TY  - JOUR
N1  - This version is the version of record. For information on re-use, please refer to the publisher?s terms and conditions.
TI  - Interacting quintessence from a variational approach. I. Algebraic couplings
EP  - 22
AV  - public
Y1  - 2015/06/02/
VL  - 91
JF  - Physical Review D
KW  - Science & Technology
KW  -  Physical Sciences
KW  -  Astronomy & Astrophysics
KW  -  Physics
KW  -  Particles & Fields
KW  -  Physics
KW  -  NEWTONIAN DYNAMICS
KW  -  PERFECT
KW  -  CONSTRAINTS
KW  -  PRINCIPLE
KW  -  CONSTANT
A1  - Boehmer, CG
A1  - Tamanini, N
A1  - Wright, M
ID  - discovery10130926
N2  - 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.
SN  - 1550-2368
PB  - AMER PHYSICAL SOC
UR  - https://doi.org/10.1103/PhysRevD.91.123002
ER  -