Numerical simulations of stellar collapse in scalar-tensor theories of gravity
Numerical simulations of stellar collapse in scalar-tensor theories of gravity
复制标题
重力标量张量理论中恒星塌陷的数值模拟
DOI：
10.1088/0264-9381/33/13/135002
复制
发表时间：
2016
影响因子：
3.5
通讯作者：
C. D. Ott
中科院分区：
文献类型：
--
作者：
Davide Gerosa;U. Sperhake;C. D. Ott
我们用数值相对论模拟了引力标量张量理论中球对称的核心塌缩和致密天体的形成。附加的标量自由度引入了传播的单极引力波模式。目前和未来引力波实验对单极标量波的探测可能构成广义相对论强场修正的确凿证据。我们使用高分辨率的激波捕捉方案和核物态方程的近似处方，使多变的和更真实的超新星前轮廓都崩塌了。最有希望的标量辐射源是坍塌成黑洞的质子中子星。在星系核心坍塌事件形成黑洞的情况下，高级LIGO可能能够在与当前太阳系和双星脉冲星测量相当的水平上对该理论的参数施加独立的约束。在允许自发标量化恒星的参数空间区域，在黑洞形成之前转变为具有突出标量毛发的构型，进一步增强了发射信号。尽管要全面研究中子星残骸自发标量化的发生，有必要对微物理进行更现实的处理，但我们推测，此类天体的形成可能会限制该理论的参数，使其超出太阳系和双星脉冲星实验的当前界限。
We present numerical-relativity simulations of spherically symmetric core collapse and compact-object formation in scalar-tensor theories of gravity. The additional scalar degree of freedom introduces a propagating monopole gravitational-wave mode. Detection of monopole scalar waves with current and future gravitational-wave experiments may constitute smoking gun evidence for strong-field modifications of general relativity. We collapse both polytropic and more realistic pre-supernova profiles using a high-resolution shock-capturing scheme and an approximate prescription for the nuclear equation of state. The most promising sources of scalar radiation are protoneutron stars collapsing to black holes. In case of a galactic core collapse event forming a black hole, Advanced LIGO may be able to place independent constraints on the parameters of the theory at a level comparable to current solar-system and binary-pulsar measurements. In the region of the parameter space admitting spontaneously scalarised stars, transition to configurations with prominent scalar hair before black-hole formation further enhances the emitted signal. Although a more realistic treatment of the microphysics is necessary to fully investigate the occurrence of spontaneous scalarisation of neutron star remnants, we speculate that formation of such objects could constrain the parameters of the theory beyond the current bounds obtained with solar-system and binary-pulsar experiments.
影响因子：
8.6
作者：
H. Dimmelmeier;C. Ott;H.-Th. Janka;A. Marek;E. Müller
通讯作者：
E. Müller