Browsing Institutt for teoretisk astrofysikk by Author "Hammami, Amir"
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Hammami, Amir (Master thesis / Masteroppgave, 2012)Inflation is a much discussed topic within the field of cosmology; it represents a time in the history of the Universe where a very rapid, exponential expansion was taking place. This expansion is needed in order for the ...
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Hammami, Amir; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)Aims: We study the effects of letting dark matter and gas in the Universe couple to the scalar field of the symmetron model, a modified gravity theory, with varying coupling strength. We also search for a way to distinguish ...
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Brown, Iain Alastair; Hammami, Amir (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2012)We consider issues related to the conformal mapping between the Einstein and Jordan frames in f(R) cosmology. We consider the impact of the conformal transformation on the gauge of a perturbed system and show that unless ...
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Hammami, Amir; Llinares, Claudio; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)In this paper, we present the first results from implementing two scalar–tensor modified gravity theories, the symmetron and the Hu–Sawicki f(R)-gravity model, into a hydrodynamic N-body code with dark matter particles and ...
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Hammami, Amir (Doctoral thesis / Doktoravhandling, 2016)For over a hundred years Einstein’s theory of gravity has reigned supreme as the best theory for explaining how gravity functions in our Universe, however during the last 30 years the limitations of the theory have started ...
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Hammami, Amir; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)Reproduced with permission from Astronomy & Astrophysics, © ESO 2017