Spontaneous growth of spinor fields in gravity
Spontaneous growth of spinor fields in gravity
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重力下旋量场的自发生长
DOI：
10.1103/physrevd.98.044011
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发表时间：
2018
影响因子：
5
通讯作者：
Fethi M. Ramazanouglu
中科院分区：
文献类型：
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作者：
Fethi M. Ramazanouglu
我们证明了与重力非最小耦合的旋量场可以在有物质存在的情况下自发生长。我们根据标量张量理论中的自发标量化情景将这种现象命名为自发旋化。旋量生长的根本原因是类似于自发标化的速子的不稳定性。我们首先提出了一个速子狄拉克方程的结构，并将其纳入重力中的物质耦合。这导致零旋量溶液不稳定并导致自发生长。我们研究了产生旋量云的球对称中子星的行为。自发旋化有可能在强场中导致广义相对论的单位阶偏差，其方式与其密切相关的自发标量化类似。这使得该理论与引力波科学和中子星天体物理学特别相关。
We show that spinor fields nonminimally coupled to gravity can grow spontaneously in the presence of matter. We name this phenomenon spontaneous spinorization after the spontaneous scalarization scenario in scalar-tensor theories. Underlying reason for the growth of the spinor is an instability similar to the tachyon of spontaneous scalarization. We first present the structure of a tachyonic Dirac equation, and incorporate it into the matter coupling in gravity. This causes the zero-spinor solution to be unstable and leads to spontaneous growth. We investigate the behaviour of the resulting theory for a spherically symmetric neutron star that has grown a spinor cloud. Spontaneous spinorization has the potential to lead to order-of-unity deviations from general relativity in strong fields in a similar manner to its close relative spontaneous scalarization. This makes the theory especially relevant to gravitational wave science and neutron star astrophysics.