scholarly journals NONLOCAL EFFECTS IN QUANTUM GRAVITY

1998 ◽  
Vol 13 (37) ◽  
pp. 2965-2969 ◽  
Author(s):  
ALI SHOJAI ◽  
FATIMAH SHOJAI ◽  
MEHDI GOLSHANI
Keyword(s):  
Quantum Gravity ◽  
Quantum Effects ◽  
Space Time ◽  
Gravity Theory ◽  
Degree Of Freedom ◽  
Nonlocal Effects

Recently,2 a new quantum gravity theory was presented in which the quantum effects were represented by the conformal degree of freedom of the space–time metric. In this letter we show that in the framework of this theory, quantum gravity is nonlocal.

scholarly journals CONFORMAL TRANSFORMATIONS AND QUANTUM GRAVITY

1998 ◽  
Vol 13 (34) ◽  
pp. 2725-2729 ◽  
Author(s):  
FATIMAH SHOJAI ◽  
ALI SHOJAI ◽  
MEHDI GOLSHANI
Keyword(s):  
Quantum Gravity ◽  
Conformal Transformation ◽  
Quantum Effects ◽  
Space Time ◽  
Gravity Theory ◽  
Degree Of Freedom ◽  
Scale Transformation ◽  
Conformal Transformations ◽  
Physical Quantities

Recently,1 it was shown that quantum effects of matter could be identified with the conformal degree of freedom of the space–time metric. Accordingly, one can introduce quantum effects either by making a scale transformation (i.e. changing the metric), or by making a conformal transformation (i.e. changing all physical quantities). These two ways are investigated and compared. Also, it is argued that, the ultimate formulation of such a quantum gravity theory should be in the framework of the scalar–tensor theories.

scholarly journals QUANTUM, GRAVITY AND GEOMETRY

2000 ◽  
Vol 15 (12) ◽  
pp. 1757-1771 ◽  
Author(s):  
ALI SHOJAI
Keyword(s):  
Black Holes ◽  
Quantum Gravity ◽  
Causal Structure ◽  
Quantum Effects ◽  
Space Time ◽  
Gravity Theory ◽  
Degree Of Freedom ◽  
The Other ◽  
Back Reaction ◽  
Gravitational Effects

Recently,1–3 it is shown that, the quantum effects of matter are well described by the conformal degree of freedom of the space–time metric. On the other hand, it is a well-known fact that according to Einstein's gravity theory, gravity and geometry are interconnected. In the new quantum gravity theory,1–3 matter quantum effects completely determine the conformal degree of freedom of the space–time metric, while the causal structure of the space–time is determined by the gravitational effects of the matter, as well as the quantum effects through back reaction effects. This idea, previously, is realized in the framework of scalar–tensor theories. In this work, it is shown that quantum gravity theory can also be realized as a purely metric theory. Such a theory is developed, its consequences and its properties are investigated. The theory is applied, then, to black holes and the radiation-dominated universe. It is shown that the initial singularity can be avoided.

scholarly journals SCALAR–TENSOR THEORIES AND QUANTUM GRAVITY

1998 ◽  
Vol 13 (36) ◽  
pp. 2915-2922 ◽  
Author(s):  
FATIMAH SHOJAI ◽  
ALI SHOJAI ◽  
MEHDI GOLSHANI
Keyword(s):  
Quantum Gravity ◽  
Causal Structure ◽  
Quantum Effects ◽  
Space Time ◽  
Degree Of Freedom ◽  
Unified Theory ◽  
Gravitational Effects ◽  
Geometrical Features

Recently, it was shown that the quantum effects of the matter, could be used to determine the conformal degree of freedom of the space–time metric. So both gravity and quantum are geometrical features. Gravity determines the causal structure of the space–time, while quantum determines the scale of the space–time. In this letter, it is shown that it is possible to use the scalar-tensor framework to build a unified theory in which both quantum and gravitational effects are present.

scholarly journals Collision Space-Time.  Unified Quantum Gravity. Gravity is Lorentz Symmetry Break Down at the Planck Scale

2019 ◽  
Author(s):  
Espen Haug
Keyword(s):  
Wave Equation ◽  
Quantum Gravity ◽  
Planck Scale ◽  
Lorentz Symmetry ◽  
Space Time ◽  
Gravity Theory ◽  
Relativistic Wave Equation ◽  
Relativistic Energy ◽  
Modern Physics ◽  
Heisenberg Uncertainty

We have recently presented a unified quantum gravity theory [1]. Here we extend on that work and present an even simpler version of that theory. For about hundred years, modern physics has not been able to build a bridge between quantum mechanics and gravity. However, a solution may be found here; we present our quantum gravity theory, which is rooted in indivisible particles where matter and gravity are related to collisions and can be described by collision space-time. In this paper, we also show that we can formulate a quantum wave equation rooted in collision space-time, which is equivalent to mass and energy.The beauty of our theory is that most of the main equations that currently exist in physics are not changed (in terms of predictions), except at the Planck scale. The Planck scale is directly linked to gravity and gravity is, surprisingly, actually a Lorentz symmetry as well as a form of Heisenberg uncertainty break down at the Planck scale. Our theory gives a dramatic simplification of many physics formulas without altering the output predictions. The relativistic wave equation, the relativistic energy momentum relation, and Minkowski space can all be represented by simpler equations when we understand mass at a deeper level. This not attained at a cost, but rather a reflection of the benefit in having gravity and electromagnetism unified under the same theory.

