The vacuum structure in QCD and hadron-hadron scattering

1984 ◽  
Vol 24 (3-4) ◽  
pp. 283-296 ◽  
Author(s):  
O. Nachtmann ◽  
A. Reiter
Keyword(s):  
Vacuum Structure

scholarly journals Nucleation is more than critical: A case study of the electroweak phase transition in the NMSSM

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Sebastian Baum ◽  
Marcela Carena ◽  
Nausheen R. Shah ◽  
Carlos E. M. Wagner ◽  
Yikun Wang
Keyword(s):  
Phase Transition ◽  
Parameter Space ◽  
Local Minima ◽  
Critical Temperatures ◽  
Electroweak Phase Transition ◽  
First Order ◽  
Vacuum Structure ◽  
The Universe ◽  
Scalar Sector

Abstract Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of the Universe via a strong first order electroweak phase transition. We compare the phase transition patterns suggested by the vacuum structure at the critical temperatures, at which local minima are degenerate, with those obtained from computing the probability for nucleation via tunneling through the barrier separating local minima. Heuristically, nucleation becomes difficult if the barrier between the local minima is too high, or if the distance (in field space) between the minima is too large. As an example of a model exhibiting such behavior, we study the Next-to-Minimal Supersymmetric Standard Model, whose scalar sector contains two SU(2) doublets and one gauge singlet. We find that the calculation of the nucleation probabilities prefers different regions of parameter space for a strong first order electroweak phase transition than the calculation based solely on the critical temperatures. Our results demonstrate that analyzing only the vacuum structure via the critical temperatures can provide a misleading picture of the phase transition patterns, and, in turn, of the parameter space suitable for electroweak baryogenesis.

Planar rotor: Theθ-vacuum structure, and some approximate methods in quantum mechanics

1983 ◽  
Vol 27 (8) ◽  
pp. 1852-1868 ◽  
Author(s):  
M. Asorey ◽  
J. G. Esteve ◽  
A. F. Pacheco
Keyword(s):  
Quantum Mechanics ◽  
Approximate Methods ◽  
Vacuum Structure

On the vacuum structure of an SU(2) Yang-Mills theory

1979 ◽  
Vol 16 (2) ◽  
pp. 281-291 ◽  
Author(s):  
D.H. Mayer ◽  
K.S. Viswanathan
Keyword(s):  
Yang Mills ◽  
Vacuum Structure

scholarly journals Vacuum structure in 5D SO(10) GUT on S1/Z2

2004 ◽  
Vol 597 (2) ◽  
pp. 166-172 ◽  
Author(s):  
Naoyuki Haba ◽  
Toshifumi Yamashita
Keyword(s):  
Vacuum Structure

scholarly journals BRST cohomology and vacuum structure of two-dimensional chromodynamics

1995 ◽  
Vol 363 (1-2) ◽  
pp. 85-92 ◽  
Author(s):  
E Abdalla ◽  
K.D Rothe
Keyword(s):  
Two Dimensional ◽  
Vacuum Structure ◽  
Brst Cohomology

scholarly journals Vacuum structure of two-dimensional gauge theories for arbitrary Lie groups

1997 ◽  
Vol 506 (1-2) ◽  
pp. 521-536 ◽  
Author(s):  
L.D. Paniak ◽  
G.W. Semenoff ◽  
A.R. Zhitnitsky
Keyword(s):  
Lie Groups ◽  
Gauge Theories ◽  
Two Dimensional ◽  
Vacuum Structure

Probing for Dirac vacuum structure in nuclei

1986 ◽  
Vol 182 (3-4) ◽  
pp. 221-225 ◽  
Author(s):  
N. Auerbach ◽  
Alfred S. Goldhaber ◽  
Mikkel B. Johnson ◽  
L.Dudley Miller ◽  
A. Picklesimer
Keyword(s):  
Vacuum Structure

scholarly journals Novel thick brane solutions with U(1) symmetry breaking

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Marzieh Peyravi ◽  
Nematollah Riazi ◽  
Francisco S. N. Lobo
Keyword(s):  
Symmetry Breaking ◽  
Scalar Fields ◽  
Einstein Tensor ◽  
Vacuum Structure ◽  
Different Types ◽  
Dimensional Gravity ◽  
Breaking Parameter ◽  
Symmetry Breaking Term ◽  
The Stability ◽  
Breaking Term

AbstractIn this work, using two scalar fields ($$\phi $$ ϕ , $$\psi $$ ψ ) coupled to 4 + 1 dimensional gravity, we construct novel topological brane solutions through an explicit U(1) symmetry breaking term. The potential of this model is constructed so that two distinct degenerate vacua in the $$\phi $$ ϕ field exist, in analogy to the $$\phi ^{4}$$ ϕ 4 potential. Therefore, brane solutions appear due to the vacuum structure of the $$\phi $$ ϕ field. However, the topology and vacuum structure in the $$\psi $$ ψ direction depends on the symmetry breaking parameter $$\beta ^{2}$$ β 2 , which leads to different types of branes. As a result, one can interpret the present model as a combination of a $$\phi ^{4}$$ ϕ 4 brane with an auxiliary field, which leads to deviations from the $$\phi ^{4}$$ ϕ 4 system with the brane achieving a richer internal structure. Furthermore, we analyse in detail the behaviour of the superpotentials, the warp factors, the Ricci and Kretschmann scalars and the Einstein tensor components. In addition to this, we explore the stability of the brane in terms of the free parameters of the model. The analysis presented here complements previous work and is sufficiently novel to be interesting.

Sign in / Sign up

Export Citation Format

Share Document