Nonperturbative infrared enhancement of nonGaussian correlators in de Sitter space

Abstract

We compute the four-point correlation function of a light O(N) scalar field in de Sitter space in the large-N limit. For superhorizon momentum modes, infrared effects strongly enhance the size of loop contributions. We find that in the deep infrared limit, the latter are of the same order as the tree-level one. The tree-level momentum structure, characteristic of a contact term, gets renormalized by a factor of order unity. In addition loop contributions give rise to a new momentum structure, characteristic of an exchange diagram, corresponding to the exchange of an effective composite scalar degree of freedom.

7 pages, 5 figures. Material added. To appear in Phys. Lett. B

References in corpus (19)

• Quantum Contributions to Cosmological Correlations II: Can These Corrections Become Large?
• On the one loop corrections to inflation and the CMB anisotropies
• Breakdown of Semiclassical Methods in de Sitter Space
• On Resumming Inflationary Perturbations beyond One-loop
• On the proper treatment of massless fields in Euclidean de Sitter space
• Non-gaussianity from the trispectrum in general single field inflation
• Infrared dynamics in de Sitter space from Schwinger-Dyson equations
• Classical approximation to quantum cosmological correlations
• On "dynamical mass" generation in Euclidean de Sitter space
• Nonperturbative resummation of de Sitter infrared logarithms in the large-N limit
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• Lifetime of a massive particle in a de Sitter universe
• The Zeta-Zeta Correlator Is Time Dependent
• A Maximally Symmetric Vector Propagator
• Condensates and quasiparticles in inflationary cosmology: mass generation and decay widths
• Spontaneous symmetry breaking in inflationary cosmology: on the fate of Goldstone Bosons
• Resummation of infrared logarithms in de Sitter space via Dyson-Schwinger equations: the ladder-rainbow approximation
• Physical momentum representation of scalar field correlators in de Sitter space
• On cosmic hair and "de Sitter breaking" in linearized quantum gravity

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