Effective Couplings of Grand Unified Theories in Curved Space-Time

1984 ◽  
Vol 52 (15) ◽  
pp. 1269-1271 ◽  
Author(s):  
Leonard Parker ◽  
David J. Toms
Keyword(s):  
Space Time ◽  
Curved Space ◽  
Grand Unified Theories ◽  
Unified Theories

scholarly journals FINITE GRAND UNIFIED THEORIES AND INFLATION

1998 ◽  
Vol 13 (16) ◽  
pp. 2739-2745 ◽  
Author(s):  
S. MUKAIGAWA ◽  
T. MUTA ◽  
S. D. ODINTSOV
Keyword(s):  
Space Time ◽  
Gravitational Coupling ◽  
Coupling Constant ◽  
Curved Space ◽  
Grand Unified Theories ◽  
Gravitational Coupling Constant ◽  
Unified Theories ◽  
Cosmological Inflation ◽  
Inflation Scenario ◽  
Chaotic Inflation

A class of finite GUT's in curved space–time is considered in connection with the cosmological inflation scenario. It is confirmed that the use of the running scalar-gravitational coupling constant in these models helps realizing a successful chaotic inflation. The analyses are made for some different sets of the models.

THE ENERGY OF 5D SOLITONS

2001 ◽  
Vol 16 (10) ◽  
pp. 627-632 ◽  
Author(s):  
W. N. SAJKO ◽  
P. S. WESSON
Keyword(s):  
Event Horizon ◽  
Equivalence Principle ◽  
Space Time ◽  
Electromagnetic Energy ◽  
Time Structure ◽  
Hamiltonian Approach ◽  
Grand Unified Theories ◽  
Space Time Structure ◽  
Unified Theories ◽  
The Status

We clarify the status of 5D solitons by calculating their energies using a Hamiltonian approach. These objects in general possess gravitational, scalar and electromagnetic energy which complicates their space–time structure. However, the Schwarzschild case is unique in having an event horizon that gives back the usual 4D entropy. We outline applications to grand-unified theories and tests of the equivalence principle.

scholarly journals CLASSIFICATION OF STANDARD MODEL PARTICLES IN E6 ORBIFOLD GRAND UNIFIED THEORIES

2013 ◽  
Vol 28 (14) ◽  
pp. 1350055 ◽  
Author(s):  
YOSHIHARU KAWAMURA ◽  
TAKASHI MIURA
Keyword(s):  
Standard Model ◽  
Dimensional Space ◽  
Space Time ◽  
Text Representation ◽  
Zero Modes ◽  
Grand Unified Theories ◽  
The Standard Model ◽  
Unified Theories ◽  
Dimensional Space Time

We classify the standard model fermions, which originate from bulk fields of the 27 or [Formula: see text] representation after orbifold breaking, in E6 grand unified theories on five- or six-dimensional space–time, under the condition that q, ec and uc survive as zero modes for each 27 or [Formula: see text]. We study features of supersymmetric SU(5) ×U(1)1 ×U(1)2 model.

Water, Water, Here and There

2018 ◽  
Author(s):  
Steven E. Vigdor
Keyword(s):  
Quark Mass ◽  
Mass Difference ◽  
Baryon Number ◽  
Electroweak Phase Transition ◽  
Hydrogen Burning ◽  
Quark Masses ◽  
Grand Unified Theories ◽  
Down Quark ◽  
Unified Theories ◽  
The Stability

Chapter 4 deals with the stability of the proton, hence of hydrogen, and how to reconcile that stability with the baryon number nonconservation (or baryon conservation) needed to establish a matter–antimatter imbalance in the infant universe. Sakharov’s three conditions for establishing a matter–antimatter imbalance are presented. Grand unified theories and experimental searches for proton decay are described. The concept of spontaneous symmetry breaking is introduced in describing the electroweak phase transition in the infant universe. That transition is treated as the potential site for introducing the imbalance between quarks and antiquarks, via either baryogenesis or leptogenesis models. The up–down quark mass difference is presented as essential for providing the stability of hydrogen and of the deuteron, which serves as a crucial stepping stone in stellar hydrogen-burning reactions that generate the energy and elements needed for life. Constraints on quark masses from lattice QCD calculations and violations of chiral symmetry are discussed.

Path integrals and the solution of the Schwinger model in curved space-time

1986 ◽  
Vol 33 (8) ◽  
pp. 2262-2266 ◽  
Author(s):  
J. Barcelos-Neto ◽  
Ashok Das
Keyword(s):  
Path Integrals ◽  
Space Time ◽  
Curved Space ◽  
Schwinger Model

scholarly journals Accidental SO(10) axion from gauged flavour

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Luca Di Luzio
Keyword(s):  
Mass Window ◽  
High Quality ◽  
High Scale ◽  
Quality Problem ◽  
Axion Mass ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Canonical Dimension ◽  
General Perspective ◽  
Effective Operators

Abstract An accidental U(1) Peccei-Quinn (PQ) symmetry automatically arises in a class of SO(10) unified theories upon gauging the SU(3)f flavour group. The PQ symmetry is protected by the ℤ4 × ℤ3 center of SO(10) × SU(3)f up to effective operators of canonical dimension six. However, high-scale contributions to the axion potential posing a PQ quality problem arise only at d = 9. In the pre-inflationary PQ breaking scenario the axion mass window is predicted to be ma ∈ [7 × 10−8, 10−3] eV, where the lower end is bounded by the seesaw scale and the upper end by iso-curvature fluctuations. A high-quality axion, that is immune to the PQ quality problem, is obtained for ma ≳ 2 0.02 eV. We finally offer a general perspective on the PQ quality problem in grand unified theories.

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