scholarly journals Electroweak phase transition with three phases in the SU(2)1 ⊗ SU(2)2 ⊗ U(1)Y model

2019 ◽  
Vol 34 (15) ◽  
pp. 1950073
Author(s):  
Vo Quoc Phong ◽  
Minh Anh Nguyen
Keyword(s):  
Phase Transition ◽  
Coupling Constant ◽  
Gauge Bosons ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
200 Gev ◽  
Strength Formula ◽  
The Masses ◽  
First Order Phase

Our analysis shows that SM-like electroweak phase transition (EWPT) in the [Formula: see text] (2-2-1) model is a first-order phase transition at the 200 GeV scale (the SM scale). Its strength [Formula: see text] is about 1–2.7 and the masses of new gauge bosons are larger than 1.7 TeV when the second VEV is larger than 535 GeV in a three-stage EWPT scenario and the coupling constant of [Formula: see text] group must be larger than 2. Therefore, this first-order EWPT can be used to fix VEVs and the coupling constant of the gauge group in electroweak models.

scholarly journals Two Electro-weak Phases in the \(SU(2)_1 \otimes SU(2)_2 \otimes U(1)_Y\) Model

2019 ◽  
Vol 29 (2) ◽  
pp. 149
Author(s):  
Vo Quoc Phong ◽  
Nguyen Minh Anh
Keyword(s):  
Phase Transition ◽  
Correlation Length ◽  
Order Phase Transition ◽  
Length Function ◽  
Two Stage ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
200 Gev ◽  
First Order Phase

Our analysis shows that SM-like electroweak phase transition (EWPT) in the \(SU(2)_1 \otimes SU(2)_2 \otimes U(1)_Y\) (2-2-1) model is a first-order phase transition at the $200$ GeV scale, enough for baryogenesis. This first order EWPT is described by a non-smooth correlation length function. The second VEV is larger than 1.1 TeV in a two-stage EWPT senarino.

scholarly journals Dark Matter production from relativistic bubble walls

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Aleksandr Azatov ◽  
Miguel Vanvlasselaer ◽  
Wen Yin
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Electroweak Phase Transition ◽  
First Order ◽  
Matter Production ◽  
First Order Phase Transition ◽  
Relic Abundance ◽  
Higgs Portal ◽  
First Order Phase ◽  
Gravitational Background

Abstract In this paper we present a novel mechanism for producing the observed Dark Matter (DM) relic abundance during the First Order Phase Transition (FOPT) in the early universe. We show that the bubble expansion with ultra-relativistic velocities can lead to the abundance of DM particles with masses much larger than the scale of the transition. We study this non-thermal production mechanism in the context of a generic phase transition and the electroweak phase transition. The application of the mechanism to the Higgs portal DM as well as the signal in the Stochastic Gravitational Background are discussed.

scholarly journals Upper limit on first-order electroweak phase transition strength

2021 ◽  
Vol 36 (05) ◽  
pp. 2150024
Author(s):  
Shehu AbdusSalam ◽  
Mohammad Javad Kazemi ◽  
Layla Kalhor
Keyword(s):  
Phase Transition ◽  
Particle Physics ◽  
Baryon Number ◽  
Transition Strength ◽  
Bubble Wall ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
The Standard Model ◽  
First Order Phase

For a cosmological first-order electroweak phase transition, requiring no sphaleron washout of baryon number violating processes leads to a lower bound on the strength of the transition. The velocity of the boundary between the phases, the so-called bubble wall, can become ultrarelativistic if the friction due to the plasma of particles is not sufficient to retard the wall’s acceleration. This bubble “runaway” should not occur if a successful baryon asymmetry generation due to the transition is required. Using Boedeker–Moore criterion for bubble wall runaway, within the context of an extension of the Standard Model of particle physics with a real gauge-single scalar field, we show that a nonrunaway transition requirement puts an upper bound on the strength of the first-order phase transition.

scholarly journals THE TYPE OF THE PHASE TRANSITION AND COUPLING VALUES IN λϕ4 MODEL

2012 ◽  
Vol 27 (21) ◽  
pp. 1250116 ◽  
Author(s):  
M. BORDAG ◽  
V. DEMCHIK ◽  
A. GULOV ◽  
V. SKALOZUB
Keyword(s):  
Phase Transition ◽  
Monte Carlo Simulation ◽  
Coupling Constant ◽  
Huge Amount ◽  
Simulation Data ◽  
First Order ◽  
First Order Phase Transition ◽  
Cluster A ◽  
The One ◽  
First Order Phase

The temperature induced phase transition is investigated in the one-component scalar field ϕ4 model on the lattice. Using the GPU cluster a huge amount of Monte Carlo simulation data is collected for a wide interval of coupling values. This gives a possibility to determine the low bound on the coupling constant λ0 when the transition happens and investigate its type. We found that for the values of λ close to this bound a weak-first-order phase transition takes place. It converts into a second-order one with the increase of λ. A comparison with the results obtained in analytic and numeric calculations by other authors is given.

scholarly journals Gravitational waves from the first order electroweak phase transition in the Z3 symmetric singlet scalar model

2018 ◽  
Vol 168 ◽  
pp. 05001 ◽  
Author(s):  
Toshinori Matsui
Keyword(s):  
Phase Transition ◽  
Gravitational Waves ◽  
Higgs Sector ◽  
Electroweak Symmetry ◽  
Scalar Model ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase ◽  
The Universe

