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Black hole formation from a general quadratic action for inflationary primordial fluctuations
Guillermo Ballesteros, Jose Beltran Jimenez, Mauro Pieroni
The most up to date femto- and micro-lensing constraints indicate that primordial black holes of and , respectively, may constitute a…
Non-trivial gravitational waves and structure formation phenomenology from dark energy
Jose Beltran Jimenez, Lavinia Heisenberg
The detection of the GW170817/GRB170817A event improved the constraints on the propagation speed of gravitational waves, thus placing possible variations caused by dark energy unde…
Teleparallel Palatini theories
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi Koivisto
The Palatini formalism is developed for gravitational theories in flat geometries. We focus on two particularly interesting scenarios. First, we fix the connection to be metric com…
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…