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Stanford Institute for Theoretical Physics
Добавлен 7 окт 2014
The Stanford Institute for Theoretical Physics (SITP) is a research institute comprising 16 faculty in Physics and related fields, and approximately 100 graduate students, post-doctoral scholars, and visitors. SITP is an institute within the Stanford University Department of Physics.
Following in the tradition of Albert Einstein, Niels Bohr, and Richard Feynman, the goals of SITP are to uncover the basic physical principles governing the world of natural phenomena. Broadly speaking these phenomena range over the cosmological origins of the universe, the properties of elementary particles, the emergence of space and time out of quantum bits of information, and the amazingly emergent properties of atoms when they are combined into macroscopic materials.
Following in the tradition of Albert Einstein, Niels Bohr, and Richard Feynman, the goals of SITP are to uncover the basic physical principles governing the world of natural phenomena. Broadly speaking these phenomena range over the cosmological origins of the universe, the properties of elementary particles, the emergence of space and time out of quantum bits of information, and the amazingly emergent properties of atoms when they are combined into macroscopic materials.
Oren Slone | A Path to Detecting Self-Interacting Dark Matter using Astrophysical Sub-Structure
Speaker: Oren Slone
Date: Friday, November 18, 2022
Affiliation: SLAC
Title: A Path to Detecting Self-Interacting Dark Matter using Astrophysical Sub-Structure
Abstract:Dark matter self interactions can leave distinctive signatures on the properties of satellite galaxies around Milky Way-like hosts. By analyzing a number of Milky Way dwarf galaxies, we were able to place new constraints on models of self-interacting dark matter which interact via a Yukawa potential. The results push the theory into a parameter space with a very specific prediction: self-interactions within satellite galaxies can be either very large (so large that new dynamical effects become important), or very small (so sma...
Date: Friday, November 18, 2022
Affiliation: SLAC
Title: A Path to Detecting Self-Interacting Dark Matter using Astrophysical Sub-Structure
Abstract:Dark matter self interactions can leave distinctive signatures on the properties of satellite galaxies around Milky Way-like hosts. By analyzing a number of Milky Way dwarf galaxies, we were able to place new constraints on models of self-interacting dark matter which interact via a Yukawa potential. The results push the theory into a parameter space with a very specific prediction: self-interactions within satellite galaxies can be either very large (so large that new dynamical effects become important), or very small (so sma...
Просмотров: 1 575
Видео
Daniel Jafferis | JT gravity with propagating matter, and the ETH as a matrix model
Просмотров 1,3 тыс.2 года назад
Speaker: Daniel Jafferis Date: Monday, June 6, 2022 Affiliation: Harvard University Title: JT gravity with propagating matter, and the ETH as a matrix model Abstract: The Eigenstate Thermalization Hypothesis is an ansatz for the matrix elements of light operators between heavy microstates. I will describe how it can be expressed as a single trace multi-matrix model for the light operators and t...
Natalie Paquette | New thoughts on old gauge amplitudes
Просмотров 9992 года назад
Speaker: Natalie Paquette Date: Monday, May 23, 2022 Affiliation: University of Washington Title: New thoughts on old gauge amplitudes Abstract: I will discuss recent work in collaboration with Kevin Costello. We propose a new formula for computing form factors of a four-dimensional theory, which in turn are related to certain scattering amplitudes of gluons in QCD. These formulas are given in ...
Maya Fishbach | Astrophysics and Cosmology with Black Hole Mergers
Просмотров 1,3 тыс.2 года назад
Speaker: Maya Fishbach Date: Monday, May 9, 2022 Affiliation: Northwestern University Title: Astrophysics and Cosmology with Black Hole Mergers Abstract: LIGO and Virgo have observed over 70 gravitational-wave sources to date, including mergers between black holes, neutron stars, and mixed neutron star- black holes. The origin of these merging neutron stars and black holes the most extreme obje...
Daniel Greene | A dS EFT
Просмотров 1,4 тыс.2 года назад
Speaker: Daniel Greene Date: Monday, May 2, 2022 Affiliation: UC San Diego Title: A dS EFT Abstract: The history of perturbative calculations in de Sitter space is littered with confusing and often contradictory results. The challenge is primarily the technical difficulty in performing loop calculations in de Sitter but the implications are relevant to the observational consequences of inflatio...
