals that are weak, noisy and highly similar?” said David Breitenmoser, a postdoctoral research fellow of nuclear engineering and radiological sciences at U-M and lead author of the study.

Tell Musk this is true human’s future

How will humanity power its interplanetary future?
In this cinematic documentary, we journey to the year 2,325, where humanity has finally achieved Type I civilization status. We explore the colossal engineering feats required to harvest the Sun’s energy from Mercury and beam it across the entire solar system.

▶A Film by: Scienshell.

In a universe where energy is the currency of survival, the diffused sunlight that has bathed our solar system for 5 billion years is no longer enough. To fuel a true interplanetary empire, humanity must harvest, concentrate, and transmit the immense power of our star. But harnessing such staggering amounts of energy requires pushing the absolute limits of physics and engineering.

As our energy needs grow, the line between theoretical physics and applied engineering begins to blur. For those who build the infrastructure of tomorrow, the solar system itself becomes a machine.

In this video, you’ll discover:
[00:00] Introduction.
[01:29] 2325: The Dawn of a Type I Civilization.
[02:15] Mining Mercury and the Solar Ring Construction.
[06:24] Photons: The Perfect Interplanetary Energy Carriers.
[08:12] The Beating Heart of the Energy Grid.
[11:02] Precursor Beams and Cosmic No-Fly Zones.
[13:01] The Danger of Runaway Gamma Beams.
[15:12] The Gamma Cascade: Converting Destructive Energy.
[17:34] Powering an Interplanetary Civilization.

▶ About This Video.

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How to Survive the Ultimate Cosmic Doomsday

What happens when the laws of the universe turn against existence itself?
In this cinematic 4K documentary, we journey through a hierarchy of cosmic catastrophes that challenge the survival of any civilization, from the localized death of planets to the absolute collapse of physical laws.

▶A Film by: Scienshell Studio.

In a universe governed by deep time and immense forces, disaster is not a matter of if, but when. From worlds frozen in perpetual schizophrenia by tidal locking to the ultimate recollapse of space-time, civilizations must either evolve to engineer the cosmos or face total eradication.

But as the scale of destruction grows, the line between technology and natural law begins to blur. For those who survive the end of the universe, reality itself becomes a blank canvas.

In this video, you’ll discover:
00:00 Introduction.
02:35 Tidally Locked Worlds and Planetary Accelerators.
05:35 Stellar Storms and Planetary Shield.
08:43 Supernovae and Star Lifting.
11:53 Supermassive Black Holes and The Space Nomads.
14:54 Interstellar Interceptors: The Predator and the Prey.
17:08 The Inflaton Field and The Big Crunch.
21:01 Higgs Field Decay: The Death of Matter and Gravity.
22:31 Beyond Physics: Civillization with godly powers.

▶ About This Video.

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7 Mind-Bending Physics Questions Sci-Fi Made Me Ask

Science fiction does more than imagine the future — it pushes the human mind to the edge of what it can understand.

In this video, we look at seven strange physics and philosophy questions inspired by sci-fi: Does the universe balance every action? What if our universe is not a closed system? If infinity is real, does everything eventually happen? When physics “breaks down,” is reality failing — or are we? Are human minds evolved to misunderstand the deepest universe? Is individuality just a useful illusion? And is math discovered, invented, or the best tool humans have for reaching beyond their own understanding?

Featuring ideas and examples inspired by Interstellar, Warhammer 40K, Interstellar, Star Trek, The Matrix, Dune, The Three-Body Problem, Arrival, Foundation, 2001: A Space Odyssey, The Expanse, Annihilation, Project Hail Mary, and more.

Science fiction begins where certainty ends.

#SciFi #Physics #Interstellar #Warhammer40K #TheMatrix #Dune #ThreeBodyProblem #Arrival #Foundation #VideoEssay #FilmAnalysis #ScienceFiction

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