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arXiv · 2301.13678

Boson mixing and flavor vacuum in the expanding Universe: a possible candidate for the dark energy

Antonio Capolupo·Aniello Quaranta
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Abstract

We analyze the boson mixing in curved spacetime and compute the expectation value of the energy-momentum tensor of bosons on the flavor vacuum in spatially flat Friedmann-Lemaitre-Robertson-Walker metrics. We show that the energy-momentum tensor of the flavor vacuum behaves as the effective energy-momentum tensor of a perfect fluid. Assuming a fixed de Sitter background, we show that the equation of state can assume values in the interval [-1, 1], and, in the flat spacetime limit has a value -1, which is the one of the dark energy. The results here presented show that vacuum of mixed bosons like neutrino super-partners, can represent a possible component of the dark energy of the Universe.

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Antonio Capolupo, Aniello Quaranta. 2023-01-31. Boson mixing and flavor vacuum in the expanding Universe: a possible candidate for the dark energy. https://doi.org/10.1016/j.physletb.2023.137889

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