Dam Thanh Son | Bosonization of Fermi Surfaces and Coadjoint Orbits
Просмотров 1,5 тыс.2 года назад
Speaker: Dam Thanh Son Date: Monday, April 11, 2022 Affiliation: University of Chicago Title: Bosonization of Fermi Surfaces and Coadjoint Orbits Abstract: Fermi liquid theory is a cornerstone of condensed matter physics. However, Landau's formulation of Fermi liquid theory does not fit into the paradigm of effective field theory. We describe a new method that leads to a field-theoretical refor...
Marco Cirelli | Dark Matter Indirect Searches as of 2022
Просмотров 1,6 тыс.2 года назад
Speaker: Marco Cirelli Date: Monday, March 28, 2022 Affiliation: LPTHE Paris Title: Dark Matter Indirect Searches as of 2022 Abstract: I will introduce the basic principles of searching for Dark Matter with cosmic rays, and then summarize the status of such searches, focusing on some recent developments.
Jan de Boer | Quantum gravity and statistical physics
Просмотров 1,5 тыс.2 года назад
Speaker: Jan de Boer Date: Monday, March 14, 2022 Affiliation: University of Amsterdam Title: Quantum gravity and statistical physics Several puzzles and issues in quantum gravity are related to the question of what type of high-energy information is actually available to low-energy observers. In this talk I will try to argue that the best description available to a low-energy observer is proba...
Many-Body Localization and its Discontents
Просмотров 8842 года назад
Speaker: John Imbrie Date: Monday, March 7, 2022 Affiliation: University of Virginia Title: Many-Body Localization and its Discontents Abstract: A quantum system is said to be many-body localized (MBL) if it remains close to its initial state, i.e., it fails to thermalize. In 2016, I published a proof that certain one-dimensional spin chains have an MBL phase (the proof depended on a certain as...
Thermodynamics of Supersymmetric Black Holes
Просмотров 9662 года назад
Speaker: Finn Larsen Date: Monday, February 28, 2022 Affiliation: University of Michigan Title: Thermodynamics of Supersymmetric Black Holes Abstract: Supersymmetric black holes have zero temperature but their dependence on chemical potentials defines rather conventional thermodynamics. In anti-deSitter space, the phase diagram exhibits a confinement/deconfinement transition and other interesti...
Gino Isidori | Flavour Physics: Old problems and recent hopes
Просмотров 1,2 тыс.2 года назад
Speaker: Gino Isidori Date: Monday, January 31, 2022 Affiliation: University of Zürich Title: Flavour Physics: Old problems and recent hopes Abstract: Flavour physics represents one of the most puzzling aspect of particle physics and, at present, it is also one of the most active experimental frontiers. I present a brief introduction to this field, with special emphasis on the subject of Lepton...
Donal O'Connell | The double copy from Coulomb to Kerr
Просмотров 1,2 тыс.2 года назад
Speaker: Donal O'Connell Date: November 1, 2021 Affiliation: University of Edinburgh Title: The double copy from Coulomb to Kerr Abstract: The double copy relates scattering amplitudes in gauge theory and gravity. Recent work has shown that interaction potentials, spacetime metrics and gravitational waveforms can be extracted from amplitudes - and so the double copy leads to a relationship betw...
Gian Giudice | Self-Organised Localisation
Просмотров 5632 года назад
Speaker: Gian Guidice Date: November 15, 2021 Affiliation: CERN Title: Title: Self-Organised Localisation Abstract: Abstract: We describe a new phenomenon in quantum cosmology: self-organised localisation. When the fundamental parameters of a theory are functions of a scalar field subject to large fluctuations during inflation, quantum phase transitions can act as dynamical attractors. As a res...
Confinement/deconfinement transition in the D0-brane matrix model -- A signature of M-theory?
