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:20260404T095455Z UID:FHD-4/1 DESCRIPTION:Title: On simple models of AdS/CFT\nby Evgeny Skvorstov (University of M ons) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nThe cano nical examples AdS/CFT pairs enjoy "the conservation of difficulty" princi ple: perturbative regimes on both sides of the duality do not overlap\, wh ich so far prevented us from having an example with a complete proof/under standing of the duality. I will discuss two simple cases where a complete proof of 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 also discuss loop corrections in (A)dS\, while the usefulness of the second model is related to 3d bosonization duality.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Dong-Han Yeom (Pusan National University) DTSTART:20221212T110000Z DTEND:20221212T120000Z DTSTAMP:20260404T095455Z UID:FHD-4/2 DESCRIPTION:Title: Tunneling between multiple histories as a solution to the information loss paradox\nby Dong-Han Yeom (Pusan National University) as part of Frontiers of Holographic Duality-4\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Anastasia Golubtsova (JINR) DTSTART:20221212T120000Z DTEND:20221212T130000Z DTSTAMP:20260404T095455Z UID:FHD-4/3 DESCRIPTION:Title: Fixed points of holographic RG flows in 3d N=2 supergravity\nby A nastasia Golubtsova (JINR) as part of Frontiers of Holographic Duality-4\n \n\nAbstract\nIn this talk I will discuss stability analysis of fixed poin ts in holographic RG flows. \nI will consider a simple 3d N=2 supergravity model with a dilaton and its potential. Solutions with AdS boundaries to the model can describe RG flows in the framework of the holographic duali ty. Using the domain wall ansatz the equations of motion are reduced to a first order autonomous dynamical system. This allows us to analyze stabil ity 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 ob serve bifurcations in the model. I'll present holographic RG flows and fin d an asymptotic behavior of the metric and dilaton\, using "coordinates" o f fixed points.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Mohsen Alishahiha (IPM) DTSTART:20221213T100000Z DTEND:20221213T110000Z DTSTAMP:20260404T095455Z UID:FHD-4/4 DESCRIPTION:Title: A universal approach to Krylov state and operator complexities.\n by Mohsen Alishahiha (IPM) as part of Frontiers of Holographic Duality-4\n \nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Oleg Andreev (Munich University) DTSTART:20221213T110000Z DTEND:20221213T120000Z DTSTAMP:20260404T095455Z UID:FHD-4/5 DESCRIPTION:Title: On string constructions of pentaquarks\nby Oleg Andreev (Munich U niversity) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nI will discuss the quark system containing of two heavy and three light quar ks. In this case the Born-Oppenheimer approximation is appropriate that al lows one to consider the energy of the system as a function of a heavy qua rk separation. I focus on the two low-lying B-O potentials. Even in this c ase the physics is very rich and complicated. String interactions include: reconnection\, breaking\, and junction annihilation. I also briefly discu ss some possible applications to hadron spectroscopy.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Ali Hajiloi (Steklov Mathematical University\, RAS) DTSTART:20221213T120000Z DTEND:20221213T130000Z DTSTAMP:20260404T095455Z UID:FHD-4/6 DESCRIPTION:Title: Meson Excitation Time as a Probe of Holographic Critical Point\nb y Ali Hajiloi (Steklov Mathematical University\, RAS) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nWe study the time evolution of ex pectation value of Wilson loop as a non-local observable in\na strongly co upled field theory with a critical point at finite temperature and nonzer o chemical\npotential\, which is dual to an asymptotically AdS charged bla ck hole via gauge/gravity duality.\nDue to inject of energy into the plasm a\, the temperature and a chemical potential increase to finite\nvalues an d the plasma experiences an out-of-equilibrium process. By defining meson excitation time\nt_ex as a time at which the meson falls into the final ex cited state\, we investigate the behavior of t_ex near the critical point as the system evolves towards the critical point. We obtain for slow\nquen ches different values of the dynamical critical exponent\, although for fa st quenches our result\nfor the dynamical critical exponent is in agreemen t with the one that is reported for studying the\nquasi-normal modes. Cons equently\, this indicates that in this model for fast quenches and small\n values of interquark distances the gauge invariant Wilson loop is a good n on-local observable to\nprobe the critical point.