Dark matter from the scalar sector of 3-3-1 models without exotic electric chargesS. Filippi1, 2, W. A. Ponce3 and L. A. Sánchez1, 4
1 ICRA-International Center for Relativistic Astrophysics, Dipartimento di Fisica Università di Roma "La Sapienza" - P.le A. Moro 5, 00185 Roma, Italy
2 Università CBM - Via E. Longoni 83, 00155 Roma, Italy
3 Instituto de Física, Universidad de Antioquia - A.A. 1226, Medellín, Colombia
4 Escuela de Física, Universidad Nacional de Colombia A.A. 3840, Medellín, Colombia
received 26 August 2005; accepted in final form 25 October 2005
published online 23 November 2005
It is shown that three SU(2) singlet neutral scalars (two CP-even and one CP-odd) in the spectrum of models based on the gauge symmetry , which do not contain exotic electric charges, are realistic candidates for thermally generated self-interacting dark matter in the Universe, a type of dark matter that has been recently proposed in order to overcome some difficulties of collisionless cold-dark-matter models at the galactic scale. These candidates arise without introducing a new mass scale in the model and/or without the need for a discrete symmetry to stabilize them, but at the expense of tuning several combinations of parameters of the scalar potential.
95.35.+d - Dark matter (stellar, interstellar, galactic and cosmological).
12.60.Fr - Extensions of the electroweak Higgs sector.
14.80.Cp - Non-standard model Higgs bosons.
© EDP Sciences 2005