Navin Seminar at AIMS

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Navin Seminar at AIMS

  1. 1. non-gaussianitiesin multifieldinflation: theapproach toadiabaticity and thefate of fnlnavin sivanandam[1011.4934 and 1104.5238 – joel meyers, ns]a.i.m.s. – 21st november 2011
  2. 2. what isinflation?
  3. 3. the universe isthe same inevery directionbut not quite
  4. 4. the sameexponential expansionsmoothinhomogeneitiesflatten universeeverything causallyconnected
  5. 5. not quitequantum fluctuationsstretched and frozenseed structure growth
  6. 6. negative pressurescalar field
  7. 7. slow rollflat(ish) potential ϕ
  8. 8. quantum fluctuations2 + 1 degrees offreedomtime dependentbackground
  9. 9. gauge invariancescalar ζfluctuationsconstant outsidehorizon
  10. 10. comoving wavenumbert
  11. 11. inflation is amazingflatness andhorizonsmonopolesgaussian and scaleinvariant
  12. 12. inflation is (too?)awesome
  13. 13. getting beyond“too” awesomeexperimentstensor modesnon-gaussianities
  14. 14. gaussian?2pt correlation functionis the whole storytemperature Ylm
  15. 15. non-gaussian?anything elsemodeldependent
  16. 16. bispectrumfNL
  17. 17. experiment
  18. 18. shape = physicstriangles in k-spacefNL(local) (sleight of handwarning)small in single field models
  19. 19. modelscurvatonmodulatedreheatingmultifield mixing
  20. 20. superhorizonevolutionadiabatic?
  21. 21. goalcompletelycapture generatingfNL and freezing ofperturbations
  22. 22. outlinemodeladiabaticityextensions
  23. 23. model
  24. 24. 2 field = isocurvatureisocurvature = trouble
  25. 25. multifieldmodels areincomplete!
  26. 26. track until adiabaticafter end thermal eq’m 1 fluidbefore end 1 field phase
  27. 27. multifield perturbtheory hardtime-dependentpdescheat – delta N
  28. 28. delta N switcheshard pdeproblem intoeasier ode one
  29. 29. observables
  30. 30. delta N
  31. 31. local,large fNL butisocurvaturecontinualsuperhorizonevolution
  32. 32. make isocurvatureheavy
  33. 33. dynamicquantity
  34. 34. summary
  35. 35. next?higher ptmore fields ?potentials?adiabaticity?
  36. 36. during inflation vs after inflation
  37. 37. thermal eq’mcurvatonmodulatedreheating
  38. 38. find toy modelthat capturesdistinctions intiming ofphysics
  39. 39. summarymaking perturbationsadiabatic kills fNL localin several existingmodels
  40. 40. how general? localfNL is trickymultifield modelsare incomplete

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