scholarly journals Foundations of fundamental mechanics (1)

2019 ◽  
Author(s):  
Thomas Blommaert ◽  
Michael Appleby
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
General Theory ◽  
Potential Field ◽  
Quantum Physics ◽  
Space Time ◽  
Quantum Field ◽  
Theory Of Relativity ◽  
General Theory Of Relativity

The following paper presents a description on the fundamental mechanics of nature.This is the first of a set of papers entitled Foundations of fundamental mechanics, in which this first paper is specifically on the nature of gravity.For all intents and purposes this paper is NOT intended to be a replacement for the General theory of Relativity (GR) (A. Einstein 1915–1916), rather it is intended to be a complimentary extension of its work, with the purpose of extending it into quantum physics. Most notably, to relate it to quantum field theory (QFT), by quantizing the metric of space-time into a potential field theory.

scholarly journals On the feasibility of charged wormholes

Open Physics ◽  
2011 ◽  
Vol 9 (5) ◽  
Author(s):  
Peter Kuhfittig
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
General Theory ◽  
Quantum Field ◽  
Theory Of Relativity ◽  
Extended Version ◽  
General Theory Of Relativity ◽  
Fields Equations

AbstractWhile wormhole spacetimes are predictions of the general theory of relativity, specific solutions may not be compatible with quantum field theory. This paper modifies the charged wormhole model of Kim and Lee with the aim of satisfying an extended version of a quantum inequality due to Ford and Roman. The modified metric may be viewed as a solution of the Einstein fields equations representing a charged wormhole that is compatible with quantum field theory.

scholarly journals A New Approach to Quantum Gravity

2020 ◽  
pp. 1-15
Author(s):  
Gang Lee
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Gravitational Field ◽  
Field Equation ◽  
General Theory ◽  
Feynman Integral ◽  
Quantum Field ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
New Approach

In this paper, we introduce a different approach to the theory of gravitational field. This method can give the semiclassical graviton directly. We discuss the dynamics and quantization of graviton and obtain the field equation of graviton. Also we give proof to prove that the quantum field theory constructed in this paper is classically equivalent to the general theory of relativity. We obtain the Green’s function of the graviton by the field equation, and the difficulty of Feynman integral divergence can be solved by this method.

scholarly journals We have confidence to lead gravitational-wave science: an interview with Yueliang Wu

2017 ◽  
Vol 4 (5) ◽  
pp. 718-720
Author(s):  
Hepeng Jia
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Gravitational Wave ◽  
Theoretical Physics ◽  
Quantum Field ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
Chinese Academy Of Sciences ◽  
Wave Research ◽  
Academy Of Sciences

Abstract Yueliang Wu, chief scientist of Taiji Program, is a well-known theoretical physicist and the Vice-President of the University of Chinese Academy of Sciences (UCAS). Taiji Program, initially proposed in 2008, is one of China's ambitious plans to observe gravitational waves. Obtaining his Ph.D. at the Institute of Theoretical Physics (ITP) under the Chinese Academy of Sciences (CAS) in 1987, Wu had been working at Dortmund University and Mainz University in Germany and Carnegie-Mellon University and the Ohio-State University in the USA. In 1996, he joined the ITP and became its director in 2007. He has also served as the Director of the Kavli Institute for Theoretical Physics China at the CAS since 2006. In 2007, he was elected as a CAS member.  Wu's research is focused on elementary particle physics, quantum field theory, symmetry principle and cosmophysics. In recent years, he has been proposing a gravitational quantum field theory as a new approach to reconciling the general theory of relativity and quantum mechanics. The most fundamental unanswered question of the general theory of relativity is how general relativity can be reconciled with the laws of quantum physics to produce a complete and self-consistent theory of quantum gravity. To extend the general relativity to realize the reconciliation, Wu suggested a basic gravitational field be needed in the future model.  Since 2012, he, together with Wenrui Hu, has been working as Taiji Program's chief scientist and promoting nationwide gravitational-wave research. National Science Review (NSR) spoke with Wu about the future of gravitational-wave research, the development of China's nationwide gravitational-wave studies and particularly the progress of Taiji Program.

scholarly journals Classification of quantum states based on the null energy condition

2021 ◽  
Vol 36 (25) ◽  
pp. 2150183
Author(s):  
Susobhan Mandal
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Coherent States ◽  
Energy Condition ◽  
Null Energy Condition ◽  
Quantum States ◽  
Quantum Field ◽  
Theory Of Relativity ◽  
General Theory Of Relativity

Violation of the null energy condition plays an important role both in the general theory of relativity and quantum field theory in curved spacetimes. Over the years, it has been shown that the violation of the null energy condition leads to instability and violation of causality. In quantum field theory, violation of the energy condition also depends on the quantum states apart from the geometry of curved spacetime. Hence, the quantum effects play an important role in the violation of the null energy condition. We show that the set of all the coherent states does not violate the null energy condition. Further, we also show that under certain conditions, the null energy condition is violated either by a pure state or a mixed state. Furthermore, the dynamical violation of the null energy condition by the quantum states is also discussed here.

scholarly journals Analyticity Properties and Thermal Effects for General Quantum Field Theory on de Sitter Space-Time

1998 ◽  
Vol 196 (3) ◽  
pp. 535-570 ◽  
Author(s):  
Jacques Bros ◽  
Henri Epstein ORF RID="a3"> ◽  
Ugo Moschella
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Thermal Effects ◽  
De Sitter Space ◽  
Space Time ◽  
Quantum Field ◽  
De Sitter ◽  
General Quantum

scholarly journals ε-EXPANSION IN QUANTUM FIELD THEORY IN CURVED SPACE–TIME

1998 ◽  
Vol 13 (16) ◽  
pp. 2857-2874
Author(s):  
IVER H. BREVIK ◽  
HERNÁN OCAMPO ◽  
SERGEI ODINTSOV
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Space Time ◽  
Quantum Field ◽  
Curved Space ◽  
Njl Model ◽  
Effective Lagrangian ◽  
Special Solutions ◽  
Curvature Approximation ◽  
Symmetric Phase

We discuss ε-expansion in curved space–time for asymptotically free and asymptotically nonfree theories. The existence of stable and unstable fixed points is investigated for fϕ4 theory and SU(2) gauge theory. It is shown that ε-expansion maybe compatible with aysmptotic freedom on special solutions of the RG equations in a special ase (supersymmetric theory). Using ε-expansion RG technique, the effective Lagrangian for covariantly constant gauge SU(2) field and effective potential for gauged NJL model are found in (4-ε)-dimensional curved space (in linear curvature approximation). The curvature-induced phase transitions from symmetric phase to asymmetric phase (chromomagnetic vacuum and chiral symmetry broken phase, respectively) are discussed for the above two models.

Introductory review on quantum field theory with space–time resolution

2010 ◽  
Vol 51 (4) ◽  
pp. 315-330 ◽  
Author(s):  
T. Cheng ◽  
Q. Su ◽  
R. Grobe
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Time Resolution ◽  
Space Time ◽  
Quantum Field ◽  
Introductory Review
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