Triangle Seminars
Wednesday, 1 Feb 2017
String Fluctuations in Non-Conformal Holography
Kostya Zarembo
(NORDITA)
Abstract:
Quantum fluctuations of the string worldsheet lead to important effects in gauge-string duality. One example is the Lüscher term is the QQ-bar potential in QCD, important for matching the lattice data.
I will discuss non-conformal holography of the N=2* theory which provides a controllable setup where the effects of string fluctuations are explicitly calculable in field theory, using localization, even though the problem is intrinsically strongly-coupled. The results obtained by direct quantization of the dual string theory perfectly match the field-theory predictions, after subtle effects like dilaton coupling to the string worldsheet are properly taken into account.
Quantum fluctuations of the string worldsheet lead to important effects in gauge-string duality. One example is the Lüscher term is the QQ-bar potential in QCD, important for matching the lattice data.
I will discuss non-conformal holography of the N=2* theory which provides a controllable setup where the effects of string fluctuations are explicitly calculable in field theory, using localization, even though the problem is intrinsically strongly-coupled. The results obtained by direct quantization of the dual string theory perfectly match the field-theory predictions, after subtle effects like dilaton coupling to the string worldsheet are properly taken into account.
Posted by: KCL
Probing the black hole interior in AdS/CFT
Kyriakos Papadodimas
(CERN)
Abstract:
I will review recent developments related to the holographic
reconstruction of the black hole interior in AdS/CFT and I will discuss the implications for the black hole information paradox.
I will review recent developments related to the holographic
reconstruction of the black hole interior in AdS/CFT and I will discuss the implications for the black hole information paradox.
Posted by: KCL
Thursday, 2 Feb 2017
Localised Black Holes and Precision Holography
Jorge Santos
(DAMTP)
Abstract:
We numerically construct asymptotically global AdS_5 x S^5 black holes that are localised on the S^5. These are solutions to type IIB supergravity with S^8 horizon topology that dominate the microcanonical ensemble at small energies. At higher energies, there is a first-order phase transition to AdS_5-Schwarzschild x S^5. By the Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence, this transition is dual to spontaneously breaking the SO(6) R-symmetry of N=4 supersymmetric Yang-Mills down to SO(5). We extrapolate the location of this phase transition and compute the expectation value of a scalar operator in the low energy phase. In addition, we discuss the construction of localised black holes in type IIA, which are dual (via T-duality) to the low temperature phase of thermal 1+1 dimensional supersymmetric Yang-Mills theory on a circle.
We numerically construct asymptotically global AdS_5 x S^5 black holes that are localised on the S^5. These are solutions to type IIB supergravity with S^8 horizon topology that dominate the microcanonical ensemble at small energies. At higher energies, there is a first-order phase transition to AdS_5-Schwarzschild x S^5. By the Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence, this transition is dual to spontaneously breaking the SO(6) R-symmetry of N=4 supersymmetric Yang-Mills down to SO(5). We extrapolate the location of this phase transition and compute the expectation value of a scalar operator in the low energy phase. In addition, we discuss the construction of localised black holes in type IIA, which are dual (via T-duality) to the low temperature phase of thermal 1+1 dimensional supersymmetric Yang-Mills theory on a circle.
Posted by: IC
Particle formation and ordering in strongly correlated systems: a 1+1D model of QCD
Gabor Takacs
(Budapest U.)
Abstract:
I present the results of a study of a (1 +1 )-dimensional version of the
famous Nambu-Jona-Lasinio model of quantum chromodynamics both at zero
and at finite baryon density. For zero chemical potential, we found the
formation of fermionic (nucleons and Δ baryons) and bosonic (two-quark
mesons, six-quark deuterons) excitations, and demonstrated the existence
of a phase transition. For a finite baryon density the model has a rich
phase diagram which includes phases with a density wave and superfluid
quasi-long-range (QLR) order, as well as a phase of a baryon
Tomonaga-Luttinger liquid (strange metal).
Relevant publication:
P. Azaria, R.M. Konik, Ph. Lecheminant, T. Pálmai, G. Takács and A.M.
Tsvelik:
Particle Formation and Ordering in Strongly Correlated Fermionic
Systems: Solving a Model of Quantum Chromodynamics, Phys. Rev. D94
(2016) 045003, arXiv:1601.02979 [hep-th].
I present the results of a study of a (1 +1 )-dimensional version of the
famous Nambu-Jona-Lasinio model of quantum chromodynamics both at zero
and at finite baryon density. For zero chemical potential, we found the
formation of fermionic (nucleons and Δ baryons) and bosonic (two-quark
mesons, six-quark deuterons) excitations, and demonstrated the existence
of a phase transition. For a finite baryon density the model has a rich
phase diagram which includes phases with a density wave and superfluid
quasi-long-range (QLR) order, as well as a phase of a baryon
Tomonaga-Luttinger liquid (strange metal).
Relevant publication:
P. Azaria, R.M. Konik, Ph. Lecheminant, T. Pálmai, G. Takács and A.M.
Tsvelik:
Particle Formation and Ordering in Strongly Correlated Fermionic
Systems: Solving a Model of Quantum Chromodynamics, Phys. Rev. D94
(2016) 045003, arXiv:1601.02979 [hep-th].
Posted by: QMW