Horndeski fermion-boson stars

Understand

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.