Work

Damping of gravitational waves in f(R) gravity

Year: 2025

Type: article

Abstract: We investigate the damping of gravitational waves (GW) in f ( R ) gravity by matter. By applying the kinetic theory, we examine the first-order approximation of the relativistic Boltzmann equation. In the flat spacetime, we derive the evolution equations for waves in f ( R ) gravity and demonstrate that Landau damping is absent while collision damping is present. In the Friedmann–Robertson–Walker (FRW) cosmology, we also examine the dynamical equations for the two modes. Furthermore, in the model $$f(R) = R + \alpha R^2$$ f ( R ) = R + α R 2 , we investigate the effect of the mass term on wave amplitude decay within the neutrino system. We observe that the tensor mode with $$m = 1 \, \text {eV}$$ m = 1 eV exhibits faster decay compared to other cases, while the scalar mode with $$m = 1 \, \text {eV}$$ m = 1 eV appears to suppress decay.

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-025-13940-5

Authors: Haiyuan Feng, Laiyuan Su, Rong-Jia Yang, Wei-Qiang Chen

Institutions: Southern University of Science and Technology, Hebei University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Natural Science Foundation of China, Natural Science Foundation of Hebei Province, Southern University of Science and Technology

Awards: G1772373866, G4805507645, G7677413963, G7735963190