Quantum Fields and Strings

740 talks

S003

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Displaying 445 - 456 of 740

A monodromy defect in the 3d Ising model.

Roberto Pellegrini National Institute for Nuclear Physics
January 22, 2013

PIRSA:13010106
High Energy Physics
Superhorizon fluctuations in de Sitter and cosmological spacetimes

Guilherme Pimentel Universiteit van Amsterdam
January 15, 2013

PIRSA:13010001
High Energy Physics

Astrophysics
Worldsheet form factors in AdS/CFT

Tristan McLoughlin Trinity College Dublin
January 08, 2013

PIRSA:13010022
High Energy Physics
All one-loop amplitudes in N=6 Chern-Simons matter theories

Congkao Wen Queen Mary University of London
December 18, 2012

PIRSA:12120005
High Energy Physics
(0,2) Gauge Dynamics and Flux Compactifications

Callum Quigley Kirkland & Ellis
December 11, 2012

PIRSA:12120006
High Energy Physics
Unitarity, black hole microstates and how Alices fuzzes but may not even know it

Andrea Puhm University of Amsterdam
December 06, 2012

PIRSA:12120029
High Energy Physics
The Spectrum of Strings on Warped AdS3

Wei Song Harvard University
December 05, 2012

PIRSA:12120027
High Energy Physics
Moduli Stabilization and Holographic RG
December 04, 2012

PIRSA:12120002
High Energy Physics
Chern-Simons Contact Terms

Thomas Dumitrescu University of California, Los Angeles
November 28, 2012

PIRSA:12110094
High Energy Physics
Bootstrapping CFTs with the Extremal Functional Method

Miguel Paulos École Normale Supérieure - PSL
November 27, 2012

PIRSA:12110049
High Energy Physics
3 point functions in the AdS4/CFT3 correspondence

Agnese Bissi The Abdus Salam International Centre for Theoretical Physics (ICTP)
November 20, 2012

PIRSA:12110053
High Energy Physics
Anomaly-induced transport and thermodynamics

Kristan Jensen University of Victoria
November 13, 2012

PIRSA:12110047
High Energy Physics

A monodromy defect in the 3d Ising model.

Roberto Pellegrini National Institute for Nuclear Physics
January 22, 2013

PIRSA:13010106
High Energy Physics
A conformal defect is a d-dimensional geometrical object that breaks the SO(D+1,1) symmetry, of a D-dimensional conformal field theory, down to those transformations that leave the defect invariant i.e. SO(D-d) X SO(d+1,1).
We studied the 3D critical Ising model in presence of a special kind of these defects, a monodromy line defect.
In particular we computed, using Montecarlo simulations, the anomalous dimensions of the lowest dimensional operators living at the defect, as well as correlation functions of operators in the bulk with operators at the defect.
We found a good agreement between our results and the expectations of conformal field theory.
Superhorizon fluctuations in de Sitter and cosmological spacetimes

Guilherme Pimentel Universiteit van Amsterdam
January 15, 2013

PIRSA:13010001
High Energy Physics

Astrophysics
I will discuss superhorizon fluctuations in de Sitter space. The first part of the talk will focus on computing entanglement entropies of field theories in a fixed de Sitter background. Those computations are done for free theories and also theories with gravity duals. If time permits, I will also discuss superhorizon fluctuations in cosmological backgrounds. In particular, I focus on showing that subhorizon fluctuations can not produce any significant backreaction on superhorizon modes. If those late time effects existed, one in principle could not trust the scale invariant spectrum of inflationary theories to be the source of the spectrum of thermal fluctuations of the CMB.
Worldsheet form factors in AdS/CFT

Tristan McLoughlin Trinity College Dublin
January 08, 2013

PIRSA:13010022
High Energy Physics
The study of the worldsheet S-matrix for AdS_5×S^5 strings was a key step in the complete determination of the non-pertubrative planar spectrum of anomalous dimensions for N=4 super-Yang-Mills. To go beyond the spectral problem it is important to consider higher-point worldsheet correlation functions and, as is standard in many integrable models, one approach is the study of form factors. We will discuss a set of consistency conditions appropriate to form factors in the light-cone gauge fixed AdS_5×S^5 string theory. We further discuss the form factors in the weakly coupled dual description, verifying that the relevant conditions naturally hold for the one-loop Heisenberg spin-chain.
All one-loop amplitudes in N=6 Chern-Simons matter theories

