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Borrajo Gutierrez, Daniel ; Ruiz Cembranos, José Alberto ; Garay Elizondo, Luis Javier ; Sánchez Velázquez, José Manuel | Springer | 2020-09-09Gravitational 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 term. The most general first order action contains derivative coupli[...]texto impreso
Ruiz Cembranos, José Alberto ; Garay Elizondo, Luis Javier ; Sánchez Velázquez, José Manuel | Springer | 2020-06-12We investigate the gravitational production of scalar dark matter particles during the inflationary and reheating epochs. The oscillatory behavior of the curvature scalarRduring the reheating phase generates two different enhancement mechanisms [...]texto impreso
Beltrán Jiménez, José ; Ruiz Cembranos, José Alberto ; Sánchez Velázquez, José Manuel | Springer | 2018-05-15We consider theories for scalar and vector _elds coupled to the energymomentum tensor. Since these _elds also carry a non-trivial energy-momentum tensor, the coupling prescription generates self-interactions. In analogy with gravity theories, we[...]
