Einstein-Vlasov system with equal-angular momenta in $\text{AdS}_5$

TL;DR

This paper numerically constructs solutions to the five-dimensional rotating Einstein-Vlasov system with equal angular momenta in AdS space, revealing how symmetry enhancement simplifies the system and allows for equilibrium solutions with specific distribution functions.

Contribution

It introduces a new class of solutions for the 5D Einstein-Vlasov system with equal angular momenta in AdS, exploiting symmetry enhancement to reduce complexity and analyze equilibrium states.

Findings

Solutions exhibit asymptotically AdS behavior.

Distribution functions depend on conserved charges including angular momenta.

Symmetry enhancement simplifies the system to cohomogeneity-1 structure.

Abstract

We investigate solutions of the $5$--dimensional rotating Einstein-Vlasov system with an $R \times SU(2) \times U(1)$ isometry group. In a five-dimensional spacetime, there are two independent planes of rotation, thus, considering $U(1)$ symmetry on each rotation plane, we may impose an $R\times U(1) \times U(1)$ isometry to a stationary spacetime. Furthermore, when the values of the two angular momenta are equal to each other, the spatial symmetry gets enhanced to $R\times SU(2)\times U(1)$ symmetry, and the spacetime has a cohomogeneity-1 structure. Imposing the same symmetry to the distribution function of the particles of which the Vlasov system consists, the distribution function can be dependent on three mutually independent and commutative conserved charges for particle motion (energy, total angular momentum on $SU(2)$ and $U(1)$ angular momentum). We consider the distribution function which exponentially depends on the $U(1)$ angular momentum and reduces to the thermal equilibrium state in spherical symmetry. Then, in this paper, we numerically construct solutions of the asymptotically AdS Einstein--Vlasov system.