I+D+Ihttp://hdl.handle.net/10347/2272020-05-30T19:34:43Z2020-05-30T19:34:43ZFloquet scalar dynamics in global AdSFariña Biasi, AnxoCarracedo, PabloMas Solé, JavierMusso, DanieleSerantes, Alexandrehttp://hdl.handle.net/10347/227302020-05-30T02:01:31Z2018-01-01T00:00:00ZFloquet scalar dynamics in global AdS
Fariña Biasi, Anxo; Carracedo, Pablo; Mas Solé, Javier; Musso, Daniele; Serantes, Alexandre
We study periodically driven scalar fields and the resulting geometries with global AdS asymptotics. These solutions describe the strongly coupled dynamics of dual finite-size quantum systems under a periodic driving which we interpret as Floquet condensates. They span a continuous two-parameter space that extends the linearized solutions on AdS. We map the regions of stability in the solution space. In a significant portion of the unstable subspace, two very different endpoints are reached depending upon the sign of the perturbation. Collapse into a black hole occurs for one sign. For the opposite sign instead one attains a regular solution with periodic modulation. We also construct quenches where the driving frequency and amplitude are continuously varied. Quasistatic quenches can interpolate between pure AdS and sourced solutions with time periodic vev. By suitably choosing the quasistatic path one can obtain boson stars dual to Floquet condensates at zero driving field. We characterize the adiabaticity of the quenching processes. Besides, we speculate on the possible connections of this framework with time crystals.
2018-01-01T00:00:00ZAnisotropic D3-D5 black holes with unquenched flavorsPenín Ascariz, José ManuelVázquez Ramallo, AlfonsoZoakos, Dimitrioshttp://hdl.handle.net/10347/227292020-05-30T02:01:11Z2018-01-01T00:00:00ZAnisotropic D3-D5 black holes with unquenched flavors
Penín Ascariz, José Manuel; Vázquez Ramallo, Alfonso; Zoakos, Dimitrios
We construct a black hole geometry generated by the intersection of N c color D3- branes and N f flavor D5-branes along a 2+1 dimensional subspace. Working in the Veneziano limit in which N f is large and distributing homogeneously the D5-branes in the internal space, we calculate the solution of the equations of motion of supergravity plus sources which includes the backreaction of the flavor branes. The solution is analytic and dual to a 2+1 dimensional defect in a 3+1 dimensional gauge theory, with N f massless hypermultiplets living in the defect. The smeared background we obtain can be regarded as the holographic realization of a multilayered system. We study the thermodynamics of the resulting spatially anisotropic geometry and compute the first and second order transport coefficients for perturbations propagating along the defect. We find that, in our system, the dynamics of excitations within a layer can be described by a stack of effective D2-branes.
2018-01-01T00:00:00ZCorrelations and the ridge in the Color Glass Condensate beyond the glasma graph approximationAltinoluk, TolgaArmesto Pérez, NéstorWertepny, Douglas E.http://hdl.handle.net/10347/227282020-05-30T02:01:28Z2018-01-01T00:00:00ZCorrelations and the ridge in the Color Glass Condensate beyond the glasma graph approximation
Altinoluk, Tolga; Armesto Pérez, Néstor; Wertepny, Douglas E.
We consider two-gluon production in dilute-dense collisions within the Color Glass Condensate framework, applicable to both proton-nucleus and heavy-light ion collisions. We go beyond the glasma graph approximation which is valid in the dilute-dilute limit and show the correspondence between the glasma graphs and the kT-factorized approach that we use in our calculation. We then identify the classical uncorrelated, and the Hanbury-Brown-Twiss (HBT) and Bose enhancement correlated contributions, with the Bose enhancement contribution being suppressed by the number of degrees of freedom with respect to the uncorrelated piece. We show that both the HBT and the Bose enhancement pieces survive the inclusion of higher order contributions in density and that they stem from the quadrupole piece of the two-gluon inclusive cross section. Finally, we illustrate the results using a toy model that allows a simple numerical implementation.
2018-01-01T00:00:00ZRoper resonances and quasi-normal modes of SkyrmionsAdam, ChristophHaberichter, M.Romanczukiewicz, T.Wereszczynski, Andrzejhttp://hdl.handle.net/10347/227272020-05-30T02:01:18Z2018-01-01T00:00:00ZRoper resonances and quasi-normal modes of Skyrmions
Adam, Christoph; Haberichter, M.; Romanczukiewicz, T.; Wereszczynski, Andrzej
Radial vibrations of charge one hedgehog Skyrmions in the full Skyrme model are analysed. We investigate how the properties of the lowest resonance modes (quasi normal modes) — their frequencies and widths — depend on the form of the potential (value of the pion mass as well as the addition of further potentials) and on the inclusion of the sextic term. Then we consider the inverse problem, where certain values for the frequencies and widths are imposed, and the field theoretic Skyrme model potential giving rise to them is reconstructed. This latter method allows to reproduce the physical Roper resonances, as well as further physical properties of nucleons, with high precision.
2018-01-01T00:00:00Z