Interacting Dark Energy

Lead Research Organisation: University of Portsmouth
Department Name: Institute of Cosmology and Gravitation


Many cosmological models proposing an alternative to the cosmological constant have been analysed and compared with observational data, ranging from quintessence scalar field models in General Relativity to models based on modified theories of gravity. A less explored possibility is that dark energy (DE) interacts with dark matter (DM).

In this project we will build new interacting DE-DM models, in particular (at least initially) focusing on the case where DE is represented by a simple vacuum, assuming therefore that all the modifications of the standard LCDM model come from the interaction itself, following a phenomenological approach.

A first phase will be dedicated to building and analyzing the properties of the FLRW modes with numerical and dynamical systems techniques. In a second phase we will derive the relativistic perturbation equations describing the evolution of small inhomogeneities in these models. A third phase should implement these equations in existing numerical codes, which should be modified accordingly, in order to derive observational predictions of the models and constrain them with available data.


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Hogg N (2020) Constraints on the distance duality relation with standard sirens in Journal of Cosmology and Astroparticle Physics

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Hogg Natalie B. (2020) Latest evidence for a late time vacuum-geodesic CDM interaction in Physics of the Dark Universe

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Martinelli M (2019) Constraints on the interacting vacuum-geodesic CDM scenario in Monthly Notices of the Royal Astronomical Society

Studentship Projects

Project Reference Relationship Related To Start End Student Name
ST/N504245/1 01/10/2015 30/09/2021
1998530 Studentship ST/N504245/1 01/10/2017 30/09/2021 Natalie Hogg
ST/R505018/1 01/10/2017 30/09/2021
1998530 Studentship ST/R505018/1 01/10/2017 30/09/2021 Natalie Hogg