BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Evgeny Skvorstov (University of Mons) DTSTART:20221212T100000Z DTEND:20221212T110000Z DTSTAMP:20260422T212747Z UID:FHD-4/1 DESCRIPTION:Title: On simple models of AdS/CFT\nby Evgeny Skvorstov (University of Mons) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nThe canonical e xamples AdS/CFT pairs enjoy "the conservation of difficulty" principle: pe rturbative regimes on both sides of the duality do not overlap\, which so far prevented us from having an example with a complete proof/understandin g of the duality. I will discuss two simple cases where a complete proof o f AdS/CFT duality can be achieved\, not without a price to pay: phi-fourth theory and chiral higher spin gravity. Based on the first model I will al so discuss loop corrections in (A)dS\, while the usefulness of the second model is related to 3d bosonization duality.\n LOCATION:https://researchseminars.org/talk/FHD-4/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Dong-Han Yeom (Pusan National University) DTSTART:20221212T110000Z DTEND:20221212T120000Z DTSTAMP:20260422T212747Z UID:FHD-4/2 DESCRIPTION:Title: Tu nneling between multiple histories as a solution to the information loss p aradox\nby Dong-Han Yeom (Pusan National University) as part of Fronti ers of Holographic Duality-4\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/FHD-4/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Anastasia Golubtsova (JINR) DTSTART:20221212T120000Z DTEND:20221212T130000Z DTSTAMP:20260422T212747Z UID:FHD-4/3 DESCRIPTION:Title: Fi xed points of holographic RG flows in 3d N=2 supergravity\nby Anastasi a Golubtsova (JINR) as part of Frontiers of Holographic Duality-4\n\n\nAbs tract\nIn this talk I will discuss stability analysis of fixed points in h olographic RG flows. \nI will consider a simple 3d N=2 supergravity model with a dilaton and its potential. Solutions with AdS boundaries to the mo del can describe RG flows in the framework of the holographic duality. Usi ng the domain wall ansatz the equations of motion are reduced to a first order autonomous dynamical system. This allows us to analyze stability of fixed points and give information on UV/IR behaviour of the theory. It's found that the stability of certain points changes and one can observe b ifurcations in the model. I'll present holographic RG flows and find an as ymptotic behavior of the metric and dilaton\, using "coordinates" of fixed points.\n LOCATION:https://researchseminars.org/talk/FHD-4/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Mohsen Alishahiha (IPM) DTSTART:20221213T100000Z DTEND:20221213T110000Z DTSTAMP:20260422T212747Z UID:FHD-4/4 DESCRIPTION:Title: A universal approach to Krylov state and operator complexities.\nby Mohs en Alishahiha (IPM) as part of Frontiers of Holographic Duality-4\n\nAbstr act: TBA\n LOCATION:https://researchseminars.org/talk/FHD-4/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Oleg Andreev (Munich University) DTSTART:20221213T110000Z DTEND:20221213T120000Z DTSTAMP:20260422T212747Z UID:FHD-4/5 DESCRIPTION:Title: On string constructions of pentaquarks\nby Oleg Andreev (Munich Universi ty) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nI will di scuss the quark system containing of two heavy and three light quarks. In this case the Born-Oppenheimer approximation is appropriate that allows on e to consider the energy of the system as a function of a heavy quark sepa ration. I focus on the two low-lying B-O potentials. Even in this case the physics is very rich and complicated. String interactions include: reconn ection\, breaking\, and junction annihilation. I also briefly discuss some possible applications to hadron spectroscopy.\n LOCATION:https://researchseminars.org/talk/FHD-4/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Ali Hajiloi (Steklov Mathematical University\, RAS) DTSTART:20221213T120000Z DTEND:20221213T130000Z DTSTAMP:20260422T212747Z UID:FHD-4/6 DESCRIPTION:Title: Me son Excitation Time as a Probe of Holographic Critical Point\nby Ali H ajiloi (Steklov Mathematical University\, RAS) as part of Frontiers of Hol ographic Duality-4\n\n\nAbstract\nWe study the time evolution of expectati on value of Wilson loop as a non-local observable in\na strongly coupled field theory with a critical point at finite temperature and nonzero chemi cal\npotential\, which is dual to an asymptotically AdS charged black hole via gauge/gravity duality.\nDue to inject of energy into the plasma\, the temperature and a chemical potential increase to finite\nvalues and the p lasma experiences an out-of-equilibrium process. By defining meson excitat ion time\nt_ex as a time at which the meson falls into the final excited s tate\, we investigate the behavior of t_ex near the critical point as the system evolves towards the critical point. We obtain for slow\nquenches di fferent values of the dynamical critical exponent\, although for fast quen ches our result\nfor the dynamical critical exponent is in agreement with the one that is reported for studying the\nquasi-normal modes. Consequentl y\, this indicates that in this model for fast quenches and small\nvalues of interquark distances the gauge invariant Wilson loop is a good non-loca l observable to\nprobe the critical point.