Dark Energy and Perturbations in Einstein-Aether Gravity

Lead Research Organisation: University of Manchester
Department Name: Physics and Astronomy

Abstract

We review vector-tensor theories of gravity and how they can give rise to dark energy. We see
how, even in a fairly simple model, vector fields can give rise to a period of late time accelerated
expansion in the universe. Starting from a general Lagrangian, which is quadratic in the vector
and has at most 2 derivatives, we analyse the energy-momentum tensor arising from these different
vector-tensor theories. We then study cosmological perturbations in generalized Einstein-Aether
theories and obtain expressions for the perturbed quantities arising from the energy-momentum
tensor. It was then found that a possible asymptotic form of F was that of linear Einstein-Aether.
For this simplified theory, constraints on the coefficients were found.

Publications

10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
ST/N504178/1 01/10/2015 31/03/2021
1646580 Studentship ST/N504178/1 15/09/2015 31/03/2019 Damien Khai Trinh
 
Description Talks at various conferences 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Postgraduate students
Results and Impact Talks to other researchers on the current work undergone and prospects. This has led to other possible areas of research to undertake.
Year(s) Of Engagement Activity 2016,2017,2018