Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for subject:( Multiuids). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of the Western Cape

1. Elmufti, Mohammed. Perturbations of dark energy models .

Degree: 2012, University of the Western Cape

The growth of structure in the Universe proceeds via the collapse of dark matter and baryons. This process is retarded by dark energy which drives an accelerated expansion of the late Universe. In this thesis we use cosmological perturbation theory to investigate structure formation for a particular class of dark energy models, i.e. interacting dark energy models. In these models there is a non-gravitational interaction between dark energy and dark matter, which alters the standard evolution (with non-interacting dark energy) of the Universe. We consider a simple form of the interaction where the energy exchange in the background is proportional to the dark energy density. We analyse the background dynamics to uncover the e ect of the interaction. Then we develop the perturbation equations that govern the evolution of density perturbations, peculiar velocities and the gravitational potential. We carefully account for the complex nature of the perturbed interaction, in particular for the momentum transfer in the dark sector. This leads to two di erent types of model, where the momentum exchange vanishes either in the dark matter rest-frame or the dark energy rest-frame. The evolution equations for the perturbations are solved numerically, to show how structure formation is altered by the interaction. Advisors/Committee Members: Maartens, Roy (advisor).

Subjects/Keywords: Cosmology; Scalar perturbations; Gauge invariant; Cosmic microwave background; Cold dark matter; Baryons; Interacting dark energy; Multiuids; Structure formation; Momentum transfer

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Elmufti, M. (2012). Perturbations of dark energy models . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/3386

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Elmufti, Mohammed. “Perturbations of dark energy models .” 2012. Thesis, University of the Western Cape. Accessed February 17, 2019. http://hdl.handle.net/11394/3386.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Elmufti, Mohammed. “Perturbations of dark energy models .” 2012. Web. 17 Feb 2019.

Vancouver:

Elmufti M. Perturbations of dark energy models . [Internet] [Thesis]. University of the Western Cape; 2012. [cited 2019 Feb 17]. Available from: http://hdl.handle.net/11394/3386.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Elmufti M. Perturbations of dark energy models . [Thesis]. University of the Western Cape; 2012. Available from: http://hdl.handle.net/11394/3386

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.