%0 Journal Article %T A Dark Energy Hypothesis IV %A James Togeas %J Journal of High Energy Physics, Gravitation and Cosmology %P 45-55 %@ 2380-4335 %D 2025 %I Scientific Research Publishing %R 10.4236/jhepgc.2025.111006 %X The subject is the thermodynamics of dark matter, the Helmholtz free energy. The method of fluctuations leads to an estimate of the mass of a dark matter particle. The picture that emerges is that of a small-mass, degenerate, spinless boson. Contour integration produces dark matter equations of state. %K Dark Matter %K Helmholtz Free Energy %K Fluctuations %K Fugacity %K BE Gas and Condensate %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=138791