An interesting idea, coupled to one of the most plausible explanations for baryon asymmetry and what came before the Big Bang, even if it may not actually be provable.
We investigate a possible resolution of the dark energy problem within a pair-universe framework, in which the Universe emerges as an entangled pair of time-reversed sectors.
In this setting, a global zero-energy condition allows vacuum energy contributions from the two sectors to cancel, alleviating the need for extreme fine-tuning. We propose that the observed dark energy does not originate from vacuum fluctuations but instead arises as an effective entanglement energy between the visible universe and its mirror counterpart.
Treating the cosmological constant as an integration constant fixed by boundary conditions rather than a fundamental parameter, we show that the cosmological equations can be formulated without explicitly introducing vacuum energy. By imposing physically motivated boundary conditions at the cosmological event horizon, we obtain an integration constant consistent with the observed dark energy density. The parallel mirror world scenario thus provides a unified framework that may simultaneously explain the origins of dark energy and dark matter.
Merab Gogberashvili, Tinatin Tsiskaridze, "Dark Energy from Entanglements with Mirror Universe" arXiv:2603.03385 (March 3, 2026) (published at 8 Physics 29 (2026)).
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