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Science Case Working Group

Science Case Working Group. Section 3: Inflation & Fundamental Physics Section 4: Gravity Waves from Inflation and the B-mode Polarization Contributors: P.Ferreira, S.Leach, A.Melchiorri, K.Land, L.Popa, M.Bucher, F.Finelli, S.Matarrese …. Inflation.

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Science Case Working Group

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  1. Science Case Working Group Section 3:Inflation & Fundamental Physics Section 4:Gravity Waves from Inflation and the B-mode Polarization Contributors: P.Ferreira, S.Leach, A.Melchiorri, K.Land, L.Popa, M.Bucher, F.Finelli, S.Matarrese …

  2. Inflation • Model defined by V(Φ) or V(Φ,Ψ,…) • Scalar and tensor perturbations

  3. Tegmark et al. Inflation Classes of models • Large field (chaotic) (Φ/μ)p, exp(Φ/μ) • Small field (1 - (Φ/μ)p) • Hybrid (2+ fields) (1+ (Φ/μ)p)

  4. Fundamental Physics Want to know the physics behind inflation • The New Cosmology (Strings/M-theory/Branes) making predictions (scalar fields, potential between branes,…) • Alternatives exist (pre-big bang, cyclic, ekpyrotic, …) We want to do more than constrain V How reliable are these predictions?

  5. Inflation - what we know so far Crude constraints on dynamics of inflation • WMAP3 consistent with adiabatic, Gaussian fluctuations • Tensor mode has not been detected • There could be some other contributions (cosmic strings, isocurvature, …) • ns≈ 0.96 ( < 1 at 95% CI) • Exclude quartic potentials, disfavour Hybrid • r ≤ 0.38

  6. Inflation - what we could know Amplitude of tensor mode fixes energy scale of inflation V1/4 = 3.3 x 1016 r1/4 GeV (current constraint V1/4 < 2.6 x 1016 GeV) Detection of tensor modes would: • Confirm that inflation took place • Determine energy scale • Constrain dynamics

  7. Lucia Popa Sensitivity Planck: r > 0.1 Should detect the lensed E modes (l>150) Clover/Quiet: r > 0.01 (1016 GeV) Can detect/rule out Large-field models. Bpol: r > 0.001

  8. Predictions • Large-fieldr > 0.01 High-field values  probing new territory beyond Planck scale. • Otherr could be 10-10 No guarantee of r detectable If Clover/Quiet find r<0.01, do we expect Bpol to do better?

  9. Bpol after Clover/QUIET • Models with 0.001 < r < 0.01  6 x 1015 < V1/4 < 1016 GeV • Fine tuning arguments  r > 0.01 ? • Impact of a null detection? r < 0.001 What does this tell us about fundamental physics? Inflation < GUT scale, impact on model building…

  10. Discussion Section 3: Inflation and Fundamental Physics Section 4: Gravity Waves, Polarization & Inflation • Overall tone & aim • How many branes? • Party line on expectation of r • Level of detail • Notation, etc.

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