Quantum Fields and Strings

Displaying 421 - 432 of 732

Bootstrapping N=4 super Yang-Mills

Chris Beem University of Oxford
June 11, 2013

PIRSA:13060017
Quantum Fields and Strings
Toward a Higher-Spin Dual of Interacting Field Theories

Leopoldo Pando Zayas University of Michigan–Ann Arbor
June 11, 2013

PIRSA:13060007
Quantum Fields and Strings
Bipartite Graphs, Quivers and Gauge Theories

Yang-Hui He University of London
May 14, 2013

PIRSA:13050020
Quantum Fields and Strings
An Infalling Observer in AdS/CFT and the Information Paradox

Suvrat Raju
May 03, 2013

PIRSA:13050016
Quantum Fields and Strings
Gromov-Witten Invariants from 2D Gauge Theories

Joshua Lapan Harvard University
April 30, 2013

PIRSA:13040141
Quantum Fields and Strings
An infalling observer in AdS/CFT and the black hole information paradox

Kyriakos Papadodimas European Organization for Nuclear Research (CERN)
April 09, 2013

PIRSA:13040118
Quantum Fields and Strings
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles
April 05, 2013

PIRSA:13040031
Quantum Fields and Strings
Three-point functions: SFT, integrability, and perturbative calculations.
April 02, 2013

PIRSA:13040110
Quantum Fields and Strings
Comments on short strings and Wilson loops in AdS/CFT
March 26, 2013

PIRSA:13030111
Quantum Fields and Strings
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)
March 19, 2013

PIRSA:13030109
Quantum Fields and Strings
Large N Chern-Simons-matter theories and three dimensional bosonization

Ofer Aharony Weizmann Institute of Science
March 12, 2013

PIRSA:13030106
Quantum Fields and Strings
Thermodynamical Property of Entanglement Entropy for Excited States and Holographic Local Quench

Masahiro Nozaki University of Chicago
March 05, 2013

PIRSA:13030081
Quantum Fields and Strings

Bootstrapping N=4 super Yang-Mills

Chris Beem University of Oxford
June 11, 2013

PIRSA:13060017
Quantum Fields and Strings
I will describe recent results obtained for N=4 superconformal field
theories in four dimensions by means of the conformal bootstrap.

This talk will be related to the content of arXiv:1304.1803, as well as
some additional work in progress.
Toward a Higher-Spin Dual of Interacting Field Theories

Leopoldo Pando Zayas University of Michigan–Ann Arbor
June 11, 2013

PIRSA:13060007
Quantum Fields and Strings
We show explicitly how the exact renormalization group
equation of interacting vector models in the large N limit can be
mapped into certain higher-spin equations of motion. The equations of
motion are generalized to incorporate a multiparticle extension of the
higher-spin algebra, which reflects the "multitrace" nature of the
interactions in the dual field theory from the holographic point of view.
Bipartite Graphs, Quivers and Gauge Theories

Yang-Hui He University of London
May 14, 2013

PIRSA:13050020
Quantum Fields and Strings
We discuss how bipartite graphs on Riemann surfaces encapture a wealth of information about the physics of large classes of supersymmetric gauge theories, especially those with quiver structure and arising from the AdS/CFT context. The correspondence between the gauge theory, the underlying algebraic geometry of it space of vacua, the combinatorics of dimers and toric varieties, as well as the number theory of dessin d'enfants becomes particular intricate under this light.
An Infalling Observer in AdS/CFT and the Information Paradox

Suvrat Raju
May 03, 2013

PIRSA:13050016
Quantum Fields and Strings
We reconstruct the experience of an infalling observer using the AdS/CFT correspondence. We write operators both outside and inside the black hole in terms of CFT operators. Our construction provides a natural realization of black hole complementarity, and a way of preserving information without the need for firewalls.
Gromov-Witten Invariants from 2D Gauge Theories

Joshua Lapan Harvard University
April 30, 2013

PIRSA:13040141
Quantum Fields and Strings
It has been known for twenty years that a class of two-dimensional gauge theories are intimately connected to toric geometry, as well as to hypersurfaces or complete intersections in a toric varieties, and to generalizations thereof. Under renormalization group flow, the two-dimensional gauge theory flows to a conformal field theory that describes string propagation on the associated geometry. This provides a connection between certain quantities in the gauge theory and topological invariants of the associated geometry. In this talk, I will explain how recent results show that, for Calabi-Yau geometries, the partition function for each gauge theory computes the Kahler potential on the Kahler moduli of the associated geometry. The result is expressed in terms of a Barnes' integral and is readily evaluated in a series expansion around special points in the moduli space (e.g., large volume), providing a fairly efficient way to compute Gromov-Witten invariants of the associated geometry.
An infalling observer in AdS/CFT and the black hole information paradox

Kyriakos Papadodimas European Organization for Nuclear Research (CERN)
April 09, 2013

PIRSA:13040118
Quantum Fields and Strings
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles
April 05, 2013

PIRSA:13040031
Quantum Fields and Strings
Two-dimensional models provide for a very attractive playground being a theory imitating some of the main features of QCD. Those include the asymptotic freedom, mass gap, confinement, chiral symmetry breaking and others. Furthermore, there is a correspondence between the spectra of four-dimensional SQCD and N=(2,2) CP(N-1) sigma model which was discovered more than a decade ago. This correspondence was explained later when it was found that SQCD supports non-Abelian strings with confined monopoles. The kinks of the two-dimensional theory are the monopoles attached to the strings. Thus, analysis of two-dimensional sigma models gives a deeper insight into the four-dimensional SQCD, in particular, into its strong dynamics.