\n LOCATION:https://researchseminars.org/talk/FHD-4/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Ali Mollabashi (YITP) DTSTART:20221214T110000Z DTEND:20221214T120000Z DTSTAMP:20260422T212747Z UID:FHD-4/7 DESCRIPTION:Title: Ti me Scaling of Entanglement in Integrable Scale-Invariant Theories\nby Ali Mollabashi (YITP) as part of Frontiers of Holographic Duality-4\n\n\nA bstract\nIn two-dimensional conformal field theories (isotropic scale-inva riant theories)\, the time scaling of the entanglement entropy of a segmen t is fixed via conformal symmetry. I will talk about anisotropic scale- in variance between time and space. The anisotropy is parametrized by z\, the so-called dynamical critical exponent. I will show that in anisotropic in tegrable theories with z>1\, most of the entanglement is carried by slow m odes. At early times entanglement grows linearly due to the contribution o f the fast modes\, before smoothly entering a slow mode regime where it gr ows forever with t^{1/(1－\;z)}. I present numerical results for corr esponding scalar and fermion lattice models which show extremely good agre ement with our analytical results. Due to the dominance of the slow modes in these non-relativistic theories\, local quantum information is "weakly" scrambled independently of the dynamical exponent. This "weak" scrambling is stronger than its counterpart in integrable relativistic theories.\n LOCATION:https://researchseminars.org/talk/FHD-4/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Mihailo Cubrovic (University of Belgrade) DTSTART:20221214T120000Z DTEND:20221214T130000Z DTSTAMP:20260422T212747Z UID:FHD-4/8 DESCRIPTION:Title: Ch aotic string dynamics from perturbation theory to matrix models\nby Mi hailo Cubrovic (University of Belgrade) as part of Frontiers of Holographi c Duality-4\n\n\nAbstract\nWe explore the chaotic properties of string mot ion and relate them to operator growth and complexity in dual field theori es. The nonperturbative regime can be studied in the framework of the IKKT (type IIB) matrix model\, where we compute the time-ordered and out-of-ti me-ordered correlator (TOC and OTOC) and show that both have a complex str ucture: there is no factorization of TOC at long times and chaos is weak\, with no universal bounds or properties. On the other hand\, the perturbat ive semiclassical regime for a falling string in AdS black brane backgroun d (corresponding to jets in dual super Yang Mills theory) saturates the un iversal chaos bound in the bulk but not in dual gauge theory. We conclude that chaos in string motion is directly related not to OTOC but to more re fined measures of complexity in dual field theory.\n LOCATION:https://researchseminars.org/talk/FHD-4/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuya Kusuki (Caltech) DTSTART:20221214T150000Z DTEND:20221214T160000Z DTSTAMP:20260422T212747Z UID:FHD-4/9 DESCRIPTION:Title: Co nstruction of Gravity with particle & brane\nby Yuya Kusuki (Caltech) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nWe consider g ravity with branes and massive particles\, which has many unclear aspects. For example\, we do not know how to understand some problematic configura tions\, like brane self-intersections\, negative tension branes\, and spin ning particles interacting with branes. We address these issues through Ad S/BCFT. We solve a related conformal bootstrap and show that the self-inte rsection can be avoided by the black hole formation. We also reveal how to resolve the other problems in AdS/BCFT using the bootstrap.\nIn the later part\, we give the resolution of the same problems from the gravity side. For this purpose\, we develop a simple way to construct gravity with bran es and particles by cutting and pasting. The solution from this constructi on tells us how to resolve the issues from the gravity side\, which is com pletely consistent with the CFT result.\nAs a bonus\, we find a refined fo rmula for the holographic Rényi entropy\, which appears to be crucial to correctly reproduce the boundary entropy term. We also find a holographic dual of boundary primaries.\n LOCATION:https://researchseminars.org/talk/FHD-4/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Dionysios Anninos (King's College London) DTSTART:20221215T100000Z DTEND:20221215T110000Z DTSTAMP:20260422T212747Z UID:FHD-4/10 DESCRIPTION:Title: F inite Features in Holography\nby Dionysios Anninos (King's College Lon don) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nWe consi der theories of gravity where a more "finite" holographic theory is releva nt. From a Lorentzian perspective we comment on properties of gravity in t he presence of finite timelike boundaries\, and holographic realisations. Time permitting\, we also discuss Euclidean gravity on manifolds with no b oundary\, like Euclidean de Sitter.