洛伦兹对称性检验中的因果集和守恒律
Causal sets and conservation laws in tests of Lorentz symmetry
摘要：
许多关于洛伦兹对称性的最重要的天体物理学测试也假设所观测到的粒子的能量动量是完全守恒的。在量子引力的因果集方法中，一种特殊的洛伦兹对称性成立，但能量动量守恒可能被违反。我们表明，不正确地假设精确的守恒可以引起一个虚假的信号的洛伦兹对称性违反因果集。然而，这种虚假信号的大小比目前可以检测到的要小得多，因此目前进行的天体物理洛伦兹对称性测试是安全的，不受因果集引起的能量动量守恒的破坏。
英文摘要：
Many of the most important astrophysical tests of Lorentz symmetry also assume that energy-momentum of the observed particles is exactly conserved. In the causal set approach to quantum gravity a particular kind of Lorentz symmetry holds but energy-momentum conservation may be violated. We show that incorrectly assuming exact conservation can give rise to a spurious signal of Lorentz symmetry violation for a causal set. However, the size of this spurious signal is much smaller than can be currently detected and hence astrophysical Lorentz symmetry tests as currently performed are safe from causal set induced violations of energy-momentum conservation.
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