Cosmological Constant

Physics Letters B

Volume 797, 10 October 2019, 134804

On the cosmological constant problem

Author links open overlay panelLucasLombriser

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Abstract

An additional variation of the Einstein-Hilbert action with respect to the Planck mass provides a constraint on the average Ricci scalar that prevents vacuum energy from gravitating. Consideration of the evolution of the inhomogeneous matter distribution in the Universe with evaluation of the averaging constraint on disconnected matter cells that ultimately form isolated gravitationally bound structures yields a backreaction effect that self-consistently produces the cosmological constant of the background. A uniform prior on our location in the formation of these isolated structures implies a mean expectation for the present cosmological constant energy density parameter of ${\mathrm{\Omega }}_{\mathrm{\Lambda }}=0.704$, giving rise to a late-time acceleration of the cosmic expansion and a coincident current energy density of matter./.../

Essa pode ser a solução para a pior discrepância entre teoria e experimento da física Posted: 02 Sep 2019 06:48 AM PDT A física possui um enorme problema chamado “constante cosmológica”: a diferença entre a previsão teórica desse parâmetro e sua medição com base em observações astronômicas é da ordem de 10^121