Searching for dilaton dark matter with atomic clocks

Abstract

We propose an experiment to search for ultralight scalar dark matter (DM) with dilatonic interactions. Such couplings can arise for the dilaton as well as for moduli and axion-like particles in the presence of CP violation. Ultralight dilaton DM acts as a background field that can cause tiny but coherent oscillations in Standard Model parameters such as the fine structure constant and the proton-electron mass ratio. These minute variations can be detected through precise frequency comparisons of atomic clocks. Our experiment extends current searches for drifts in fundamental constants to the well-motivated high-frequency regime. Our proposed setups can probe scalars lighter than 10^-15 eV with discovery potential of dilatonic couplings as weak as 10^-11 times the strength of gravity, improving current equivalence principle bounds by up to 8 orders of magnitude. We point out potential 10^4 sensitivity enhancements with future optical and nuclear clocks, as well as possible signatures in gravitational wave detectors. Finally, we discuss cosmological constraints and astrophysical hints of ultralight scalar DM, and show they are complimentary to and compatible with the parameter range accessible to our proposed laboratory experiments.

17 pages, 10 figures

References in corpus (14)

• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• Test of the Equivalence Principle Using a Rotating Torsion Balance
• Testing General Relativity with Atom Interferometry
• An Atomic Gravitational Wave Interferometric Sensor (AGIS)
• New Limits on Coupling of Fundamental Constants to Gravity Using ${}^{87}$Sr Optical Lattice Clocks
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• Equivalence Principle Violations and Couplings of a Light Dilaton
• Enhanced effect of temporal variation of the fine structure constant in diatomic molecules
• Lunar Laser Ranging Tests of the Equivalence Principle
• An Atomic Gravitational Wave Interferometric Sensor in Low Earth Orbit (AGIS-LEO)
• Performance of a 229 Thorium solid-state nuclear clock
• Monocrystalline AlGaAs heterostructures for high-reflectivity high-Q micromechanical resonators in the MHz regime
• Astronomical and laboratory searches for space-time variation of fundamental constants
• Coulomb energy contribution to the excitation energy in ${}^{229}$Th and enhanced effect of $\alpha$ variation

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• Cosmological Evolution of Fundamental Constants: From Theory to Experiment
• Relativistic tidal effects on clock-comparison experiments
• Visible transitions in Ag-like and Cd-like lanthanide ions
• Atomic properties of actinide ions with particle-hole configurations
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