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Multifield, Multifrequency Bosonic Stars and a Stabilization Mechanism
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-06-17 , DOI: 10.1103/physrevlett.126.241105
Nicolas Sanchis-Gual 1, 2 , Fabrizio Di Giovanni 3 , Carlos Herdeiro 1 , Eugen Radu 1 , José A Font 3, 4
Affiliation  

Scalar bosonic stars (BSs) stand out as a multipurpose model of exotic compact objects. We enlarge the landscape of such (asymptotically flat, stationary, everywhere regular) objects by considering multiple fields (possibly) with different frequencies. This allows for new morphologies and a stabilization mechanism for different sorts of unstable BSs. First, any odd number of complex fields, yields a continuous family of BSs departing from the spherical, equal frequency, -BSs. As the simplest illustration, we construct the =1 BSs family, that includes several single-frequency solutions, including even parity (such as spinning BSs and a toroidal, static BS) and odd parity (a dipole BS) limits. Second, these limiting solutions are dynamically unstable, but can be stabilized by a hybrid- construction: adding a sufficiently large fundamental =0 BS of another field, with a different frequency. Evidence for this dynamical robustness is obtained by nonlinear numerical simulations of the corresponding Einstein-(complex, massive) Klein-Gordon system, both in formation and evolution scenarios, and a suggestive correlation between stability and energy distribution is observed. Similarities and differences with vector BSs are anticipated.

中文翻译:

多场、多频玻色子星和稳定机制

标量玻色子星 (BS) 作为奇异致密天体的多用途模型脱颖而出。我们通过考虑具有不同频率的多个场(可能)来扩大此类(渐近平坦的、静止的、处处规则的)物体的景观。这为不同种类的不稳定 BS提供了新的形态稳定机制。首先,任何奇数个复数场,都会产生一个连续的 BSs 族,这些 BSs 偏离球面、等频率,-BS。作为最简单的说明,我们构造=1BSs 系列,包括多种单频解决方案,包括偶校验(例如旋转 BS 和环形静态 BS)和奇校验(偶极 BS)限制。其次,这些限制解是动态不稳定的,但可以通过混合 构造:添加足够大的基本面 =0另一个领域的 BS,具有不同的频率。这种动态鲁棒性的证据是通过在形成和演化场景中对相应的爱因斯坦-(复杂的、大规模的)克莱因-戈登系统进行非线性数值模拟获得的,并且观察到稳定性和能量分布之间的暗示性相关性。与矢量 BS 的异同是可以预料的。
更新日期:2021-06-17
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