Non-minimally coupled condensate cosmologies: a phase space analysis

作者：Carloni Sante^*; Vignolo Stefano; Cianci Roberto

来源：Classical and Quantum Gravity, 2014, 31(18): 185007.

DOI：10.1088/0264-9381/31/18/185007

• fermion condensate
• cosmology
• dynamical systems approach
• dark energy
• non-minimal coupling

We present an analysis of the phase space of cosmological models based on a non-minimal coupling between the geometry and a fermionic condensate. We observe that the strong constraint coming from the Dirac equations allows a detailed design of the cosmology of these models, and at the same time guarantees an evolution towards a state indistinguishable from general relativistic cosmological models. In this light, we show in detail how the use of some specific potentials can naturally reproduce a phase of accelerated expansion. In particular, we find for the first time that an exponential potential is able to induce two de Sitter phases separated by a power law expansion, which could be an interesting model for the unification of an inflationary phase and a dark energy era.

• 出版日期2014-9-21