scholarly journals Nonclassical cosmological dynamics in the low-energy limit of loop quantum scalar-tensor theory

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Yu Han
Keyword(s):  
Low Energy ◽  
Scalar Tensor Theory ◽  
Energy Limit ◽  
Tensor Theory

A SCALAR-TENSOR THEORY FOR INDUCED GRAVITY

1987 ◽  
Vol 02 (01) ◽  
pp. 179-194 ◽  
Author(s):  
H. BOUTALEB-J. ◽  
A. L. MARRAKCH
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Gravitational Constant ◽  
Low Energy ◽  
Scalar Tensor Theory ◽  
Energy Limit ◽  
Potential Minimum ◽  
Induced Gravity ◽  
Tensor Theory ◽  
The Universe

A scalar-tensor theory for induced gravity is presented. Einstein's gravity appears as the low-energy limit of such a theory. It is shown that the spontaneous symmetry breaking can occur at any epoch of the universe and that this mechanism can also be responsible for breaking the unified gauge group SU(5) into SU (3) × SU (2) × U (1). Also, it is shown that, if the spontaneous symmetry breaking is accomplished by means of the Coleman-Weinberg potential minimum, the induced gravitational constant can, with a suitable choice of the coupling function, increase as one dates back.

scholarly journals String Theory Explanation of Galactic Rotation Found Using the Geodesic Constraint

2019 ◽  
Vol 2019 ◽  
pp. 1-4
Author(s):  
Mark D. Roberts
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Galactic Rotation ◽  
Spherically Symmetric ◽  
Scalar Tensor Theory ◽  
De Sitter ◽  
Energy Limit ◽  
Field Equations ◽  
Tensor Theory ◽  
Spherically Symmetric Metric

The unique spherically symmetric metric which has vanishing Weyl tensor, is asymptotically de-Sitter, and can model constant galactic rotation curves is presented. Two types of field equations are shown to have this metric as an exact solution. The first is Palatini varied scalar-tensor theory. The second is the low energy limit of string theory modified by inclusion of a contrived potential.

scholarly journals ON THE ENTROPY OF MINIMALLY COUPLED AND NONMINIMALLY COUPLED GRAVITIES

1996 ◽  
Vol 11 (25) ◽  
pp. 2037-2045 ◽  
Author(s):  
JEONG-WON HO ◽  
YONGDUK KIM ◽  
YOUNG-JAI PARK
Keyword(s):  
Black Hole ◽  
Thermodynamic Properties ◽  
Conformal Transformation ◽  
Low Energy ◽  
Bosonic String ◽  
Effective Theory ◽  
Scalar Tensor Theory ◽  
Tensor Theory ◽  
Theory Of Gravity ◽  
Electrically Charged

We investigate whether the gravitational thermodynamic properties of the scalar-tensor theory of gravity are affected by the conformal transformation or not. As an explicit example, we consider an electrically charged static spherical black hole in four-dimensional low energy effective theory of bosonic string.

scholarly journals Field Independent Cosmic Evolution

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Nayem Sk ◽  
Abhik Kumar Sanyal
Keyword(s):  
Higher Order ◽  
Noether Symmetry ◽  
Scalar Tensor Theory ◽  
Anisotropic Model ◽  
Tachyonic Field ◽  
Tensor Theory ◽  
Cosmic Evolution ◽  
Field Independent ◽  
Conserved Current ◽  
Theory Of Gravity

It has been shown earlier that Noether symmetry does not admit a form of corresponding to an action in which is coupled to scalar-tensor theory of gravity or even for pure theory of gravity taking anisotropic model into account. Here, we prove that theory of gravity does not admit Noether symmetry even if it is coupled to tachyonic field and considering a gauge in addition. To handle such a theory, a general conserved current has been constructed under a condition which decouples higher-order curvature part from the field part. This condition, in principle, solves for the scale-factor independently. Thus, cosmological evolution remains independent of the form of the chosen field, whether it is a scalar or a tachyon.

Some results in the general scalar tensor theory

1984 ◽  
Vol 102 (2) ◽  
pp. 223-228
Author(s):  
Tarkeshwar Singh ◽  
T. Singh
Keyword(s):  
Scalar Tensor Theory ◽  
Tensor Theory ◽  
General Scalar

GALACTIC AND ASTROPHYSICAL SIZES FROM SCALAR-TENSOR THEORY OF GRAVITY

2004 ◽  
Vol 13 (02) ◽  
pp. 359-371 ◽  
Author(s):  
GIUSEPPE BASINI ◽  
MARCO RICCI ◽  
FULVIO BONGIORNO ◽  
SALVATORE CAPOZZIELLO
Keyword(s):  
Scalar Field ◽  
Spiral Galaxies ◽  
Weak Field ◽  
Newtonian Potential ◽  
Scalar Tensor Theory ◽  
Field Limit ◽  
Weak Field Limit ◽  
Tensor Theory ◽  
Flat Rotation Curves ◽  
Theory Of Gravity

We investigate the weak-field limit of scalar-tensor theory of gravity and show that results are directly depending on the coupling and self-interaction potential of the scalar field. In particular, corrections are derived for the Newtonian potential. We discuss astrophysical applications of the results, in particular the flat rotation curves of spiral galaxies.

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