In this talk, I would like to discuss the calculations of electric conductivity under a strong magnetic field. When the coupling constant is small enough, the perturbative approach should be useful, but the resummation is indispensable for the electric conductivity. I will explicate some technical details and investigate the subtle point in connection to the chiral anomaly. That is, it is...
We study the thermodynamics and the anomalous transport properties of a massive U(1) gauge holographic model in 5 dimensions with pure gauge and mixed gauge-gravitational Chern-Simons terms]. The thermodynamics is studied by considering an expansion in the conformal dimension of the current associated to the gauge field, and the transport is studied by using Kubo formulae. This study is done...
Due to gluon splittings into quark anti-quark pairs, initial fluctuations in baryon (B), strangeness (S), and electric charge (Q) are possible in a high-energy initial condition for the Quark Gluon Plasma. We assume that the initial condition given by
TRENTO provides the gluon distribution and then we convert that into BSQ charge fluc- tuations using the newly developed ICCING code that...
Baryons in holography arise as bulk instantons of the flavor gauge fields. In this talk I will discuss how these solutions are obtained in the class of models called V-QCD (a phenomenological holographic model for QCD in the Veneziano limit). I will discuss the role of Chern-Simons terms, how bulk instanton number is related to boundary baryon charge once suitable regularity conditions are...
I will discuss our recent formulation of magnetohydrodynamics (MHD) which can be used to describe the evolution of strong magnetic fields in neutron star interiors. The approach is based on viewing MHD as a theory with a one-form global symmetry and developing an effective field theory for the hydrodynamic modes associated with this symmetry. In the regime where the local velocity and...
Solving Quantum Chromodynamics (QCD) at intermediate density and temperature is a long- standing open problem. Since the traditional methods don’t work in this region, even the precise phase structure of QCD is currently not known. The hot and dense part of the QCD phase diagram is probed in binary neutron star mergers. It is also conjectured to include a critical end point of the nuclear to...
In talk I will show how to self-consistently couple the Einstein-inflaton equations to a strongly coupled quantum field theory (QFT) as described by holography. We show that this can lead to an inflating universe, a reheating phase and finally a universe dominated by the QFT in thermal equilibrium. Special attention will be given to technical details that could be of relevance for modelling of...
Recent work has shown us a new way to think about systems with an Adler-Bell-Jackiw anomaly, such as QED: they admit a continuous global non-invertible symmetry, an example of a concept which has received much recent attention in the formal field theory literature. I will briefly review this story in an elementary way and present a new kind of non-invertible charge operator where a key role is...
In this talk, we will discuss QED at finite temperature from a hydrodynamic viewpoint. In the first part of the talk, we will discuss a holographic model which has the same 1-form symmetry structure as that of QED. In the second part of the talk, we will discuss an effective field theory which will be in the same universality class as that of QED at finite temperature. We shall also briefly...
Chirally anomalous matter is expected to exhibit novel transport phenomena arising from the interplay between quantum anomalies and electromagnetic and vortical fields. In order to study these effects in the quark-gluon plasma formed in heavy-ion collisions, it is important to develop a theory of chiral hydrodynamics which captures the anomaly and includes dissipative effects in a consistent...
We review a hydrostatic generating functional formulation of chiral hydrodynamics with a strong magnetic field. We focus on a toy model for chiral hydrodynamics with a single anomalous symmetry, in the presence of a strong axial magnetic field as presented in https://arxiv.org/abs/2012.09183. Time permitting, we comment on how to extend this formalism to the hydrodynamics of a system with ...
Hydrodynamics has been an extraordinarily useful tool in the analysis of heavy ion collisions. With a definitive signal of the chiral magnetic effect still not shown at RHIC, the community has been focused on understanding each step of the analysis in as much detail as is permitted, relaxing assumptions where necessary. Given the importance of hydrodynamic modeling it is crucially important to...
We report on our progress in implementing a new proposal for anomalous non-Abelian relativistic hydrodynamics in four and two spacetime dimensions. Models with continuous non-Abelian symmetries are ubiquitous in physics, arising in diverse settings ranging from the quark-gluon plasma to cold atomic gases and quantum spin chains.
The approach consists on the Kaluza-Klein compactification of a...
The exact form of the Wigner function of massless particles for the free Dirac field at general global thermodynamic equilibrium with rotation and acceleration can be obtained by means of an iterative solution for the two-point function in momentum space followed by a suitable analytic continuation. The latter requires a newly proposed operation on complex functions dubbed as analytic...
Several recent approaches to relativistic hydrodynamics of particles with spin will be shortly reviewed. A possible explanation of the (in)sensitivity of the obtained results to the so called pseudo-gauge transformation will be offered
I study critical behavior in a simple nonconformal holographic setting, i.e., for black holes in five dimensional Einstein-dilaton gravity, where criticality is obtained by choosing the potential of the dilaton field appropriately. In the critical limit the nonhydrodynamic modes can be solved analytically, become long-lived, and coalesce into a branch cut. This limit is one-to-one...
We investigate the hydrodynamics of systems with pseudo-spontaneously broken U(1) - symmetry and Goldstone phase relaxation. The proposed hydrodynamic framework capturing these, in principle independent, effects is tested within two concrete holographic models. We find agreement between the hydrodynamic dispersion relations and the quasi-normal modes of both holographic models. In case of an...
In this talk I will review some recent results on conductivities in anomalous hydrodynamics. In particular, I will discuss our recent paper [2212.09761] which demonstrates that when the magnetic field is treated as order one in derivatives the gauge anomaly makes no contribution to the appropriately truncated low frequency conductivity. I will also argue that there is a preferential choice for...
In conventional conductors, transport can be classified as diffusive, ballistic, or hydrodynamic, depending on the primary scattering mechanism of electrons. In this talk I will discuss the presence of a hitherto neglected transport regime in Weyl semimetals, related to the presence of chiral anomalies. In this regime the relation between the current and the electric field becomes nonlocal as...
The formulation and study of non-Hermitian PT-symmetric quantum theories has been the focus of both theoretical and experimental activity in recent years. In this talk I will present a minimal gravity dual of a non-Hermitian QFT, discuss its main features, and hopefully open up a discussion on future non-Hermitian directions.
The chiral anomaly underlies various phenomena, including dissipationless transport currents in topological systems. While many investigations have explored the chiral anomaly in various closed topological systems, much less attention has been given to exploring this anomaly in open quantum systems. By employing the non-Hermitian description of open quantum systems in this talk, I will address...
We will discuss how to construct a hydrodynamic theory compatible with the symmetries of dipole-conserving systems. After doing so, we will analyse the theory's hydrodynamic modes spectrum.