• Special Relativity - Which reference frame experiences which time?

    Updated: 2023-03-31 18:36:10
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  • Twin Paradox -- One twin stays on Earth, and the other travels 10 years at 0.87c

    Updated: 2023-03-31 16:49:47
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  • Black Hole Information path described in new article

    Updated: 2023-03-31 13:58:01
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  • Scientists observe flattest explosion ever seen in space

    Updated: 2023-03-31 13:27:27
    Skip to content Menu Our Bloggers Twitter Google News Substack FaceBook Contribute Contact Search Scientists observe flattest explosion ever seen in space March 31, 2023 University of Sheffield An explosion the size of our solar system has baffled scientists , as part of its shape similar to that of an extremely flat disc challenges everything we know about explosions in . space The explosion observed was a bright Fast Blue Optical Transient FBOT an extremely rare class of explosion which is much less common than other explosions , such as supernovas . The first bright FBOT was discovered in 2018 and given the nickname “the . cow” Explosions of stars in the universe are almost always spherical in shape , as the stars themselves are spherical . However , this explosion , which occurred

  • Question about Weinberg Book QFT1 (5.1.13)

    Updated: 2023-03-31 10:06:14
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  • Where did the first universe come from?

    Updated: 2023-03-31 09:49:31
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  • Worldlines and curves in spacetime

    Updated: 2023-03-31 01:28:17
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  • Regarding fibrations between smooth manifolds

    Updated: 2023-03-31 01:28:16
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  • Ancient Graffiti Revealed in 3D Detail

    Updated: 2023-03-30 19:31:04
    Skip to content Menu Our Bloggers Twitter Google News Substack FaceBook Contribute Contact Search Ancient Graffiti Revealed in 3D Detail March 30, 2023 Simon Fraser University SFU geography professor Nick Hedley . Photo Credit : Simon Fraser University Simon Fraser University researchers are learning more about ancient graffiti—and their intriguing comparisons to modern graffiti—as they produce a state-of-the-art 3D recording of the Temple of Isis in Philae , . Egypt Working with the University of Ottawa , the researchers published their early findings in  Egyptian Archaeology  and have returned to Philae to advance the . project “It’s fascinating because there are similarities with today’s graffiti,” says SFU geography professor Nick Hedley , co-investigator of the Social

  • How to multiply matrix with row vector?

    Updated: 2023-03-30 19:24:46
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  • Boosting the body’s anti-viral immune response may eliminate aging cells

    Updated: 2023-03-30 19:23:41
    Skip to content Menu Our Bloggers Twitter Google News Substack FaceBook Contribute Contact Search Boosting the body†s anti-viral immune response may eliminate aging cells March 30, 2023 Massachusetts General Hospital Aging , or senescent cells , which stop dividing but don†t die , can accumulate in the body over the years and fuel chronic inflammation that contributes to conditions such as cancer and degenerative . disorders In mice , eliminating senescent cells from aging tissues can restore tissue balance and lead to an increased healthy lifespan . Now a team led by investigators at Massachusetts General Hospital MGH a founding member of Mass General Brigham MGB has found that the immune response to a virus that is ubiquitously present in human tissues can detect and eliminate

  • Neural networks in Wolfram Mathematica

    Updated: 2023-03-30 08:09:49
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  • Exoplanet TOI-4603 b, ~13x Jupiter mass, ~1.04 Jupiter diameter

    Updated: 2023-03-30 08:09:47
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  • Experiment finds gluon mass in the proton (?)

    Updated: 2023-03-30 00:39:21
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  • Combination of 2 formulas for a graph

    Updated: 2023-03-29 21:04:21
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  • Ballentine Equation 5.13 on conservation of momentum

    Updated: 2023-03-29 21:04:19
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  • Gamma-Ray Burst GRB221009A

    Updated: 2023-03-29 21:04:16
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  • Thoughts about coupled harmonic oscillator system

    Updated: 2023-03-29 19:23:48
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  • How to find the eigenvector for a perturbated Hamiltonian?

    Updated: 2023-03-29 18:46:42
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  • Varying an action wrt a symmetric and traceless tensor

    Updated: 2023-03-29 18:35:40
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  • vacuum in tanks similiar torricellian vacuum

    Updated: 2023-03-29 17:19:04
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  • Ultramassive Black Hole (UMB), 30 billion solar masses?!

