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#physics

330 posts219 participants27 posts today
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Ethan Siegel

How come we’ve never observed a black hole decaying? Black holes, according to Stephen Hawking, should emit radiation from outside their event horizons, ultimately decaying away completely. So why haven't we ever seen it happening? bigthink.com/starts-with-... #space #astro #physics

How come we've never observed ...

Big ThinkHow come we've never observed a black hole decaying?According to Stephen Hawking, spontaneously emitted radiation should cause all black holes to decay. But we've never seen it: not even once.
Public
Nicole Sharp

Playful Martian Dust Devils

The Martian atmosphere lacks the density to support tornado storm systems, but vortices are nevertheless a frequent occurrence. As sun-warmed gases rise, neighboring air rushes in, bringing with it any twisted shred of vorticity it carries. Just as an ice skater pulling her arms in spins faster, the gases spin up, forming a dust devil.

In this recent footage from the Perseverance Rover, four dust devils move across the landscape. In the foreground, a tiny one meets up with a big 64-meter dust devil, getting swallowed up in the process. It’s hard to see the details of their crossing, but you can see other vortices meeting and reconnecting here. (Video and image credit: NASA/JPL-Caltech/LANL/CNES/CNRS/INTA-CSIC/Space Science Institute/ISAE-Supaero/University of Arizona; via Gizmodo)

Black and white video illustrating a small Martian dust devil catching up to and getting swallowed up by a larger dust devil.
#atmosphericScience#conservationOfAngularMomentum#dustDevils
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Bhavani Shankar 💭
@tomcapuder @cbontenbal Interesting. I think science definitely has a chance of making up something useful but we need a huge leap of faith to think it arrives at the truth.

Science keeps discarding things that were thought to be real like electric, heat fluids, luminiferous ether etc. We can make an inductive argument that it'll continue - the world as described by science will keep changing and therefore it is not real.

Multiple (sometimes incompatible and infinite) theories and interpretations exist which give the exact same phenomenon. The one accepted by science is based on luck - the first to make novel predictions.

We are stepping into the realm of the unobservable in advanced physics like string theory. Should we discard these pieces or update the definition and methods of science?

Success of scientific investigation is based on luck too. For example, billions of years in the future the light from other galaxies will be undetectable. But human records from today will say they observed many galaxies. Which one should the future humans believe?

So I don't think it's just "mental masturbation" to open our minds to other (potential) sources of knowledge. That's how we progress and enjoy life. 😄

#science #philosophy #philosophyofscience #physics #metaphysics
#metaphysics
Public
Anthony David

Weekly lab report:

One day only this week, due to ongoing health issues. All good.

My 10yo grandson came in again, though it was a truncated visit to the lab. I got to talk to him about the consequences of choices of staying up late. He really wanted to explore the Mach-Zendeer Interferometer his older sister had helped construct earlier in the year. I was able to explain how the beam splitters worked and how the adjustable stage allowed us to vary the path of one of the beam paths. I described how interference worked from a "light as a wave" perspective. He is a good listener, as a couple of days later I was discussing something about waves and he said "wait, isn't that how interference works". Another high five from grandpa. When I get some time, we can rig up a double-slit experiemnt at home. My grand daughter had previously costed all the components for the Mach-Zender setup so she could replicate it at home. She stopped at $10k.

Data has been gathered to help identify the Pockels Cell issue. Our postdoc suggested the current issue for one of them may be related to the power supply, which would be cheaper to replace than a Pockels Cell. Awaiting info from our laser supplier.

We met a visiting student over vid link, who will be visitng the lab. A new PhD student will start in our lab next week. Exciting.

The Mechanical workshop's custom small gas bottle storage solution was installed. I am very pleased with the result.

My deep reading ability has improved a bit. I had a good chat with my younger brother and he shared similar reading behaviour issues when he was in my state of mind. I am patiently working through it.

I often say that education rewires the brain and gives one a new perspective on oneself and the world. This process I am going through feels like entire looms are being pulled out for reconfiguration.
I have been driving this brain around in this state for decades. Things take time, take time (H/T Courtney Barnett)

#phdlife#physics#mentalheaIth
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Rxiv mechanobio

📰 "Equilibrium Conserving Neural Operators for Super-Resolution Learning"
arxiv.org/abs/2504.13422 #Physics.Comp-Ph #Mechanics #Matrix #Cs.Lg

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arXiv.orgEquilibrium Conserving Neural Operators for Super-Resolution LearningNeural surrogate solvers can estimate solutions to partial differential equations in physical problems more efficiently than standard numerical methods, but require extensive high-resolution training data. In this paper, we break this limitation; we introduce a framework for super-resolution learning in solid mechanics problems. Our approach allows one to train a high-resolution neural network using only low-resolution data. Our Equilibrium Conserving Operator (ECO) architecture embeds known physics directly into the network to make up for missing high-resolution information during training. We evaluate this ECO-based super-resolution framework that strongly enforces conservation-laws in the predicted solutions on two working examples: embedded pores in a homogenized matrix and randomly textured polycrystalline materials. ECO eliminates the reliance on high-fidelity data and reduces the upfront cost of data collection by two orders of magnitude, offering a robust pathway for resource-efficient surrogate modeling in materials modeling. ECO is readily generalizable to other physics-based problems.
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jan
When in his early texts Bohr used the concept ‘irrational’, he did so in the sense of ‘an elementary fact’, which cannot be further reduced to any determinable constituents. The quantum of action appears irrational only in relation to the requirements of classical physics…
—Suzanne Gieser, The Innermost Kernel: Depth Psychology and Quantum Physics. Wolfgang Pauli's Dialogue with C.G. Jung
#bohr #irrational #physics
#physics
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jan
…the existence of life must be considered as an elementary fact that cannot be explained, but must be taken as a starting point in biology, in a similar way as the quantum of action, which appears as an irrational element from the point of view of classical mechanical physics, taken together with the existence of elementary particles, forms the foundation of atomic physics. The asserted impossibility of a physical or chemical explanation of the function peculiar to life would in this sense be analogous to the insufficiency of the mechanical analysis for the understanding of the stability of atoms.
—Niels Bohr, ‘Light and Life’, Nature 131 (1933), 458.
#nielsbohr #bohr #life #irrational #physics
#physics
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