论文标题
用大爆炸核合成和重力男性生成来限制洛伦兹的大黄蜂矢量场
Constraining the Lorentz-Violating Bumblebee Vector Field with Big Bang Nucleosynthesis and Gravitational Baryogenesis
论文作者
论文摘要
通过保持宇宙学原理，即各向同性和均匀的宇宙，我们考虑了被称为\ textit {bumblebee}模型的矢量探测引力理论的宇宙学。在此模型中，单个Lorentz侵入时间式矢量场具有非零的真空期望值（VEV）夫妻，也向Ricci张量和标量符号。在向量场的时间演变中，我们得出了宇宙的相关动态方程，其中$β$是一个自由参数。特别是，通过采用来自大爆炸核合成（BBN）的观察数据和在Baryogenese时代的Matter-Antimantters不对称的情况下，我们对Bumblebee Pimelike vector vector Field的VEV施加了一些限制，即$ξb^2 $，以及指数参数$β$。前者和后者分别限制了洛伦兹违规的大小，以及背景洛伦兹侵入大黄蜂场的时间演变的速度。
By keeping the cosmological principle i.e., an isotropic and homogeneous universe, we consider the cosmology of a vector-tensor theory of gravitation known as the \textit{bumblebee} model. In this model a single Lorentz-violating timelike vector field with a nonzero vacuum expectation value (VEV) couples to the Ricci tensor and scalar, as well. Taking the ansatz $B(t)\sim t^β$ for the time evolution of the vector field we derive the relevant dynamic equations of the Universe, where $β$ is a free parameter. In particular, by employing observational data coming from the Big Bang Nucleosynthesis (BBN) and the matter-antimatter asymmetry in the Baryogenesis era, we impose some constraints on the VEV of the bumblebee timelike vector field i.e., $ξb^2$, and the exponent parameter $β$. The former and the latter limit the size of Lorentz violation, and the rate of the time evolution of the background Lorentz-violating bumblebee field, respectively.
