Kavli Affiliate: Misao Sasaki
| First 5 Authors: Stephon Alexander, Stephon Alexander, , ,
| Summary:
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).
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