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arXiv 1906.09346gr-qchep-phhep-th
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稠密标量星的命运

The Fate of Dense Scalar Stars

Francesco Muia, Michele Cicoli, Katy Clough, Francisco Pedro, Fernando Quevedo, Gian Paolo Vacca

摘要:

长寿命的伪孤立子,我们统称为实标量星,在早期宇宙学的标量场理论中普遍存在。典型的例子是轴子星和模数星。利用完全广义相对论的数值模拟,包括重力的影响,我们研究了真正的标量星的命运,并发现,根据标量势,他们要么是亚稳定的或崩溃的黑洞。特别是我们发现,KKLT潜力的配置是亚稳定的,尽管潜在的不对称性,一致的晶格模拟的结果,不包括引力效应。对于$α$ -吸引子势坍缩成黑洞是可能的,在参数空间的某个区域,标量星看起来是亚稳定的,甚至在不包括引力的情况下是分散的。每一种情况都会产生不同的宇宙学意义,这些意义可能会影响引力波的随机谱。

英文摘要:

Long-lived pseudo-solitonic objects, known as oscillons/oscillatons, which we collectively call real scalar stars, are ubiquitous in early Universe cosmology of scalar field theories. Typical examples are axions stars and moduli stars. Using numerical simulations in full general relativity to include the effects of gravity, we study the fate of real scalar stars and find that depending on the scalar potential they are either meta-stable or collapse to black holes. In particular we find that for KKLT potentials the configurations are meta-stable despite the asymmetry of the potential, consistently with the results from lattice simulations that do not include gravitational effects. For $α$-attractor potentials collapse to black holes is possible in a region of the parameter space where scalar stars would instead seem to be meta-stable or even disperse without including gravity. Each case gives rise to different cosmological implications which may affect the stochastic spectrum of gravitational waves.

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