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Ali Mollabashi (YITP) DTSTART:20221214T110000Z DTEND:20221214T120000Z DTSTAMP:20260404T095455Z UID:FHD-4/7 DESCRIPTION:Title: Time Scaling of Entanglement in Integrable Scale-Invariant Theories\nby Ali Mollabashi (YITP) as part of Frontiers of Holographic Duality-4 \n\n\nAbstract\nIn two-dimensional conformal field theories (isotropic sca le-invariant theories)\, the time scaling of the entanglement entropy of a segment is fixed via conformal symmetry. I will talk about anisotropic sc ale- invariance between time and space. The anisotropy is parametrized by z\, the so-called dynamical critical exponent. I will show that in anisotr opic integrable theories with z>1\, most of the entanglement is carried by slow modes. At early times entanglement grows linearly due to the contrib ution of the fast modes\, before smoothly entering a slow mode regime wher e it grows forever with t^{1/(1－\;z)}. I present numerical results f or corresponding scalar and fermion lattice models which show extremely go od agreement 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" scr ambling is stronger than its counterpart in integrable relativistic theori es.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Mihailo Cubrovic (University of Belgrade) DTSTART:20221214T120000Z DTEND:20221214T130000Z DTSTAMP:20260404T095455Z UID:FHD-4/8 DESCRIPTION:Title: Chaotic string dynamics from perturbation theory to matrix models \nby Mihailo Cubrovic (University of Belgrade) as part of Frontiers of Hol ographic Duality-4\n\n\nAbstract\nWe explore the chaotic properties of str ing motion and relate them to operator growth and complexity in dual field theories. The nonperturbative regime can be studied in the framework of t he IKKT (type IIB) matrix model\, where we compute the time-ordered and ou t-of-time-ordered correlator (TOC and OTOC) and show that both have a comp lex structure: there is no factorization of TOC at long times and chaos is weak\, with no universal bounds or properties. On the other hand\, the pe rturbative semiclassical regime for a falling string in AdS black brane ba ckground (corresponding to jets in dual super Yang Mills theory) saturates the universal chaos bound in the bulk but not in dual gauge theory. We co nclude that chaos in string motion is directly related not to OTOC but to more refined measures of complexity in dual field theory.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuya Kusuki (Caltech) DTSTART:20221214T150000Z DTEND:20221214T160000Z DTSTAMP:20260404T095455Z UID:FHD-4/9 DESCRIPTION:Title: Construction of Gravity with particle & brane\nby Yuya Kusuki (Ca ltech) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nWe con sider gravity with branes and massive particles\, which has many unclear a spects. For example\, we do not know how to understand some problematic co nfigurations\, like brane self-intersections\, negative tension branes\, a nd spinning particles interacting with branes. We address these issues thr ough AdS/BCFT. We solve a related conformal bootstrap and show that the se lf-intersection can be avoided by the black hole formation. We also reveal how to resolve the other problems in AdS/BCFT using the bootstrap.\nIn th e later part\, we give the resolution of the same problems from the gravit y side. For this purpose\, we develop a simple way to construct gravity wi th branes and particles by cutting and pasting. The solution from this con struction tells us how to resolve the issues from the gravity side\, which is completely consistent with the CFT result.\nAs a bonus\, we find a ref ined formula for the holographic Rényi entropy\, which appears to be cru cial to correctly reproduce the boundary entropy term. We also find a holo graphic dual of boundary primaries.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Dionysios Anninos (King's College London) DTSTART:20221215T100000Z DTEND:20221215T110000Z DTSTAMP:20260404T095455Z UID:FHD-4/10 DESCRIPTION:Title: Finite Features in Holography\nby Dionysios Anninos (King's Coll ege London) as part of Frontiers of Holographic Duality-4\n\n\nAbstract\nW e consider theories of gravity where a more "finite" holographic theory is relevant. From a Lorentzian perspective we comment on properties of gravi ty in the presence of finite timelike boundaries\, and holographic realisa tions. Time permitting\, we also discuss Euclidean gravity on manifolds wi th no boundary\, like Euclidean de Sitter.