The Cosmological-Acoustic Isomorphism: Dark Energy as Bogoliubov Phonon Pressure in a Superfluid Vacuum

Standard Lambda-CDM cosmology relies on mathematically isolated constructs to explain Dark Matter and Dark Energy. This paper advances a unified framework utilizing Superfluid Vacuum Theory (SVT) and ultra-light scalar Bose-Einstein Condensate (BEC) Dark Matter models. We hypothesize that the Friedmann-Lemaître-Robertson-Walker (FLRW) metric is the macroscopic hydrodynamic limit of a ubiquitous dark matter superfluid. Consequently, cosmological redshift is not merely a geometric stretching of light, but the active thermodynamic dissipation of transient optical excitations (Dark State Polaritons) across an expanding phase-coherent matrix. As radiative energy is dissipated, it is perfectly conserved and converted into outward-propagating Bogoliubov phonons. This continuous generation of vacuum phonons exerts a non-linear ponderomotive acoustic pressure (w ≈ -1), functioning as the dynamic thermodynamic sink that drives spatial expansion—thereby physically generating the effect known as Dark Energy. We outline an isomorphic experimental protocol using a Rubidium-87 BEC to empirically validate this optical-to-acoustic energy transfer.

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