Standard model with a complex scalar singlet: Cosmological implications and theoretical considerations
We analyze the theoretical and phenomenological considerations for the electroweak phase transition and dark matter in an extension of the standard model with a complex scalar singlet (cxSM). In contrast with earlier studies, we use a renormalization group improved scalar potential and treat its thermal history in a gauge-invariant manner. We find that the parameter space consistent with a strong first-order electroweak phase transition (SFOEWPT) and present dark matter phenomenological constraints is significantly restricted compared to results of a conventional, gauge-noninvariant analysis. In the simplest variant of the cxSM, recent LUX data and a SFOEWPT require a dark matter mass close to half the mass of the standard model-like Higgs boson. We also comment on various caveats regarding the perturbative treatment of the phase transition dynamics.
Additional Information© 2017 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. Received 26 August 2017; published 8 January 2018. C. C. and E. S. were supported in part by the Ministry of Science and Technology of Taiwan under Grants No. 104-2628-M-008-004-MY4 and No. 105-2811-M-002-126, respectively, and IBS under Grant No. IBS-R018-D1 (E. S.). M. J. R.-M. was supported in part by U.S. Department of Energy Contract No. DE-SC0011095. M. J. R.-M. is also grateful for the hospitality of the Department of Physics at the University of Arizona, where a portion of this work was completed.
Published - PhysRevD.97.015005.pdf
Submitted - 1707.09960.pdf