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The cosmological landscape - or: How a particle physicist can be misidentified as a many-worlds supporter

I will review one of the deepest puzzles of particle physics and cosmology, the cosmological constant problem.

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Since the inception of General Relativity until current observations, the understanding of vacuum energy and the observational evidence about the accelerated expansion of the Universe have featured many plot twists. This deep theoretical problem can support the radical idea of a cosmological landscape with multiple values of vacuum energy, where only some patches of cosmos can support life according to the anthropic principle. I will finally mention some weaknesses of this anthropic approach when applied to similar naturalness problems of particle physics, showing how the cosmological constant singles it out as a striking suggestion.

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Speaker:  Davide Racco (Roma Tre University)

Time: 17:00