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RESEARCH PRODUCT
Enhanced local-type inflationary trispectrum from a non-vacuum initial state
Jose Navarro-salasJose Navarro-salasLeonard ParkerIván Agullósubject
High Energy Physics - TheoryAstrofísicaGravitacióCosmology and Nongalactic Astrophysics (astro-ph.CO)Vacuum stateFOS: Physical sciencesAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsCurvatureKinetic energy01 natural sciencesGeneral Relativity and Quantum CosmologyQuantum state0103 physical sciencesSensitivity (control systems)010306 general physicsMathematical physicsPhysicsCosmologia010308 nuclear & particles physicsOrder (ring theory)Astronomy and AstrophysicsAmplitudeHigh Energy Physics - Theory (hep-th)TrispectrumAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We compute the primordial trispectrum for curvature perturbations produced during cosmic inflation in models with standard kinetic terms, when the initial quantum state is not necessarily the vacuum state. The presence of initial perturbations enhances the trispectrum amplitude for configuration in which one of the momenta, say $k_3$, is much smaller than the others, $k_3 \ll k_{1,2,4}$. For those squeezed configurations the trispectrum acquires the so-called local form, with a scale dependent amplitude that can get values of order $ \epsilon ({k_1}/{k_3})^2$. This amplitude can be larger than the prediction of the so-called Maldacena consistency relation by a factor $10^6$, and can reach the sensitivity of forthcoming observations, even for single-field inflationary models.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-12-07 |