Attractor solutions in tachyacoustic cosmology

Autor(es)

Bessada, Dennis ^{[1, 2]} ; Kinney, William H. ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Physical Review D; v. 86, n. 8 OCT 1 2012.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 09/15612-6 - Assinaturas de modelos não singulares em cosmologia quântica na radiação cósmica de fundo em micro-ondas
• Beneficiário: Dennis Fernandes Alves Bessada
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado