Events Archive

High Energy Theory Seminar

HET Seminar | Shai Chester, Princeton | "AdS_4/CFT_3 beyond supergravity" | PCTS Seminar Room

Fri, Mar 2, 2018, 1:45 pm

The paradigmatic example of AdS_4/CFT_3 relates M-theory on AdS_4 x S^7 to the family of maximally supersymmetric 3d CFTs discovered by Aharony, Bergman, Jafferis, and Maldacena (ABJM). I will focus on the stress tensor four point function for these dual theories.

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HET Seminar | Sylvain Carrozza, Perimeter Institute | "The large N melonic limit of O(N) tensor models" | PCTS Seminar Room

Mon, Feb 26, 2018, 2:30 pm

It has been recently recognized that the same type of melonic large N structure governs SYK models and tensor models alike. Following Witten and Klebanov-Tarnopolsky, this has led to the introduction of new SYK-like tensor models, which reproduce key features of SYK models in the familiar context of large N field theories.

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HET Seminar | Charles Rabideau, UPenn/Vrije Universiteit Brussel | "Holographic Entanglement and Poincare blocks in three-dimensional flat space" | PCTS Seminar Room

Mon, Feb 19, 2018, 2:30 pm

Inspired by a recent computation of holographic entanglement entropy in flat space holography, we proposed a covariant prescription to compute holographic entanglement entropy and Poincare blocks (Global BMS blocks) in the context of three-dimensional Einstein gravity in flat space.

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HET Seminar | Yifan Wang, Princeton | "A Precision Study of 5d Superconformal Fixed Points" | PCTS Seminar Room

Fri, Feb 16, 2018, 1:45 pm

Interacting unitary conformal fixed points in five dimensions are mysterious objects which often do not have weakly coupled UV descriptions. Their conformal data such as operator spectrum and correlation functions appear more elusive to conventional methods than in lower dimensions.

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HET Seminar | Vladimir Rosenhaus, KITP Santa Barbara | "New Large N Quantum Field Theories" | PCTS Seminar Room

Mon, Feb 12, 2018, 2:30 pm

                Quantum field theories with a large number of fields offer a number of simplifications, and in some cases allow for computations at strong coupling.

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HET Seminar | Brian Willett, UCSB | “Localization on Seifert Manifolds” | Jadwin A06

Fri, Feb 9, 2018, 1:45 pm

I discuss the partition functions of supersymmetric gauge theories on Seifert manifolds.  First we consider the case of 3d N=2 theories on a three-manifold M_{g,p}, a degree-p principal U(1) bundle over a smooth, genus-g Riemann surface.  This includes the topological index and the three-sphere and lens space partition functions as special...

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HET Seminar | Yasha Neiman, Okinawa Institute of Science and Technology | "Twistor and spinor-helicity languages for the free-CFT dual of higher-spin gravity" | Jadwin A06

Tue, Feb 6, 2018, 2:00 pm

The Penrose transform maps between functions in twistor space and solutions to free massless field equations in 4d. Higher-spin gravity is the ultimate massless 4d theory, which allows a unique geometric perspective on the Penrose transform, as I will describe.

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HET Seminar at IAS | Riccardo Rattazzi, CERN | “CFT Data at Large Charge from EFT”

Mon, Feb 5, 2018, 2:30 pm

Properties of CFT operators carrying some large global charge can be systematically computed in a 1/Q expansion by assuming that the corresponding states on the cylinderare described by a supefluid phase. In particular one can compute the spectrum of such “heavy" operators and the heavy-heavy-light fusion coefficients.

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HET Seminar | Clay Cordova, Institute for Advanced Study | Symmetries in Quantum Field Theory | PCTS, 407 Jadwin

Wed, Jan 17, 2018, 2:30 pm

Abstract:  Symmetry underlies the foundations of quantum field theory, defining concepts like particles and helping to organize their properties.  In this talk I will illustrate several modern topics in the study of symmetry including infinite-dimensional representations in conformal field theory, constraints of current algebra and energy...