scholarly journals A New Interpretation of the Origin of Gravity and Conceptual Foundations of Newtonian mechanics at the Micro Level

2019 ◽  
Author(s):  
wei fan ◽  
wei fan ◽  
wei fan
Keyword(s):  
Field Theory ◽  
Quantum Gravity ◽  
Ideal Fluid ◽  
Space Time ◽  
Gravity Theory ◽  
Analytical Mechanics ◽  
Newtonian Mechanics ◽  
Micro Level ◽  
New Interpretation ◽  
Time Density

Because Newton's gravity and Einstein's general theory of relativity are macroscopic gravitational theories, therefore, this paper attempts to establish a set of quantum gravity theory of the microscopic expression of Newton's and Einstein's theory of gravity to make up for the shortcomings of the existing macro-gravity theory at the micro level, and further develop the macroscopic gravity theory into the microscopic field. Based on the cognition of the field theory model, from the general assumption, space-time is further regarded as an ideal fluid, from the perspective of the distribution of ideal fluid density, this paper derives the Newton's universal gravitational equation and Einstein's general relativity equation. On the micro level, the gravitational field is further interpreted as a gradient field of space-time density; the Newtonian potential is further interpreted as the density of an object at the micro level; gravity is further interpreted as the potential pressure(space-time pressure) exhibited by the gradient of the density of the object at the micro level; flection space-time is further interpreted as the embodiment of the gradient distribution of the ideal fluid (space-time) density at the micro level. Therefore, this paper establishes a new set of quantum gravity theory, which can solve some pain points in the theory of macroscopic gravity. At the same time, based on the new interpretation of Newton's mechanics concept foundation based on field theory, this paper also proposes a new paradigm theory independent of Newtonian mechanics and analytical mechanics, which can solve some pain points in Newtonian mechanics and analytical mechanics.

scholarly journals NONMINIMAL SCALAR–TENSOR THEORIES AND QUANTUM GRAVITY

2000 ◽  
Vol 15 (13) ◽  
pp. 1859-1868 ◽  
Author(s):  
FATIMAH SHOJAI ◽  
ALI SHOJAI
Keyword(s):  
Scalar Field ◽  
Quantum Gravity ◽  
Equations Of Motion ◽  
Quantum Effects ◽  
Scalar Fields ◽  
Quantum Potential ◽  
Degree Of Freedom ◽  
Scalar Tensor Theory ◽  
Tensor Theory ◽  
Correct Form

Recently1it has been shown that the quantum effects of matter determine the conformal degree of freedom of the space–time metric. This was done in the framework of a scalar–tensor theory with one scalar field.2,3A point with that theory is that the form of quantum potential is preassumed. Here we present a scalar–tensor theory with two scalar fields, and no assumption on the form of quantum potential. It is shown that using the equations of motion one gets the correct form of quantum potential plus some corrections.

Topology knots and hierarchy problem

2019 ◽  
Author(s):  
Vitaly Kuyukov
Keyword(s):  
Quantum Theory ◽  
String Theory ◽  
Quantum Gravity ◽  
Dimensional Space ◽  
Space Time ◽  
Elementary Particles ◽  
Hierarchy Problem ◽  
Topological Quantum ◽  
Dimensional Space Time ◽  
New Formula

Many approaches to quantum gravity consider the revision of the space-time geometry and the structure of elementary particles. One of the main candidates is string theory. It is possible that this theory will be able to describe the problem of hierarchy, provided that there is an appropriate Calabi-Yau geometry. In this paper we will proceed from the traditional view on the structure of elementary particles in the usual four-dimensional space-time. The only condition is that quarks and leptons should have a common emerging structure. When a new formula for the mass of the hierarchy is obtained, this structure arises from topological quantum theory and a suitable choice of dimensional units.

scholarly journals QUANTUM GRAVITY AND TURBULENCE

2010 ◽  
Vol 19 (14) ◽  
pp. 2311-2317 ◽  
Author(s):  
VISHNU JEJJALA ◽  
DJORDJE MINIC ◽  
Y. JACK NG ◽  
CHIA-HSIUNG TZE
Keyword(s):  
String Theory ◽  
Quantum Gravity ◽  
Space Time ◽  
Recent Advances

We apply recent advances in quantum gravity to the problem of turbulence. Adopting the AdS/CFT approach we propose a string theory of turbulence that explains the Kolmogorov scaling in 3 + 1 dimensions and the Kraichnan and Kolmogorov scalings in 2 + 1 dimensions. In the gravitational context, turbulence is intimately related to the properties of space–time or quantum foam.

scholarly journals Los principios de la relatividad: una introducci´on pedag´ogica

2018 ◽  
Vol 64 (1) ◽  
pp. 87
Author(s):  
Y. Bonder ◽  
E. Okon
Keyword(s):  
Quantum Gravity ◽  
Gravity Theory ◽  
Theory Of Relativity

The principles underlying the theory of relativity, special and general, are presented. An easy to follow and pedagogical language is used and, based on physical examples, the motivation and some consequences of such principles are discussed. In addition, some roles of these principles when looking for a quantum gravity theory are mentioned

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