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- W4385431597 abstract "We revisit stellar energy-loss bounds on the Yukawa couplings $g_{rm B,L}$ of baryophilic and leptophilic scalars $phi$. The white-dwarf luminosity function yields $g_{rm B}lesssim 7 times 10^{-13}$ and $g_{rm L}lesssim 4 times 10^{-16}$, based on bremsstrahlung from ${}^{12}{rm C}$ and ${}^{16}{rm O}$ collisions with electrons. In models with a Higgs portal, this also implies a bound on the scalar-Higgs mixing angle $sin theta lesssim 2 times 10^{-10}$. Our new bounds apply for $m_philesssim {rm 1~keV}$ and are among the most restrictive ones, whereas for $m_philesssim 0.5,{rm eV}$ long-range force measurements dominate. Besides a detailed calculation of the bremsstrahlung rate for degenerate and semi-relativistic electrons, we prove with a simple argument that non-relativistic bremsstrahlung by the heavy partner is suppressed relative to that by the light one by their squared-mass ratio. This large reduction was overlooked in previous much stronger bounds on $g_{rm B}$. In an Appendix, we provide fitting formulas (few percent precision) for the bremsstrahlung emission of baryophilic and leptophilic scalars as well as axions for white-dwarf conditions, i.e., degenerate, semi-relativistic electrons and ion-ion correlations in the ``liquid'' phase." @default.
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- W4385431597 date "2023-07-01" @default.
- W4385431597 modified "2023-10-02" @default.
- W4385431597 title "Stellar limits on scalars from electron-nucleus bremsstrahlung" @default.
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- W4385431597 doi "https://doi.org/10.1088/1475-7516/2023/07/071" @default.
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