Dynamical solution to the axion domain wall problem

Ibe, Masahiro; Kobayashi, Shin; Suzuki, Motoo; Yanagida, Tsutomu T.

doi:10.1103/physrevd.101.035029

Cited by 7 publications

(4 citation statements)

References 68 publications

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“…This phenomenon, known as "clash-of-symmetries" [21][22][23], occurs when the unbroken symmetry subgroups H and H ′ on the two regions outside the wall are embedded differently in the broken symmetry group G. The symmetry group inside the wall will be the intersection H ∩ H ′ which can be smaller than the group H. Such mechanism was used in [21] in order to provide for a way to break symmetries using domain walls in the scenario where our 3+1-dimensional universe exists as a domain wall brane in a 4+1-dimensional spacetime with an action invariant under E 6 symmetry. The spontaneous breaking of E 6 symmetry to differently embedded unbroken SO(10) × U(1) subgroups H and H ′ outside the brane leads the unbroken symmetry group inside the domain wall H ∩ H ′ to be a smaller group containing SU (5). In our model we will show that, due to this mechanism, the symmetry group of electromagnetism can be broken inside the domain wall.…”

Section: Jhep04(2024)101mentioning

confidence: 73%

“…Extensions of the SM scalar sector may lead to the existence of topological defects such as cosmic strings and domain walls. Such defects appear for example in axion models [4][5][6][7][8], supersymmetric models in the context of the spontaneous breaking of the R symmetry [9] and the Z 3 discrete symmetry in the NMSSM [10,11], discrete flavor symmetries [12,13] as well as in the Two-Higgs-Doublet model (2HDM) [14][15][16][17]. In this work we investigate the domain walls solutions in the 2HDM, where the SM scalar sector is extended with a second Higgs doublet of SU(2) L and charged under U Y (1).…”

Section: Introductionmentioning

confidence: 99%

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Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions

Sassi,

Moortgat-Pick

2024

J. High Energ. Phys.

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Discrete symmetries play an important role in several extensions of the Standard Model (SM) of particle physics. For instance, in order to avoid flavor changing neutral currents, a discrete Z2 symmetry is imposed on the Two-Higgs-Doublet Model (2HDM). This can lead to the formation of domain walls (DW) as the Z2 symmetry gets spontaneously broken during electroweak symmetry breaking in the early universe and domain walls form between regions whose vacua are related by the discrete symmetry. Due to this simultaneous spontaneous breaking of both the discrete symmetry and the electroweak symmetry, the vacuum manifold consists of two disconnected 3-spheres. Such a non-trivial disconnected vacuum manifold leads to several choices for the vacua at two adjacent regions, in contrast to models where only the discrete symmetry gets spontaneously broken and the vacuum manifold consists of several disconnected points. Due to this, we end up with several classes of DW solutions having different properties localized inside the wall, such as electric charge and/or CP violating vacua. We discuss the properties of these different classes of DW solutions as well as the interaction of SM fermions with such topological defects leading to different exotic phenomena such as, for example, the top quark being transmitted or reflected off the wall as a bottom quark.

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Section: Jhep04(2024)101mentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions

Sassi,

Moortgat-Pick

2024

J. High Energ. Phys.

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“…Here, H denotes the Hubble expansion rate. This behavior of the scalar field is called the scaling solution [62][63][64]. We focus on this scaling solution with n ¼ 4 as an example in the rest of this section.…”

Section: Sub-kev Fermion Dm From Decay Of a Scalar Field Coherent mentioning

confidence: 99%

Degenerate fermion dark matter from a broken U(1)B−L gauge symmetry

2020

Self Cite

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The extension of the Standard Model by assuming Uð1Þ B-L gauge symmetry is very well motivated since it naturally explains the presence of heavy right-handed neutrinos required to account for the small active neutrino masses via the seesaw mechanism and thermal leptogenesis. Traditionally, we introduce three right-handed neutrinos to cancel the ½Uð1Þ B-L 3 anomaly. However, it suffices to introduce two heavy righthanded neutrinos for these purposes and therefore we can replace one right-handed neutrino by new chiral fermions to cancel the Uð1Þ B-L gauge anomaly. Then, one of the chiral fermions can naturally play a role of a dark matter candidate. In this paper, we demonstrate how this framework produces a dark matter candidate which can address the so-called "core-cusp problem". As one of the small-scale problems that the Λ cold dark matter paradigm encounters, it may imply an important clue for the nature of dark matter. One of resolutions among many is hypothesizing that sub-keV fermion dark matter halos in dwarf spheroidal galaxies are in a (quasi) degenerate configuration. We show how the degenerate sub-keV fermion dark matter candidate can be nonthermally originated in our model and thus can be consistent with the Lyman-α forest observation. Thereby, the small neutrino mass, baryon asymmetry, and the sub-keV dark matter become consequences of the broken B-L gauge symmetry.

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“…Nevertheless, ALP DW could exist up to the modern epoch in the post-inflation scenario since ALP fields are not restricted by the QCD phenomology [31][32][33][34]. If they indeed exist, such ALP DW dark matter would have a highly nonuniform local density.…”

Section: Introductionmentioning

confidence: 99%

A machine learning algorithm for direct detection of axion-like particle domain walls

Kim¹,

Kimball²,

Masia‐Roig³

et al. 2021

Preprint

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The Global Network of Optical Magnetometers for Exotic physics searches (GNOME) conducts an experimental search for certain forms of dark matter based on their spatiotemporal signatures imprinted on a global array of synchronized atomic magnetometers. The experiment described here looks for a gradient coupling of axion-like particles (ALPs) with proton spins as a signature of locally dense dark matter objects such as domain walls. In this work, stochastic optimization with machine learning is proposed for use in a search for ALP domain walls based on GNOME data.The validity and reliability of this method were verified using binary classification. The projected sensitivity of this new analysis method for ALP domain-wall crossing events is presented.

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Dynamical solution to the axion domain wall problem

Cited by 7 publications

References 68 publications

Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions

Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions

Degenerate fermion dark matter from a broken U(1)B−L gauge symmetry

A machine learning algorithm for direct detection of axion-like particle domain walls

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