Attractors for multivalued semigroups and processes and applications to abstract d...
Differential equations with fractional derivatives and their applications
Attractors for multivalued semigroups and processes and applications to abstract d...
| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Fed Sao Paulo, UNIFESP, Lab Fis Teorica & Comput Cientifica, Campus Diadema, BR-09913030 Sao Paulo - Brazil
[2] INPE, Div Astrofis, BR-12227010 Sao Paulo - Brazil
[3] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 - USA
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | Physical Review D; v. 86, n. 8 OCT 1 2012. |
| Web of Science Citations: | 1 |
| Abstract | |
We study the dynamical stability of tachyacoustic cosmological models, in which primordial perturbations are generated by a shrinking sound horizon during a period of decelerating expansion. Such models represent a potential alternative to inflationary cosmology, but the phase-space behavior of tachyacoustic solutions has not previously been investigated. We numerically evaluate the dynamics of two noncanonical Lagrangians, a cuscuton-like Lagrangian and a Dirac-Born-Infeld Lagrangian, which generate a scale-invariant spectrum of perturbations. We show that the power-law background solutions in both cases are dynamical attractors. (AU) | |
| FAPESP's process: | 09/15612-6 - Signatures of non-singular quantum cosmological models in the cosmic microwave background radiation |
| Grantee: | Dennis Fernandes Alves Bessada |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |