Understanding large scale CMB anomalies with the generalized nonminimal derivative coupling during inflation
In: Physical Review D, Jg. 107 (2023-05-12)
Online
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Zugriff:
We study the observational implications of a class of inflationary models wherein the inflaton is coupled to the Einstein tensor through a generalized non-minimal derivative coupling (GNMDC). In particular, we explore whether these models can generate suitable features in the primordial spectrum of curvature perturbations as a possible explanation for the large-scale anomalies associated with the angular power spectrum of CMB temperature anisotropies. We derive model-independent constraints on the GNMDC function for such a scenario, considering both the scalar and tensor perturbations. We modify CosmoMC to accommodate our GNMDC framework and investigate different classes of inflationary models using a fully consistent numerical approach. We find that the hilltop-quartic model with a specific choice of the GNMDC function provides a considerable improvement over the best-fit reference $\Lambda$CDM model with a nearly scale-invariant power spectrum. While the large-scale structure observations should be able to provide independent constraints, future CMB experiments, such as CMB-S4 and CMB-Bharat, are expected to constrain further the parameter space of such beyond canonical single-field inflationary models.
Comment: v1: 34 pages, 7 figures, 4 tables; v2: 26 pages, 8 figures, 4 tables, published in Phys. Rev. D
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Understanding large scale CMB anomalies with the generalized nonminimal derivative coupling during inflation
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Autor/in / Beteiligte Person: | Tiwari, Yashi ; Bhaumik, Nilanjandev ; Rajeev Kumar Jain |
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Zeitschrift: | Physical Review D, Jg. 107 (2023-05-12) |
Veröffentlichung: | American Physical Society (APS), 2023 |
Medientyp: | unknown |
ISSN: | 2470-0029 (print) ; 2470-0010 (print) |
DOI: | 10.1103/physrevd.107.103513 |
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