Is the Harrison-Zel’dovich spectrum coming back? ACT preference for<i>ns</i>∼ 1 and its discordance with Planck-Reference-Cited by-同舟云学术

Is the Harrison-Zel’dovich spectrum coming back? ACT preference forns∼ 1 and its discordance with Planck

Published:2023-03-09 Issue:2 Volume:521 Page:2911-2918
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Giarè William¹²³^ORCID,Renzi Fabrizio⁴^ORCID,Mena Olga⁵,Di Valentino Eleonora³^ORCID,Melchiorri Alessandro²⁶

Affiliation:

1. Galileo Galileo Institute for theoretical physics , Centro Nazionale INFN di studi avanzati, Largo Enrico Fermi 2, Firenze I-50125, Italy

2. INFN Sezione di Roma , P.le A. Moro 2, Roma I-00185, Italy

3. School of Mathematics and Statistics, University of Sheffield , Hounsfield Road, Sheffield S3 7RH, United Kingdom

4. Lorentz Institute for Theoretical Physics, Leiden University , PO Box 9506, Leiden NL-2300 RA, The Netherlands

5. IFIC, Universidad de Valencia-CSIC , Valencia E-46071, Spain

6. Physics Department, Università di Roma ‘La Sapienza’ , Ple Aldo Moro 2, Rome I-00185, Italy

Abstract

ABSTRACTThe Data Release 4 of the Atacama Cosmology Telescope (ACT) shows an agreement with an Harrison-Zel’dovich primordial spectrum (ns = 1.009 ± 0.015), introducing a tension with a significance of 99.3 per cent Confidence Level (CL) with the results from the Planck satellite. The discrepancy on the value of the scalar spectral index is neither alleviated with the addition of large scale structure information nor with the low multipole polarization data. We discuss possible avenues to alleviate the tension relying on either neglecting polarization measurements from ACT or in extending different sectors of the theory.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad724/49483051/stad724.pdf

Reference64 articles.

1. Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing

2. Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and weak lensing

3. Cosmology intertwined: A review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies

4. Planck2018 results

5. Planck 2018 results

Cited by 24 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. Scaling characteristics of hilltop and hilltop-squared inflation;Physical Review D;2024-07-09

2. Testing scale-invariant inflation against cosmological data;Journal of Cosmology and Astroparticle Physics;2024-07-01

3. Inflation, the Hubble tension, and early dark energy: An alternative overview;Physical Review D;2024-06-27

4. Lower tensor-to-scalar ratio as possible signature of modified gravity;Physical Review D;2024-06-10

5. Gravitational waves in a cyclic Universe: resilience through cycles and vacuum state;Journal of Cosmology and Astroparticle Physics;2024-06-01