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Do We Live in the Swampland?
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A low-energy effective theory is said to be in the swampland if it does not have any consistent UV completion inside a theory of quantum gravity. The natural question is if the standard model of particle physics, possibly with some minimal extensions, are in the swampland or not. We discuss this question in view of the recent swampland conjectures. We prove a no-go theorem concerning the modification of the Higgs sector. Moreover, we find that QCD axion is incompatible with the recent swampland conjectures, unless some sophisticated possibilities are considered. We discuss the implications of this result for spontaneous breaking of CP symmetry. We comment on dynamical supersymmetry breaking as well as the issue of multi-valuedness of the potential.
Forward citations
Cited by 3 Pith papers
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Fundamental Forces and Scalar Field Dynamics in the Early Universe
The paper shows that generalized scalar weak gravity conjectures imply the parameter conditions for early-universe scalar condensates to fragment into solitonic lumps, which could form dark matter or primordial black holes.
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Stochastic Survival near Swampland Boundaries
Surviving inflationary histories develop a universal inward drift near any hard swampland boundary — two times the diffusion over the distance to the edge — regardless of the cutoff's microscopic origin.
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Eternal Inflation in Swampy Landscapes
Eternal inflation persists in landscapes where de Sitter vacua are rare or absent, via flyover transitions between isolated dS vacua or inflating bubble walls nucleated around saddle points.
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