Gravity with Perturbative Constraints: Dark Energy Without New Degrees of Freedom

Simple item page
dc.creatorCooney, Alan
dc.creatorDeDeo, Simon
dc.creatorPsaltis, Dimitrios
dc.date2008-11-24
dc.date2009-02-09
dc.date.accessioned2026-07-07T12:51:23Z
dc.date.available2026-07-07T12:51:23Z
dc.descriptionMajor observational efforts in the coming decade are designed to probe the equation of state of dark energy. Measuring a deviation of the equation-of-state parameter w from -1 would indicate a dark energy that cannot be represented solely by a cosmological constant. While it is commonly assumed that any implied modification to the LambdaCDM model amounts to the addition of new dynamical fields, we propose here a framework for investigating whether or not such new fields are required when cosmological observations are combined with a set of minimal assumptions about the nature of gravitational physics. In our approach, we treat the additional degrees of freedom as perturbatively constrained and calculate a number of observable quantities, such as the Hubble expansion rate and the cosmic acceleration, for a homogeneous Universe. We show that current observations place our Universe within the perturbative validity of our framework and allow for the presence of non-dynamical gravitational degrees of freedom at cosmological scales.
dc.descriptionDiscussion extended, Accepted for publication in PRD
dc.identifierhttps://arxiv.org/abs/0811.3635
dc.identifierhttp://arxiv.org/abs/0811.3635
dc.identifierPhys.Rev.D79:044033,2009
dc.identifierdoi:10.1103/PhysRevD.79.044033
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222974
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleGravity with Perturbative Constraints: Dark Energy Without New Degrees of Freedom
dc.typetext

Files

Collections

arXiv