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| - Dark matter from the scalar sector of 3-3-1 models without exotic electric charges
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| - 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 $SU(3)_cotimes SU(3)_Lotimes U(1)_X$, 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.
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