Chameleon fragmentation

Philippe Brax (1) , Amol Upadhye (2, 3)

1 IPHT - Institut de Physique Théorique - UMR CNRS 3681
2 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
3 ANL - Argonne National Laboratory [Lemont]

A scalar field dark energy candidate could couple to ordinary matter and photons, enabling its detection in laboratory experiments. Here we study the quantum properties of the chameleon field, one such dark energy candidate, in an "afterglow" experiment designed to produce, trap, and detect chameleon particles. In particular, we investigate the possible fragmentation of a beam of chameleon particles into multiple particle states due to the highly non-linear interaction terms in the chameleon Lagrangian. Fragmentation could weaken the constraints of an afterglow experiment by reducing the energy of the regenerated photons, but this energy reduction also provides a unique signature which could be detected by a properly-designed experiment. We show that constraints from the CHASE experiment are essentially unaffected by fragmentation for $\phi^4$ and $1/\phi$ potentials, but are weakened for steeper potentials, and we discuss possible future afterglow experiments.

Mots clés: modified gravity; particle physics - cosmology connection

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Philippe Brax, Amol Upadhye. Chameleon fragmentation. Journal of Cosmology and Astroparticle Physics, 2014, 2014, pp.018. ⟨10.1088/1475-7516/2014/02/018⟩. ⟨cea-00983454⟩