Post on 19-Jan-2015
description
QuantumG rav ity
Tapio Salminen
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
QuantumG rav ity
Loops
Horavagravity
Quantumgraphity
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
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
QuantumG rav ity
Loops
Horavagravity
Quantumgraphity
NC QFT
Strings
Chapter 3.
Quantum spacetime
Quantum theory
Quantum mechanics
Quantum oscillator
Quantum phase space
Quantum field theory
Quantum felds
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?