Cosmological constant in scale-invariant theories

Abstract

The incorporation of a small cosmological constant within radiatively-broken scale-invariant models is discussed. We show that phenomenologically consistent scale-invariant models can be constructed which allow a small positive cosmological constant, providing certain relation between the particle masses is satisfied. As a result, the mass of the dilaton is generated at two-loop level. Another interesting consequence is that the electroweak symmetry-breaking vacuum in such models is necessarily a metastable `false' vacuum which, fortunately, is not expected to decay on cosmological time scales.

10 pages; v2: clarifying remarks added, to appear in Physical Review D

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• Poincare Protection for a Natural Electroweak Scale
• Conformal model for gravitational waves and dark matter: A status update
• Scale-Invariant Quadratic Gravity and Inflation in the Palatini Formalism
• Minimal conformal extensions of the Higgs sector
• Evolving Planck Mass in Classically Scale-Invariant Theories
• Nambu-Goldstone Dark Matter in a Scale Invariant Bright Hidden Sector
• Low temperature electroweak phase transition in the Standard Model with hidden scale invariance
• Scale genesis and gravitational wave in a classically scale invariant extension of the standard model
• Lepton Number Violation within the Conformal Inverse Seesaw
• Comments on the Hierarchy Problem in Effective Theories
• Scale and electroweak first-order phase transitions
• Minima of Classically Scale-Invariant Potentials
• Aspects of a nonminimal conformal extension of the standard model
• Standard Model with hidden scale invariance and light dilaton
• Scale Invariant Top Condensate
• Scale invariance and the electroweak symmetry breaking