Navin Seminar at AIMS
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Navin Seminar at AIMS

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Navin Seminar at AIMS Navin Seminar at AIMS Presentation Transcript

  • 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
  • what isinflation?
  • the universe isthe same inevery directionbut not quite
  • the sameexponential expansionsmoothinhomogeneitiesflatten universeeverything causallyconnected
  • not quitequantum fluctuationsstretched and frozenseed structure growth
  • negative pressurescalar field
  • slow rollflat(ish) potential ϕ
  • quantum fluctuations2 + 1 degrees offreedomtime dependentbackground
  • gauge invariancescalar ζfluctuationsconstant outsidehorizon
  • comoving wavenumbert
  • inflation is amazingflatness andhorizonsmonopolesgaussian and scaleinvariant
  • inflation is (too?)awesome
  • getting beyond“too” awesomeexperimentstensor modesnon-gaussianities
  • gaussian?2pt correlation functionis the whole storytemperature Ylm
  • non-gaussian?anything elsemodeldependent
  • bispectrumfNL
  • experiment
  • shape = physicstriangles in k-spacefNL(local) (sleight of handwarning)small in single field models
  • modelscurvatonmodulatedreheatingmultifield mixing
  • superhorizonevolutionadiabatic?
  • goalcompletelycapture generatingfNL and freezing ofperturbations
  • outlinemodeladiabaticityextensions
  • model
  • 2 field = isocurvatureisocurvature = trouble
  • multifieldmodels areincomplete!
  • track until adiabaticafter end thermal eq’m 1 fluidbefore end 1 field phase
  • multifield perturbtheory hardtime-dependentpdescheat – delta N
  • delta N switcheshard pdeproblem intoeasier ode one
  • observables
  • delta N
  • local,large fNL butisocurvaturecontinualsuperhorizonevolution
  • make isocurvatureheavy
  • dynamicquantity
  • summary
  • next?higher ptmore fields ?potentials?adiabaticity?
  • during inflation vs after inflation
  • thermal eq’mcurvatonmodulatedreheating
  • find toy modelthat capturesdistinctions intiming ofphysics
  • summarymaking perturbationsadiabatic kills fNL localin several existingmodels
  • how general? localfNL is trickymultifield modelsare incomplete