Abstract
We consider an effective theory for a shift-symmetric, quadratically-coupled, ultralight spin-0 field. The leading CP conserving interactions with Standard Model fields in the effective theory arise at dimension 8. We discuss the renormalization group evolution and positivity bounds on these operators, as well as their possible UV origins. Assuming that the spin-0 field is associated with an ultralight dark matter candidate, we discuss the effects of the dimension-8 operators on experiments searching for the oscillation of fundamental constants and Lorentz violation. We find that the direct bounds on these two effects are of similar strength but rather weak, corresponding to a UV cutoff scale of keV order, as they are mediated by dimension-8 operators.
| Original language | English |
|---|---|
| Article number | 114 |
| Journal | Journal of High Energy Physics |
| Volume | 2024 |
| DOIs | |
| Publication status | Published - 14 Aug 2024 |
Funding
The authors thank Marco Gorghetto, Wei Xue, Marianna Safronova, and Hyungjin Kim for valuable discussions. The work of MJ is supported by a research grant from the Musk Foundation. The work of GP is supported by grants from BSF-NSF, Friedrich Wilhelm Bessel research award of the Alexander von Humboldt Foundation, GIF, ISF, Minerva, SABRA — Yeda-Sela — WRC Program, the Estate of Emile Mimran, and the Maurice and Vivienne Wohl Endowment. BP is grateful to the Weizmann Institute of Science for its kind hospitality and support through the SRITP and the Benoziyo Endowment Fund for the Advancement of Science. Publisher Copyright: © The Author(s) 2024.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics