Noncommutative geometry and cosmology

GD Barbosa, N Pinto-Neto - Physical Review D—Particles, Fields, Gravitation …, 2004 - APS
We study some consequences of noncommutativity to homogeneous cosmologies by
introducing a deformation of the commutation relation between the minisuperspace …

Has the universe always expanded?

P Peter, N Pinto-Neto - Physical Review D, 2001 - APS
We consider a cosmological setting for which the currently expanding era is preceded by a
contracting phase; that is, we assume the Universe experienced at least one bounce. We …