Abstract
We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP’s in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to 109 GeV. We comment on the similarities of the results in both extra-dimensional models.
Highlights
We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model
As it was the case in the RS scenario, in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to 109 GeV
This alternative possibility has only been studied in the RS model [19, 34], so here we extend the analysis of gravity-mediated FIMP DM in extra dimensions to the CW/LD scenario
Summary
The extra-dimensional coordinate has been rescaled by the length scale rc, such that y is adimensional This particular metric was first proposed in the context of Linear Dilaton (LD) models and Little String Theory In the Einstein frame, the brane action terms still have an exponential dependence e−S/3 from the dilaton field. That hnμν(x) are canonical 4-dimensional scalar fields (with dimension 1) and the adimensional χn(y) eigenfunctions depict the profile of the hnμν(x) KK-modes in the extradimension They can be computed by solving the equation of motion in the extra-dimension of the fields:. Λ is a universal scale, whereas in the CW/LD model it depends on the KK-number n
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