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HET Seminar | Beni Yoshida, Perimeter Institute | "Decoding a black hole" | Jadwin A09

Tue, Jan 16, 2018, 2:30 pm

It is commonly believed that quantum information is not lost in a black hole. Instead, it is encoded into non-local degrees of freedom in some clever way; like a quantum error-correcting code. In this talk, I will present two decoding procedures for reconstructing a quantum state from the Hawking radiation in the Hayden-Preskill thought...

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HET Seminar at IAS | Steve Hsu, Michigan State University | “Genomic Prediction of Complex Traits”

Fri, Jan 12, 2018, 1:45 pm

After a brief review (suitable for physicists) of computational genomics and complex traits, I describe recent progress in this area.

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HET Seminar | Nima Lashkari, MIT | “Universality of Quantum Information in Chaotic CFTs”

Fri, Dec 15, 2017, 1:45 pm

We study the Eigenstate Thermalization Hypothesis (ETH) in chaotic conformal field theories (CFTs) of arbitrary dimensions. Assuming local ETH, we compute the reduced density matrix of a ball-shaped subsystem of finite size in the infinite volume limit when the full system is an energy eigenstate.

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HET Seminar at IAS | Kurt Hinterbichler, Case Western Reserve University | "TBA"

Mon, Dec 11, 2017, 2:30 pm
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HET Seminar | Alexander Zhiboedov, Harvard | “Conformal Field Theories in the Regge Limit” | PCTS Seminar Room

Mon, Dec 4, 2017, 2:30 pm

I will review recent developments in the understanding of Lorentzian correlators in generic CFTs. I will then discuss two applications of these developments. The first one involves bounds on the OPE coefficients on the leading Regge trajectory. In theories with gravity duals, it constrains certain higher-derivative corrections to the Einstein ...

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HET Seminar | Zohar Komargodski, Stony Brook | "Dynamics in 2+1 Dimensions" | PCTS Seminar Room

Fri, Dec 1, 2017, 1:45 pm

We explain recent ideas that led to rapid progress on the dynamics of gauge theories in 2+1 dimensions. 

We discuss gauge theories with matter particles in the fundamental as well as in the adjoint representations. We make predictions for new phases of these theories and explain some special cases where these predictions can be already...

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HET Seminar at IAS | Andrew Liam Fitzpatrick, Boston University | “Information Loss and Bulk Reconstruction in AdS_3/CFT_2”

Mon, Nov 27, 2017, 2:30 pm

We discuss how to obtain dynamics of semiclassical gravity in 3d AdS from the large central charge limit of irreducible representations of the conformal algebra of 2d CFTs, with a focus on black hole information loss and bulk reconstruction.

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HET Seminar | Lorenzo Di Pietro, Perimeter Institute | "Loops in AdS from Hamiltonian approach" | PCTS Seminar Room

Mon, Nov 20, 2017, 2:30 pm

I will discuss a method to compute 1/N corrections in large N CFTs based on the Rayleigh-Schroedinger perturbation theory for the dilatation operator. I will apply the method to the simplest examples, i.e.

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HET Seminar | Petr Kravchuk, Caltech | “6j symbols and conformal blocks” | PCTS Seminar Room

Tue, Nov 14, 2017, 1:30 pm

I will explain how conformally-covariant differential operators arise from finite-dimensional representations of the (global) conformal group.

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HET Seminar at IAS | Roji Pius, Perimeter Institute | "Quantum Closed Superstring Field Theory and the Weil-Petersson Symplectic Geometry"

Mon, Nov 13, 2017, 2:30 pm

String field theory is the refined definition of string theory, formulated in the language of quantum field theory. Unlike the conventional Polyakov  approach, it provides a well defined prescription for computing the scattering amplitudes in string theory, even when there is mass renormalization and quantum corrections to the background.

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HET Seminar | Shira Chapman, Perimeter Institute | "Complexity in holography and QFT" | PCTS Seminar Room

Fri, Nov 10, 2017, 1:45 pm

I will review the concept of quantum complexity of a state and the related holographic conjectures. I will discuss certain properties of holographic complexity, namely, the structure of divergences, the complexity of forming a thermal state, and the time dependence of complexity.

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