论文标题
在有效的修改重力理论中，洛伦兹对称性违反了对称性
Lorentz Symmetry Violation in String-Inspired Effective Modified Gravity Theories
论文作者
论文摘要
我们讨论在有效的重力场理论中违反洛伦兹对称性的情况，在弦的低能限制中产生。特别是，我们讨论了系统基态对对称性的自发侵犯。在平坦的时空极限中，破碎的洛伦兹对称性的有效理论获得了属于所谓的标准模型扩展（SME）形式主义的一般框架的形式。在我们继续描述一个具体示例之前，对这种形式主义进行了简要审查，在其中讨论了洛伦兹对称性侵入（LV）弦乐启发的宇宙学模型。该模型是一种引力场理论，与物质结合，其中包含扭转，这是由基本弦理论的基本自由度产生的。后者在我们应指定的某些条件下，可以获取LV冷凝物，并通过适当的运动方程式获得违反Lorentz和CPT（电荷 - 超级时间 - 反转）对称性的解决方案。该模型由中小企业有效理论的特定形式描述，特定的LV和CPT对称违反系数，该系数取决于基础弦理论的显微镜参数，因此可以受到当前时代现象学的界定。
We discuss situations under which Lorentz symmetry is violated in effective gravitational field theories that arise in the low-energy limit of strings. In particular, we discuss spontaneous violation of the symmetry by the ground state of the system. In the flat space-time limit, the effective theory of the broken Lorentz Symmetry acquires a form that belongs to the general framework of the so-called Standard Model Extension (SME) formalism. A brief review of this formalism is given before we proceed to describe a concrete example, where we discuss a Lorentz-symmetry-Violating (LV) string-inspired cosmological model. The model is a gravitational field theory coupled to matter, which contains torsion, arising from the fundamental degrees of freedom of the underlying string theory. The latter, under certain conditions which we shall specify, can acquire a LV condensate, and lead, via the appropriate equations of motion, to solutions that violate Lorentz and CPT (Charge-Parity-Time-Reversal) symmetry. The model is described by a specific form of an SME effective theory, with specific LV and CPT symmetry Violating coefficients, which depend on the microscopic parameters of the underlying string theory, and thus can be bounded by current-era phenomenology.
