Precise calibration of the one-loop bispectrum in the effective field theory of large scale structure
Theodore Steele, Tobias Baldauf
Abstract
The large-scale structure (LSS) provides a three-dimensional cosmological probe containing significantly more information than the CMB, but its small-scale non-linearities render standard perturbation theory unreliable beyond tree-level. The authors study the bispectrum of the LSS, an important cosmological observable for non-Gaussianity, in the effective field theory approach up to 1-loop order, while taking the full $\mathrm{\ensuremath{\Lambda}}$CDM time-dependence into account, and show that this is essential for the next loop-level.
Topics & Concepts
BispectrumPhysicsEffective field theoryTrispectrumPerturbation theory (quantum mechanics)Cosmological perturbation theorySpectral densityTheoretical physicsStatistical physicsNon-GaussianityMathematical physicsParticle physicsQuantum mechanicsInflation (cosmology)Cosmic microwave backgroundMathematicsStatisticsAnisotropyGalaxies: Formation, Evolution, PhenomenaAstronomy and Astrophysical ResearchStellar, planetary, and galactic studies