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Why time passes is one of the biggest mysteries in physics, as the fundamental laws of nature don’t reflect a difference between moving forward and backward in time. In a new paper, researchers have shown that time might actually be able to run in two directions, meaning we might have a twin universe where time runs opposite our universe’s. Let’s take a look.

Paper: https://www.nature.com/articles/s4159… video comes with a quiz which you can take here: https://quizwithit.com/start_thequiz/.… 🤓 Check out my new quiz app ➜ http://quizwithit.com/ 💌 Support me on Donorbox ➜ https://donorbox.org/swtg 📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 👉 Transcript with links to references on Patreon ➜ / sabine 📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle… 👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl… 🔗 Join this channel to get access to perks ➜ / @sabinehossenfelder 🖼️ On instagram ➜ / sciencewtg #science #sciencenews #physics.

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Continue reading “Time can run in two directions, new research finds” | >

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Physicists have a lot of questions about our universe. Here’s one more to add to the list: Why is it so asymmetrical? New research has confirmed an anomaly named the Hemispherical Power Asymmetry, which states that the cosmic microwave background has more fluctuations in one side of the universe than the other. The weirdest part about this is that no one even has a theory for why this might be the case.

Paper: https://arxiv.org/abs/2411.

This video comes with a quiz which you can take here: https://quizwithit.com/start_thequiz/.… Check out my new quiz app ➜ http://quizwithit.com/ 💌 Support me on Donorbox ➜ https://donorbox.org/swtg 📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 👉 Transcript with links to references on Patreon ➜ / sabine 📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle… 👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl… 🔗 Join this channel to get access to perks ➜ / @sabinehossenfelder 🖼️ On instagram ➜ / sciencewtg #science #sciencenews #physics.

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Continue reading “Our Universe Has Two Different Sides, Physicists Confirm” | >

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Up until last week, physicists believed that matter is made up of only two types of particles: those whose spin has full-integer values (bosons) and those whose spin comes has half-integer values (fermions). But in a new paper, a group of researchers turned the world of physics upside down by mathematically proving that a third type of particles – the “paraparticles” are possible.

Paper: https://www.nature.com/articles/s4158…

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In today’s episode of Theories of Everything, Curt Jaimungal and Julian Barbour challenge conventional physics by exploring Barbour’s revolutionary ideas on time as an emergent property of change, the universe’s increasing order contrary to entropy, and the foundational nature of shape dynamics.

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LINKED MENTIONED:
The Janus Point (Julian Barbour’s book): https://www.amazon.com/Janus-Point-Ne?tag=lifeboatfound-20…
‘Relational Concepts of Space and Time’ (Julian Barbour’s 1982 paper): https://www.jstor.org/stable/687224
‘The Theory of Gravitation’ (Paul Dirac’s 1958 paper): https://www.jstor.org/stable/100497
Carlo Rovelli on TOE: • The Loop Quantum Gravity Debacle: Car…
‘On the Nature of Things’ (book): https://www.hup.harvard.edu/books/978…
Leibniz: Philosophical Writings (book): https://www.amazon.com/Leibniz-Philos?tag=lifeboatfound-20…
Elementary Principles of Statistical Mechanics (book): https://www.amazon.com/Elementary-Pri?tag=lifeboatfound-20…
The interpretations of quantum mechanics in 5 minutes (article): https://curtjaimungal.substack.com/p/.…
Sean Carroll on TOE: • The Crisis in (Fundamental) Physics i…

Timestamps:
00:00 — Introduction.
02:12 — Working Outside of Academia.
03:53 — Space, Time, Dimension.
10:40 — Mach’s Principle.
21:33 — Mach Confused Einstein.
24:22 — Two Particle Universe.
31:46 — Carlo Rovelli.
35:02 — Julian’s Ontology.
43:37 — Julian’s Theory ‘Shape Statistics’
51:11 — Leinbiz’s Philosophical Writings.
56:14 — Expansion of the Universe (Scale Invariance)
01:05:02 — Cosmological Principle.
01:15:34 — Thermodynamics.
01:17:15 — Entropy and Complexity.
01:30:40 — Wave Function / Double Slit Experiment.
01:39:21 — God.
01:44:48 — The Role of Instruments.
01:47:44 — Etymology of Pattern and Matter.
01:51:25 — Join My Substack!

Other Links:

Continue reading “The Physicist Who Says Time Doesn’t Exist” | >

Learn more about artificial intelligence on Brilliant! First 30 days are free and 20% off the annual premium subscription when you use our link ➜ https://brilliant.org/sabine.

Scientific literature is growing rapidly, meaning scientists are increasingly unable to keep up with all of the latest developments in research. AI large language models, though, can read and “digest” information much more quickly than their human counterparts, making them the perfect tools to conduct massive literature reviews. Recent research shows they’re also very accurate at predicting the results of studies that they’ve never read before. Let’s take a look.

Paper: https://www.nature.com/articles/s4156…

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Mathematician Stephen Wolfram has attempted to develop a theory of everything using hypergraphs, which are essentially sets of graphs that can describe space-time. Recently, another mathematician named Jonathan Gorard has used hypergraphs to describe what happens if a black hole accretes matter. He claims that evidence for hypergraphs should be observable in the energy that is emitted during the accretion. Big if true, as they say. Let’s take a look.

Paper: https://arxiv.org/abs/2402.

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Check out courses in science, computer science, or mathematics on Brilliant! First 30 days are free and 20% off the annual premium subscription when you use our link ➜ https://brilliant.org/sabine.

Ten years ago, physicists discovered an anomaly that was dubbed the “ATOMKI anomaly”. The decays of certain atomic nuclei disagreed with our current understanding of physics. Particle physicists assigned the anomaly to a new particle, X17, often described as a fifth force. The anomaly was now tested by a follow-up experiment, but this is only the latest twist in a rather confusing story.

Paper: https://journals.aps.org/prl/abstract…

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A collaboration of a neurologist, a computer scientist, and a philosopher has just put forward a new theory of consciousness. It is based on the idea of causal models. The authors claim boldly that their idea solves the hard problem of consciousness and explains why zombies don’t exist in nature. Really? I’ve had a look.

Paper: https://osf.io/preprints/osf/mtgn7

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I have my own introduction quantum mechanics course that you can check out on Brilliant! First 30 days are free and 20% off the annual premium subscription when you use our link ➜ https://brilliant.org/sabine.

Physicists are obsessed with black holes, but we still don’t know what’s going on inside of them. One idea is that black holes do not truly exist, but instead they are big quantum objects that have been called fuzzballs or frozen stars. This idea has a big problem. Let’s take a look.

This video comes with a quiz which you can take here: https://quizwithit.com/start_thequiz/.…

Paper: https://journals.aps.org/prd/abstract…

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Continue reading “These physicists say they know what’s inside a black hole” | >

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I got a bunch of requests to comment on a new attempt at a theory of everything that supposedly combines quantum physics with general relativity. I had a look, and this is a quick comment. First reaction, basically. Didn’t get far in the paper, as you will see. I am sorry in case I appear unkind, but this kind of stuff really pisses me off.

The paper is here: https://www.sciencedirect.com/science…

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