修正重力中的单极辐射
Monopole radiation in modified gravity
摘要：
对广义相对论的修改通常引入标量自由度。实验的限制要求这个领域产生的“第五”力必须在高密度环境中筛选。屏蔽机制的一个重要结果是，球对称膨胀或脉动天体（如超新星或变星）的标量电荷不守恒，因此可以发射出超光速辐射。本文在广义f（R）引力模型下，计算了超新星和变星中标量辐射引起的能量损失率，其中允许物质耦合强度β远大于1。对于在我们星系的引力势下被屏蔽的模型，β辐射约束要求β < 100。
英文摘要：
Modifications to General Relativity typically introduce a scalar degree of freedom. Experimental constraints require that the "fifth" force produced by this field must be screened in high density environments. An important consequence of the screening mechanism is that the scalar charge of a spherically symmetric expanding or pulsating object, such as a supernova or variable star, is not conserved and monopole radiation can be emitted thereby. We calculate the energy loss rate due to scalar monopole radiation in supernovae and variable stars for a generalized model of f(R) gravity in which the matter coupling strength beta is allowed to be much larger than unity. For models which become screened at the gravitational potential of our galaxy, monopole radiation constraints require beta < 100.
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