Cosmic inflation constrains scalar dark matter

Singlet scalar dark matter in noncommutative space

In this paper, we examine the singlet scalar dark matter annihilation to becoming the Standard Model particles in the non-commutative space. In the recent decades, many candidates of dark matter have been offered,  but our information about  the nature of dark matter is still limited. There are such particle candidates as  scalar matetr, fermion, boson, gauge boson, etc.; however, they have nei...

Singlet scalar dark matter effects on Higgs boson driven inflation

A minimal candidate for dark matter is provided by a stable standard model singlet hermitian scalar field. The quantum mechanical effects of this singlet are explored in a model where the standard model Higgs boson has a large non-minimal coupling to the Ricci scalar and plays the role of the inflaton. Imposition of the slow roll inflation cosmological constraints restricts the allowed values o...

Cosmic fluctuations and dark matter from scalar field oscillations.

It is argued that scale-invariant cosmic uctuations and cosmic dark matter might originate from two di erent modes of a single scalar eld. The dynamical relaxation of a multicomponent classical scalar eld in an expanding universe excites two generic types of global modes: massless Goldstone oscillations, which lead to scale-invariant isentropic uctuations, and massive Higgs modes, which lead to...

Scalar Dark Matter candidates

We investigate the possibility that Dark Matter could be made of scalar candidates and focus, in particular, on the unusual mass range between a few MeV’s and a few GeV’s. After showing why the Lee-Weinberg limit (which usually forbids a Dark Matter mass below a few GeV’s) does not necessarily apply in the case of scalar particles, we discuss how light candidates (mdm < O(GeV) ) can satisfy bot...

Tensor Detection Severely Constrains Axion Dark Matter