Complex Scalar Field Dark Matter

Details Complex Scalar Field Dark Matter Complex Scalar Field Dark Matter

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2049u&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

In this proceeding we show that a model in wich the dark matter of the Universe is modeled by a complex scalar field Φ endowed with a scalar potential U(|Φ |2 ) = U0 <=ft[ {\cosh (λ √ {κ 0 } √ {Φ Φ *} ) - 1} ; ] does not have exactly the same evolution equations than that of a real scalar field with the potential U(Φ ) = U0 <=ft[ {\cosh (λ √ {κ 0 Φ } ) - 1} ; ]. We find that the U(1) symmetry of the potential implies that the scalar field should be of the form Φ = σ(t)eiθ while the scalar perturbations Φ → Φ + ɸ are determined by the evolution of φR = Re(e-iθɸ). The cosmological solution is inflationary with a equation of state < ωΦ >=-1/3 and the scalar density contrast is δΦ = (2/3)δCDM. This scenario differs from that of a real scalar field.

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