Hello, Professor Carroll. Sean Carroll, an acclaimed theoretical physicist, is determined to reintroduce this vital science to a new generation. "[9] In 2015 he was awarded a Guggenheim Fellowship. This is a question about changes in the rate of time & a potential ‘further’ test of General Relativity. The article generated significant attention when it was discussed on The Huffington Post. It is a great teaching. Aug 30, 2020. Alex Rosenberg, Robin Collins, Tim Maudlin and James Sinclair also participated in the event, on the second day of the event, after the debate. Any gravitational-interaction-trajectory is truly an _inertial trajectory_. The topic of debate was "The Existence of God in Light of Contemporary Cosmology." “The more you move in space, the less you move in time”… I think this is a key concept that I’m failing to grasp. And here is the associated Q&A video. Finally, and this is neither here nor there, and as a physicist maybe you don’t care, but as I presume you value naturalness and elegance I wonder if you take a position on the pi vs. tau issue? My research involves theoretical physics and astrophysics, especially cosmology, field theory, and gravitation. Awful things did happen in the Big Bang. P.S. Recently he started focusing on issues at the foundations of cosmology, statistical mechanics, quantum mechanics, and complexity. Sean Carroll is a Research Professor of theoretical physics at the California Institute of Technology and External Professor at the Santa Fe Institute. He received his Ph.D. in 1993 from Harvard University. With over 1,900 citations, it helped pioneer the study of f(R) gravity in cosmology.[12]. Already hailed as a masterpiece, Something Deeply Hidden shows for the first time that facing up to the essential puzzle of quantum mechanics utterly transforms how we think about space and time. You are correct. Before the debate stated s/he is not worried about Carroll. This one’s sure to be a crowd-pleaser. But I think that it is actually not fully satisfied in GR, because the metric itself is a „thing“, relative to which we can e.g. Albert Einstein’s theory of general relativity describes gravity as a geometric property of space and time. $0.00 Free with Audible trial #11. 4.6 out of 5 stars 1,365. I remember waiting, back in 2004, for the publication of his textbook (Spacetime and Geometry) on … How is this reconciled with time symmetry? CS1 maint: bot: original URL status unknown (, Walter Burke Institute for Theoretical Physics, The Blackwell Companion to Science and Christianity, From Eternity to Here: The Quest for the Ultimate Theory of Time, The Particle at the End of the Universe: How the Hunt for the Higgs Boson Leads Us to the Edge of a New World, The Big Picture: On the Origins of Life, Meaning, and the Universe Itself, Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime, "Caltech Walter Burke Institute for Theoretical Physics Faculty Page", "How To Get Tenure at a Major Research University | Cosmic Variance | Discover Magazine", "Sean Carroll Awarded Guggenheim Fellowship", "Sean Carroll Talks School Science and Time Travel", "Spontaneous Inflation and the Origin of the Arrow of Time", "3 Theories That Might Blow Up the Big Bang", "Science and Religion Can't Be Reconciled: Why I won't take money from the Templeton Foundation", "Alan Wallace and Sean Carroll on The Nature of Reality", "Science & God: Will Biology, Astronomy, Physics Rule Out Existence Of Deity? What do you think may happen there? If a large mass falls into a black hole, is it done affecting the gravitational field around the black hole once it crosses the event horizon? So, then, what are GUTs unifying exactly, just those alpha constants? Gravity! Why, for example, does the electromagnetic force need the photon as a force carrier rather than just the result of the curvature of the field? Now for some confusions. Yikes! Could that be interpreted as if the object is just following the path of least action because the space is more streched (less dense) in the direction pointing to the center of planet then in the opposite direction? Carroll has also worked on the arrow of time problem. The GR experiment incurs a difference in both speed (centripetal) & centrifugal force for the raised clock as well as a difference in gravity. His debate against William Lane Craig was much anticipated and met with huge interest, as many expressed views before and after the debate. By Sean Carroll. Brett Ryder. [23] Both Craig and Carroll had talked on each other before the debate. Wrt to #16, the connection between small regions of spacetime and the infinitesimals of calculus was especially illuminating. If the Poincarre group is the gauge group, why do we not have 10 spin-1 gauge bosons? I extended that to include: nor does gravity. For those who might want to dig into Einstein’s GR journey and thinking (he first produced a theory that had real problems, for instance) from historical research: “The Genesis and Transformations of General Relativity” by Jürgen Renn, Director, Max Planck Institute for the History of Science. The Biggest Ideas in the Universe | 16. Already hailed as a masterpiece, Something Deeply Hidden shows for the first time that facing up to the essential puzzle of quantum mechanics utterly transforms how we think about space and time. Perhaps everyone else got it. His latest book is The Particle at the End of the Universe: How the Higgs Boson Leads us to the Edge of a New World. Is it true that Gravitational potential energy is not defined in GR? Finally, in an expanding universe, that matrix term turns positive +1…. When you're designing a scene, using pre-existing 3D models can save time. I agree, and would be interested in hearing your response to a question about other “forces”. In his first preview Barnes wrote that the choice of debaters were good. but if gravity is so very weak compared to the forces at work in QM, then aren’t its effects negligible on that scale? He began a podcast in 2018 called Mindscape, in which he interviews other experts and intellectuals coming from a variety of disciplines, including "[s]cience, society, philosophy, culture, arts, and ideas" in general.