Constraints on Supersymmetric Models of Hybrid Inflation

Abstract

We point out that the inclusion of a string component contributing around 5% to the CMB power spectrum amplitude on large scales can increase the preferred value of the spectral index n_s of density fluctuations measured by CMB experiments. While this finding applies to any cosmological scenario involving strings, we consider in particular models of supersymmetric hybrid inflation, which predict n_s >= 0.98, in tension with the CMB data when strings are not included. Using MCMC analysis we constrain the parameter space allowed for F- and D-term inflation. For the F-term model, using minimal supergravity corrections, we find that \logκ= -2.34\pm 0.38 and M= (0.518\pm 0.059) * 10^16 GeV. The inclusion of non-minimal supergravity corrections can modify these values somewhat. In the corresponding analysis for D-term inflation, we find \logκ= -4.24\pm 0.19 and m_FI= (0.245\pm 0.031) * 10^16 GeV. Under the assumption that these models are correct, these results represent precision measurements of important parameters of a Grand Unified Theory. We consider the possible uncertainties in our measurements and additional constraints on the scenario from the stochastic background of gravitational waves produced by the strings. The best-fitting model predicts a B-mode polarization signal \approx 0.3 μK rms peaking at l \approx 1000. This is of comparable amplitude to the expected signal due to gravitational lensing of the adiabatic E-mode signal on these scales.

21 pages, 16 figures

References in corpus (12)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
• Inflation after WMAP3: Confronting the Slow-Roll and Exact Power Spectra with CMB Data
• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• Inflation model constraints from the Wilkinson Microwave Anisotropy Probe three-year data
• Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
• Anatomy of F_D-Term Hybrid Inflation
• B polarization of cosmic microwave background as a tracer of strings
• Ultraviolet Regularisation in de Sitter Space
• Constraints on Topological Defects Energy Density from First-Year WMAP Results

Cited by in corpus (38)

• Fitting CMB data with cosmic strings and inflation
• Inflaton Decay in Supergravity
• New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• CMB polarization power spectra contributions from a network of cosmic strings
• Spontaneous B-L Breaking as the Origin of the Hot Early Universe
• The 21 cm Signature of Cosmic String Wakes
• Cosmic microwave anisotropies from BPS semilocal strings
• The CMB temperature bispectrum induced by cosmic strings
• Observable Gravity Waves from Supersymmetric Hybrid Inflation II
• Update of D3/D7-Brane Inflation on K3 x T^2/Z_2
• Cosmic Strings from Supersymmetric Flat Directions
• Constraints on the Nambu-Goto cosmic string contribution to the CMB power spectrum in light of new temperature and polarisation data
• Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics
• Observing cosmic string loops with gravitational lensing surveys
• Observable Gravity Waves From Supersymmetric Hybrid Inflation
• Constraints on Brane Inflation and Cosmic Strings
• CMB power spectrum of Nambu-Goto cosmic strings
• Bubbling the False Vacuum Away
• Detecting and distinguishing topological defects in future data from the CMBPol satellite
• On the degeneracy between primordial tensor modes and cosmic strings in future CMB data from Planck
• Kaehler Potentials for Hilltop F-term Hybrid Inflation
• Towards Matter Inflation in Heterotic String Theory
• Rotation of galaxies as a signature of cosmic strings in weak lensing surveys
• Semi-shifted hybrid inflation with B-L cosmic strings
• Production of Topological Defects at the End of Inflation
• Reducing the spectral index in F-term hybrid inflation through a complementary modular inflation
• Tachyon Mediated Non-Gaussianity
• Brane Inflation and the Overshoot Problem
• Cosmic String Dynamics and Evolution in Warped Spacetime
• Cosmic Strings and the Origin of Globular Clusters
• Textures and Semi-Local Strings in SUSY Hybrid Inflation
• Supergravity and Two-Field Inflation Effects in Right-Handed Sneutrino-Modified D-term Inflation
• Updated Constraints on Large Field Hybrid Inflation
• Large non-Gaussianity generated at the end of Extended D-term Hybrid Inflation
• Supersymmetric inflation and baryogenesis via Extra-Flat directions of the MSSM
• Inflation and Unification
• Phenomenology and Cosmology of Supersymmetric Grand Unified Theories