Cosmological Vorticity in a Gravity with Quadratic Order Curvature Couplings
J. Hwang, H. Noh

TL;DR
This paper investigates how rotational cosmological perturbations evolve in gravity theories with quadratic curvature couplings, revealing that angular momentum conservation holds regardless of the specific gravity model.
Contribution
It provides a generalized analysis showing the evolution of vorticity in quadratic curvature gravity theories, independent of the particular model details.
Findings
Rotational perturbations are conserved as angular momentum.
The analysis applies broadly to various quadratic gravity theories.
The results support the robustness of angular momentum conservation in cosmology.
Abstract
We analyse the evolution of the rotational type cosmological perturbation in a gravity with general quadratic order gravitational coupling terms. The result is expressed independently of the generalized nature of the gravity theory, and is simply interpreted as a conservation of the angular momentum.
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