Information about Quantum Gravity

A motivational talk about quantum gravity research.

Chapter 1. Motivation

Theoretical physics

You should do things that make you happy!

Or could it possibly be?

Have to dig a little deeper...

“ Curiosity is a powerful human impulse – some distance below sex and greed, I grant you, but far ahead of altruism – and I was simply curious.” -- Robert Harris, Ghost

Chapter 2. Quantum gravity

Quantum Gravity Loops Horava gravity Quantum graphity NC QFT Strings

The heart of the problem - Einstein's equations

Geometry = Energy

Ideas of emergent gravity

String theory Ideas of emergent gravity A coherent state of gravitons A coherent state of gravitons

String theory A coherent state of gravitons Still background dependent! Ideas of emergent gravity A coherent state of gravitons

Loop quantum gravity Background independent Problem of time Ideas of emergent gravity

Background independent

Problem of time

The problem of time

The problem of time Quantum mechanics

The problem of time General relativity

“ Motion and change are primary. Nothing is, except in a very approximate and temporary sense. ... if we want to think fundamentally we must not lose sight of the essential fact that 'is' is an illusion.” -- Lee Smolin

Quantum Gravity Loops Horava gravity Quantum graphity NC QFT Strings

Chapter 3. Quantum spacetime

Quantum theory

Quantum mechanics Quantum oscillator Quantum phase space

Quantum field theory Quantum fields and their excitations

Quantum coordinates Quantum spacetime

Looks like it will be very complicated...

Start with a usual, commutative , quantum field theory: Noncommutative quantum field theory

Noncommutative quantum field theory ...and insert modified products :

You will still have to check everything starting from scratch!

particles symmetries Interactions causality spin-statistics CPT Start checking!

So this is all just familiar calculations with a bit more math ?

Quantum gravity (QG) is a field of theoretical physics that seeks to describe the force of gravity according to the principles of quantum mechanics, and ...

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Andrés Gomberoff, Donald Marolf: Lectures on quantum gravity. Springer, New York 2005, ISBN 0-387-23995-2; Carlo Rovelli: Quantum gravity. Univ.

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Quantum Gravity (QG) is a uniquely-positioned, proprietary brand of sunglasses distributed directly to the consumer and leveraging the power of social e ...

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Quantum Gravity, broadly construed, is a physical theory (still ‘under construction’) incorporating both the principles of general ...

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A quantum gravity model based on a truly infinitesimal (Hilbert space) geometry

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Loop quantum gravity (LQG) is a theory that attempts to describe the quantum properties of the universe and gravity. It is also a theory of quantum ...

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QUANTUM GRAVITY Quantum cosmology M-theory, the theory formerly known as Strings The Holographic Principle and M-theory [Black holes] [Cosmic strings] ...

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Quantum gravity, or unified field theory, is an attempt to unify Einstein's theory of general relativity with quantum physics.

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This division is concerned with the unification of general relativity and quantum mechanics into a theory of quantum gravity, which should also provide a ...

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What is Quantum Gravity? According to our current knowledge, the foundations of physics rest on two guiding principles: General Relativity (GR) and Quantum ...

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