Cosmological Collider Physics

Abstract

We study the imprint of new particles on the primordial cosmological fluctuations. New particles with masses comparable to the Hubble scale produce a distinctive signature on the non-gaussianities. This feature arises in the squeezed limit of the correlation functions of primordial fluctuations. It consists of particular power law, or oscillatory, behavior that contains information about the masses of new particles. There is an angular dependence that gives information about the spin. We also have a relative phase that crucially depends on the quantum mechanical nature of the fluctuations and can be viewed as arising from the interference between two processes. While some of these features were noted before in the context of specific inflationary scenarios, here we give a general description emphasizing the role of symmetries in determining the final result.

49+12 pages. 13 figures

References in corpus (5)

• Primordial Non-Gaussianities from Inflation Models
• Enhanced Non-Gaussianity from Excited Initial States
• Non-Gaussianity in the modulated reheating scenario
• The IR stability of de Sitter: Loop corrections to scalar propagators
• No-Go Theorems for Unitary and Interacting Partially Massless Spin-Two Fields

Cited by in corpus (15)

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• From Planck data to Planck era: Observational tests of Holographic Cosmology
• Multitracing Anisotropic Non-Gaussianity with Galaxy Shapes
• Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
• Scale-Dependent Galaxy Bias from Massive Particles with Spin during Inflation
• On the Effective Field Theory for Quasi-Single Field Inflation
• Lectures on Inflation
• Inflation from Supergravity with Gauged R-symmetry in de Sitter Vacuum
• A Direct Probe of the Evolutionary History of the Primordial Universe
• Large gauge transformation, Soft theorem, and Infrared divergence in inflationary spacetime
• Holographic non-Gaussianities in general single-field inflation
• Now, and the Flow of Time
• Tensor Adiabatic Modes and Consistency Relations with Primordial Axion-Gauge Fields