Gravitational wave and collider implications of electroweak baryogenesis aided by nonstandard cosmology
Abstract
Here, we consider various models realizing baryogenesis during the electroweak phase transition (EWBG). Our focus is their possible detection in future collider experiments and possible observation of gravitational waves emitted during the phase transition. We also discuss the possibility of a nonstandard cosmological history which can facilitate EWBG. We show how acceptable parameter space can be extended due to such a modification and conclude that next generation precision experiments such as the ILC will be able to confirm or falsify many models realizing EWBG. We also show that, in general, collider searches are a more powerful probe than gravitational wave searches. However, observation of a deviation from the SM without any hints of gravitational waves can point to models with modified cosmological history that generically enable EWBG with weaker phase transition and thus, smaller GW signals.
 Authors:
 Jagiellonian Univ., Krakow (Poland)
 Univ. of Warsaw (Poland). Faculty of Physics; Univ. of Michigan, Ann Arbor, MI (United States). Michigan Center for Theoretical Physics
 Univ. of Michigan, Ann Arbor, MI (United States). Michigan Center for Theoretical Physics; Deutsches ElektronenSynchrotron (DESY), Hamburg (Germany)
 Publication Date:
 Research Org.:
 Univ. of Michigan, Ann Arbor, MI (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC); Ministry of Science and Higher Education (Poland); Deutsches ElektronenSynchrotron (DESY), Hamburg (Germany); Polish National Science Centre (NCN); Alexander von Humboldt Foundation (Germany)
 OSTI Identifier:
 1425673
 Grant/Contract Number:
 SC0007859; 0290/IP3/2016/74; 2014/13/N/ST2/02712; 2015/16/T/ST2/00527; IP2015 043174
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Journal of High Energy Physics (Online)
 Additional Journal Information:
 Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 3; Journal ID: ISSN 10298479
 Publisher:
 Springer Berlin
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Cosmology of Theories beyond the SM; Higgs Physics; Solitons Monopoles and Instantons
Citation Formats
Artymowski, Michal, Lewicki, Marek, and Wells, James D. Gravitational wave and collider implications of electroweak baryogenesis aided by nonstandard cosmology. United States: N. p., 2017.
Web. doi:10.1007/JHEP03(2017)066.
Artymowski, Michal, Lewicki, Marek, & Wells, James D. Gravitational wave and collider implications of electroweak baryogenesis aided by nonstandard cosmology. United States. doi:10.1007/JHEP03(2017)066.
Artymowski, Michal, Lewicki, Marek, and Wells, James D. Mon .
"Gravitational wave and collider implications of electroweak baryogenesis aided by nonstandard cosmology". United States.
doi:10.1007/JHEP03(2017)066. https://www.osti.gov/servlets/purl/1425673.
@article{osti_1425673,
title = {Gravitational wave and collider implications of electroweak baryogenesis aided by nonstandard cosmology},
author = {Artymowski, Michal and Lewicki, Marek and Wells, James D.},
abstractNote = {Here, we consider various models realizing baryogenesis during the electroweak phase transition (EWBG). Our focus is their possible detection in future collider experiments and possible observation of gravitational waves emitted during the phase transition. We also discuss the possibility of a nonstandard cosmological history which can facilitate EWBG. We show how acceptable parameter space can be extended due to such a modification and conclude that next generation precision experiments such as the ILC will be able to confirm or falsify many models realizing EWBG. We also show that, in general, collider searches are a more powerful probe than gravitational wave searches. However, observation of a deviation from the SM without any hints of gravitational waves can point to models with modified cosmological history that generically enable EWBG with weaker phase transition and thus, smaller GW signals.},
doi = {10.1007/JHEP03(2017)066},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2017,
place = {United States},
year = {Mon Mar 13 00:00:00 EDT 2017},
month = {Mon Mar 13 00:00:00 EDT 2017}
}
Web of Science

We analyse a simple extension of the SM with just an additional scalar singlet coupled to the Higgs boson. Here, we discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. We show that a large portion of the model parameter space exists where the observation of gravitational waves would allow detection while the indirect collider searches would not.Cited by 3

Closing in on supersymmetric electroweak baryogenesis with dark matter searches and the Large Hadron Collider
We study the impact of recent direct and indirect searches for particle dark matter on supersymmetric models with resonant neutralino or charginodriven electroweak baryogenesis (EWB) and heavy sfermions. We outline regions of successful EWB on the planes defined by gaugino and higgsino mass parameters, and calculate the portions of those planes excluded by dark matter search results, and the regions soon to be probed by current and future experiments. We conclude that dark matter searches robustly exclude a winolike lightest supersymmetric particle in successful EWB regions. Binolike dark matter is still a possibility, although one that will be probed withmore » 
Gravitational baryogenesis in GaussBonnet braneworld cosmology
The mechanism of gravitational baryogenesis, based on the CPTviolating gravitational interaction between the derivative of the Ricci scalar curvature and the baryonnumber current, is investigated in the context of the GaussBonnet braneworld cosmology. We study the constraints on the fundamental fivedimensional gravity scale, the effective scale of Bviolation and the decoupling temperature, for the above mechanism to generate an acceptable baryon asymmetry during the radiationdominated era. The scenario of gravitational leptogenesis, where the leptonnumber violating interactions are associated with the neutrino mass seesaw operator, is also considered. 
Electroweak baryogenesis and standard model [ital CP] violation
We analyze the mechanism of electroweak baryogenesis proposed by Farrar and Shaposhnikov in which the phase of the CKM mixing matrix is the only source of [ital CP] violation. This mechanism is based on a phase separation of baryons via the scattering of quasiparticles by the wall of an expanding bubble produced at the electroweak phase transition. In agreement with the recent work of Gavela, Hernandez, Orloff, and Pene, we conclude the QCD damping effects reduce the asymmetry produced to a negligible amount. We interpret the damping as quantum decoherence. We compute the asymmetry analytically. Our analysis reflects the observationmore » 
{ital CP} violation for electroweak baryogenesis from mixing of standard model and heavy vector quarks
It is known that the {ital CP} violation in the minimal standard model is insufficient to explain the observed baryon asymmetry of the Universe in the context electroweak baryogenesis. In this paper we consider the possibility that the additional {ital CP} violation required could originate in the mixing of the standard model quarks and heavy vector quark pairs. We consider the baryon asymmetry in the context of the spontaneous baryogenesis scenario. It is shown that, in general, the {ital CP}violating phase entering the mass matrix of the standard model and heavy vector quarks must be space dependent in order tomore »