Observatorio de I+D+i UPM

Descripción
In Haro, Amorós, and Pan [Phys. Rev. D 93, 084018 (2016)] a new cosmological model is proposed with no big bang singularity in the past, though past geodesically incomplete. This model starts with an inflationary era, follows with a stiff matter dominated period and evolves to accelerated expansion in an asymptotically de Sitter regime in a realistic fashion. The big bang singularity is replaced by a directional singularity. This singularity cannot be reached by comoving observers, since it would take them an infinite proper time lapse to go back to it. On the contrary, observers with nonzero linear momentum have the singularity at finite proper time in their past, though arbitrarily large. Hence, the time lapse from the initial singularity can be as long as desired, even infinity, depending on the linear momentum of the observer. This conclusion applies to similar inflationary models. Due to the interest of these models, we address here the properties of such singularities.
Internacional	Si
JCR del ISI	Si
Título de la revista	Physical Review D
ISSN	1550-7998
Factor de impacto JCR	4,864
Información de impacto
Volumen	94
DOI	10.1103/PhysRevD.94.024049
Número de revista	2
Desde la página	024049-1
Hasta la página	024049-5
Mes	SIN MES
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• Autor: Leonardo Fernandez Jambrina (UPM)

• Creador: Departamento: Matemática e Informática Aplicadas a la Ingenierías Civil y Naval