The fundamental forces or fundamental interactions of physics are the ways that individual particles interact with each other. It turns out that every single interaction observed taking place in the universe can be broken down and described by only four well, generally four—more on that later types of interactions:. Of the fundamental forces, gravity has the farthest reach, but it's the weakest in actual magnitude. It is a purely attractive force which reaches through even the "empty" void of space to draw two masses toward each other. It keeps the planets in orbit around the sun and the moon in orbit around the Earth. Gravitation is described under the theory of general relativity , which defines it as the curvature of spacetime around an object of mass.
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LQG-group | Muxin Han’s research group on Quantum Gravity
Quantum Gravity and the Functional Renormalization Group: The Road Towards Asymptotic Safety Martin Reuter , Frank Saueressig During the past two decades the gravitational asymptotic safety scenario has undergone a major transition from an exotic possibility to a serious contender for a realistic theory of quantum gravity. It aims at a mathematically consistent quantum description of the gravitational interaction and the geometry of spacetime within the realm of quantum field theory, which keeps its predictive power at the highest energies. This volume provides a self-contained pedagogical introduction to asymptotic safety, and introduces the functional renormalization group techniques used in its investigation, along with the requisite computational techniques. The foundational chapters are followed by an accessible summary of the results obtained so far. It is the first detailed exposition of asymptotic safety, providing a unique introduction to quantum gravity and it assumes no previous familiarity with the renormalization group. It serves as an important resource for both practising researchers and graduate students entering this maturing field. ISBN
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Quantum Gravity and Quantum Information
What is the hottest problem in fundamental physics today? Physics aficionados most probably would answer: quantum gravity. Of all the fundamental forces of nature, only gravity still stands outside the rubric of the quantum theory.
Bronstein figured out how to describe gravity in terms of quantized particles, now called gravitons, but only when the force of gravity is weak — that is in general relativity , when the space-time fabric is so weakly curved that it can be approximated as flat. His words were prophetic. Perhaps, given the chance, the whip-smart Bronstein might have helped to speed things along.