LongRange Interactions Between DarkMatter Particles in a Model with a Cosmological, SpontaneouslyBroken Chiral Symmetry
Abstract
In a cosmological model with a chiral symmetry, there are two, dynamicallyrelated spinzero fields, a scalar ϕ and a pseudoscalar b. These fields have selfinteractions. Spontaneous symmetry breaking results in a very massive scalar particle with m_{ϕ}≅5×10^{11} GeV, and a nearly massless, (Goldstonelike) pseudoscalar particle with 0<m_{b}≲2.7×10^{6} eV. One or both particles can be part of dark matter. There are coherent longrange interactions (at range ~ 1/m_{b}≳10 cm), from exchange of a b particle between a pair of b particles, a pair of ϕ particles, and between a ϕ and a b. We compare the strength of potentials for the different pairs to the corresponding gravitational potentials (within the same range ~ 1/m_{b}), and show that the new force dominates between a b pair, that gravitation dominates between a ϕ pair, and that the potentials are comparable for a ϕb pair. The new interaction strength between a b pair is comparable to the gravitational interaction between a ϕ pair; its possibly greater coherent effect originates in the possibility that the number density of a very light b can be greater than that of a massive ϕ. We consider these results in the context of recent speculations concerning possible effects of special forces between darkmatter particles on certain galactic, and intergalactic, properties.
 Publication:

Modern Physics Letters A
 Pub Date:
 2005
 DOI:
 10.1142/S0217732305017329
 arXiv:
 arXiv:astroph/0501021
 Bibcode:
 2005MPLA...20.1155B
 Keywords:

 11.30.Er;
 95.35+d;
 98.80Es;
 Charge conjugation parity time reversal and other discrete symmetries;
 Astrophysics
 EPrint:
 8 pages, 1 figure. Appendix added