Gravity Induced Chiral Condensate Formation and the Cosmological Constant
| dc.creator | Alexander, Stephon H. S. | |
| dc.creator | Vaid, Deepak | |
| dc.date | 2006-09-10 | |
| dc.date.accessioned | 2026-07-07T07:24:14Z | |
| dc.date.available | 2026-07-07T07:24:14Z | |
| dc.description | It is well known that the covariant coupling of fermionic matter to gravity induces a four-fermion interaction. The presence of this term in a homogenous and isotropic space-time results in a BCS-like Hamiltonian and the formation of a chiral condensate with a mass gap. We calculate the gap ($Δ$) via a mean-field approximation for minimally coupled fermionic fields in a FRW background and find that it depends on the scale factor. The calculation also yields a correction to the bare cosmological constant ($Λ_0$), and a non-zero vev for $<ψ^\dagψ>$ which then behaves as a scalar field. Hence we conjecture that the presence of fermionic matter in gravity provides a natural mechanism for relaxation of the $Λ_0$ and explains the existence of a scalar field from (almost) first principles. | |
| dc.description | 19 pages, 1 figure | |
| dc.identifier | https://arxiv.org/abs/hep-th/0609066 | |
| dc.identifier | http://arxiv.org/abs/hep-th/0609066 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/116273 | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Gravity Induced Chiral Condensate Formation and the Cosmological Constant | |
| dc.type | text |