The Big Constant Out, The Small Constant In

Abstract

Some time ago, Tseytlin has made an original and unusual proposal for an action that eliminates an arbitrary cosmological constant. The form of the proposed action, however, is strongly modified by gravity loop effects, ruining its benefit. Here I discuss an embedding of Tseytlin's action into a broader context, that enables to control the loop effects. The broader context is another universe, with its own metric and dynamics, but only globally connected to ours. One possible Lagrangian for the other universe is that of unbroken AdS supergravity. A vacuum energy in our universe does not produce any curvature for us, but instead increases or decreases the AdS curvature in the other universe. I comment on how to introduce the accelerated expansion in this framework in a technically natural way, and consider the case where this is done by the self-accelerated solutions of massive gravity and its extensions.

14 pages; a brief paragraph unfolded; 3 refs added; minor improvements

References in corpus (8)

• Resummation of Massive Gravity
• Cosmic Acceleration and the Helicity-0 Graviton
• Exact Schwarzschild-de Sitter black holes in a family of massive gravity models
• Non-Local Modification of Gravity and the Cosmological Constant Problem
• Quasi-Dilaton: Theory and Cosmology
• Non-Renormalization and Naturalness in a Class of Scalar-Tensor Theories
• Anisotropic Friedmann-Robertson-Walker universe from nonlinear massive gravity
• Vacuum Energy Sequestering: The Framework and Its Cosmological Consequences

Cited by in corpus (8)

• Beyond the Cosmological Standard Model
• On couplings to matter in massive (bi-)gravity
• Lectures on the Cosmological Constant Problem
• Relaxing the Cosmological Constant: a Proof of Concept
• An Etude on Global Vacuum Energy Sequester
• Cosmology of Massive Gravity and its Extensions
• Could the dynamics of the Universe be influenced by what is going on inside black holes?
• Nonlocal Galileons and Self-Acceleration