2020/05/04 by Ivan Agullo, Dimitrios Kranas, V. Sreenath
Physics and Astronomy · #Amplitude #COSMIC cancer database #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Electrical and Electromagnetic Research #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Phenomenological model #Spectral density #Universe #astro-ph.CO #gr-qc
paper · pdf · doi:10.1007/s10714-020-02778-9
6 pages, 4 figures
arxiv created 2020/05/04 · openalex created_date 2020/05/13 · openalex publication_date 2021/02/01 · arxiv updated 2021/02/17 · openalex updated_date 2026/08/05
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 do not restrict to any specific theory, but rather derive features common to a family bouncing models.