Abstract:
I will discuss a model of ultralight dark matter represented by a scalar field interacting quadratically with the fields of the Standard Model via a trace of the hydrodynamic stress-energy tensor. We will obtain estimates of the mass and coupling constant of the field with matter, within the framework of which such a model is consistent with observational data. I will show that if the phase transition of the field happens before the Big Bang Nucleosynthesis then the region of parameters allowed by observations does not intersect the region specified by experimental data of binary pulsars. In this regard, we will also consider a modified model with an effective potential which depends on the temperature of the thermal bath. In this model the emerging restrictions are naturally resolved due to the appearance of a false vacuum.
