Latest Avit Podcast Episodes
The erasure of topological defects and the saturation phenomenon
Sommerfeld Theory Colloquium (ASC) - June 27, 2024 09:31 - 1 hour - Video ★★★★★ - 2 ratingsInteresting erasure phenomena arise from interactions between lower-dimensional and higher-dimensional objects and impact cosmology and fundamental physics. In the first part of the colloquium, I will examine the case for topological defects, revealing insights into the interactions of magnetic m...
A Closer Look at Black Holes
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsSeveral new techniques are currently being employed to probe the strong gravitational fi�eld in the vicinity of black holes. Long baselineinterferometry at sub-millimeter wavelengths sets constraints on the silhouette of the black holes in the Galactic center (SgrA*) and M87. Stars which get tida...
Resurgence and non-perturbative physics
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsPerturbation theory remains one of the main tools in physics, in particular in quantum theories. However, most perturbative series diverge factorially, and it is not obvious how to extract information from them. Their divergence also suggests that, in order to obtain accurate results, one might n...
Revisiting the S-matrix bootstrap
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsSommerfeld Theory Colloquium
R-matrix Quantization of the Ruijsenaars-Schneider Models
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsI describe an algebraic scheme for quantizing the Ruijsenaars-Schneider models in the R-matrix formalism. It is based on a special parametrization of the cotangent bundle over GL(n,C). In new variables the standard symplectic structure is described by a classical (Frobenius) r-matrix and by a new...
Scattering Amplitudes from Geometry
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsI will review for a general audience some recent developments in our understanding of the mathematical structure of scattering amplitudes in quantum field theory. Many of these developments involve properties that have been discovered ”experimentally”: not in actual experiments, but by carrying o...
Searching for New Forces Using Torsion Pendula
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 56 minutes - Video ★★★★★ - 2 ratingsEquivalence principle violation, deviations from the inverse-square law of gravity, and long-range interactions between particle spins o�er powerful tests of beyond-the-standard-model physics. Using a torsion pendulum, a technique that dates to the 18th century, is still the most sensitive way to...
Self-organization and self-assembly in biologically inspired non-equilibrium systems
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 58 minutes - Video ★★★★★ - 2 ratingsSommerfeld Theory Colloquium
Sommerfeld Lecture Series
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsThe central mystery in quantum matter is the general nature of mat- ter formed from fermions. The methods of many body quantum physics fail and one can only rely on the phenomenological Fermi- liquid and BCS theories. However, in heavy fermion systems and cuprates one deals with non Fermi-liquid ...
Sommerfeld Theory Colloquium
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsThe Sun is a most remarkable object: it is filled with vibrantly evolv- ing magnetic fields, well-mixed hierarchically-arranged turbulent con- vective cells, and also poorly-mixed sunspots that persist with im- punity. Solar variability has direct consequences for the earth and space weather, an ...
Space-Time-Matter: Finite Projective Geometry as a Quantum World with Elementary Particles
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsA unified theory for space-time and matter might be based on finite projective geometries instead of differentiable manifolds and gauge groups. Each point is equipped with a quadratic form over a finite Galois field which define neighbors in the finite set of points. Due to the projective equival...
Searching for Cosmic Strings in New Observational Windows
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsMany particle physics theories beyond the Standard Model (BSM) admit topologically stable cosmic string solutions. If Nature is described by such a theory, a network of strings will form in the early universe and persist to the present time. The strings carry energy and hence lead to characterist...
Status of the Electroweak Standard Model
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsWith the discovery of the Higgs boson and the determination of its mass, the Standard Model is complete and its parameters are now known and over-constrained. I will review the status and future directions in precision electroweak physics both at high and low en- ergies. There is strong evidence ...
Strange effects in the neutrino oscillations
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsAlthough the neutrino oscillations are well established phenomenon, new and unusual oscillation effects in matter are still emerging. I will describe three such effects which have applications to the solar, supernova and low energy atmospheric neutrinos: (i) Parametric resonance for neutrinos pro...
Supermassive Black Holes: From Jets to the Event Horizon
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsHighest resolution Event Horizon Telescope (EHT) observations will probably soon tell us more about the supermassive black hole at the Galactic Centre (Sgr A*) and the cores of active galactic nuclei (AGN). It might also help to clarify the long-standing question whether the central massive objec...
