Speaker
Description
Cosmological observations indicate that the Universe underwent an inflationary
phase in the very early stages of evolution, which lead to its supercooled state.
Then, to again heat up the Universe and generate particles, there was a phase
of preheating and/or reheating, the exact description of which depends on the
particle physics model and the interaction Lagrangian. In contrast to this,
the preheating phase can also be explained as an effect of modified gravity, by
coupling the matter fields non-minimally to the gravity sector. In this study, we
build a relationship between the Einstein and Jordan frame Lagrangian, in order
to explain the parametric resonance effect needed for preheating. We consider
different forms of potential with a parametric resonance term in the Einstein
Frame and its correspondance to a non-trivial f(R) and conformal-like coupling
in the Jordan Frame. This study is a first step towards building an important
relationship between the two frames that will allow further investigations on the
production of primordial gravitational waves and black holes during preheating
| Field of contribution | Theory |
|---|
