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Anomalies in the CMB from a cosmic bounce

General Relativity and Gravitation volume 53, Article number: 17 (2021) Cite this article

Abstract

We explore a model of the early universe in which the inflationary epoch is preceded by a cosmic bounce, and argue that this scenario provides a common origin to several of the anomalous features that have been observed at large angular scales in the cosmic microwave background (CMB). More concretely, we show that a power suppression, a dipolar asymmetry, and a preference for odd-parity correlations, with amplitude and scale dependence in consonance with observations, are expected from this scenario. The model also alleviates the tension in the lensing amplitude. These signals originate from the indirect effect that non-Gaussian correlations between CMB modes and super-horizon wavelengths induce in the power spectrum. We follow a phenomenological approach, restricted to a family of bouncing models, and complement our analysis by pointing out to well established theories where our ideas are materialized.

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Acknowledgements

We specially thank Boris Bolliet for several discussions, inputs, and initial collaboration on this project. We have benefited from discussions with A. Ashtekar, B. Gupt, J. Olmedo, J. Pullin, and P. Singh. We thank B. Gupt for assistance with Planck data. This work is supported by the NSF CAREER Grant PHY-1552603, and from the Hearne Institute for Theoretical Physics. V.S. was supported by Louisiana State University and Inter-University Centre for Astronomy and Astrophysics during earlier stages of this work. This research was conducted with high performance computing resources provided by Louisiana State University (http://www.hpc.lsu.edu), and based on observations obtained with Planck (http://www.esa.int/Planck), an ESA science mission with instruments and contributions directly funded by ESA Member States, NASA, and Canada.

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Authors and Affiliations

  1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA, 70803, USA

    Ivan Agullo & Dimitrios Kranas

  2. Department of Physics, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India

    V. Sreenath

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  1. Ivan Agullo
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  2. Dimitrios Kranas
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  3. V. Sreenath
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Correspondence to Ivan Agullo.

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Agullo, I., Kranas, D. & Sreenath, V. Anomalies in the CMB from a cosmic bounce. Gen Relativ Gravit 53, 17 (2021). https://doi.org/10.1007/s10714-020-02778-9

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