Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog

Category: physics – Page 7

Is an in-depth investigation featuring world renowned philosophers and scientists into the most profound philosophical debate of all time: Do we have free will?

Featuring: Sean Carroll, Daniel Dennett, Jerry Coyne, Dan Barker, Heather Berlin, Gregg Caruso, Massimo Pigliucci, Alex O’Conner, Coleman Hughes, Edwin Locke, Robert Kane, Rick Messing, Derk Pereboom, Richard Carrier, Trick Slattery, Dustin Kreuger, Steven Sharper, Donia Abouelatta.

Chapters.

Intro: — 0:00
Chapter 1: What is Free Will? — 4:19
Chapter 2: The Problem of Free Will — 15:29
Interlude: 22:33
Chapter 3: Libertarian Free Will — 23:16
Chapter 4: Compatibilism — 34:47
Chapter 5: Free Will Skepticism — 45:13
Interlude: The 3 Positions of Free Will — 55:45
Chapter 6: The Great Debate — 57:28
Chapter 7: Neuroscience — 1:07:28
Chapter 7: The Interaction Problem — 1:18:37
Chapter 8: Physics — 1:20:10
Chapter 8: Reduction & Emergence — 1:22:14
Chapter 9: Can We Have Determinism and Free Will? — 1:28:57
Chapter 10: Free Will and the Law — 1:45:57
Chapter 11: Should We Stop Using the Term Free Will? — 1:56:37
Outro: 2:00:38

Read more | >

Electronic devices rely on materials whose electrical properties change with temperature, making them less stable in extreme conditions. A discovery by McGill University researchers that challenges conventional wisdom in physics suggests that bismuth, a metal, could serve as the foundation for highly stable electronic components.

The researchers observed a mysterious electrical effect in ultra-thin that remains unchanged across a wide temperature range, from near absolute zero (−273°C) to room temperature.

“If we can harness this, it could become important for green electronics,” said Guillaume Gervais, a professor of physics at McGill and co-author of the study.

Read more | >

Renowned astrophysicist and educator Alex Filippenko joins Brian Greene to discuss an increasingly disturbing cosmological mismatch known as the Hubble Tension, a gap that may require a radical rewriting of the history of the universe.

This program is part of the Big Ideas series, supported by the John Templeton Foundation.

Participant: Alex Filippenko.
Moderator: Brian Greene.

0:00:00 — Introduction.
0:00:50 — Welcome to Alex Filippenko.
0:03:58 — The Most Important Lesson of Science.
0:06:47 — The Hubble Tension.
0:12:04 — Measuring the Expansion Rate of the Universe.
0:23:31 — How far out can we measure?
0:27:10 — Galaxies with Type 1A Supernovae and Cepheids.
0:32:57 — Cosmic Distance Ladder Summary.
0:37:30 — The Universe’s Expansion Rate Today.
0:47:20 — How can we be certain the measurements are correct?
0:51:00 — CMB and using Theoretical Models to Extrapolate the Expansion Rate.
1:00:57 — Positive outcomes to this tension.
1:02:14 — Filippenko’s thoughts on the position of Wendy Freedman’s recent paper.
1:14:09 — Will the Cepheid data set remain at 42?
1:16:55 — Filippenko’s thoughts on the Hubble tension.
1:22:40 — How Cosmology became a precision science.
1:25:11 — Is Inflation a Falsifiable Theory?
1:29:30 — Filippenko’s view of Inflation and the Multiverse.
1:31:08 — Filippenko’s view of Cyclic Inflation and Steinhardt and Penrose’s theories.
1:35:15 — Falsifiable Aspects of Inflation.
1:41:54 — Discovering the Accelerated Expansion of the Universe.
1:47:54 — Filippenko’s thoughts on Saul Perlmutter’s team’s analysis methods.
1:50:47 — Filippenko’s reaction to the initial discovery.
1:59:04 — Thoughts on Dark Energy and the Great Rip.
2:01:58 — Conclusion.
2:03:16 — Credits.

VISIT our Website: http://www.worldsciencefestival.com.
FOLLOW us on Social Media:
Facebook: / worldsciencefestival.
Twitter: / worldscifest.
Instagram: / worldscifest.
TikTok: / worldscifest.
LinkedIn: / world-science-festival.
#worldsciencefestival #briangreene #cosmology #astrophysics #alexfilippenko #bigbang #hubbletension #cosmicinflation #cosmicmicrowavebackground #multiverse #bigrip #darkenergy

Read more | >

Check out a variety of courses on your favorite subjects on Brilliant! First 30 days are free and 20% off the annual premium subscription when you use our link ➜ https://brilliant.org/sabine.

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.

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

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

Point of view invarience.

Talk by James Ladyman (University of Bristol)

Mini-Workshop Website: https://harvardfop.jacobbarandes.com/

YouTube Channel: https://www.youtube.com/channel/UCPRe-yID_EaQwvCZM7hU9Hw.

Harvard foundations of physics workshop series.

Continue reading “James Ladyman — “What is Ontic Structural Realism?”” | >

Physicists from the National University of Singapore (NUS) have synthesized very pure superconducting materials and redefined the critical role of hydrogen in the newly discovered nickel-oxide superconductors.

Their findings were published concurrently in the journals Nature Communications and Physical Review Letters.

Superconductivity is an exciting phenomenon where electrical resistance disappears, and it holds transformative potential for revolutionizing energy technologies. Despite its potential, the origin and fundamental mechanism of remain one of the greatest mysteries in physics.

Read more | >

Observation of temporal reflection and broadband frequency translation at photonic time interfaces https://www.nature.com/articles/s41567-023-01975-y

NEW YORK, March 13, 2023 — When we look in a mirror, we are used to seeing our faces looking back at us. The reflected images are produced by electromagnetic light waves bouncing off of the mirrored surface, creating the common phenomenon called spatial reflection. Similarly, spatial reflections of sound waves form echoes that carry our words back to us in the same order we spoke them.

Scientists have hypothesized for over six decades the possibility of observing a different form of wave reflections, known as temporal, or time, reflections. In contrast to spatial reflections, which arise when light or sound waves hit a boundary such as a mirror or a wall at a specific location in space, time reflections arise when the entire medium in which the wave is traveling suddenly and abruptly changes its properties across all of space. At such an event, a portion of the wave is time reversed, and its frequency is converted to a new frequency.

To date, this phenomenon had never been observed for electromagnetic waves. The fundamental reason for this lack of evidence is that the optical properties of a material cannot be easily changed at a speed and magnitude that induces time reflections. Now, however, in a newly published paper in Nature Physics, researchers at the Advanced Science Research Center at the CUNY Graduate Center (CUNY ASRC) detail a breakthrough experiment in which they were able to observe time reflections of electromagnetic signals in a tailored metamaterial.

Read more | >

“I give you God’s view,” said Toby Cubitt, a physicist turned computer scientist at University College London and part of the vanguard of the current charge into the unknowable, and “you still can’t predict what it’s going to do.”

Eva Miranda, a mathematician at the Polytechnic University of Catalonia (UPC) in Spain, calls undecidability a “next-level chaotic thing.”

Undecidability means that certain questions simply cannot be answered. It’s an unfamiliar message for physicists, but it’s one that mathematicians and computer scientists know well. More than a century ago, they rigorously established that there are mathematical questions that can never be answered, true statements that can never be proved. Now physicists are connecting those unknowable mathematical systems with an increasing number of physical ones and thereby beginning to map out the hard boundary of knowability in their field as well.

Read more | >