A landscape for the cosmological constant and the Higgs mass

Abstract

The cosmological constant and the Higgs mass seem unnaturally small and anthropically selected. We show that both can be efficiently scanned in Quantum Field Theories with a large enough number of vacua controllable thanks to approximated ${\mathbb{Z}}_2$ symmetries (even for Coleman-Weinberg potentials). We find that vacuum decay in a landscape implies weaker bounds than previously estimated. Special vacua where one light scalar is accidentally light avoid catastrophic vacuum decay if its self-cubic is absent. This is what happens for the Higgs doublet, thanks to gauge invariance. Yukawa couplings can be efficiently scanned, as suggested by anthropic boundaries on light quark masses. Finally, we suggest that the lack of predictivity of landscapes can be mitigated if their probability distributions are non-Gaussian (possibly even fractal).

22 pages, 5 figures

References in corpus (5)

• Computational complexity of the landscape I
• Cosmology From Random Multifield Potentials
• Evidence for the Multiverse in the Standard Model and Beyond
• (Higgs) vacuum decay during inflation
• The Weak Scale from BBN

Cited by in corpus (6)

• Sliding Naturalness: Cosmological Selection of the Weak Scale
• Vacuum Stability vs. Positivity in Real Singlet Scalar Extension of the Standard Model
• Small cosmological constant from a peculiar inflaton potential
• Hierarchies from Landscape Probability Gradients and Critical Boundaries
• Is nature natural?
• The collider landscape: which collider for establishing the SM instability?