Europhys. Lett.
Volume 73, Number 1, January 2006
Page(s) 142 - 148
Section Geophysics, astronomy, and astrophysics
Published online 23 November 2005
Europhys. Lett., 73 (1), pp. 142-148 (2006)
DOI: 10.1209/epl/i2005-10349-x

Dark matter from the scalar sector of 3-3-1 models without exotic electric charges

S. 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 $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$, 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