TY  - JOUR
AU  - Simpson, F.
AU  - Jimenez, R.
AU  - Pena-Garay, C.
AU  - Verde, L.
PY  - 2018
DA  - 2018//
TI  - Dark energy from the motions of neutrinos
T2  - Phys. Dark Universe
JO  - Physics of the Dark Universe
SP  - 72
EP  - 77
VL  - 20
PB  - Elsevier Science Bv
KW  - Neutrinos
KW  - Dark energy
KW  - Interactions in the dark sector
AB  - Ordinarily, a scalar field may only play the role of dark energy if it possesses a potential that is either extraordinarily flat or extremely fine-tuned. Here we demonstrate that these restrictions are lifted when the scalar field undergoes persistent energy exchange with another fluid. In this scenario, the field is prevented from reversing its direction of motion, and instead may come to rest while displaced from the local minimum of its potential. Therefore almost any scalar potential is capable of initiating a prolonged phase of cosmic acceleration. If the rate of energy transfer is modulated via a derivative coupling, the field undergoes a rapid process of freezing, after which the field's equation of state mimicks that of a cosmological constant. We present a physically motivated realisation in the form of a neutrino-majoron coupling, which avoids the dynamical instabilities associated with mass-varying neutrino models. Finally we discuss possible means by which this model could be experimentally verified.
SN  - 2212-6864
UR  - http://arxiv.org/abs/1607.02515
UR  - https://doi.org/10.1016/j.dark.2018.04.002
DO  - 10.1016/j.dark.2018.04.002
LA  - English
N1  - WOS:000433904300009
ID  - Simpson_etal2018
ER  -