Hello, I am a new author trying to submit my first paper. I am being asked for endorsement even under general physics (gen-ph). Could you please advise how I can proceed with my submission? Thank you.

We propose a phenomenological cosmological model in which vacuum energy is interpreted as a thermodynamic state evolving with the global temperature of the universe. An effective potential is introduced that remains approximately constant at finite temperatures, consistent with current observations of dark energy, but exhibits a logarithmic divergence as the temperature approaches absolute zero. We postulate that absolute zero is physically attainable, not as a stationary equilibrium, but as an instantaneous dynamical inversion point. At this critical point, the vacuum becomes unstable and undergoes a phase transition, converting vacuum energy into radiation and resetting the universe into a high-temperature state analogous to the Big Bang. This framework naturally leads to a cyclic cosmological scenario while preserving global energy conservation. The model reproduces standard cosmological behavior at observable scales and predicts deviations only in extreme future conditions, offering a thermodynamic interpretation of vacuum energy and cosmic acceleration.