2023/08/06 by Pollari Giacomo, Giacomo, Pollari
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements
paper · pdf · doi:10.48550/arxiv.2308.03145
openalex publication_date 2023/08/06 · openalex created_date 2023/08/09 · openalex updated_date 2026/07/28
In the present work we provide a cosmological description of the Palatini action with the addition of three well-known topological invariants, each of which is attached to a scalar field. As a consequence, torsion plays a central role, yielding an effective action with three dynamical scalar fields coupled to gravity subjected to the influence of a potential. A special heed will be addressed to inflation scenarios and quintom theory, although other noteworthy cases will be analyzed. Two out of three scalars can be thought as the Barbero-Immirzi scalar field coupled to the Holst and Nieh-Yan terms with a potential whereby they shape the evolution of the universe. The other field turns out to be a phantom that we couple to the inflaton that at late times holds the stage inducing a fast expansion