Horndeski费米子玻色子星
Horndeski fermion-boson stars
摘要：
我们建立静态和球对称的费米子玻色子星的存在，在一个低能量的有效模型（超越）Horndeski理论。这些恒星处于平衡状态，是由标量物质和费米子物质混合而成的，它们之间只有引力相互作用。性质，如质量，半径和紧凑性进行了研究，突出了两个家庭的配置定义的参数$c_4$的存在。这两个族具有独特的性质，尽管在某些限制下，它们都被简化为广义相对论中的对应物。最后，通过假设与广义相对论中使用的相同条件，我们找到了这些混合星的最大致密性，并确定它仍然低于所谓的布赫达尔极限。
英文摘要：
We establish the existence of static and spherically symmetric fermion-boson stars, in a low energy effective model of (beyond) Horndeski theories. These stars are in equilibrium, and are composed by a mixing of scalar and fermionic matters that only interact gravitationally one with each other. Properties such as mass, radius, and compactness are studied, highlighting the existence of two families of configurations defined by the parameter $c_4$. These families have distinctive properties, although in certain limits both are reduced to their counterparts in General Relativity. Finally, by assuming the same conditions used in General Relativity, we find the maximum compactness of these hybrid stars and determine that it remains below the so-called Buchdahl's limit.
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