We study the BPS spectrum of the N=(2,2) CP(N-1) model with the Z_N-symmetric twisted mass terms. We focus on analysis of the "extra'' towers of states found previously and compare them to the states that can be identified in the quasiclassical domain. Exact analysis of the strong-coupling states shows that not all of them survive when passing to the weak-coupling domain. Some of the states decay on the curves of the marginal stability (CMS). Thus, most of the strong coupling states do not exist at weak coupling and cannot be classified quasiclassically. This result lifts to four dimensions. In terms of the four-dimensional theory, the "extra" states are the strong coupling dyons, while the quasiclassical bound states are the bound states of dyons and quarks.
Three-point functions: SFT, integrability, and perturbative calculations.
April 02, 2013

PIRSA:13040110
Quantum Fields and Strings
I discuss several recent efforts in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS correlation functions to direct perturbative calculations and integrability-assisted methods. I review the next-to-leading order agreement between strings and perturbation theory in the SO(6) sector, a conjectured extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the leading order; finally, I discuss the issue of equating exactly extremal and non-extremal correlators at NLO in the integrability-assisted calculation.
Comments on short strings and Wilson loops in AdS/CFT
March 26, 2013

PIRSA:13030111
Quantum Fields and Strings
In the study of the string/gauge theory duality (AdS/CFT), an important role is played by the relation between local operators and Wilson loops. Perhaps the most well known example is the relation between twist two operators and the light-like cusp Wilson loop. On the string side, the twist two operator is represented by a "long" string (GKP). In this talk I use T-duality to argue that such relation is also natural for "short" strings. I discuss some examples and present a map between the shape of a short string crossing the Poincare horizon and the shape of a corresponding Wilson loop.
Based on arXiv:1212.4886 with Arkady Tseytlin (Imperial College).
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)
March 19, 2013

PIRSA:13030109
Quantum Fields and Strings
We propose a new approach for the calculation of the spectrum of excitations of QCD flux tubes. It relies on the fact that the worldsheet theory is integrable at low energies. With this approach, energy levels can be calculated for much shorter flux tubes than was previously possible, allowing for a quantitative comparison with existing lattice data. The improved theoretical control makes it manifest that existing lattice data provides strong evidence for a new pseudoscalar particle localized on the QCD fluxtube - the worldsheet axion.
Large N Chern-Simons-matter theories and three dimensional bosonization

Ofer Aharony Weizmann Institute of Science
March 12, 2013

PIRSA:13030106
Quantum Fields and Strings
I will discuss the conformal theories of N complex scalars or fermions in 2+1 dimensions, coupled to a U(N) Chern-Simons (CS) theory at level k. In the large N limit these theories have a high-spin symmetry, and, as I will review, they are dual to Vasiliev's high-spin gravity theories on four dimensional anti-de Sitter space. Maldacena and Zhiboedov showed that the high-spin symmetry determines the 2-point and 3-point functions of these theories at large N, up to two parameters. The duality to Vasiliev's gravity suggests that there is some mapping between the CS+scalar and CS+fermion theories (when one adds a quartic coupling to the scalar theories, to flow to their "critical fixed point"). We compute explicitly the large N limit of some 2-point and 3-point functions in these theories. We show that the results match with the general results of Maldacena and Zhiboedov, and they are consistent with an equivalence between the critical theory of N scalars coupled to a U(N) CS theory at level k, and the theory of k fermions coupled to a U(k) CS theory at level (N-1/2). We conjecture that this large N equivalence may be an exact duality between the scalar and fermion theories also at finite N, thus providing a bosonization of the fermionic theory. Similar results hold for real scalars (fermions) when U(N) is replaced by O(N).
Thermodynamical Property of Entanglement Entropy for Excited States and Holographic Local Quench

Masahiro Nozaki University of Chicago
March 05, 2013

PIRSA:13030081
Quantum Fields and Strings
In this talk, we will describe our recent work. Recently, we focus on the thermodynamical property and time dependence of entanglement entropy. Using holography, we found that the entanglement entropy for a very small subsystem obeys a property which is analogous to the first law of thermodynamics when we excite the system. In relativistic setups, its effective temperature is proportional to the inverse of the subsystem size. This provides a universal relationship between the energy and the amount of quantum information. Moreover, we will propose a new holographic model of local quench and describe some results which we got by using this model. This talk is based on arXiv:1212.1164 [hep-th] and arXiv:1302.5703 [hep-th].

Title	Speaker(s)	Date	Talk Type	Info
Bootstrapping N=4 super Yang-Mills	Chris Beem	2013-06-11	Scientific Series	View details
Toward a Higher-Spin Dual of Interacting Field Theories	Leopoldo Pando Zayas	2013-06-11	Scientific Series	View details
Bipartite Graphs, Quivers and Gauge Theories	Yang-Hui He	2013-05-14	Scientific Series	View details
An Infalling Observer in AdS/CFT and the Information Paradox	Suvrat Raju	2013-05-03	Scientific Series	View details
Gromov-Witten Invariants from 2D Gauge Theories	Joshua Lapan	2013-04-30	Scientific Series	View details
An infalling observer in AdS/CFT and the black hole information paradox	Kyriakos Papadodimas	2013-04-09	Scientific Series	View details
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles		2013-04-05	Scientific Series	View details
Three-point functions: SFT, integrability, and perturbative calculations.		2013-04-02	Scientific Series	View details
Comments on short strings and Wilson loops in AdS/CFT		2013-03-26	Scientific Series	View details
Evidence for a new particle on the worldsheet of the QCD flux tube	Sergei Dubovsky	2013-03-19	Scientific Series	View details
Large N Chern-Simons-matter theories and three dimensional bosonization	Ofer Aharony	2013-03-12	Scientific Series	View details
Thermodynamical Property of Entanglement Entropy for Excited States and Holographic Local Quench	Masahiro Nozaki	2013-03-05	Scientific Series	View details

Quantum Fields and Strings

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