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.

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 NAMBU-JONA-LASINIO MODEL IN CURVED SPACE-TIME

1993 ◽  
Vol 08 (22) ◽  
pp. 2117-2123 ◽  
Author(s):  
T. INAGAKI ◽  
T. MUTA ◽  
S.D. ODINTSOV
Keyword(s):  
Proper Time ◽  
Space Time ◽  
Leading Order ◽  
Coupling Constant ◽  
Normal Coordinate ◽  
Dynamical Mass ◽  
Curved Space ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

The phase structure of Nambu-Jona-Lasinio model with N-component fermions in curved space-time is studied in the leading order of the 1/N expansion. The effective potential for composite operator [Formula: see text] is calculated by using the normal coordinate expansion in the Schwinger proper-time method. The existence of the first order phase transition caused by the change of the space-time curvature is confirmed and the dynamical mass of the fermion is calculated as a simultaneous function of the curvature and the four-fermion coupling constant. The phase diagram in the curvature and the coupling constant is obtained.

scholarly journals COMPLETE CLASSES OF GUTS WITH VANISHING ONE-LOOP BETA FUNCTIONS

1994 ◽  
Vol 09 (29) ◽  
pp. 5053-5075
Author(s):  
WOLFGANG LUCHA ◽  
FRANZ F. SCHÖBERL
Keyword(s):  
Gauge Coupling ◽  
Coupling Constants ◽  
Coupling Constant ◽  
Finiteness Conditions ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Dimensionless Coupling ◽  
The One ◽  
The Masses ◽  
Gauge Coupling Constant

By explicit solution of the one-loop finiteness conditions for all dimensionless coupling constants (i.e. the gauge coupling constant as well as Yukawa and quartic scalar-boson self-interaction coupling constants), two classes of grand unified theories characterized by renormalization-group beta functions which all vanish at least at the one-loop level are constructed and analyzed with respect to the (suspected) appearance of quadratic divergences, with the result that without exception in all of these models the masses of both vector and scalar bosons receive quadratically divergent one-loop contributions.

scholarly journals What if Newton’s Gravitational Constant Was Negative?

Galaxies ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 38
Author(s):  
Ismael Ayuso ◽  
José Mimoso ◽  
Nelson Nunes
Keyword(s):  
Field Theory ◽  
General Relativity ◽  
Gravitational Constant ◽  
Gravitational Coupling ◽  
Coupling Constant ◽  
De Sitter ◽  
Quadratic Potential ◽  
Gravitational Coupling Constant ◽  
General Scalar ◽  
Gravity Theories

In this work, we seek a cosmological mechanism that may define the sign of the effective gravitational coupling constant, G. To this end, we consider general scalar-tensor gravity theories as they provide the field theory natural framework for the variation of the gravitational coupling. We find that models with a quadratic potential naturally stabilize the value of G into the positive branch of the evolution and further, that de Sitter inflation and a relaxation to General Relativity is easily attained.

Photoproduction of Gravitons in Static Electromagnetic Fields

1975 ◽  
Vol 53 (20) ◽  
pp. 2306-2311 ◽  
Author(s):  
G. Papini ◽  
S. -R. Valluri
Keyword(s):  
Magnetic Dipole ◽  
Electromagnetic Fields ◽  
Cross Sections ◽  
Gravitational Coupling ◽  
External Fields ◽  
Coupling Constant ◽  
Gauge Invariant ◽  
Gravitational Coupling Constant ◽  
Extended Sources ◽  
Divergence Free

The cross sections for the process of photoproduction of gravitons in Coulomb and magnetic dipole external fields have been calculated. The calculation, which is linear in the gravitational coupling constant κ, is completely covariant, manifestly gauge invariant, and divergence free. The results to this order in κ are exact. Expressions for the case of extended sources have also been obtained and found to be in agreement with the results of other authors.

NEWTON'S GRAVITATIONAL COUPLING CONSTANT FROM A QUANTUM OF AREA

2011 ◽  
Vol 26 (17) ◽  
pp. 1301-1308 ◽  
Author(s):  
F. R. KLINKHAMER
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Internal Space ◽  
Gravitational Coupling ◽  
Coupling Constant ◽  
Range Interaction ◽  
Gravitational Coupling Constant ◽  
Final Formula ◽  
Equipartition Law ◽  
Energy Equipartition

A previous calculation of Newton's gravitational coupling constant G is generalized. This generalization makes it possible to have "atoms of two-dimensional space" with an integer dimension d atom of the internal space, where the case d atom = 1 is found to be excluded. Given the quantum of area l2, the final formula for G is inversely proportional to the logarithm of the integer d atom . The generalization used may be interpreted as a modification of the energy equipartition law of the microscopic degrees of freedom responsible for gravity, suggesting some form of long-range interaction between these degrees of freedom themselves.

scholarly journals Transport in a gravity dual with a varying gravitational coupling constant

2016 ◽  
Vol 94 (8) ◽  
Author(s):  
Antonio M. García-García ◽  
Bruno Loureiro ◽  
Aurelio Romero-Bermúdez
Keyword(s):  
Gravitational Coupling ◽  
Coupling Constant ◽  
Gravitational Coupling Constant
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