Among various scenarios of baryon asymmetry of the Universe, electroweak baryogenesis is directly connected with physics of the Higgs sector. We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogenesis. In the Z3 symmetric singlet scalar model, the significant gravitational waves are caused by the multi-step phase transition. We show that the model can be tested by measuring the characteristic spectra of the gravitational waves at future interferometers such as LISA and DECIGO.

scholarly journals Strong Electroweak Phase Transition in a Model with Extended Scalar Sector

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Mina Saeedhosseini ◽  
Ali Tofighi
Keyword(s):  
Phase Transition ◽  
Order Phase Transition ◽  
Peak Frequency ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
Wall Collision ◽  
First Order Phase ◽  
Gravitational Wave Background ◽  
Scalar Sector

We consider an extension of the Standard Model (SM) with additional gauge singlets which exhibits a strong first-order phase transition. Due to this first-order phase transition in the early universe gravitational waves are produced. We estimate the contributions such as the sound wave, the bubble wall collision, and the plasma turbulence to the stochastic gravitational wave background, and we find that the strength at the peak frequency is large enough to be detected at future gravitational interferometers such as eLISA. Deviations in the various Higgs boson self-couplings are also evaluated.

scholarly journals Electroweak phase transition triggered by fermion sector

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Qing-Hong Cao ◽  
Katsuya Hashino ◽  
Xu-Xiang Li ◽  
Zhe Ren ◽  
Jiang-Hao Yu
Keyword(s):  
Phase Transition ◽  
Quadratic Term ◽  
Mass Hierarchy ◽  
Higgs Potential ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
Higher Dimensional ◽  
Quartic Term ◽  
First Order Phase

Abstract To realize first-order electroweak phase transition, it is necessary to generate a barrier in the thermal Higgs potential, which is usually triggered by scalar degree of freedom. We instead investigate phase transition patterns in pure fermion extensions of the standard model, and find that additional fermions with mass hierarchy and mixing could develop such a barrier and realize a strongly first-order phase transition in such models. In the Higgs potential with polynomial parametrization, the barrier can be generated in the following two patterns by fermionic reduction effects: (I) positive quadratic term, negative cubic term and positive quartic term or (II) positive quadratic term, negative quartic term and positive higher dimensional term, such as dimensional 6 operator.

scholarly journals ELECTROWEAK BARYOGENESIS AND THE PHASE TRANSITION DYNAMICS

1994 ◽  
Vol 09 (28) ◽  
pp. 2599-2610 ◽  
Author(s):  
AZUSA YAMAGUCHI ◽  
AKIO SUGAMOTO
Keyword(s):  
Phase Transition ◽  
Temporal Change ◽  
Baryon Number ◽  
Lepton Number ◽  
Time Development ◽  
Electroweak Phase Transition ◽  
Transition Dynamics ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

The baryogenesis is reanalyzed based on the model by Cohen et al., in which the lepton number, generated by the neutrinos scattering from the bubble walls appearing in the development of the electroweak phase transition, is converted to the baryon number excess through the sphaleron transition. A formula obtained in this paper on the lepton number production rate is correct for both the thin and thick walls within the linear approximation. Investigation on the time development of the first order phase transition is simulated, including the temporal change of the wall velocity as well as the fusion effect of the bubbles. The details of such phase transition dynamics are found to affect considerably the final value of the baryon number excess.

scholarly journals EFFECT OF STRONG MAGNETIC FIELD ON THE FIRST-ORDER ELECTROWEAK PHASE TRANSITION

1999 ◽  
Vol 14 (06) ◽  
pp. 407-415 ◽  
Author(s):  
R. FIORE ◽  
A. TIESI ◽  
L. MASPERI ◽  
A. MÉGEVAND
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Higgs Mass ◽  
Critical Value ◽  
Broken Symmetry ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase ◽  
The Magnetic Field

The broken-symmetry electroweak vacuum is destabilized in the presence of a magnetic field stronger than a critical value. Such magnetic field may be generated in the phase transition and restore the symmetry inside the bubbles. A numerical calculation indicates that the first-order phase transition is delayed but may be completed for a sufficient low value of the Higgs mass unless the magnetic field is extremely high.

scholarly journals DEVELOPMENT OF THE ELECTROWEAK PHASE TRANSITION AND BARYOGENESIS

2000 ◽  
Vol 09 (06) ◽  
pp. 733-755 ◽  
Author(s):  
ARIEL MÉGEVAND
Keyword(s):  
Phase Transition ◽  
Order Phase Transition ◽  
Effective Potential ◽  
Significant Variation ◽  
Higgs Field ◽  
Small Interval ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

We investigate the evolution of the electroweak phase transition, using a one-Higgs effective potential that can be regarded as an approximation for the Minimal Supersymmetric Standard Model. The phase transition occurs in a small interval around a temperature Tt below the critical one. We calculate this temperature as a function of the parameters of the potential and of a damping coefficient related to the viscosity of the plasma. The parameters that are relevant for baryogenesis, such as the velocity and thickness of the walls of bubbles and the value of the Higgs field inside them, change significantly in the range of temperatures where the first-order phase transition can occur. However, we find that in the likely interval for Tt there is no significant variation of these parameters. Furthermore, the temperature Tt is in general not far below the temperature at which bubbles begin to nucleate.

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