Просмотров 8112 года назад
Speaker: Manasori Hanada Date: October 28, 2021 Affiliation: University of Surrey Title: Confinement/deconfinement transition in the D0-brane matrix model A signature of M-theory? Abstract: In the past, numerical simulations provided us with quantitative evidence that the D0-brane matrix model (BFSS matrix model, or Matrix Model of M-theory) can describe type IIA superstring theory via gauge/gr...
Liam McAllister | Small Cosmological Constants in String Theory
Просмотров 1,2 тыс.2 года назад
Speaker: Liam McAllister Date: October 18, 2021 Affiliation: Cornell Title: Small Cosmological Constants in String Theory Abstract: We construct vacua of string theory in which all moduli are stabilized and the magnitude of the cosmological constant is exponentially small. The vacua are supersymmetric AdS_4 solutions in flux compactifications of type IIB string theory on orientifolds of Calabi-...
Ofer Aharony | Towards an explicit theory of quantum gravity
Просмотров 2,6 тыс.2 года назад
Ofer Aharony | Towards an explicit theory of quantum gravity
Ana-Maria Raclariu | Progress in Celestial Holography
Просмотров 1,6 тыс.2 года назад
Ana-Maria Raclariu | Progress in Celestial Holography
David Cyncynates: Friendly Axiverse
Просмотров 1,2 тыс.2 года назад
David Cyncynates: Friendly Axiverse
Saarik Kalia | The Earth as a transducer for dark-photon dark-matter detection
Просмотров 1,5 тыс.3 года назад
Saarik Kalia | The Earth as a transducer for dark-photon dark-matter detection
Micha Berkooz | Multi-trace correlators in the SYK model and Non-geometric wormholes
Просмотров 7063 года назад
Micha Berkooz | Multi-trace correlators in the SYK model and Non-geometric wormholes
Patrick Huber | Dark matter, neutrinos and nukes
Просмотров 1,1 тыс.3 года назад
Patrick Huber | Dark matter, neutrinos and nukes
Nina Holden | Liouville quantum gravity in probability theory
Просмотров 3,2 тыс.3 года назад
Nina Holden | Liouville quantum gravity in probability theory
Evan Mcdonough | Catastrophic Production of Slow Gravitinos
Просмотров 6693 года назад
Evan Mcdonough | Catastrophic Production of Slow Gravitinos
Yu-Tin Huang | IR constraints on UV physics: Bounds from the EFThedron
Просмотров 9393 года назад
Yu-Tin Huang | IR constraints on UV physics: Bounds from the EFThedron
Hazel Mak | Construction of 1D, N = 4 Supersymmetric SYK-Type Vertices
Просмотров 2753 года назад
Hazel Mak | Construction of 1D, N = 4 Supersymmetric SYK-Type Vertices
Sergei Dubovsky | Hidden Symmetry of Vanishing Love
Просмотров 5623 года назад
Sergei Dubovsky | Hidden Symmetry of Vanishing Love
David Curtin | A no-lose theorem for discovering the new physics of (g-2)
Просмотров 6743 года назад
David Curtin | A no-lose theorem for discovering the new physics of (g-2)
Zhen Liu | LHC opportunities in long-lived signatures from hidden sectors
Просмотров 4213 года назад
Zhen Liu | LHC opportunities in long-lived signatures from hidden sectors
Veronika Hubeny | Holographic Entropy Cone from Marginal Independence
Просмотров 5383 года назад
Veronika Hubeny | Holographic Entropy Cone from Marginal Independence
as if normal tensor is not troublesome enough! 😅 they made network out from it
I have a good idea of the system I’m going against, how much money circulates there and who depends on it. So I’m rocking it slowly, and then we’ll see what the Almighty will give. Basically, I look like a weak, blind, dirty kitten.
Any true big bang theory requires X2 faster than light speed accelerations have been labeled and called “inflationary expansions””... That’s the craziest impossibility that was ever told, and these liars did it with a straight face... !!! Albert Einstein thought that he proved mathematically using General Relativity (in 1915) , that real mass can not be accelerated to 100% of light speed. Only mass-less particles and waves that have next to no mass, but energy still can be ejected from atoms possessing momentum that travel very very close to the speed of light. The energy required to accelerate mass to the speed of light, Einstein said was almost infinite., but is that exactly true for all cases? Also no one has ever seen a star being born. The birth of stars can not be seen. Star formation is only just a theory among many theories. So to say it is a fact is a actually a lie: no one has seen stars being born, this is just another guess by the willful imaginations of a few evolutionary theorists. Please don't say things that can't be proven literally. QED If the left over initial heat energy from the Big Blam Bang were true, then entropy would have sucked all the energy out of the space between the stars. And so some of everything else taught at the university is wrong = BC
Since this lecture of course we now have the JWT.
Knew about black hole super conductor new material and many things
😂😂😂
this guy is as clear as mud
black ink question: in a real physical system, shaking hands will infect uninfected people only at the beginning. Shortly a high proportion of hand shakes will occur between people who both have black ink already. How long can how many people remain uninfected, with infected people "wasting" infecting attempts on people who are already infected? How much does this reduce / increase the system maximum/minimum? In a real system there is some viscosity, separating distant members, ie, light cones.
Vacuum entanglement… how fascinating 😮😮😮
Why is the image of the CMB elliptical and not circular? If we're measuring in every direction from Planet Earth, shouldn't our image look like a circle?
Worthless presentation technique, ignorant and booring person
This is really crappy
Where is the 2nd lecture???
This is a good introduction to sc …with a demonstration as well!
My question is whether or not we could use sound to create superconductivity. Like use soundwaves and acoustics to be able to create a negative pressure on a superconductive material and environment where we need superconductivity. So there would be soundwaves that would either hit a block of material and then it would float along the path of magnetic material. The reason is that it lowers the pressure in the material due to the acoustic sound waves that make the material vibrate causing it to have substantially less/more pressure and thus be able to be superconductive with energy and electricity versus liquid nitrogen or high pressure.
Another possibility: field of entanglement requires a particle to describe just like gravity requires a graviton ... entanglement particle is a tachyon of some sort?
i think the idea is that the entanglement manifests as spacetime itself
This goes down as one of the best lectures I have ever listened to
shame einstein
Hour and a half to cover "what we know about the big bang" Thank god I didnt find one about "what we DONT know about the big bang" I havent got a whole week to sit and watch a video.
CAN PEOPLE WITH PhD's REALLY BELIEVE SUCH RELIGIOUS GARBAGE ???? "Big Bang" & "Expanding Universe" THEORIES ! Both were published by a Belgian CATHOLIC PRIEST. Father George Lemaitre in 1927, with the blessing of the Pope. In an attempt to Hijack Science, and manufacture "Scientific proof" to prove the Biblical "Creation" Myth !
CAN PEOPLE WITH PhD's REALLY BELIEVE SUCH RELIGIOUS GARBAGE ???? "Big Bang" & "Expanding Universe" THEORIES ! Both were published by a Belgian CATHOLIC PRIEST. Father George Lemaitre in 1927, with the blessing of the Pope. In an attempt to Hijack Science, and manufacture "Scientific proof" to prove the Biblical "Creation" Myth !
Modern physics lecturers are so boring compared to LS, what happened?
What a beautiful presentation. So elegantly inspiring introduction of concepts
Leonard, Quantum Gravity is real. We now have a working Quantum Theory of Gravity that is testable and complete with reproducible empirical experiments with the same results if repeated over and over again and again, confirmed by empirical observations in nature with 7-Sigma level results, guided by empirical laws and physical/mathematical equations that are predictive, precise and does no collapse even in high energies of Big Bang and singularity of Black Hole. FYI: Quantum Gravity or Quantum Gravitation have three types that are equivalent to and manifested by Quantum Computational Gravitation- the biggest and most powerful Computer Software Program and Hardware in the Universe and Quantum Gravitational Entanglement - a Quantum Entanglement in Macroscopic Cosmic Scale namely: 1. Quantum Anti-Gravity = Spin Up Quantum Entanglement State; 2. Quantum Neutral Gravity = Superposition Quantum Entanglement State; and 3. Quantum Gravity = Spin Down Quantum Entanglement State. More detailed information could be found on the published papers 2 years ago in London, Paris, and Zurich, online and at the two scientific Journals ACADEMIA and REAL TRUE NATURE. Alternatively, you can google the name of the author ROEL REAL ROVIRA to arrive at the published paper on Quantum Gravity. Most recently, additional two well respected scientific journals namely NATURE and the AMERICAN PHYSICAL SOCIETY APS Physical Review Journals have officially invited this author to submit manuscripts on his Research on Quantum Gravity for publication for PRX QUANTUM in preparation for a celebration for International Year of Quantum IYQ 2025 to showcase the best papers of the year.
