Particle Physics and Cosmology Inflation.
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Transcript of Particle Physics and Cosmology Inflation.
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Particle PhysicsParticle Physicsand Cosmologyand Cosmology
InflationInflation
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Friedman Universe :Friedman Universe :horizon grows with timehorizon grows with time
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flatness problemflatness problem
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ΩΩ=1 : unstable fixed =1 : unstable fixed pointpoint
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inflationary kinematicsinflationary kinematics
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exponential inflationexponential inflation
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end of inflationend of inflation
when when νν gets < 1 gets < 1
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e - foldingse - foldings
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inflationary cosmologyinflationary cosmologywith scalar fieldwith scalar field
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energy density and energy density and pressurepressure
crucial ingredient : shape of scalar potential Vcrucial ingredient : shape of scalar potential V
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field equationsfield equations
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flat region in potentialflat region in potential
change of scalar change of scalar is small effect ,is small effect ,V,H essentially constantV,H essentially constant
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slow roll parametersslow roll parameters
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single field inflation single field inflation
ifif
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slow roll approximationslow roll approximation
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slow roll approximationslow roll approximation
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νν ≈≈ - - εε
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chaotic inflationchaotic inflation
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slow roll conditionslow roll condition
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scales of fluctuationsscales of fluctuations
first out last infirst out last in
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e - foldingse - foldings
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