Cosmological Fluctuations in Delta Gravity-Reference-Cited by-同舟云学术

Cosmological Fluctuations in Delta Gravity

Published:2023-06-30 Issue:7 Volume:9 Page:315
ISSN:2218-1997
Container-title:Universe
language:en
Short-container-title:Universe

Author:

Alfaro Jorge¹^ORCID,Rubio Carlos²^ORCID,San Martín Marco³^ORCID

Affiliation:

1. Instituto de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile

2. Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibañez, Av. Diagonal Las Torres 2640, Peñalolén, Santiago 7941169, Chile

3. Escuela de Ingeniería Mecánica, Pontificia Universidad Católica de Valparaíso, Av. Los Carrera 1567, Quilpué 2430120, Chile

Abstract

About 70% of the Universe is Dark Energy, but the physics community still does not know what it is. Delta gravity (DG) is an alternative theory of gravitation that could solve this cosmological problem. Previously, we studied the Universe’s accelerated expansion, where DG was able to explain the SNe-Ia data successfully. In this work, we computed the cosmological fluctuations in DG that give rise to the CMB through a hydrodynamic approximation. We calculated the gauge transformations for the metric and the perfect fluid to present the equations of the evolution of cosmological fluctuations. This provided the necessary equations to solve the scalar TT power spectrum in a semi-analytical way. These equations are useful for comparing the DG theory with astronomical observations and thus being able to constrain the DG cosmology.

Publisher

MDPI AG

Subject

General Physics and Astronomy

Link

https://www.mdpi.com/2218-1997/9/7/315/pdf

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