Dynamics of Nambu monopole in two Higgs doublet models. Cosmological Monopole Collider

We study the domain wall solutions in the general two-Higgs-doublet model (2HDM) with a CP-violating phase. The 2HDM with the spontaneouse CP violation is found to have domain wall solutions whose tensions are $$ \mathcal{O} $$ O (106) GeV3, which are excluded by the Zel’dovich-Kobzarev-Okun bound. With the explicit CP-violating (CPV) terms as the so-called biased term in the scalar potential, domain walls can collapse in the early Universe. The sizes of the explicit CP violation can be constrained from the Big Bang nucleosynthesis. This constraint is converted to the CPV mixing of αc, and is mostly sensitive to the mass splittings between two heavy neutral Higgs bosons. We estimate the possible gravitational wave signals and the electric dipole moment (EDM) predictions due to the domain wall collapsing. It turns out that the peak spectrum of the GW from the domain wall collapsing cannot be probed in any future program. In contrast, the untenable regions with very tiny explicit CPV parameter in the Higgs potential has been partially excluded by the latest electron EDM measurements at the ACME-II and will be further confirmed or excluded by the future ACME-III projection.

Section: Conclusion and Discussionmentioning

confidence: 99%

Collapsing domain walls in the two-Higgs-doublet model and deep insights from the EDM

Chen

Teng

et al. 2020

“…Since the discovery of the gravitational waves (GW) by the LIGO/Virgo collaboration [5,6], it is widely believed that the further probes of various GW signals in different frequencies can provide an unprecedented window to the new physics beyond the SM. It is likely that the symmetry breaking patterns in new physics models are associated with non-trivial vacuum structure, which therefore leads to various topological defects [7][8][9][10][11][12][13]. The GWs from different topological defects during the early evolution of the Universe have been studied in many early literatures as well as recent ones, such as domain walls [14][15][16][17][18][19][20][21][22][23] and cosmic strings [3,14,15,[24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The gravitational waves from the collapsing domain walls in the complex singlet model

Chen

2020

We study the CP domain walls and the consequent gravitational waves induced by the spontaneous breaking of the CP symmetry in the complex singlet extension to the Standard Model. We impose the constraints from the unitarity, stability and the global minimal of the vacuum solutions on the model parameter space. The CP domain wall profiles and tensions are obtained by numerically solving the relevant field equations. The explicit CP violation terms are then introduced to the potential as biased terms to make the domain walls unstable and collapse, The BBN bound on the magnitude of the energy bias is taken into account. To achieve sufficiently strong gravitational wave signals, the domain wall tension σ is required to be at least σ/TeV 3 ∼ O(10 3). We find that the gravitational wave spectrum can be probed in the future SKA and/or DECIGO programs, when the typical mass scale is at least ∼ O(10) TeV and the explicit CP violation terms are as small as O(10 −24)−O(10 −23). The gravitational waves from collapsing domain walls thus provide a complementarity to the probe of extremely small CP violation at high-energy scale.

“…In refs. [62,64], it is shown that, in 2HDM, the smaller (larger) value of α 3 tends to make the tension of the string with the W -flux heavier (lighter) than that of the string with the Z-flux. Thus, in our case, we expect that the type-C string is lighter than the type-A and type-B ones when α 3 is larger than a critical value depending on other parameters.…”

Section: Jhep06(2021)172mentioning

confidence: 99%

“…The electroweak string is a string containing flux tubes of the SU(2) W × U(1) Y gauge fields like the Abrikosov-Nielsen-Olesen vortex [41,42] and has been studied in the SM [43][44][45][46][47][48][49][50][51] (see ref. [52] for review), and in two Higgs doublet models (2HDM) [53][54][55][56][57][58][59][60][61][62] (for recent comprehensive studies, see refs. [63,64]).…”

Section: Introductionmentioning

confidence: 99%

Electroweak axion string and superconductivity

Abe

Hamada

Yoshioka

2021

Self Cite

We study the axion strings with the electroweak gauge flux in the DFSZ axion model and show that these strings, called the electroweak axion strings, can exhibit superconductivity without fermionic zeromodes. We construct three types of electroweak axion string solutions. Among them, the string with W-flux can be lightest in some parameter space, which leads to a stable superconducting cosmic string. We also show that a large electric current can flow along the string due to the Peccei-Quinn scale much higher than the electroweak scale. This large current induces a net attractive force between the axion strings with the same topological charge, which opens a novel possibility that the axion strings form Y-junctions in the early universe.