标题： 非平凡的闵可夫斯基背景在f(T)引力中 显示英文标题

标题： Non-trivial Minkowski backgrounds in f(T) gravity

摘要： 在闵可夫斯基空间中研究了增强和旋转的四维背景，这是$f(T)$引力中的情况。 我们首先在非平凡背景下进行一阶洛伦兹扰动，并表明某些洛伦兹模式可以表现出非平凡的动力学并在时间中传播。 这一显著特性为洛伦兹部分中的额外模式提供了证据，这些模式在洛伦兹破坏的修改引力中没有先例，然而它们可能会对这些模型的理论可行性产生怀疑。 显示英文摘要

摘要： Boosted and rotated tetrad backgrounds for the Minkowski space are studied in $f(T)$ gravity. We perform Lorentzian perturbations at first order around non-trivial backgrounds and show that some Lorentz modes can exhibit non-trivial dynamics and can propagate in time. This remarkable feature gives evidence of additional mode(s) in the Lorentzian sector which have no precedent in Lorentz-violating modified gravities, however they can cast doubts onto even theoretical viability of these models.