3 papers
hep-ph2020
Derivative couplings in gravitational production in the early universe
Daniel E. Borrajo Gutiérrez, Jose A. R. Cembranos, Luis J. Garay +1
Gravitational particle production in the early universe is due to the coupling of matter fields to curvature. This coupling may include derivative terms that modify the kinetic ter…
hep-ph2019
Gravitational production of scalar dark matter
Jose A. R. Cembranos, Luis J. Garay, Jose M. Sánchez Velázquez
We investigate the gravitational production of scalar dark matter particles during the inflationary and reheating epochs. The oscillatory behavior of the curvature scalar durin…
hep-th2018
On scalar and vector fields coupled to the energy-momentum tensor
Jose Beltran Jimenez, Jose A. R. Cembranos, Jose M. Sanchez Velazquez
We consider theories for scalar and vector fields coupled to the energy-momentum tensor. Since these fields also carry a non-trivial energy-momentum tensor, the coupling prescripti…