Congkao Wen Queen Mary University of London
December 18, 2012

PIRSA:12120005
High Energy Physics
In this talk we will present results on all one-loop scattering amplitudes in N=6 Chern-Simons matter theories. Especially we will discuss connection between certain triple-cut diagrams and tree-level recursive diagrams, and a general formula capturing the multi-particle factorization of arbitrary one-loop amplitudes in the theories is obtained from this connection. Furthermore a recursion relation for the supercoefficients of one-loop amplitudes will be derived, which leads the solution for all one-loop amplitudes.
(0,2) Gauge Dynamics and Flux Compactifications

Callum Quigley Kirkland & Ellis
December 11, 2012

PIRSA:12120006
High Energy Physics
Two-dimensional gauge theories with (0,2) supersymmetry admit a much broader, and more interesting, class of solutions than their better studied (2,2) counterparts. In this talk, we will explore some of the possibilities that are offered by this additional freedom. The moduli spaces we find can be interpreted as the target spaces for heterotic strings moving in backgrounds with non-trivial H-flux. A remarkable relationship between (0,2) gauge anomalies and H-flux will emerge.
Unitarity, black hole microstates and how Alices fuzzes but may not even know it

Andrea Puhm University of Amsterdam
December 06, 2012

PIRSA:12120029
High Energy Physics
The information paradox and the infall problem have been long-standing puzzles in the understanding of black holes. The idea of free infall is in considerable tension with unitarity of the evaporation process and recent developements have made this tension sharp. In the first part of my talk I will address the information question and argue that unitarty requires every quantum of radiation leaving the black hole to carry information about the initial state. Unitary evaporation is thus inconsistent with an information-free horizon at every step of the evaporation process and this extends the recent firewall result. This immediately raises the question of What is the required horizon-scale structure? I will show an explicit construction of near-extremal black hole microstates which put flesh and branes on the fuzzball proposal and may realize firewalls in string theory. In the second part I will address the question of What happens to an observer falling into a fuzzball? I will argue that the answer is dependent on the energy scale of the infalling observer.
The Spectrum of Strings on Warped AdS3

Wei Song Harvard University
December 05, 2012

PIRSA:12120027
High Energy Physics
Warped AdS3 has isometry SL(2,R) x U(1). It is closed related to Kerr/CFT, non local dipole theories and AdS/CMT. In this talk I will derive the spectrum of string theory on Warped AdS3. This is possible because the worldsheet theory can be mapped to the worldsheet on AdS3 by a nonlocal field redefinition.
Moduli Stabilization and Holographic RG
December 04, 2012

PIRSA:12120002
High Energy Physics
In this talk, I will relate moduli stabilization in AdS or de Sitter space to basic properties of the Wilsonian action in the holographic dual theory living on dS (of one lower dimension): the single-trace terms in the action have vanishing beta functions, and higher-trace couplings are determined purely from lower-trace ones (a property we refer to as the iterative structure of RG). In the dS case, this encodes the maximal symmetry of the bulk spacetime in a quantity which is accessible within a single observer's patch.
Chern-Simons Contact Terms

Thomas Dumitrescu University of California, Los Angeles
November 28, 2012

PIRSA:12110094
High Energy Physics
Chern-Simons contact terms constitute new observables in three-dimensional quantum field theory. In N=2 supersymmetric theories with an R-symmetry, they lead to a superconformal anomaly. This understanding clarifies several puzzles surrounding the S3 partition function of these theories. In particular, it leads to a proof of the F-maximization principle. Chern-Simons contact terms can be computed exactly using localization and lead to new tests of proposed dualities.
Bootstrapping CFTs with the Extremal Functional Method

Miguel Paulos École Normale Supérieure - PSL
November 27, 2012

PIRSA:12110049
High Energy Physics
The existence of a positive linear functional acting on the space of (differences between) conformal blocks has been shown to rule out regions in the parameter space of conformal field theories (CFTs). We argue that at the boundary of the allowed region the extremal functional contains, in principle, enough information to determine the dimensions and OPE coefficients of an infinite number of operators appearing in the correlator under analysis. Based on this idea we develop the Extremal Functional Method (EFM), a numerical procedure for deriving the spectrum and OPE coefficients of CFTs lying on the boundary (of solution space). We test the EFM by using it to rederive the low lying spectrum and OPE coefficients of the 2d Ising model based solely on the dimension of a single scalar quasi-primary -- no Virasoro algebra required. Our work serves as a benchmark for applications to more interesting, less known CFTs in the near future, such as the 3d Ising model.
3 point functions in the AdS4/CFT3 correspondence

