活动
【DoA Colloquium】December 2nd by Antonino Marcianò (Fudan University)
Description
Title: Hybrid Inflation from Fermion Condensation
Speaker: Antonino Marcianò (Fudan University)
Abstract:
We investigate how inflation can emerge from four-fermion interactions generated by spacetime torsion, eliminating the need for additional scalar fields beyond the Standard Model. We partition
fermions in two sectors and introduce two bound fields. In the effective theory approach, once all the fermions have been integrated out, the bound fields serve as the inflaton and the auxiliary field, in analogy to the hybrid inflation and accounting for a waterfall (hybrid) mechanism. The inclusion of an axial chemical potential naturally facilitates the end of reheating. During the waterfall regime, the effective potential governing the fermion condensate supports the formation of non-topological solitons, known as Q-balls, which can be accounted for seeding primordial black holes (PBHs).
Bio:
Antonino Marcianò is currently tenured full professor at the Department of Physics of Fudan University and member of the Italian Institute of Nuclear Physics (INFN). He has been post-doctoral researcher in the USA, working at Princeton University and Dartmouth College on models for cosmological inflation and the physics of cosmic microwave background radiation, and at Aix-Marseille University on the Wilson-loop approach to quantum gravity. During his Ph.D. at Sapienza University of Rome, he focused on the non-commutative geometry approach to quantum gravity and the quantum group deformation of space-time symmetries. His research revolves on topological and out-of-equilibrium quantum field theories, including particle physics, cosmology and astrophysics, and analogue gravity applications to artificial intelligence, quantum computing and topological materials. He published so far more than 120 articles in international scientific journals of high impact factor.
Time: 14:00-15:00, 2/December, Tuesday
Venue: Room 506 (Large seminar room), Department of Astronomy
You can also access the colloquium via: https://www.koushare.com/space/329883/live
