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Observational constraints on new exact inflationary scalar-field solutions
(American Physical SocietyPhysical Review D, 2016-10-15)
An algorithm is used to generate new solutions of the scalar-field equations in homogeneous and isotropic universes. Solutions can be found for pure scalar fields with various potentials in the absence and presence of ...
Maximum magnetic moment to angular momentum conjecture
(American Physical SocietyPhysical Review D, 2017-03-24)
Conjectures play a central role in theoretical physics, especially those that assert an upper bound to some dimensionless ratio of physical quantities. In this paper we introduce a new such conjecture bounding the ratio ...
Cyclic mixmaster universes
(American Physical SocietyPhysical Review D, 2017-04-19)
We investigate the behavior of bouncing Bianchi type IX “mixmaster” universes in general relativity. This generalizes all previous studies of the cyclic behavior of closed spatially homogeneous universes with and without ...
Cosmological solutions with gravitational particle production and nonzero curvature
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-05-26)
In a homogeneous and isotropic universe with nonzero spatial curvature we consider the effects of gravitational particle production in the dynamics of the universe. We show that the dynamics of the universe in such a ...
Inhomogeneous initial data and small-field inflation
(IoPJournal of Cosmology and Astroparticle Physics, 2018-05-08)
We consider the robustness of small-field inflation in the presence of scalar field inhomo- geneities. Previous numerical work has shown that if the scalar potential is flat only over a narrow in- terval, such as in commonly ...