Quantum Fields and Strings

Displaying 385 - 396 of 734

Infinite Chiral Symmetry in Four Dimensions

Wolfger Peelaers University of Oxford

September 16, 2014

PIRSA:14090079
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University
September 12, 2014

PIRSA:14090071
Quantum Fields and Strings
The Gravity Dual of Supersymmetric Gauge Theories on a Squashed Five-Sphere

Martin Fluder University of Oxford

August 26, 2014

PIRSA:14080003
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Ibrahima Bah University of Southern California (USC)
July 22, 2014

PIRSA:14070032
Quantum Fields and Strings
Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Jaewon Song University of California, San Diego
July 15, 2014

PIRSA:14070024
Quantum Fields and Strings
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign
June 17, 2014

PIRSA:14060047
Quantum Fields and Strings
Gauge fields in de Sitter space: antipodal symmetry and holography

Yasha Neiman Okinawa Institute of Science and Technology Graduate University
June 03, 2014

PIRSA:14060039
Quantum Fields and Strings
M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
Quantum Fields and Strings
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
Quantum Fields and Strings
Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
May 06, 2014

PIRSA:14050035
Quantum Fields and Strings
Probing renormalization group flows using entanglement entropy

Mark Mezei Massachusetts Institute of Technology (MIT)
April 30, 2014

PIRSA:14040144
Quantum Fields and Strings
Localizing Braneworlds in Infinite Spaces

Kellogg Stelle Imperial College London
April 29, 2014

PIRSA:14040064
Quantum Fields and Strings

Infinite Chiral Symmetry in Four Dimensions

Wolfger Peelaers University of Oxford

September 16, 2014

PIRSA:14090079

We describe a new correspondence between four-dimensional conformal field theories with extended supersymmetry and two-dimensional chiral algebras. We explore the resulting chiral algebras in the context of theories of class S. The class S duality web implies nontrivial associativity properties for the corresponding chiral algebras, the structure of which can be summarized by a generalized topological quantum field theory.
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University
September 12, 2014

PIRSA:14090071
Quantum Fields and Strings
At large N, an important sector of the ABJM field theory defined on a stack of N M2-branes can be described holographically by the D=4 N=8 SO(8)-gauged supergravity of de Wit and Nicolai. Since its inception, the latter has been tacitly assumed to be unique. Recently, however, a one-parameter family of SO(8) gaugings of N=8 supergravity has been discovered, the de Wit-Nicolai theory being just a member in this class. I will explain how this overlooked family of SO(8)-gauged supergravities is deeply related to electric/magnetic duality breaking in four dimensions. I will then discuss some predictions that can be made about the family of dual large-N field theories that these supergravities define, focusing on the structure of superconformal phases and the RG flows between them. I will finally argue that when the gauging is chosen to be related, but different, to the SO(8) one, the D=4 N=8 family arises as consistent truncation of massive IIA on the six-sphere, with the Romans mass identified as the electric/magnetic duality-breaking parameter.
The Gravity Dual of Supersymmetric Gauge Theories on a Squashed Five-Sphere

Martin Fluder University of Oxford

August 26, 2014

PIRSA:14080003

We construct the gravity duals of large N supersymmetric gauge theories on a squashed five-sphere. They are constructed in Euclidean Romans F(4) gauged supergravity in six-dimensions. We find a one- as well as a two-parameter family of solutions and evaluate the renormalised on-shell and fundamental string action for these solutions to find precise agreement with gauge theory.
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Ibrahima Bah University of Southern California (USC)
July 22, 2014

PIRSA:14070032
Quantum Fields and Strings
We provide a framework for describing gravity duals of four-dimensional N=1 superconformal field theories obtained by compactifying a stack of M5-branes on a Riemann surface. The gravity solutions are completely specified by two scalar potentials whose pole structures on the Riemann surface correspond to the spectrum of punctures that labels different theories. We discuss how to identify these puncture in gravity.
Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Jaewon Song University of California, San Diego
July 15, 2014

PIRSA:14070024
Quantum Fields and Strings
We study a class of 4d N=1 SCFTs obtained from partial compactifications of 6d N=(2, 0) theory on a Riemann surface with punctures. We identify theories corresponding to curves with general type of punctures through nilpotent Higgsing and Seiberg dualities. The `quiver tails' of N=1 class S theories turn out to differ significantly from N=2 counterpart and have interesting properties. Various dual descriptions for such a theory can be found by using colored pair-of-pants decompositions. Especially, we find N=1 analog of Argyres-Seiberg duality for the SQCD with various gauge groups. We compute anomaly coefficients and superconformal indices to verify our proposal.
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign
June 17, 2014

PIRSA:14060047
Quantum Fields and Strings
Gauge fields in de Sitter space: antipodal symmetry and holography

Yasha Neiman Okinawa Institute of Science and Technology Graduate University
June 03, 2014

