Quantum Gravity

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A motivational talk about quantum gravity research.

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Quantum Gravity

  1. 1. Quantum Gravity Tapio Salminen
  2. 2. Chapter 1. Motivation
  3. 3. Theoretical physics
  4. 4. You should do things that make you happy!
  5. 6. Or could it possibly be?
  6. 8. Have to dig a little deeper...
  7. 9. “ 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
  8. 10. Chapter 2. Quantum gravity
  9. 11. Quantum Gravity Loops Horava gravity Quantum graphity NC QFT Strings
  10. 12. The heart of the problem - Einstein's equations
  11. 14. Geometry = Energy
  12. 15. Ideas of emergent gravity
  13. 16. String theory Ideas of emergent gravity A coherent state of gravitons A coherent state of gravitons
  14. 17. String theory A coherent state of gravitons Still background dependent! Ideas of emergent gravity A coherent state of gravitons
  15. 18. Loop quantum gravity <ul><li>Background independent
  16. 19. Problem of time </li></ul>Ideas of emergent gravity
  17. 20. The problem of time
  18. 21. The problem of time Quantum mechanics
  19. 22. The problem of time General relativity
  20. 23. “ 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
  21. 24. Quantum Gravity Loops Horava gravity Quantum graphity NC QFT Strings
  22. 25. Chapter 3. Quantum spacetime
  23. 26. Quantum theory
  24. 27. Quantum mechanics Quantum oscillator Quantum phase space
  25. 28. Quantum field theory Quantum fields and their excitations
  26. 29. Quantum coordinates Quantum spacetime
  27. 30. Looks like it will be very complicated...
  28. 31. Start with a usual, commutative , quantum field theory: Noncommutative quantum field theory
  29. 32. Noncommutative quantum field theory ...and insert modified products :
  30. 33. You will still have to check everything starting from scratch!
  31. 34. particles symmetries Interactions causality spin-statistics CPT Start checking!
  32. 35. So this is all just familiar calculations with a bit more math ?

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