\n LOCATION:https://researchseminars.org/talk/FHD-4/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Qiang Wen (Southeast University\, Nanjing) DTSTART:20221215T110000Z DTEND:20221215T120000Z DTSTAMP:20260422T212747Z UID:FHD-4/11 DESCRIPTION:Title: I sland phase as a property of quantum state and Hilbert space\nby Qiang Wen (Southeast University\, Nanjing) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nIn this talk I will give a purely quantum informa tion perspective for the Island formula. More explicitly we show that\, in a quantum system when the state of a subset is totally encoded in the sta te of another subset\, the Hilbert space of the system will reduce\, and t he way we compute the reduced density matrix and related entropy quantitie s will also change essentially. Such reductions of the Hilbert space resul t in a new island formula in quantum systems\, which we conjecture to be t he same island formula in gravity recently proposed to rescue the unitarit y for black hole evaporation. Furthermore\, we propose a non-gravitational field theory configuration where entanglement islands emerge\, give a des cription for the entanglement structure of the island phase and propose ho w to realize the island phase in the lab.\n LOCATION:https://researchseminars.org/talk/FHD-4/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Pavel Slepov (Steklov Mathematical Institute) DTSTART:20221215T120000Z DTEND:20221215T130000Z DTSTAMP:20260422T212747Z UID:FHD-4/12 DESCRIPTION:Title: Q uarkyonic phase in holographic approach\nby Pavel Slepov (Steklov Math ematical Institute) as part of Frontiers of Holographic Duality-4\n\n\nAbs tract\nWe consider the holographic models that are supported by the Einste in action with the dilaton field and Maxwell fields. The holographic model \, arXiv:2203.12539\, describes media with non-zero temperature\, chemical potential\, spatial anisotropy and external magnetic field\, and reproduc es the expected first order phase transition for light quarks. We determin e the jumps near first order phase transition for string tension\, baryoni c density and electrical conductivity for the model. For some parameters o f anisotropy and magnetic field we find the new phase with significantly s maller values of string tension\, baryonic density and electrical conducti vity\, but this phase is still located in the confinement zone. This phase is located between the confinement/deconfinement phase transition line an d first order phase transition line in (temperature\, chemical potential) plane and can be interpreted as a quarkyonic phase.\n LOCATION:https://researchseminars.org/talk/FHD-4/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Juan Pedraza (Barcelona University) DTSTART:20221216T100000Z DTEND:20221216T110000Z DTSTAMP:20260422T212747Z UID:FHD-4/13 DESCRIPTION:Title: d e Sitter space and braneworld holography\nby Juan Pedraza (Barcelona University) as part of Frontiers of Holographic Duality-4\n\nAbstract: TBA \n LOCATION:https://researchseminars.org/talk/FHD-4/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Viktor Jahnke (GIST\, Gwangju) DTSTART:20221216T110000Z DTEND:20221216T120000Z DTSTAMP:20260422T212747Z UID:FHD-4/14 DESCRIPTION:by Viktor Jahnke (GIST\, Gwangju) as part of Frontiers of Holo graphic Duality-4\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/FHD-4/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Giuseppe Policastro (Ecole Normale Superieure) DTSTART:20221216T120000Z DTEND:20221216T130000Z DTSTAMP:20260422T212747Z UID:FHD-4/15 DESCRIPTION:Title: M atrix Quantum mechanics and quantum averaging of JT gravity\nby Giusep pe Policastro (Ecole Normale Superieure) as part of Frontiers of Holograph ic Duality-4\n\n\nAbstract\nI will discuss the matrix quantum mechanics wi th potential corresponding to an arbitrary spectral curve. This can be see n as a generalization of the duality between JT gravity and a particular m atrix integral. Using the recently developed techniques of quantum general ised hydrodynamics\, the effective theory of the eigenvalue density fluctu ations is a simple 2D free-boson BCFT on a curved background. The ensemble average over random matrices then corresponds to a quantum expectation va lue. Using this formalism we reproduce non-perturbative results for matrix integrals (the ramp and the plateau in the spectral form factor). We also compute the entanglement between eigenvalues\, matching a previous result by Hartnoll and Mazenc for the c = 1 matrix model and extending it to the general case. The hydrodynamical theory provides a clear picture of the e mergence of spacetime in two dimensional string theory. The talk is based on an upcoming paper with G. di Ubaldo.\n LOCATION:https://researchseminars.org/talk/FHD-4/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Dmitry Ageev DTSTART:20221216T130000Z DTEND:20221216T140000Z DTSTAMP:20260422T212747Z UID:FHD-4/16 DESCRIPTION:by Dmitry Ageev as part of Frontiers of Holographic Duality-4\ n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/FHD-4/16/ END:VEVENT END:VCALENDAR