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Tripling Fluctuations and Peaked Sound Speed in Fermionic Matter
Hiroyuki Tajima1,2,3, Kei Iida2,4,5, Toru Kojo6
1The University of Tokyo, Department of Physics, Graduate School of Science, Tokyo 113-0033, Japan.
Abstract:
A crossover involving three-fermion clusters is relevant to the hadron-quark crossover, which, if occurring in a neutron star, could naturally reproduce the dense-matter equation of state recently deduced from simultaneous observations of neutron-star masses and radii. To understand the crossover mechanism, we examine the role of tripling fluctuations induced by the formation of three-fermion clusters. The phase-shift representation of fluctuations manifests an interplay of bound and scattering states, leading to nonmonotonic momentum distributions of baryonlike clusters and peaked sound speed at finite densities. We demonstrate them by applying our approach to a nonrelativistic system of one-dimensional three-color fermions analogous to the hadron-quark matter.
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