189 citations · 457 across the 23 of their papers we have counts for
18 papers · 1 filter
Near-Light-Cone Nonhydrodynamic Structure from Boosted Hydrodynamics
Navid Abbasi, Jewel Kumar Ghosh, Dirk H. Rischke
Hydrodynamics provides a universal description of many-body systems at long wavelengths. Its long-lived collective excitations, known as hydrodynamic modes, admit long-wavelength e…
Cumulant dynamics in finite-memory diffusion
Navid Abbasi, Xin An, Shanjin Wu
Fluctuations of conserved charges are among the main proposed signatures of the quantum chromodynamics (QCD) critical point, but their interpretation requires a dynamical descripti…
Comparison between Causal and Acausal Diffusion: a Schwinger-Keldysh Effective Field Theory Perspective
Navid Abbasi, Matthias Kaminski, Dirk H. Rischke
In Fick's time-honored theory of diffusion, the system responds instantaneously to external perturbations, resulting in acausal behavior. Maxwell-Cattaneo theory addresses this iss…
Three-point functions from a Schwinger-Keldysh effective action, resummed in derivatives
Navid Abbasi, Dirk H. Rischke
The search for the conjectured QCD critical point in heavy-ion collisions requires to account for far-from equilibrium effects as well as fluctuations, and in particular non-Gaussi…
Pole-skipping as order parameter to probe a quantum critical point
Navid Abbasi, Karl Landsteiner
The holographic system described by Einstein-Maxwell-Chern-Simons dynamics in the bulk of AdS exhibits a chiral magnetic effect and a quantum critical point. Through numerical calc…
On the correlation functions in stable first-order relativistic hydrodynamics
Navid Abbasi, Ali Davody, Sara Tahery
First-order relativistic conformal hydrodynamics in a general (hydrodynamic) frame is characterized by a shear viscosity coefficient and two UV-regulator parameters. Within a certa…
Theory of non-linear diffusion with a physical gapped mode
Navid Abbasi, Matthias Kaminski, Omid Tavakol
In a system with one conserved charge the charge diffusion is modified by non-linear self-interactions within an effective field theory (EFT) of diffusive fluctuations. We include…
Long-time tails in the SYK chain from the effective field theory with a large number of derivatives
Navid Abbasi
We study the nonlinear energy diffusion through the SYK chain in the framework of Schwinger-Keldysh effective field theory. We analytically construct the interacting effective Lagr…
Constraints on quasinormal modes and bounds for critical points from pole-skipping
Navid Abbasi, Matthias Kaminski
We consider a holographic thermal state and perturb it by a scalar operator whose associated real-time Green's function has only gapped poles. These gapped poles correspond to the…
Complexified quasinormal modes and the pole-skipping in a holographic system at finite chemical potential
Navid Abbasi, Sara Tahery
We develop a method to study coupled dynamics of gauge-invariant variables, constructed out of metric and gauge field fluctuations on the background of a AdS Reissner-Nordström…
Quantum chaos, pole-skipping and hydrodynamics in a holographic system with chiral anomaly
Navid Abbasi, Javad Tabatabaei
It is well-known that chiral anomaly can be macroscopically detected through the energy and charge transport, due to the chiral magnetic effect. On the other hand, in a holographic…
Magneto-transport in an anomalous fluid with weakly broken symmetries, in weak and strong regime
Navid Abbasi, Armin Ghazi, Farid Taghinavaz +1
We consider a general system with weakly broken time and translation symmetries. We assume the system also possesses a symmetry which is not only weakly broken, but is anoma…
Magneto-Transport in a Chiral Fluid from Kinetic Theory
Navid Abbasi, Farid Taghinavaz, Omid Tavakol
We argue that in order to study the magneto-transport in a relativistic Weyl fluid, it is needed to take into account the associated quantum corrections, namely the side-jump effec…
Hydrodynamic Excitations from Chiral Kinetic Theory and the Hydrodynamic Frames
Navid Abbasi, Kiarash Naderi, Farid Taghinavaz
In the framework of chiral kinetic theory (CKT), we consider a system of right- and left-handed Weyl fermions out of thermal equilibrium in a homogeneous weak magnetic field. We sh…
Hydrodynamic Waves in an Anomalous Charged Fluid
Navid Abbasi, Ali Davody, Kasra Hejazi +1
We study the collective excitations in a relativistic fluid with an anomalous current. In dimensions at zero chemical potential, in addition to ordinary sound modes we…
Dissipative Charged Fluid in a Magnetic Field
Navid Abbasi, Ali Davody
We study the collective excitations in a dissipative charged fluid at zero chemical potential when an external magnetic field is present. While in the absence of magnetic field, fo…
The Energy Loss of a Heavy Quark Moving Through a General Fluid Dynamical Flow
Navid Abbasi, Ali Davody
We determine the most general form of the covariant drag force exerted on a quark moving through a fluid dynamical flow. Up to first order in derivative expansion, our general form…
The Energy Loss of a Heavy Quark Moving in a Viscous Fluid
Navid Abbasi, Ali Davody
To study the rate of energy and momentum loss of a heavy quark in QGP, specifically in the hydrodynamic regime, we use fluid/gravity duality and construct a perturbative procedure…