Quantum resolution of the cosmological singularity without new physics

Towards a Stringy Resolution of the Cosmological Singularity

We study cosmological solutions to the low-energy effective action of heterotic string theory including possible leading order α corrections and a potential for the dilaton. We consider the possibility that including such stringy corrections can resolve the initial cosmological singularity. Since the exact form of these corrections is not known the higher-derivative terms are constructed so tha...

A Resolution of the Cosmological Singularity with Orientifolds

We propose a new cosmological scenario which resolves the conventional initial singularity problem. The space–time geometry has an unconventional time–like singularity on a lower dimensional hypersurface, with localized energy density. The natural interpretation of this singularity in string theory is that of negative tension branes, for example the orientifolds of type II string theory. Space–...

New families of singularity-free cosmological models

During the previous decade the interest for singularity-free cosmological models was supported by the publication of the first known geodesically complete perfect fluid cosmology [1]. Until then such possibility had been overlooked due to the restrictive conditions imposed by singularity theorems [2], [3]. These theorems required physically reasonable restrictions such as energy, causality and ...

Viable singularity-free f(R) gravity without a cosmological constant.

Several authors have argued that self-consistent f(R) gravity models distinct from the cold dark matter model with a cosmological constant (LambdaCDM) are almost ruled out. Confronting such claims, we present a particular two-parameter f(R) model that (a) is cosmologically viable and distinguishable from LambdaCDM, (b) is compatible with the existence of relativistic stars, (c) is free of singu...

Singularity resolution from polymer quantum matter