Agnese Bissi The Abdus Salam International Centre for Theoretical Physics (ICTP)
November 20, 2012

PIRSA:12110053
High Energy Physics
I will present recent developments in the computation of three point functions in the AdS4/CFT3 correspondence. More specifically I will consider two different computations for three point functions of operators belonging to the SU(2)XSU(2) sector of ABJM. I will discuss first the generalization of the determinant representation, found by Foda for the three-point functions of the SU(2) sector of N = 4 SYM, to the ABJM theory and secondly semiclassical computations in the case where two operators are heavy and one is light and BPS, comparing the results obtained in the gauge theory side using a coherent state description of the heavy operators with its string theory counterpart calculated holographically.
Anomaly-induced transport and thermodynamics

Kristan Jensen University of Victoria
November 13, 2012

PIRSA:12110047
High Energy Physics
I will discuss recent progress in the study of anomaly-induced transport, focusing on the chiral vortical effect in 3+1 dimensions. Most of my discussion will be framed in light of a larger story, namely progress in making exact statements about finite-temperature quantum field theory, for which the chiral magnetic and vortical effects are instructive prototypes.

Title	Speaker(s)	Date	Talk Type	Info
A monodromy defect in the 3d Ising model.	Roberto Pellegrini	2013-01-22	Scientific Series	View details
Superhorizon fluctuations in de Sitter and cosmological spacetimes	Guilherme Pimentel	2013-01-15	Scientific Series	View details
Worldsheet form factors in AdS/CFT	Tristan McLoughlin	2013-01-08	Scientific Series	View details
All one-loop amplitudes in N=6 Chern-Simons matter theories	Congkao Wen	2012-12-18	Scientific Series	View details
(0,2) Gauge Dynamics and Flux Compactifications	Callum Quigley	2012-12-11	Scientific Series	View details
Unitarity, black hole microstates and how Alices fuzzes but may not even know it	Andrea Puhm	2012-12-06	Scientific Series	View details
The Spectrum of Strings on Warped AdS3	Wei Song	2012-12-05	Scientific Series	View details
Moduli Stabilization and Holographic RG		2012-12-04	Scientific Series	View details
Chern-Simons Contact Terms	Thomas Dumitrescu	2012-11-28	Scientific Series	View details
Bootstrapping CFTs with the Extremal Functional Method	Miguel Paulos	2012-11-27	Scientific Series	View details
3 point functions in the AdS4/CFT3 correspondence	Agnese Bissi	2012-11-20	Scientific Series	View details
Anomaly-induced transport and thermodynamics	Kristan Jensen	2012-11-13	Scientific Series	View details

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Quantum Fields and Strings

Format results

A monodromy defect in the 3d Ising model.

Superhorizon fluctuations in de Sitter and cosmological spacetimes

Worldsheet form factors in AdS/CFT

All one-loop amplitudes in N=6 Chern-Simons matter theories

(0,2) Gauge Dynamics and Flux Compactifications

Unitarity, black hole microstates and how Alices fuzzes but may not even know it

The Spectrum of Strings on Warped AdS3

Moduli Stabilization and Holographic RG

Chern-Simons Contact Terms

Bootstrapping CFTs with the Extremal Functional Method

3 point functions in the AdS4/CFT3 correspondence

Anomaly-induced transport and thermodynamics

A monodromy defect in the 3d Ising model.

Superhorizon fluctuations in de Sitter and cosmological spacetimes

Worldsheet form factors in AdS/CFT

All one-loop amplitudes in N=6 Chern-Simons matter theories

(0,2) Gauge Dynamics and Flux Compactifications

Unitarity, black hole microstates and how Alices fuzzes but may not even know it

The Spectrum of Strings on Warped AdS3

Moduli Stabilization and Holographic RG

Chern-Simons Contact Terms

Bootstrapping CFTs with the Extremal Functional Method

3 point functions in the AdS4/CFT3 correspondence

Anomaly-induced transport and thermodynamics