Quantum Gravity
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Quantum Gravity

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A motivational talk about quantum gravity research.

A motivational talk about quantum gravity research.

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Quantum Gravity Quantum Gravity Presentation Transcript

  • Quantum Gravity 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
  • 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
  • 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 ?