Proposal for a Constant Cosmological Constant
摘要
It is proposed that the apparent positive acceleration of the cosmological scale factor is due to the vacuum energy of an incomplete chiral phase transition in a hidden SU(2) sector. Constraints from primordial nucleosynthesis imply that the present metastable phase is in a substantially supercooled state. It is argued that massless chiral condensates can substantially enhance the possibility of supercooling, and a linear sigma model exhibiting scale invariance broken only at the quantum level is shown to accommodate the required supercooling with a reasonable choice of quartic couplings. The extensive supercooling can in principle be confirmed or rejected on the basis of interface tension measurements in lattice simulations with dynamical fermions.
引用
@article{arxiv.hep-ph/0003197,
title = {Proposal for a Constant Cosmological Constant},
author = {Haim Goldberg},
journal= {arXiv preprint arXiv:hep-ph/0003197},
year = {2009}
}
备注
12 pages, LaTeX, 1 figure; minor rewriting, references corrected, results unchanged