Graviton Spectrum in Simplified Dark Matter Models with Graviton Mediators in the de Sitter Space

Universe

IonVasile Vancea¹ 

[1] Grupo de Física Teórica e Física Matemática, Departamento de Física, Universidade Federal Rural do Rio de Janeiro, Cx. Postal 23851, BR 465 Km 7, 23890-000 Seropédica-RJ, Brazil;

关键词: simplified dark matter models;    linearized gravity;    graviton spectrum;    quantum gravity in de Sitter space;   

DOI  :  10.3390/universe5010039

来源: DOAJ

【 摘 要 】

This is the second in a series of papers investigating the formulation of the simplified Dark Matter models with graviton mediators in cosmological backgrounds. We address here the crucial problem of the fundamental observable of interest, namely the graviton spectrum in an Friedmann⁻Lemaître⁻Robertson⁻Walker (FLRW) cosmological background with an arbitrary Dark Matter background component. We calculate the correction to the free graviton two-point function up to the second order in the coupling constant between the Dark Matter and the graviton in the simplified Dark Matter model with graviton mediators approach in the de Sitter space. Our result is model independent in the sense that it does not depend on the particular form of the Dark Matter fields. In addition, due to the universality of the interaction between the Dark Matter and the graviton, the result obtained here applies to the interaction between the baryonic matter and the gravitons. As an application, we discuss in detail the massive scalar Dark Matter model and calculate the first order correction to the two-point function due to two Dark Matter modes in the adiabatic regime.

【 授权许可】

Unknown