Maximally Symmetric Boost-Invariant Solutions of the Boltzmann Equation in Foliated Geometries

Fuente: arXiv
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Main Authors: Martinez, Mauricio, Plumberg, Christopher
Format: Preprint
Published: 2025
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author Martinez, Mauricio
Plumberg, Christopher
author_facet Martinez, Mauricio
Plumberg, Christopher
contents In this work we study the relativistic kinetic theory of a boost-invariant conformal gas on a static, maximally symmetric background $dS_3\times \mathbb{R}$, considering all constant-curvature slicings of $dS_3$ - flat, spherical, or hyperbolic- and their associated symmetry groups. Using a symmetry-driven cotangent-bundle approach, we show that the isometry group of each slicing acts on phase space in such a way that only its Casimir invariants and the time-like coordinate unconstrained, so the distribution function depends solely on these quantities. This yields a unified boost-invariant exact solution of the Boltzmann equation valid for each constant-curvature foliation of $dS_3\times \mathbb{R}$. Specializing this general solution to the flat and spherical foliations reproduces the Bjorken and Gubser flows, respectively, while its restriction to the hyperbolic foliation produces a genuinely new analytic solution (`Grozdanov flow'). Hydrodynamics and free streaming emerge naturally as limiting regimes of this novel exact solution. We further comment on several relevant aspects of the new boost-invariant solution on the hyperbolic slicing and on their interpretation once mapped back to Minkowski space.
format Preprint
id arxiv_https___arxiv_org_abs_2512_06257
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Maximally Symmetric Boost-Invariant Solutions of the Boltzmann Equation in Foliated Geometries
Martinez, Mauricio
Plumberg, Christopher
High Energy Physics - Theory
Statistical Mechanics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Nuclear Theory
In this work we study the relativistic kinetic theory of a boost-invariant conformal gas on a static, maximally symmetric background $dS_3\times \mathbb{R}$, considering all constant-curvature slicings of $dS_3$ - flat, spherical, or hyperbolic- and their associated symmetry groups. Using a symmetry-driven cotangent-bundle approach, we show that the isometry group of each slicing acts on phase space in such a way that only its Casimir invariants and the time-like coordinate unconstrained, so the distribution function depends solely on these quantities. This yields a unified boost-invariant exact solution of the Boltzmann equation valid for each constant-curvature foliation of $dS_3\times \mathbb{R}$. Specializing this general solution to the flat and spherical foliations reproduces the Bjorken and Gubser flows, respectively, while its restriction to the hyperbolic foliation produces a genuinely new analytic solution (`Grozdanov flow'). Hydrodynamics and free streaming emerge naturally as limiting regimes of this novel exact solution. We further comment on several relevant aspects of the new boost-invariant solution on the hyperbolic slicing and on their interpretation once mapped back to Minkowski space.
title Maximally Symmetric Boost-Invariant Solutions of the Boltzmann Equation in Foliated Geometries
topic High Energy Physics - Theory
Statistical Mechanics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Nuclear Theory
url https://arxiv.org/abs/2512.06257