Bumblebee field as a source of cosmological anisotropies

  title={Bumblebee field as a source of cosmological anisotropies},
  author={Roberto Vinhaes Maluf and Juliano C. S. Neves},
  journal={Journal of Cosmology and Astroparticle Physics},
  • R. V. Maluf, J. Neves
  • Published 18 May 2021
  • Physics
  • Journal of Cosmology and Astroparticle Physics
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 geometry, 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… 
Bianchi type I cosmology with a Kalb-Ramond background field
An effect of the Lorentz symmetry breaking is pointed out in the cosmological context. Using a Bianchi I geometry coupled to the Kalb–Ramond field, a consequence of the Lorentz symmetry violation is


Cosmological implications of Bumblebee vector models
The Bumblebee Model of spontaneous Lorentz symmetry breaking is explored in a cosmological context, considering a single non-zero time component for the vector field. The relevant dynamic equations
An exact Schwarzschild-like solution in a bumblebee gravity model
We have obtained an exact vacuum solution from a gravity sector contained in the minimal standard-model extension. The theoretical model assumes a Riemann spacetime coupled to the bumblebee field
Vector field models of inflation and dark energy
We consider several new classes of viable vector field alternatives to the inflaton and quintessence scalar fields. Spatial vector fields are shown to be compatible with the cosmological anisotropy
How Isotropic is the Universe?
A fundamental assumption in the standard model of cosmology is that the Universe is isotropic on large scales. Breaking this assumption leads to a set of solutions to Einstein's field equations,
The Limits on Cosmological Anisotropies and Inhomogeneities from COBE Data
Assuming that the cosmological principle holds, Maartens, Ellis, & Stoeger (MES) recently constructed a detailed scheme linking anisotropies in the cosmic background radiation (CMB) with anisotropies
Nonlinear spinor field in bianchi type-I cosmology : Inflation, isotropization, and late time acceleration
A self-consistent system of interacting nonlinear spinor and scalar fields within the scope of a Bianchi type-I cosmological model filled with perfect fluid is considered. Exact self-consistent
The dynamics of Bianchi I universes in $R^n$ cosmologies with torsion
We analyze the phase space of Bianchi I cosmologies filled by a spin fluid in the framework of -gravity with torsion using a combination of the dynamical systems approach and the 1+3 covariant
Bianchi I model: an alternative way to model the present-day Universe
Although the new era of high-precision cosmology of the cosmic microwave background (CMB) radiation improves our knowledge to understand the infant as well as the present-day Universe, it also leads
Magneto-dilatonic Bianchi I cosmology: Isotropization and singularity problems
We study the evolution of Bianchi-I spacetimes filled with a global unidirectional electromagnetic field Fμν interacting with a massless scalar dilatonic field according to the law Ψ()FμνFμν where
Local Voids as the Origin of Large-Angle Cosmic Microwave Background Anomalies. I.
We explore the large angular scale temperature anisotropies in the cosmic microwave background due to expanding homogeneous local voids at redshift z 1. A compensated spherically symmetric