Spin-2 dark matter from anisotropic Universe in bigravity

Abstract

Bigravity is one of the natural extensions of general relativity and contains an additional massive spin-2 field which can be a good candidate for dark matter. To discuss the production of spin-2 dark matter, we study fixed point solutions of the background equations for axisymmetric Bianchi type-I Universes in two bigravity theories without Boulware-Deser ghost, i.e., Hassan-Rosen bigravity and Minimal Theory of Bigravity. We investigate the local and global stability of the fixed points and classify them. Based on the general analysis, we propose a new scenario where spin-2 dark matter is produced by the transition from an anisotropic fixed point solution to isotropic one. The produced spin-2 dark matter can account for all or a part of dark matter and can be directly detected by laser interferometers in the same way as gravitational waves.

15 pages, 3 figures

References in corpus (10)

• Resummation of Massive Gravity
• Massive gravity: nonlinear instability of the homogeneous and isotropic universe
• Heavy spin-2 Dark Matter
• Anisotropic Friedmann-Robertson-Walker universe from nonlinear massive gravity
• Viable cosmology in bimetric theory
• Oscillating Spin-2 Dark Matter
• Generalized Galileon Duality
• Improved sensitivity of interferometric gravitational wave detectors to ultralight vector dark matter from the finite light-traveling time
• Searching for spin-2 ULDM with gravitational waves interferometers
• Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio

Cited by in corpus (9)

• Instability and backreaction of massive spin-2 fields around black holes
• Cosmological Perturbation Theory in Metric-Affine Gravity
• Bimetric Starobinsky model
• Angular correlation and deformed Hellings-Downs curve from spin-2 ultralight dark matter
• Massive graviton dark matter searches with long-baseline atom interferometers
• On the absence of ghosts in quadratic bigravity
• Probing Spin-2 Ultralight Dark Matter with Space-based Gravitational Wave Detectors in the mHz Regime
• Signature of polarized ultralight vector dark matter in pulsar timing arrays
• Dynamically induced spin-2 mass in a Weyl-invariant framework