❤Thank you very much Professor and class for beautiful lesson and lecture
I wonder if Dark Energy IS Inflation
Class prank 😂
Where is Lecture 2? 😢
I joined a magic club in the past, and a surprising they stressed learning was the entertaining aspect of the show, along with magic tricks. One thing was called your "patter", your rhythm and timing of how you spoke to the crowd... it made the difference between an ameature bloke with slight of hand tricks, and a professional magician who can be hired to entertain people... this guy's patter is the closest to Feynman's public speaking voice I've ever heard. The patter is the same, except this guy doesn't look down and regularly pause for seconds like Feynman did. He's even got the same 'back east' Jewish New York subculture accent. Love it. = )
A great lecture, thanks SITP and Mr. Sean.
This was a pretty interesting lecture altogether. Thank you Stanford and professor Steven for taking the time to do this.
Great lecture, but I did not understand one detail: At time 1:04:27 Prof Kivelson is explaining that the two paired electrons are moving in the same trajectory but in opposite direction. Can someone explain why the pair electrons should move in reverse direction along the trajectory? If there is a form of attraction due to lattice deformation by the first electron the second one should go in the same direction following the first one.
In phonon mediated superconductivity, two electrons interact through a phonon. That means that we will have an electron with momentum k, another one with momentum k,' and a phonon with momentum q. Momentum conservation implies that after the interaction one electron has momentum k+q and the other one k-q. One of the important points about BCS theory is that the attractive interaction builds up in a shell around the Fermi surface (whose width is linked to a phonon energy scale, the Debye energy). But let's just focus on the fact that the electrons that keep the attractive interaction are within this shell. You can draw a circle in a piece of paper (that's your Fermi energy), and then some width around it (that's going to be your shell). Now take two points on the circle. These represent the electron states, with k and k'. Now you need to displace both by the same amount (q) but in different directions. If you pick both positions in the sphere randomly you'll notice that most of the time, if one of the points falls inside the shell, the other one goes out of the shell. This is bad: it means they are no longer in the attractive interaction regime, so no Cooper pair. Now do the same but pick opposite points in the circle. That represents k = k and k' = -k (that is, opposite direction!). If you repeat the exercise you'll see that most of the times if one stays in the shell, so does the other one. Meaning that after the phonon interaction they can still form a Cooper pair. So, long story short: having opposite momentum states (i.e. moving in opposite directions) ensures that the interaction between electrons through phonons is attractive.
@@elsejo_si Thank you for your answer, studying on it to try to understand the point. Thanks again.
They don't know the universe is expanding they think it is expanding and that is a very big difference
“The origin of momentum creation is founded on the application of energy. Momentum serves as the initial cause of pushing and pulling. The energy, emanating from the internal core of a planet, is what gives rise to momentum, commonly referred to as gravity, and not due to the planet’s size, mass, or space-time curvature. For example, when energy is applied, it generates the necessary momentum for the actions of pushing and pulling. Without the application of energy, momentum cannot be established. Consequently, force cannot be exerted for pushing and pulling, as it lacks a physical existence. This, in turn, clarifies why force is not gravity.” ~Guadalupe Guerra
I didn't understand any of this other than that quantum entanglement may be fundamental to spacetime. I guess I'll have to wait for Brian Greene, NDGT and Brain Cox to explain it to me in terms I can understand. It's a very interesting new development if true.
Check out Leonard Susskind interviewed by Brian Greene or also Leonard Susskind talking about ER=EPR
ruclips.net/video/OBPpRqxY8Uw/видео.htmlsi=-gAS89hx2mPGYv94
LOL. Computer generated images that pretend to be space.
