Proceedings of the XXII GIFT International Seminar on Theoretical Physics: QUANTUM GRAVITY AND COSMOLOGY

1992 ◽  
Author(s):  
Juan Pérez-Mercader ◽  
Joan Solà ◽  
Enric Verdaguer
Keyword(s):  
Quantum Gravity ◽  
Theoretical Physics ◽  
International Seminar

Gravity Quantized In Dimension 4

2014 ◽  
Vol 4 (1) ◽  
pp. 298-391
Author(s):  
Beyram Torbrand
Keyword(s):  
Quantum Gravity ◽  
Cross Sections ◽  
Particle Physics ◽  
Critical Dimension ◽  
Einstein Gravity ◽  
Theoretical Physics ◽  
Simple Quantum

This is a sequel to the article 'A More or Less Well-Behaved Quantum Gravity Lagrangean in Dimension 4?' in Advanced Studies in Theoretical Physics, Torbrand Dhrif[6]. We give a simple Quantum Gravity Lagrangean that behaves well, up to the standards of particle physics. Feynman calculus for cross-sections, and the diagrams involved, should behave good. The action is naively renormalizable, has critical dimension and is invariant under scalings in dimension 4. It implies standard Einstein gravity for a massless graviton.

Black Holes and Quantum Gravity

2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Aurélien Barrau
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Quantum Theory ◽  
Quantum Gravity ◽  
Gravitational Waves ◽  
Quantum Theory Of Gravitation ◽  
Theoretical Physics ◽  
Radio Interferometry ◽  
Theory Of Gravitation ◽  
Observational Science

The search for a quantum theory of gravitation is considered one of the most important problems in theoretical physics. Might black holes provide a key? Researchers are beginning to think that the emergence of a true black hole astronomy based on the measurement of gravitational waves and radio interferometry could bring quantum gravity into the field of experimental or observational science.

scholarly journals Emergent spacetime for quantum gravity

2016 ◽  
Vol 25 (13) ◽  
pp. 1645010 ◽  
Author(s):  
Hyun Seok Yang
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Quantum Gravity ◽  
Theoretical Physics ◽  
Hierarchy Problem ◽  
Cosmological Constant Problem ◽  
Cosmic Inflation ◽  
Thought Patterns ◽  
Emergent Spacetime ◽  
New Perspective

We emphasize that noncommutative (NC) spacetime necessarily implies emergent spacetime if spacetime at microscopic scales should be viewed as NC. In order to understand NC spacetime correctly, we need to deactivate the thought patterns that we have installed in our brains and taken for granted for so many years. Emergent spacetime allows a background-independent formulation of quantum gravity that will open a new perspective to resolve the notorious problems in theoretical physics such as the cosmological constant problem, hierarchy problem, dark energy, dark matter and cosmic inflation.

scholarly journals Study of gauge gravity duality using flow equation

Impact ◽  
2020 ◽  
Vol 2020 (5) ◽  
pp. 19-21
Author(s):  
Shuichi Yokoyama
Keyword(s):  
Quantum Information ◽  
String Theory ◽  
Quantum Gravity ◽  
Flow Equation ◽  
Theoretical Physics ◽  
Weak Force ◽  
Strong Force ◽  
The One ◽  
Gauge Gravity ◽  
Gravity Duality

There are four elementary forces of nature that describe every interaction in nature: gravity, electromagnetism, the strong force and the weak force. Of these, gravity is the most commonly known and the one that we are most familiar with, but it is still one of the most difficult to explain. Dr Shuichi Yokoyama, from the Yukawa Institute for Theoretical Physics at Kyoto University in Japan, has spent his career studying quantum gravity. Yokoyama is working with a team of researchers, including Dr Tetsuya Onogi and Dr Sinya Aoki, focusing on tackling the problems surrounding our current understanding of gravity by employing modern techniques of theoretical physics, including quantum information and string theory.

6. Frontiers of gravitational physics

2017 ◽  
pp. 83-97
Author(s):  
Timothy Clifton
Keyword(s):  
Quantum Mechanics ◽  
String Theory ◽  
Quantum Gravity ◽  
Cosmological Constant ◽  
Loop Quantum Gravity ◽  
Gravitational Interaction ◽  
Theoretical Description ◽  
Theoretical Physics ◽  
Cosmic Inflation ◽  
The World

‘Frontiers of gravitational physics’ considers some of the issues involved in the theoretical description of gravity. Since 1915, it has been Einstein’s theory that has shaped our understanding of the gravitational interaction, but a lot has happened in the world of theoretical physics since then. Quantum mechanics, devised by Bohr, Heisenberg, and Schrödinger, is incompatible with gravity and so has raised numerous questions. Several theories, including String Theory and Loop Quantum Gravity, have been proposed with some success. The concepts of cosmic inflation, the cosmological constant, and the possibility of multiple universes are also discussed. It concludes that with further astrophysical studies a new fundamental theory may explain it all.

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