Bumblebee field as a source of cosmological anisotropies

被引：30

作者：

Maluf, R., V ^{[1
]}

Neves, Juliano C. S. ^{[2
]}

机构：

[1] Univ Fed Ceara UFC, Dept Fis, Campus Pici,CP 6030, BR-60455760 Fortaleza, Ceara, Brazil

[2] Univ Fed Alfenas, Inst Ciencia & Tecnol, Rodovia Jose Aurelio Vilela 11999, BR-37715400 Pocos De Caldas, MG, Brazil

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2021年 / 10期

关键词：

cosmology of theories beyond the SM; modified gravity; MODEL; SINGULARITY; LIMITS;

D O I：

10.1088/1475-7516/2021/10/038

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work, a bumblebee field is adopted in order to generate cosmological anisotropies. For that purpose, we assume a Bianchi I cosmology, as the background geom-etry, and a bumblebee field coupled to it. Bumblebee models are examples of a mechanism for the Lorentz symmetry violation by assuming a nonzero vacuum expectation value for the bumblebee field. When coupled to the Bianchi I geometry, which is not in agreement with a cosmological principle, the bumblebee field plays the role of a source of anisotropies and produces a preferred axis. Thus, a fraction of the cosmic anisotropies would come from the Lorentz symmetry violation. In the last part of the article, we try to assume an upper bound on the bumblebee field using the quadrupole and octopole moments of the cosmic microwave background radiation.

引用

页数：19

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