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arXiv · 1806.08233

Re-visiting the bounds on hydrogen-antihydrogen oscillations from diffuse $γ$-ray surveys

Yuval Grossman·Wee Hao Ng·Shamayita Ray
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Abstract

Surveys of diffuse $γ$-ray in the interstellar medium (ISM) can be used to probe hydrogen-antihydrogen oscillations, by detecting the $γ$-ray emission from antihydrogen annihilation. A bound on the oscillation parameter $δ$ was originally derived by Feinberg, Goldhaber and Steigman (1978). In this paper, we re-visit the original derivation by performing a more detailed analysis that (1) incorporates suppression effects from additional elastic and inelastic processes, (2) treats the ISM as a multi-phase medium, and (3) utilises more recent $γ$-ray data from the Fermi Large Area Telescope. We find that suppression from elastic scattering plays a more important role than previously thought, while the multi-phase nature of the ISM affects how the $γ$-ray data should be utilised. We derive a more accurate bound on the oscillation period that is about an order of magnitude weaker than the older bound.

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Yuval Grossman, Wee Hao Ng, Shamayita Ray. 2018-06-21. Re-visiting the bounds on hydrogen-antihydrogen oscillations from diffuse $γ$-ray surveys. https://doi.org/10.1103/physrevd.98.035020

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