Symmetry in quantum gravity
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsIt has long been expected that the symmetry structure of quantum gravity is highly constrained. In particular it has been conjectured that global symmetries do not exist, and also that there must exist objects carrying all possible gauge charges. Until recently however there has been no systema...
The asymptotic structure of gravity at spatial infinity (D=4 and D>4)
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsThe asymptotic structure of gravity in the asymptotically flat case will be described in four and higher spacetime dimensions by making central use of the Hamiltonian formalism. Special emphasis will be paid to the case D=5. How the relevant infinite-dimensional asymptotic symmetry group (BMS gro...
The Black Hole Information Paradox Revisited
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsI describe the physics of black holes and show how the traditional approach leads to the information paradox. I will then discuss some of the proposed resolutions and the difficulties they need to overcome. I then discuss soft black hole hair and describe how it may help to resolve the informatio...
The development of twistor geometry for the description of fundamental physics
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsI will review the basic defi�nitions and ideas of the twistor program for fundamental physics, as started by Roger Penrose around 1970. I will give particular attention to certain conformally invariant struc- tures involving deformed helicities, relevant to scattering amplitudes for massless �eld...
Statistical Physics and Information Theory : New Frontiers
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsSince the emergence of information theory in the middle of the 20th century, this new scientific field has been deeply entangled with statistical physics, as attested from the beginning by the use of entropy to quantify information content. The talk will explore the major impact of these transdis...
The "Flavor" of Particle Physics
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsSommerfeld Theory Colloquium
The History behind the Brout-Englert-Mechanism and the Standard Model
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsI will describe the process of how to award Nobel Prizes and then give the history behind this year’s prize.
The Many Faces of Conformal Interfaces
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 59 minutes - Video ★★★★★ - 2 ratingsConformal interfaces are the long-distance limits of domain walls. They play a role in condensed-matter physics, and could be also rel- evant for theories of gravity. I will review some recently-developed techniques for analyzing their properties, and will discuss their pos- sible applications.
The massless limit of massive gauge fields
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 41 minutes - Video ★★★★★ - 2 ratingsOne of the simplest ways to make gauge fields massive is to add them a mass "by hand". Intuitively, one could expect that the corresponding massless theory would then be easy to recover. Yet, conventional methods indicate that such a limit is singular. In this talk, we will explore the massless l...
The mathematics behind Feynman integrals
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsFeynman integrals are indispensable for precision calculations, not only for high-energy particle physics experiments, but also for example for QED precision experiments at lower energies or precision studies in gravitational wave physics. In recent years there has been a significant progress in ...
The next ten years of dark energy research
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsIn the next few years new data from ground and space will push the limit of cosmological observations to new frontiers. Combining CMB, weak lensing, redshift clustering and supernovae data, we will be able to constrain the properties of dark energy and its interactions from the background to the ...
The Nobel Prizes in Physics in 1932/33: Heisenberg, Schrödinger and Dirac
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 43 minutes - Video ★★★★★ - 2 ratingsThe Nobel Prize in Physics in 1930 was awarded to Raman for the discovery of the effect named after him. The next time physics prizes were announced was in November 1933, which makes this the longest peace-time gap in the history of the Nobel Prize in Physics. Considering that the 1932 year’s pri...
The Physics of Active Matter
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsOver the past ten years, there has been a growing interest among physicists for ‘active matter’, a codename that encompasses systems in which energy is taken from the environment to generate self-propulsion at the single particle level. Active particles, such as run-and-tumble bacteria, self-diff...
The protein doctors: how chaperons repair damaged proteins
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsThe life of a protein, from birth till death, is complex and challenging. At times, because of stresses or bad luck, it might take the wrong conformation and start aggregating. This process is intrinsic to the physics of proteins, and life has had to cope with it since its early days. The solutio...
The role of duality in transport in imperfect Luttinger liquid
Sommerfeld Theory Colloquium (ASC) - June 26, 2024 15:30 - 1 hour - Video ★★★★★ - 2 ratingsA single potential impurity can drastically change a low-temperature transport of strongly interacting particles in one dimension - a sys- tem which is known as the Luttinger liquid. An arbitrary weak backscattering of fermions from the impurity totally destroys their zero-temperature current whi...
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