A quantum state for the late Universe

Abstract

We consider the quantum description of a toy model universe in which the Schwarzschild-de Sitter geometry emerges from the coherent state of a massless scalar field. Although highly idealised, this simple model allows us to find clear hints supporting the conclusion that the reaction of the de Sitter background to the presence of matter sources induces i) a modified Newtonian dynamics at galactic scales and ii) different values measured for the present Hubble parameter. Both effects stem from the conditions required to have a normalisable quantum state.

arXiv commentLaTeX, 12 pages, no figures

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Cited by in corpus (4)

• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Alleviating the cosmological constant problem from particle production
• Formation and evaporation of quantum black holes from the decoupling mechanism in quantum gravity
• Quantum analysis of the recent cosmological bounce in the comoving Hubble length