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Interacting quintessence from a variational approach. I. Algebraic couplings

Boehmer, CG; Tamanini, N; Wright, M; (2015) Interacting quintessence from a variational approach. I. Algebraic couplings. Physical Review D , 91 , Article 123002. 10.1103/PhysRevD.91.123002. Green open access

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Abstract

We present a new approach to build models of quintessence interacting with dark or baryonic matter. We use a variational approach for relativistic fluids to realize an effective description of matter fields at the Lagrangian level. The coupling is introduced directly in the action by considering a single function mixing the dynamical degrees of freedom of the theory. The resulting gravitational field equations are derived by variations with respect to the independent variables. New interesting phenomenology can be obtained at both small scales, where new screening mechanisms for scalar fields can be realized, and large scales, where one finds an original and rich class of interacting quintessence models. The background cosmology of two of these models is studied in detail using dynamical system techniques. We find a variety of interesting results: for instance, these models contain dark energy dominated late-time attractors and scaling solutions, both with early-time matter dominated epochs and a possible inflationary origin. In general this new approach provides the starting point for future in-depth studies on new interacting quintessence models.

Type: Article
Title: Interacting quintessence from a variational approach. I. Algebraic couplings
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevD.91.123002
Publisher version: https://doi.org/10.1103/PhysRevD.91.123002
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, NEWTONIAN DYNAMICS, PERFECT, CONSTRAINTS, PRINCIPLE, CONSTANT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics
URI: https://discovery.ucl.ac.uk/id/eprint/10130926
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