Abstract
In certain circumstances, chiral (parity-violating) medium can be described hydrodynamically as a chiral fluid with microscopic quantum anomalies. Possible examples of such systems include strongly coupled quark–gluon plasma, liquid helium 3He-A, neutron stars and the Early Universe. We study first-order hydrodynamics of a chiral fluid on a vortex background and in an external magnetic field. We show that there are two previously undiscovered modes describing heat waves propagating along the vortex and magnetic field. We call them the Thermal Chiral Vortical Wave and Thermal Chiral Magnetic Wave. We also identify known gapless excitations of density (chiral vortical and chiral magnetic waves) and transverse velocity (chiral Alfvén wave). We demonstrate that the velocity of the chiral vortical wave is zero, when the full hydrodynamic framework is applied, and hence the wave is absent and the excitation reduces to the charge diffusion mode. We also comment on the frame-dependent contributions to the obtained propagation velocities.
Highlights
Understanding of the transport phenomena in chiral systems progressed a lot in recent years
Murchikova / Nuclear Physics B 919 (2017) 173–181 and mixed gauge-gravitational anomalies) can lead to macroscopic effects [1,2,3,4], such as generation of unusual electric or axial currents and propagating excitations in rotating samples as well as in external electromagnetic fields. Such phenomena are potentially observable in a wide span of physical situations, in, e.g., the Weyl/Dirac semimetals, strongly coupled quark–gluon plasma, in cold gases, superfluids and neutron stars, see Refs. [5,6] for a review
The main result of this work is the discovery of new excitation modes in chiral fluid
Summary
Understanding of the transport phenomena in chiral systems progressed a lot in recent years. Murchikova / Nuclear Physics B 919 (2017) 173–181 and mixed gauge-gravitational anomalies) can lead to macroscopic effects [1,2,3,4], such as generation of unusual electric or axial currents and propagating excitations in rotating samples as well as in external electromagnetic fields. Such phenomena are potentially observable in a wide span of physical situations, in, e.g., the Weyl/Dirac semimetals, strongly coupled quark–gluon plasma, in cold gases, superfluids and neutron stars, see Refs. The goal of our paper is to fill this gap and to identify the anomalous propagating modes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
