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Dynamical synchronization and the horizon problem

Spiros Cotsakis
University of the Aegean, Greece

The cosmological horizon problem is the question why spatial domains that were never in causal contact with each other now appear as synchronized and proceeding in perfect symphony. We propose a solution to the horizon problem in which a globally synchronized isotropic early state is reached as the $omega$-limit point of a transient, inhomogeneous Mixmaster universe. We show that the $alpha$-limit set of the latter is a Kasner circle which represents a synchronized initial state of minimal entropy. Accordingly, unless the evolution is disrupted by quantum gravitational effects so that the initial state is not attained, Planck size domains emerge as causally disconnected albeit in complete synchrony, as the universe enters an isotropic state to remain so in future unison.

2022 July 01, 14:00

Faculdade de Ciências da Universidade de Lisboa (C8.6.02)
Campo Grande, 1749-016 Lisboa

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia