Cosmological Collider Physics

By N. Arkani-Hamed, J. Maldacena. 2015

391 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ca3ebc93ac4a1343546a5ad320323275bd4fcb70

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. E. Pajer
2. Xingang Chen
3. D. Baumann
4. Yi Wang
5. A. Banday
6. H. Eriksen
7. F. Hansen
8. P. Lilje

In Nuclear and High Energy Physics

1. Xingang Chen
2. E. Pajer
3. D. Baumann
4. Yi Wang
5. Hayden Lee
6. A. Joyce
7. G. L. Pimentel
8. C. D. Pueyo

Citations in the corpus

• The Cosmological Bootstrap: Spinning correlators from symmetries and factorization (2020, background): “(38)Recall that, in this paper, F̂ denotes a wavefunction coefficient, while, in [22, 45], we computed boundary correlators.”
• Schwinger-Keldysh diagrammatics for primordial perturbations (2017, background): “This agrees with the observation in [27,31], where a simplified model is studied(4).”
• Probing ultralight bosons with binary black holes (2018, background): “A similar analogy, between collider physics and the imprints of massive particles in cosmological correlation functions, was drawn in [71].”
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, background): “Measuring primordial NG can allow us to pin down masses and spins of the particle content present during inflation, making inflation a powerful cosmological collider (Chen 2010b; Chen & Wang 2010; Noumi et al. 2013; Arkani-Hamed & Maldacena 2015; Baumann et al. 2018; Arkani-Hamed et al. 2018).”
• The cosmological bootstrap: inflationary correlators from symmetries and singularities (2018, neutral): “28 However, if the breaking of the conformal symmetry is weak, then inflationary three-point functions can also be obtained by taking one of the legs of the de Sitter four-point functions to have a soft momentum and a small mass [58, 70, 102] (see Fig.”
• The cosmological bootstrap: weight-shifting operators and scalar seeds (2019, background): “A large class of contact solutions is extremely simple, and can be written as [12] Ĉn = ∆ n uĈ0 , where Ĉ0 = uv u+ v .”
• Building a boostless bootstrap for the bispectrum (2020, background): “In particular, building on [20], this work has emphasized the role of unitarity, locality and the choice of vacuum in constraining the resulting correlators.”
• Non-Gaussianity as a particle detector (2016, methodology): “We will drop some of the restrictions of the analysis of AHM in our analysis.”
• The tune of love and the nature(ness) of spacetime (2016, background): “universe resembles a (fixed-energy) cosmological collider [23] where observations are bounded by the Hubble scale during inflation.”