[5]. Does the GRW approach best adapt GR (because it’s a “gravitational collapse” model?) [7] He is now a research professor at Caltech. 4.3 out of 5 stars 114. In every presentation of GR (except yours), a central place is given to the the concept of equivalence of inertial mass and gravitational mass. You’ve said the singularity doesn’t have a point in space, but it seems like you could attribute a point in spacetime to where a particular in falling particle hits the singularity? Time, The Biggest Ideas in the Universe | 8. "[21], In 2014, Carroll debated with philosopher and Christian apologist William Lane Craig as part of the Greer-Heard Forum in New Orleans. Is the gravity just the effect of the (localy) weakened higgs field? ... On the other hand, remember, gravity doesn’t fit into quantum field theory. LET’S say you want to meet a friend for coffee. Would it be wrong to use the term “streched” instead of “curved” for space? – Carroll vs Craig Review (Part 1)", "Carroll's five replies to the fine-tuning argument: Number 1", https://www.preposterousuniverse.com/blog/2011/04/05/debating-william-lane-craig/comment-page-2/, "Open thread for January 1-7, 2014 - LessWrong", "Thoughts on the Carroll-Craig Debate » Undivided Looking", "The Shelly Kagan debate on moral theory & the Sean Carroll debate on cosmology are William Lane Craig's two biggest losses", "2014 National Convention - Los Angeles - Freedom From Religion Foundation", "Royal Society Winton Prize for Science Books", Dark Matter, Dark Energy: The Dark Side of the Universe, Video introduction to Sean Carroll's lectures "The Biggest Ideas in the Universe", https://en.wikipedia.org/w/index.php?title=Sean_M._Carroll&oldid=1007744527, California Institute of Technology faculty, 21st-century American non-fiction writers, MIT Center for Theoretical Physics alumni, CS1 maint: bot: original URL status unknown, Wikipedia articles with CANTIC identifiers, Wikipedia articles with PLWABN identifiers, Wikipedia articles with SELIBR identifiers, Wikipedia articles with SUDOC identifiers, Wikipedia articles with WORLDCATID identifiers, Creative Commons Attribution-ShareAlike License. It is also our friend. In this video, and in recent ones, you referred to how the designation of “forces” is really just a vernacular shorthand and that the deeper you go into studying physics the less meaningful the term “force” becomes, that quantum specialists in particular talk in terms of fields, not forces. So, because it (higgs field) has distributed much of its local energy to slow massive particles, the rate at which it is slowing them down gets lower localy, making the space “less dense” the more we get to center of mass, giving arise to an effect which we call curvature of space – gravity? The Biggest Ideas in the Universe | 6. By isolating the variable of gravity from the variables of centripetal speed/centrifugal force & testing a difference in gravity ONLY* –. I have a few questions which may or may not be pertinent to the forthcoming gravity q & a as I’m only now catching up in the series. I opened the transcript and I searched for the word ‘inertial’. For SR NIST gyrated the comparison clock to obtain relative speeds. The motion of the object with respect to the Ehrenfest disk is accelerated motion. His article "Does the Universe Need God?" Video of Sean Carroll's panel discussion, "Quantum to Cosmos," answering the biggest questions in physics today, This page was last edited on 19 February 2021, at 18:28. I really enjoyed the Schwarzschild explanations. Entanglement, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Click to email this to a friend (Opens in new window), Energy Conservation and Non-Conservation in Quantum Mechanics, The Biggest Ideas in the Universe | 24. [4] He is also the author of four popular books: From Eternity to Here about the arrow of time, The Particle at the End of the Universe about the Higgs boson, The Big Picture: On the Origins of Life, Meaning, and the Universe Itself about ontology, and Something Deeply Hidden about the foundations of quantum mechanics. In 2012 he organized the workshop "Moving Naturalism Forward", which brought together scientists and philosophers to discuss issues associated with a naturalistic worldview. Sorry, your blog cannot share posts by email. He has also worked on the foundations of quantum mechanics, especially the Many-Worlds interpretation, including a derivation of the Born Rule for probabilities. Theoretical physicist, writer and talker. Spacetime and Geometry: An Introduction to General Relativity - Kindle edition by Carroll, Sean M.. Download it once and read it on your Kindle device, PC, phones or tablets. That sounds counterintuitive to me. Blurbs. Is the term “small” dependent on how strong the gravitational field is? So I ask….. And is there any useful discussion/explanation for the mismatch of the QM prediction for Lambda and the currently measured values? They assert that the universe is "statistically time-symmetric," insofar as it contains equal progressions of time "both forward and backward". That would be fantastic. They claim that the universe is infinitely old but never reaches thermodynamic equilibrium as entropy increases continuously without limit due to the decreasing matter and energy density attributable to recurrent cosmic inflation. 