7 years ago traversable wormholes were no possible. No longer the case anymore. What a crazy world we live now.
That's funny because there were no wormholes seven years ago and there still aren't any. ;-)
It is simple quantum entanglement create extra gravity which is dark energy. Problem maybe solved. Non locality phenomena is a force contributing to space higher deformation.
The human brain is hardwired to believe everything must have a begininng our intuition common sense and every experience we have in life reinforces this belief so when we look for an explanation to the nature of the universe we are not doing so with a mind open to all possibilities we have already subconsciously predetermined that at some point the universe came into existence. And we call that point of origin the big bang. This might not be the true nature of the universe but it is the only way we can conceive it to be
And now it´s time to use LK-99 ! 😮
Probably one of Susskind's last in person classes? Has he taught in person after the whole Covid shit? If he has or is hopefully we will see new videos soon!
When is Lenny going to write up the continuation to his Black Hole book, covering the AMPS challenge, the ER=EPR response, the Fuzball paradigm of Samir Mathur, the 2nd law of complexity, etc!?
The holographic principle asserts that a volume of space can be described entirely by theory on its boundary. While this principle originated in the context of black hole physics and string theory, its potential implications stretch far beyond those domains. It's a tool that allows us to think about complex systems from a new angle. Two fields where these ideas could yield novel insights are condensed matter physics and information theory. 1. Condensed Matter Physics: Condensed matter physics deals with the physical properties of matter in its condensed phase, which includes solids and liquids. The complexity of these systems often makes them difficult to describe with traditional methods. The application of holographic methods to condensed matter systems is often referred to as "holographic duality" or "gauge/gravity duality". Essentially, it's a theoretical tool that allows us to describe certain hard-to-solve quantum systems in terms of simpler classical systems in one higher dimension. The gravity side of the duality (the "bulk") is described by classical gravity, while the quantum system we're interested in (the "boundary") is described by a quantum field theory. For example, a strongly interacting quantum system (like a high-temperature superconductor) could be described by a higher-dimensional gravitational system. This duality can help us understand phenomena like quantum phase transitions, which are notoriously difficult to describe with traditional methods. Potential Novel Contribution Idea: An important challenge in condensed matter physics is understanding the behavior of systems far from equilibrium. These include systems undergoing phase transitions or subjected to sudden changes in conditions. The holographic principle might offer a new approach to studying these systems. Exploring this possibility could lead to novel insights into non-equilibrium phenomena in condensed matter physics. 2. Information Theory: Information theory is a branch of mathematics concerned with quantifying information and understanding the fundamental limits of data compression and reliable communication. The holographic principle's assertion about the amount of information that can be stored in a region of space has intriguing implications for information theory. The holographic principle implies a fundamental limit to the amount of information that can be stored in a given volume of space, determined by the area of its boundary. This is similar to the concept of information density in information theory, which describes the maximum amount of data that can be stored in a given physical system. Potentially novel Idea: A potential application of the holographic principle in information theory is in the design of data storage systems. The principle might provide fundamental limits on data storage density, which could inform the design of future storage technologies. It may also have implications for data transmission and communication protocols, particularly in the context of quantum information. These applications of the holographic principle outside high-energy physics are still in their early stages. Exploring these directions could lead to new insights and advancements in condensed matter physics and information theory, expanding our understanding of the fundamental nature of the universe and the information it contains.
holy shit. I can't believe I understood most of it if not all!
The adverts are a killer. You can't fall asleep to this. You'll be constantly skipping through ridiculously long adverts to often.
48:00 apology
Excellent.. I wish the lecture and formulas envolved the electric field
I thought Maldecena only showed gravity emerging in an ADS space, i.e. not this universe. Has this been resolved since then, or are we still talking about gravity inside Escher paintings?
God, no, please not virtual particles crossing the event horizon... no, don't think about it that way, don't think of anything that way. The field outside the horizon is perturbed by the charged particle as it crosses the horizon. The photons that maintain the field in this state are _always_ outside the event horizon. You do not need to invoke mathematical faeries or ogres to understand this or anything else.
He couldnt talk any more quickly ?