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Galaxy formation efficiency and the multiverse explanation of the cosmological constant with EAGLE simulations.

Barnes, L. A. and Elahi, P. J. and Salcido, J. and Bower, R. G. and Lewis, G. F. and Theuns, T. and Schaller, M. and Crain, R. A. and Schaye, J. (2018) 'Galaxy formation efficiency and the multiverse explanation of the cosmological constant with EAGLE simulations.', Monthly notices of the Royal Astronomical Society., 477 (3). pp. 3727-3743.


Models of the very early Universe, including inflationary models, are argued to produce varying universe domains with different values of fundamental constants and cosmic parameters. Using the cosmological hydrodynamical simulation code from the EAGLE collaboration, we investigate the effect of the cosmological constant on the formation of galaxies and stars. We simulate universes with values of the cosmological constant ranging from Λ = 0 to Λ0 × 300, where Λ0 is the value of the cosmological constant in our Universe. Because the global star formation rate in our Universe peaks at t = 3.5 Gyr, before the onset of accelerating expansion, increases in Λ of even an order of magnitude have only a small effect on the star formation history and efficiency of the universe. We use our simulations to predict the observed value of the cosmological constant, given a measure of the multiverse. Whether the cosmological constant is successfully predicted depends crucially on the measure. The impact of the cosmological constant on the formation of structure in the universe does not seem to be a sharp enough function of Λ to explain its observed value alone.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:29 March 2018
Date deposited:16 May 2018
Date of first online publication:06 April 2018
Date first made open access:16 May 2018

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