1. Where would the graviton go on the table of particles, or would it even? I’m your host, Sean Carroll. 1:24:48 can you explain why the bending of light is two times larger when calculating with GR compared to Newton Gravity? Since gravity waves propagate at the speed of light, does that mean they also cannot escape a black hole? [34] Dr. Richard Carrier, a historian and a philosopher whose works focus on the historicity of Jesus, atheism and empiricism, referenced this debate as one of Craig's biggest two losses. [13][14][15] Some of his work has been on violations of fundamental symmetries, the physics of dark energy, modifications of general relativity, and the arrow of time. "[32][33] Theoretical physicist Dr. Aron Wall also wrote a debate review. Any chance you could talk a bit more about singularities? He is a research professor in the Department of Physics at the California Institute of Technology and Research Professor at the Santa Fe Institute. In 2010 NIST reported on their ground based precision clock Relativity tests comparing clocks at differing relative speeds (SR) & comparing clocks placed at differing positions within the gravity potential (GR). Authors: Sean M. Carroll, Grant N. Remmen. I knew I should have gone to Cal Tech rather than MIT. I very much appreciate you walking through the concepts and related equations. His research papers include models of, and experimental constraints on, violations of Lorentz invariance; the appearance of closed timelike curves in general relativity; varieties of topological defects in field theory; and cosmological dynamics of extra spacetime dimensions. Tree removal may take a nap—in the heat of the afternoon… Gravity is, of course an important matter. You briefly mentioned Kruskal coordinates that are well-behaved on the complete manifold near a black hole and thus prevent awfull things from happening. Carroll has worked on a number of areas of theoretical cosmology, field theory and gravitation theory. Suppose I understood that correctly. There was a remark, attributed to Neil Young: rust never sleeps. Authors: Sean M. Carroll, Timothy R. Dulaney, Moira I. Gresham, Heywood Tam Comments: 23 pages, 1 figure; in v2: added references and made minor minor changes to text in sections I and VI; in v3 (version accepted by PRD): added references and made minor changes to discussion in section III https://arxiv.org/abs/1501.00996 ). Re: the Einstein-Hilbert action, since it is a Lagrangian, it should be Kinetic Energy – Potential Energy. Carroll believes that many of his fellow physicists need to acknowledge gaps in the understanding of quantum mechanics—which seems … I have not been able to find any evidence of a clock comparison experiment conducted ‘anywhere’ that holds speed & centrifugal force equal for both clocks & ONLY a difference in gravity occurs. What is the significance of that? Have a Seat. About the 22 minute point, you comment that gravity is not really a force it is a feature of the curvature of spacetime. There was a remark, attributed to Neil Young: rust never sleeps. You didn’t discuss gravitons, but in previous videos you seemed to say that quantum physicists act as if they are real just not yet confirmed. Hello, Professor Carroll. [35] A book has been published containing the transcript of the debate and the following Questions and Answers session on the second day of the event. 2. [19] In newtonian mechanics that equivalence is a necessary supposition in order to have a theory of planetary motion at all. Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime By Sean Carroll. Read on to learn the best sites to get furniture 3D models! Could you please explain gravity as a gauge theory in more detail. Why do things fall „downwards“ and not „upwards“ and what has time diletation to do with it? Sean Carroll: Purpose and the Universe (keynote speaker) American Humanist Association. (2003) was written with Vikram Duvvuri, Mark Trodden, and Michael Turner. in The Blackwell Companion to Science and Christianity develops the claim that science no longer needs to posit a divine being to explain the existence of the universe. The SR experiment incurs a difference in centrifugal force for the gyrated clock as well as difference in speed. How can we be sure this isn’t just a consequence of a bad choice of coordinates? Carroll, while raised as an Episcopalian,[17] is an atheist, or as he calls it, a "poetic naturalist". 