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.
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.
Organisations
People |
ORCID iD |
| Richard Battye (Primary Supervisor) | |
| Damien Trinh (Student) |
Publications
Battye R
(2019)
Cosmologically viable generalized Einstein-aether theories
in Physical Review D
Battye R
(2017)
Cosmological perturbation theory in generalized Einstein-Aether models
in Physical Review D
Battye R
(2018)
Gravitational wave constraints on dark sector models
in Physical Review D
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 | 01/10/2015 | 31/03/2019 | Damien 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 |