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Qiang Wen (Southeast University\, Nanjing) DTSTART:20221215T110000Z DTEND:20221215T120000Z DTSTAMP:20260404T095455Z UID:FHD-4/11 DESCRIPTION:Title: Island phase as a property of quantum state and Hilbert space\nb y Qiang Wen (Southeast University\, Nanjing) as part of Frontiers of Holog raphic Duality-4\n\n\nAbstract\nIn this talk I will give a purely quantum information perspective for the Island formula. More explicitly we show th at\, in a quantum system when the state of a subset is totally encoded in the state of another subset\, the Hilbert space of the system will reduce\ , and the way we compute the reduced density matrix and related entropy qu antities will also change essentially. Such reductions of the Hilbert spac e result in a new island formula in quantum systems\, which we conjecture to be the same island formula in gravity recently proposed to rescue the u nitarity for black hole evaporation. Furthermore\, we propose a non-gravit ational field theory configuration where entanglement islands emerge\, giv e a description for the entanglement structure of the island phase and pro pose how to realize the island phase in the lab.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Pavel Slepov (Steklov Mathematical Institute) DTSTART:20221215T120000Z DTEND:20221215T130000Z DTSTAMP:20260404T095455Z UID:FHD-4/12 DESCRIPTION:Title: Quarkyonic phase in holographic approach\nby Pavel Slepov (Stekl ov Mathematical Institute) as part of Frontiers of Holographic Duality-4\n \n\nAbstract\nWe consider the holographic models that are supported by the Einstein action with the dilaton field and Maxwell fields. The holographi c model\, arXiv:2203.12539\, describes media with non-zero temperature\, c hemical potential\, spatial anisotropy and external magnetic field\, and r eproduces the expected first order phase transition for light quarks. We d etermine the jumps near first order phase transition for string tension\, baryonic density and electrical conductivity for the model. For some param eters of anisotropy and magnetic field we find the new phase with signific antly smaller values of string tension\, baryonic density and electrical c onductivity\, but this phase is still located in the confinement zone. Thi s phase is located between the confinement/deconfinement phase transition line and first order phase transition line in (temperature\, chemical pote ntial) plane and can be interpreted as a quarkyonic phase.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Juan Pedraza (Barcelona University) DTSTART:20221216T100000Z DTEND:20221216T110000Z DTSTAMP:20260404T095455Z UID:FHD-4/13 DESCRIPTION:Title: de Sitter space and braneworld holography\nby Juan Pedraza (Bar celona University) as part of Frontiers of Holographic Duality-4\n\nAbstra ct: TBA\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Viktor Jahnke (GIST\, Gwangju) DTSTART:20221216T110000Z DTEND:20221216T120000Z DTSTAMP:20260404T095455Z 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://stable.researchseminars.org/talk/FHD-4/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Giuseppe Policastro (Ecole Normale Superieure) DTSTART:20221216T120000Z DTEND:20221216T130000Z DTSTAMP:20260404T095455Z UID:FHD-4/15 DESCRIPTION:Title: Matrix Quantum mechanics and quantum averaging of JT gravity\nby Giuseppe Policastro (Ecole Normale Superieure) as part of Frontiers of Ho lographic Duality-4\n\n\nAbstract\nI will discuss the matrix quantum mecha nics with potential corresponding to an arbitrary spectral curve. This can be seen as a generalization of the duality between JT gravity and a parti cular matrix integral. Using the recently developed techniques of quantum generalised hydrodynamics\, the effective theory of the eigenvalue density fluctuations is a simple 2D free-boson BCFT on a curved background. The e nsemble average over random matrices then corresponds to a quantum expecta tion value. 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 o f the emergence of spacetime in two dimensional string theory. The talk is based on an upcoming paper with G. di Ubaldo.\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Dmitry Ageev DTSTART:20221216T130000Z DTEND:20221216T140000Z DTSTAMP:20260404T095455Z UID:FHD-4/16 DESCRIPTION:by Dmitry Ageev as part of Frontiers of Holographic Duality-4\ n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/FHD-4/16/ END:VEVENT END:VCALENDAR