IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Noncommutativity and Cosmic Expansion
Autor/es:
P. GONDOLO; F. MENDEZ; H. FALOMIR; J. GAMBOA
Lugar:
Santiago de Chile
Reunión:
Conferencia; Conference on Non perturbative QFT and Loewe's Fest; 2017
Institución organizadora:
Facultad de Física, Pontificia Universidad Católica de Chile, Santiago, Chile.
Resumen:
We consider two sectors of the Universe (or, alternatively, a bimetric model) described by Friedmann-Lemaître-Robertson-Walker (FLRW) metrics with scale factors $a(t)$ and $b(t)$ respectively. We induce between them an effective interaction through a deformation of the Poisson structure for an equivalent mechanical system with two degrees of freedom, whose Hamilton´s equations are numerically and perturbatively studied. It is shown that one sector appears as an effective source of density and pressure for the second one. We find that this coupling between otherwise disconnected sectors of the Universe gives rise to accelerating or periodic evolutions, depending on the value taken by the noncommutativity parameter.