Cherenkov radiation from stars constrains hybrid MOND dark matter models

Abstract

We propose a new method to constrain alternative models for dark matter with observations. Specifically, we consider hybrid models in which cold dark matter (CDM) phenomena on cosmological scales and Modified Newtonian Dynamics (MOND) phenomena on galactic scales share a common origin. Various such models were recently proposed. They typically contain a mode that is directly coupled to matter (for MOND) and has a non-relativistic sound speed (for CDM). This allows even non-relativistic objects like stars to lose energy through Cherenkov radiation. This is unusual. Most modified gravity models have a relativistic sound speed, so that only high-energy cosmic rays emit Cherenkov radiation. We discuss the consequences of this Cherenkov radiation from stars.

arXiv comment13 pages, 3 figures, accepted for publication in JCAP

References in corpus (16)

• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• Theory of Dark Matter Superfluidity
• A new relativistic theory for Modified Newtonian Dynamics
• Lower Bound on the Propagation Speed of Gravity from Gravitational Cherenkov Radiation
• Constraining the New Aether: Gravitational Cherenkov Radiation
• Field-theoretical formulations of MOND-like gravity
• Improving relativistic MOND with Galileon k-mouflage
• Phenomenological consequences of superfluid dark matter with baryon-phonon coupling
• Dynamical Friction in Superfluids
• Constraining Relativistic Generalizations of Modified Newtonian Dynamics with Gravitational Waves
• The Imprint of Spiral Arms on the Galactic Rotation Curve
• The Milky Way's rotation curve with superfluid dark matter
• On Effective Theory of Superfluid Phonons
• Gravitational Cherenkov losses in MOND theories
• Three problems of superfluid dark matter and their solution
• A novel Cherenkov radiation constraint for hybrid MOND dark matter models

Cited by in corpus (6)

• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Fast galaxy bars continue to challenge standard cosmology
• Strong constraints on the gravitational law from $Gaia$ DR3 wide binaries
• Dynamical system analysis of cosmological evolution in the Aether scalar tensor theory
• Aether scalar tensor theory: Hamiltonian Formalism
• Stealth black holes in Aether Scalar Tensor theory