1. [2] He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as Nature as well as other publications, including The New York Times, Sky & Telescope, and New Scientist. I have read that GR predicts the existence of the graviton. His most-cited work, "Is Cosmic Speed-Up Due To New Gravitational Physics?" You said the equivalence principle is correct over small distances of space-time. It is also our friend. (sample questions: Does an infalling object have a future beyond the moment it hits the singularity? His research ranges over a number of topics in theoretical physics, focusing on cosmology, field theory, and gravitation. Gravity is easier than QM. For GR NIST raised the comparison clock 1 metre higher to obtain differing positions within the gravity potential  I noticed something you _don’t mention_, very, very much to my surprise. Then why was the Higgs regarded as the final missing piece of the standard model? His reconciling of quantum mechanics with Einstein’s theory of relativity … 4. Sean Carroll’s new book argues quantum physics leads to many worlds ... Galileo’s famous gravity experiment holds up, even with individual atoms By Emily Conover October 28, 2020. We take advantage of some of our previous discussion of curvature and spacetime, but we also talk about Einstein’s physical motivations for inventing general relativity, and the origin of gravitational time dilation and the like. (I very much enjoyed the Schwartzschild explanations.) Construct a space station that is large enough and with such an angular velocity that inhabitants of that Ehrenfest disk at a particular distance ‘r’ to the axis of rotation experience 1 G of centripetal acceleration. One thing I’d like to understand better about GR is its relation to Mach‘s principle, which states that there is no absolute motion, so in particular the effect of rotation on an object (which we can measure as a centrifugal force) would only exist because the object is rotating relative to other objects (like the earth, or distant galaxies). (There might be partial effects due to frame dragging, but I suspect they would still be different.) The event horizon seems like an exception to this, because it is possible for things to take a trajectory where they cross the event horizon going into the black hole, but if you reverse the trajectory it is impossible to cross the event horizon from inside. He has appeared on the History Channel's The Universe, Science Channel's Through the Wormhole with Morgan Freeman, Closer to Truth (broadcast on PBS),[3] and Comedy Central's The Colbert Report. Topics include manifolds, Riemannian geometry, Einstein's equations, and three applications: gravitational radiation, … Hello, I have somewhat connected questions (i appoligize if they are nonsensical): 1. 12 June 2013. ", "Sean Carroll to debate William Lane Craig", "Sean Carroll vs William Lane Craig: A Preview", "Carroll vs. Craig (2): How to Debate WLC", "Did the Universe Have a Beginning? Q: Would a clock comparison experiment that measures ONLY a difference in gravity be a ‘further’ test of General Relativity? Any further discussion of the relation between the two would be helpful. 5. These NIST Relativity tests prove beyond any doubt that a clock moving at greater velocity ticks slower & that a clock ticks faster higher up within a gravity potential – BUT has it been experimentally proven that time ticks slower in the greater gravity field? According to Einstein’s relativity, a black hole is a region of space-time where gravity has become so strong that … My current interests include quantum mechanics, gravitation, cosmology, statistical mechanics, and foundations of … He worked as a postdoctoral researcher at the Massachusetts Institute of Technology (MIT) and Kavli Institute for Theoretical Physics at the University of California, Santa Barbara[6] and as an assistant professor at the University of Chicago until 2006 when he was denied tenure. ", "Science/Religion Debate Live-Streaming Today : Cosmic Variance. Carroll enlisted Alan Guth, the G in BGV theorem, for help in this elaborate ruse. If quantum fields are considered fundamental why can the other “forces” not be considered as due to curvature (or whatever term is appropriate) of the corresponding quantum field? Sean Carroll is a physicist and author. Is there any way to say ‘where’ the singularity is in space? ) Excellent talk. How you present these very fascinating and very difficult topics in physics is a usefully different supplement to what else is out there. I think Einstein himself was a big fan of this idea, and even used it as a guiding principle to find GR. I see you using pi without comment, but maybe that’s just by convention, not wanting to add needless complication in an explanatory setting? ... modified gravity, topological defects, extra dimensions, and violations of fundamental symmetries. etc. I assume that “small” means a different thing near a black hole than it does if you’re floating in the void between galaxy clusters? Related (I think) is when you say ” As Minkowski taught us, Tau^2 = t^2 – x^2″ where Tau is the “time elapsed. 