Effects of torsion coupling on fermions and Bounce dynamics of the universe

• Published in: Nuclear physics. B Vol. 1014; p. 116888
• Main Authors: Davood Sadatian, S., Mohamad Reza Hosseini, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2025; Elsevier
• Subjects: Bounce dynamics; Modified gravity; Torsion coupling; Modified gravity; Bounce dynamics; Torsion coupling
• ISSN: 0550-3213
• DOI: 10.1016/j.nuclphysb.2025.116888

The influence of torsion coupling with fermions on Bounce dynamics is an intriguing area of research at the intersection of gravity, particle physics, and cosmology. While definitive answers are still elusive, there are promising theoretical indications and ongoing investigations to explore this connection. Theoretically, torsion coupling with fermions could introduce new terms into the equations governing the Bounce, potentially influencing its characteristics (i.e. a singular bouncing cosmology can be attained through the introduction of a fermion field with Bardeen-Cooper-Schrieffer (BCS) condensation at high energy scales). In this regard, we discuss the role of fermion fields in cosmology, particularly focusing on the bouncing model as a solution to the singularity problem of the Big Bang. We highlight how the coupling between spin and torsion in the Einstein-Cartan theory of gravity can prevent gravitational singularities, leading to a nonsingular bounce instead of a Big Bang. We emphasize the implications of this model for understanding the early universe and the fundamental interactions that shaped its evolution. This study also references some works that have contributed to the understanding of fermionic interactions and their cosmological significance, suggesting new subject for future research in this area.