PIRSA:14060039
Quantum Fields and Strings
There is a proposed dS/CFT duality in 3+1 dimensions, with higher-spin gravity in the bulk subject to Bunch-Davies boundary conditions. I consider replacing these with antipodally symmetric conditions, which allow for real values of the bulk fields. I present spanning sets of solutions in global dS_4 for free gauge fields of all spins (including photons and gravitons), and use them to establish relations between antipodal symmetry and asymptotic behavior. Some of these relations can be extended to interacting theories, including ordinary and higher-spin gravity. I discuss the implications for antipodally symmetric dS/CFT.
M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
Quantum Fields and Strings
We consider M-theory in the presence of M parallel M5-branes probing a transverse A_{N-1} singularity. This leads to a superconformal theory with (1,0) supersymmetry in six dimensions. We compute the supersymmetric partition function of this theory on a two-torus, with arbitrary supersymmetry preserving twists, using the topological vertex formalism. Alternatively, we show that this can also be obtained by computing the elliptic genus of an orbifold of recently studied M-strings. The resulting 2d theory is a (4,0) supersymmetric quiver gauge theory whose Higgs branch corresponds to strings propagating on the moduli space of SU(N)^(M-1) instantons on R^4 where the right-moving fermions are coupled to a particular bundle.
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
Quantum Fields and Strings
We present explicit computations and conjectures for 2 → 2 scattering matrices in large N U(N) Chern-Simons theories coupled to fundamental bosonic or fermionic matter to all orders in the ’t Hooft coupling expansion. The bosonic and fermionic S-matrices map to each other under the recently conjectured Bose-Fermi duality after a level-rank transposition. The S-matrices presented in this paper may be regarded as relativistic generalization of Aharonov-Bohm scattering. They have unusual structural features: they include a non analytic piece localized on forward scattering, and obey modified crossing symmetry rules. We conjecture that these unusual features are properties of S-matrices in all Chern-Simons matter theories. The S-matrix in one of the exchange channels in our paper has an anyonic character; the parameter map of the conjectured Bose-Fermi duality may be derived by equating the anyonic phase in the bosonic and fermionic theories.
Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
May 06, 2014

PIRSA:14050035
Quantum Fields and Strings
There is a close connection between Symmetry Protected Topological Phases and anomalies: a surface of an SPT phase typically has a global symmetry with a nonvanishing 't Hooft anomaly which is canceled by the anomaly inflow from the bulk. This observation together with the known results about the classification of SPT phases suggest that anomalies are much more ubiquitous than thought previously and do not require chiral fermions We elucidate the physical mechanism of anomalies and give examples of bosonic theories with 't Hooft anomalies in various dimensions.
Probing renormalization group flows using entanglement entropy

Mark Mezei Massachusetts Institute of Technology (MIT)
April 30, 2014

PIRSA:14040144
Quantum Fields and Strings
The entanglement entropy of the vacuum of a quantum field theory contains information about physics at all scales and is UV sensitive. A simple refinement of entanglement entropy gets rid of its UV divergence, and allows us to extract entanglement per scale. In two and three spacetime dimensions this quantity can be used as a proxy for the number of degrees of freedom, as it decreases under RG flow. We investigate its behavior around fixed points, and reveal its interesting analytic structure in the space of couplings.
Localizing Braneworlds in Infinite Spaces

Kellogg Stelle Imperial College London
April 29, 2014

PIRSA:14040064
Quantum Fields and Strings
There have been a number of attempts to achieve a localization of gravity on a braneworld hypersurface embedded in an infinite spacetime, but these have all fallen short of what might be desired, for various reasons. There have even been no-go theorems claimed for constructions made using just accepted elements of string or M theory. The talk will present a proposed resolution of this problem based upon a hyperbolic solution of type IIA theory with a superposed NS-5 brane. Gravity is bound to the brane surface owing to the existence of a single normalizable bound state of the transverse space Laplacian.

Title	Speaker(s)	Date	Talk Type	Info
Infinite Chiral Symmetry in Four Dimensions	Wolfger Peelaers	2014-09-16	Scientific Series	View details
Maximal supergravity, holography and the Romans mass	Oscar Varela	2014-09-12	Scientific Series	View details
The Gravity Dual of Supersymmetric Gauge Theories on a Squashed Five-Sphere	Martin Fluder	2014-08-26	Scientific Series	View details
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's	Ibrahima Bah	2014-07-22	Scientific Series	View details
Exploring N=1 theories of class S through Higgsing, dualizing and twisting	Jaewon Song	2014-07-15	Scientific Series	View details
The Exact Renormalization Group and Higher Spin Holography.	Rob Leigh	2014-06-17	Scientific Series	View details
Gauge fields in de Sitter space: antipodal symmetry and holography	Yasha Neiman	2014-06-03	Scientific Series	View details
M-strings and their orbifolds	Babak Haghighat	2014-05-20	Scientific Series	View details
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter	Shiraz Minwalla	2014-05-13	Scientific Series	View details
Anomalies of discrete symmetries and Symmetry Protected Topological Phases	Anton Kapustin	2014-05-06	Scientific Series	View details
Probing renormalization group flows using entanglement entropy	Mark Mezei	2014-04-30	Scientific Series	View details
Localizing Braneworlds in Infinite Spaces	Kellogg Stelle	2014-04-29	Scientific Series	View details

Quantum Fields and Strings

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