Quintessence with quadratic coupling to dark matter
Christian G. BöhmerDepartment of Mathematics and Institute of Origins, University College London, London WC1E 6BT, United KingdomGabriela Caldera-CabralDepartment of Mathematics and Institute of Origins, University College London, London WC1E 6BT, United KingdomNyein ChanDepartment of Mathematics and Institute of Origins, University College London, London WC1E 6BT, United KingdomRuth LazkozFisika Teorikoa, Euskal Herriko Unibertsitatea, 48080 Bilbao, SpainRoy MaartensInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, United Kingdom
2010en
ABI
Annotatsiya
We introduce a new form of coupling between dark energy and dark matter that is quadratic in their energy densities. Then we investigate the background dynamics when dark energy is in the form of exponential quintessence. The three types of quadratic coupling all admit late-time accelerating critical points, but these are not scaling solutions. We also show that two types of coupling allow for a suitable matter era at early times and acceleration at late times, while the third type of coupling does not admit a suitable matter era.
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