Introduces a directional force template for quadratic ultralight DM couplings, recasts MICROSCOPE constraints, and estimates sensitivity improvement in the anisotropic regime.
Environmental Dependence of Masses and Coupling Constants
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abstract
We construct a class of scalar field models coupled to matter that lead to the dependence of masses and coupling constants on the ambient matter density. Such models predict a deviation of couplings measured on the Earth from values determined in low-density astrophysical environments, but do not necessarily require the evolution of coupling constants with the redshift in the recent cosmological past. Additional laboratory and astrophysical tests of \Delta \alpha and \Delta(m_p/m_e) as functions of the ambient matter density are warranted.
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Collective nucleon scattering in neutron-star matter suppresses the effective absorption of ultralight bosons at the long wavelengths relevant for superradiance, weakening the link between stellar cooling bounds and superradiant instability rates.
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A directional force template for quadratically coupled ultralight dark matter
Introduces a directional force template for quadratic ultralight DM couplings, recasts MICROSCOPE constraints, and estimates sensitivity improvement in the anisotropic regime.
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Stellar Superradiance and Low-Energy Absorption in Dense Nuclear Media
Collective nucleon scattering in neutron-star matter suppresses the effective absorption of ultralight bosons at the long wavelengths relevant for superradiance, weakening the link between stellar cooling bounds and superradiant instability rates.