2. Download PDF Abstract: We investigate theories in which gravity arises as a consequence of entropy. Sean Carroll, theoretical physicist and one of this world’s most celebrated writers on science, rewrites the history of 20th century physics. I guess all bets are off at that point? Such a clear presentation. Acces PDF Sean Carroll General Relativity Solutions Lecture Notes on General Relativity – Sean Carroll A complete education in general relativity cannot exclude this important subject, and now we have a textbook that presents it in a clear, accessible way. They seem like one of the wackiest and most interesting things in physics, but it’s also hard to know how to think about them correctly. Sean Carroll is a member of All3DP’s Content Academy and contributing writer for All3DP.com. At least one very good thing has come from the present difficulties. Spacetime, The Biggest Ideas in the Universe | 5. Sean M. Carroll These notes represent approximately one semester's worth of lectures on introductory general relativity for beginning graduate students in physics. Minkowski spacetime). In 2017 Carroll presented an argument for rejecting certain cosmological models, including those with Boltzmann brains, on the basis that they are cognitively unstable: they cannot simultaneously be true and justifiably believed. Is there an intuitive understanding why space-time curvature can also be understood in terms of gravitons? You mention ‘inertial trajectory’ once in your presentation, and never again. I have worked on questions involving dark matter and dark energy, modified gravity, violations of Lorentz invariance, extra dimensions, topological defects, cosmic microwave background anisotropies, causality violation, black holes, and the cosmological constant problem. Distinguished mostly by a deeper dive into black holes, including the information-loss puzzle. Looking at the NIST 2010 experiments: Any other discussion would help. My research goal is to obtain a better understanding of how Nature works, on various levels and in a number of different contexts. I have enjoyed your books for several years—especially The Big Picture. Sean Carroll – Preposterous Universe I'm interested in how the world works at the deepest levels, which leads me to do research in physics and philosophy. By Sean Carroll. Sean Carroll is a Research Professor of Physics at Caltech and the Santa Fe Institute. Post was not sent - check your email addresses! Quantum Space: Loop Quantum Gravity and the Search for the Structure of Space, Time, and the Universe Jim Baggott. Of course, the whole thrust of your presentation is that objects subject only to gravitational interaction move along a _geodesic_ of GR spacetime. Where is the connection field that predicts the graviton? I know that you have recently become more interested in statistical mechanics aspects of physics. I’m assuming you will do a video on Quantum Gravity? Audible Audiobook. Could you do something similar for FRIEDMANN (open, closed, flat spacetime) and the expanding universe ? This is a very brief overview of how I think about what I'm doing; for more details see my annotated list of publications, or just skip to my CV.. For most of my career, my focus has been on the intersection of cosmology, gravitation, and field theory. Also, about geodesics, could you clarify what you meant by “longest time path”? [22] Dr. Luke Barnes, a postdoctoral cosmology researcher at Western Sydney University, has written 2 pre-views before the debate[23][24] and a review[25][26][27] and rebuttals[28][29] to Carroll's in-debate arguements after the debate was over. Go to a shaft, and release an object. I have enjoyed your books for several years—especially The Big Picture. You know that once released the object will continue along an inertial trajectory. Criticality and Complexity, How to Make Educational Videos with a Tablet, The Biggest Ideas in the Universe | 22. Carroll occasionally takes part in formal debates or discussions with theists. Furniture 3D Models: 10 Great Sources in 2020. He is a research professor in the Walter Burke Institute for Theoretical Physics in the California Institute of Technology Department of Physics and an External Professor at the Santa Fe Institute. Logical implication: equivalence of inertial and gravitational mass. Also, I don’t think (but am not sure) that setting a distant matter distribution into rotating motion would at some later point lead to the same centrifugal force for a test object at the origin that would be identical to the one you would measure if only the object was rotating, but not the distant masses. He turned down an invitation to speak at a conference sponsored by the John Templeton Foundation, because he did not want to appear to be supporting a reconciliation between science and religion;[18] however, he later took part in a discussion with Buddhist scholar B. Alan Wallace organized by an institution sponsored by the same foundation. He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as Nature as well as other publications, … *(by utilising NIST portable clocks at differing locations of same longitude & height above sea level to equalise centripetal speed/centrifugal force, but of differing geological density – or via placing clocks at existing grav.wave detectors – or via these similarly oriented proposals: Theorists are looking for the way to quantize gravity in order to understand its effects on the tiny scales that QM deals with (aren’t they?) Field. Thank you Dr. Carroll for this quarantine largesse. In 2012, he teamed up with Michael Shermer to debate with Ian Hutchinson of MIT and author Dinesh D'Souza at Caltech in an event titled "The Great Debate: Has Science Refuted Religion? https://arxiv.org/abs/1506.02853 He received his Ph.D. from Harvard in 1993, and is now on the faculty at the California Institute of Technology, where … 0:00:00 Sean Carroll: Hello everyone, and welcome to the Mindscape Podcast.
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