Fine tuning, sequestering, and the swampland

DOI10.1016/J.PHYSLETB.2019.135004zbMATH Open1434.81148arXiv1905.06342OpenAlexW2979919068WikidataQ127155886 ScholiaQ127155886MaRDI QIDQ2187228

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Publication date: 2 June 2020

Published in: (Search for Journal in Brave)

Abstract: We conjecture and present evidence that any effective field theory coupled to gravity in flat space admits at most a finite number of fine tunings, depending on the amount of supersymmetry and spacetime dimension. In particular, this means that there are infinitely many non-trivial correlations between the allowed deformations of a given effective field theory in the gravitational context. Fine tuning of parameters allows us to obtain some consistent CFTs in the IR limit of gravitational theories. Related to finiteness of fine tunings, we conjecture that except for a finite number of CFTs, the rest cannot be consistently coupled to gravity and belong to the swampland. Moreover, we argue that even though matter sectors coupled to gravity may sometimes be partially sequestered, there is an irreducible level of mixing between them, correlating and coupling infinitely many operators between these sectors.

Full work available at URL: https://arxiv.org/abs/1905.06342

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