Stable spontaneously-scalarized black holes in generalized scalar-tensor theories

Stable spontaneously-scalarized black holes in generalized scalar-tensor theories
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广义标量张量理论中的稳定自发标量黑洞

DOI:
10.1103/physrevd.106.024029
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发表时间:
2022
期刊:
影响因子:
5
通讯作者:
Antoniou G
Antoniou G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Antoniou G

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研究表明,标量场与Ricci标量和Gauss-Bonnet不变量耦合的协同作用会显著影响标量化黑洞和中子星的性质,包括它们的存在域和它们携带的标量头发的数量。在这里,我们研究标度化黑洞解的径向稳定性。我们证明,他们是稳定的,对径向扰动的Ricci耦合一致的晚时间的宇宙吸引子和逃避二进制脉冲星的约束。此外,我们调查的Ricci耦合的双曲性方程的线性,径向扰动的影响,并表明,它显着减少了双曲性丢失的区域。
It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black holes and neutron stars, including their domain of existence and the amount of scalar hair they carry. Here we study the radial stability of scalarized black-hole solutions. We demonstrate that they are stable against radial perturbations for Ricci couplings consistent with both a late-time cosmological attractor and the evasion of binary pulsar constraints. In addition, we investigate the effect of the Ricci coupling on the hyperbolicity of the equation governing linear, radial perturbations and show that it significantly reduces the region over which hyperbolicity is lost.
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