Shadow vacuum alignment and dark energy
| dc.creator | Hung, P. Q. | |
| dc.date | 2007-07-18 | |
| dc.date.accessioned | 2026-07-07T08:45:31Z | |
| dc.date.available | 2026-07-07T08:45:31Z | |
| dc.description | In a recent model of dark energy (with several phenomenological consequences), the universe is assumed to be trapped in a false vacuum with an energy density of the order of (10^{-3} eV)^4, mimicking the presently successful $ΛCDM$ scenario. This involves a new gauge group SU(2)_Z, {\em the shadow sector}, which becomes strong at a scale $Λ_Z \sim 10^{-3} eV$. The model is described by the SU(2)_Z instanton-induced potential of an axion-like scalar field, a_Z, with two degenerate vacuua. The false (metastable) vacuum appears as a result of an phenomenological (ad-hoc) soft breaking term linear in a_Z which explicitely breaks that degeneracy. In this paper, we discuss a possible dynamical origin for this soft breaking term as coming from the alignment of the vacuum along a direction in which the condensate of the shadow fermions, $<\barψ^{(Z)}_{i} i γ_{5} ψ^{(Z)}_{i}>$ which breaks spontaneously both P and CP, is non-vanishing. The present universe lives in a vacuum which violates both P and CP in the shadow SU(2)_Z sector! | |
| dc.description | RevTex, double columns, 5 pages | |
| dc.identifier | https://arxiv.org/abs/0707.2791 | |
| dc.identifier | http://arxiv.org/abs/0707.2791 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/142989 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Astrophysics | |
| dc.title | Shadow vacuum alignment and dark energy | |
| dc.type | text |