Long-range interactions between dark-matter particles in a model with a cosmological, spontaneously-broken chiral symmetry
arXiv:astro-ph/0501021 · doi:10.1142/S0217732305017329
Abstract
In a cosmological model with a chiral symmetry, there are two, dynamically-related spin-zero fields, a scalar and a pseudoscalar . These fields have self-interactions. Spontaneous symmetry breaking results in a very massive scalar particle with $m_ϕ\cong 5 \times 10^{11}\GeV$, and a nearly massless, (Goldstone-like) pseudoscalar particle with $0< m_b <~ 2.7\times 10^{-6}\eV$. One or both particles can be part of dark matter. There are coherent long-range interactions (at range $\sim 1/m_b \simgt 10\cm$), from exchange of a particle between a pair of particles, a pair of particles, and between a and a . We compare the strength of potentials for the different pairs to the corresponding gravitational potentials (within the same range ), and show that the new force dominates between a b pair, that gravitation dominates between a pair, and that the potentials are comparable for a - pair. The new interaction strength between a pair is comparable to the gravitational interaction between a pair; its possibly greater coherent effect originates in the possibility that the number density of a very light can be greater than that of a massive . We consider these results in the context of recent speculations concerning possible effects of special forces between dark-matter particles on certain galactic, and inter-galactic, properties.
8 pages, 1 figure. Appendix added