    Updated: 2023-03-29 16:39:08
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  • You can find the flow – and scientists can measure it

    Updated: 2023-03-29 14:38:33
    Skip to content Menu Our Bloggers Twitter Google News Substack FaceBook Contribute Contact Search You can find the flow – and scientists can measure it March 29, 2023 Norwegian University of Science and Technology You know when you†ve found the flow . You experience it when you are doing something that engages you so fully that time seems to fly by . Maybe it’s a job , or something completely different , like chess or computer games or football or shovelling . snow But flow is not just an expression that people use . It has been a concept used by psychologists for almost 50 years , because finding the flow can be useful for . people “Finding the flow zone can be important when teachers have to adapt their instruction . If we find the flow , we†ve also found the right level for the

  • ODE with non-exact solution: closed-form, non-iterative approximations

    Updated: 2023-03-29 12:09:25
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  • Dark energy density proportion

    Updated: 2023-03-29 03:11:19
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  • Is the light from Andromeda truly blue shifted?

    Updated: 2023-03-29 03:11:18
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  • Time dilation for a clock thrown vertically

    Updated: 2023-03-29 03:11:17
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  • How can the Schwarzschild solution be solved in a spherical space with a constant radius and constant time?

    Updated: 2023-03-28 09:47:20
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  • Tentative Connection between FRB and Gravitational Wave event

    Updated: 2023-03-28 01:08:58
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  • Von Neumann's uniqueness theorem (CCR representations)

    Updated: 2023-03-26 22:25:44
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  • Is There a Multiverse? Great Mysteries of Physics Part 3 (March 25, 2023 podcast)

    Updated: 2023-03-25 00:00:00
    Miriam Frankel explores the multiverse with physicists Andrew Pontzen, Katie Mack and Sabine Hossenfelder, in FQxI's podcast series produced by The Conversation. The Many Worlds interpretation of quantum mechanics posits one type multiverse of parallel universes, while some cosmological models suggest others. But is the idea of a multiverse even scientific? Miriam discusses attempts to find evidence of neighbouring universes in the relic radiation of the big bang–and also the criticism that ultimately the idea of a multiverse is not testable and thus not scientific. And could we even make a universe in the lab?

  • Photon dilemma for MOND-like dark matter

    Updated: 2023-03-23 11:44:23
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  • Direct and reverse current

    Updated: 2023-03-22 18:04:18
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  • Quantum entanglement and hidden variables

    Updated: 2023-03-21 06:38:18
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  • Solving for the Nth divergence in any coordinate system

    Updated: 2023-03-19 09:48:18
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  • Interpretation of temperature in liquids/solids

    Updated: 2023-03-19 00:14:26
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  • Question on the Lorentz force: Why is the force not F=q(v×B) = F=qv×qB

    Updated: 2023-03-19 00:14:23
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  • Does the magnetic field of a moving particle depend on the particle's spin value?

    Updated: 2023-03-17 21:03:22
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  • What do these wavenumbers correspond to in Raman spectroscopy?

    Updated: 2023-03-16 00:11:31
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  • Does an electron have a quantum phase frequency?

    Updated: 2023-03-13 19:42:03
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  • Lost in the Landscape

    Updated: 2023-03-03 18:17:22
    A commenter in the previous posting pointed to an interview with Lenny Susskind that just appeared at the CERN Courier, under the title Lost in the Landscape. Some things I found noteworthy: He deals with the lack of any current … Continue reading →

  • Physics With Witten

    Updated: 2023-02-26 16:10:43
    I just noticed that last semester Edward Witten was teaching Physics 539 at Princeton, a graduate topics course. Since he’s now past the age of 70, at the IAS he is officially retired and an emeritus professor (the IAS is … Continue reading →

  • Some Interviews

    Updated: 2023-02-23 18:11:31
    Some interviews that readers of this blog may find of interest: David Zierler at the AIP interviews Lee Smolin (April 1, 2021). David Zierler at the AIP interviews Stephon Alexander (June 7, 2021). Alexis Papazoglou at IAI News interviews me … Continue reading →

  • The Trouble With Path Integrals, Part II

    Updated: 2023-02-16 23:48:40
    This posting is about the problems with the idea that you can simply formulate quantum mechanical systems by picking a configuration space, an action functional S on paths in this space, and evaluating path integrals of the form $$\int_{\text{paths}}e^{iS[\text{path}]}$$ Necessity … Continue reading →

  • The Trouble With Path Integrals, Part I

    Updated: 2023-02-16 23:47:39
    Two things recently made me think I should write something about path integrals: Quanta magazine has a new article out entitled How Our Reality May Be a Sum of All Possible Realities and Tony Zee has a new book out, … Continue reading →

  • What’s Going Right in Particle Physics

    Updated: 2023-02-15 01:22:20
    Since I had a little free time today, I was thinking of writing something motivated by two things I saw today, Sabine Hossenfelder’s What’s Going Wrong in Particle Physics, and this summer’s upcoming SUSY 2023 conference and pre-SUSY 2023 school. … Continue reading →

  • STEM Bibles List

    Updated: 2023-02-10 13:10:49
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