Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments
The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new, very precise measurements of the cosmic microwave background (CMB) anisotropy damping tail. The values of the cosmological parameters inferred from these measurements, while broadly consistent with t...
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ftunivferrarair:oai:iris.unife.it:11392/2279661 2024-02-11T10:08:40+01:00 Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments E. D. Valentino S. Galli A. Melchiorri L. Pagano N. Said LATTANZI, Massimiliano NATOLI, Paolo Valentino, E. D. Galli, S. Lattanzi, Massimiliano Melchiorri, A. Natoli, Paolo Pagano, L. Said, N. 2013 STAMPA http://hdl.handle.net/11392/2279661 https://doi.org/10.1103/PhysRevD.88.023501 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000321125500001 volume:88 firstpage:023501-1 lastpage:023501-7 journal:PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY http://hdl.handle.net/11392/2279661 doi:10.1103/PhysRevD.88.023501 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84881301645 info:eu-repo/semantics/article 2013 ftunivferrarair https://doi.org/10.1103/PhysRevD.88.023501 2024-01-24T17:43:43Z The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new, very precise measurements of the cosmic microwave background (CMB) anisotropy damping tail. The values of the cosmological parameters inferred from these measurements, while broadly consistent with the expectations of the standard cosmological model, are providing interesting possible indications for new physics that are definitely worthy of investigation. The ACT results, while compatible with the standard expectation of three-neutrino families, indicate a level of CMB lensing, parametrized by the lensing amplitude parameter A(L), that is about 70% higher than expected. If not caused by an experimental systematic, an anomalous lensing amplitude could be produced by modifications of general relativity or coupled dark energy. Vice versa, the SPT experiment, while compatible with a standard level of CMB lensing, prefers an excess of dark radiation, parametrized by the effective number of relativistic degrees of freedom N-eff. Here we perform a new analysis of these experiments allowing simultaneous variations in both of these nonstandard parameters. We also combine these experiments, for the first time in the literature, with the recent WMAP9 data, one at a time. Including the Hubble Space Telescope prior on the Hubble constant and information from baryon acoustic oscillations surveys provides the following constraints from ACT: N-eff = 3.54 +/- 0.41, A(L) = 1.64 +/- 0.32 at 68% C. L., while for SPT we have N-eff = 3.78 +/- 0.33, A(L) = 0.79 +/- 0.11 at 68% C. L. In particular, the A(L) estimates from the two experiments, even when a variation in N-eff is allowed, are in tension at more than 95% C.L. Article in Journal/Newspaper South pole Università degli Studi di Ferrara: CINECA IRIS Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) South Pole Physical Review D 88 2 |
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Università degli Studi di Ferrara: CINECA IRIS |
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ftunivferrarair |
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English |
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The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new, very precise measurements of the cosmic microwave background (CMB) anisotropy damping tail. The values of the cosmological parameters inferred from these measurements, while broadly consistent with the expectations of the standard cosmological model, are providing interesting possible indications for new physics that are definitely worthy of investigation. The ACT results, while compatible with the standard expectation of three-neutrino families, indicate a level of CMB lensing, parametrized by the lensing amplitude parameter A(L), that is about 70% higher than expected. If not caused by an experimental systematic, an anomalous lensing amplitude could be produced by modifications of general relativity or coupled dark energy. Vice versa, the SPT experiment, while compatible with a standard level of CMB lensing, prefers an excess of dark radiation, parametrized by the effective number of relativistic degrees of freedom N-eff. Here we perform a new analysis of these experiments allowing simultaneous variations in both of these nonstandard parameters. We also combine these experiments, for the first time in the literature, with the recent WMAP9 data, one at a time. Including the Hubble Space Telescope prior on the Hubble constant and information from baryon acoustic oscillations surveys provides the following constraints from ACT: N-eff = 3.54 +/- 0.41, A(L) = 1.64 +/- 0.32 at 68% C. L., while for SPT we have N-eff = 3.78 +/- 0.33, A(L) = 0.79 +/- 0.11 at 68% C. L. In particular, the A(L) estimates from the two experiments, even when a variation in N-eff is allowed, are in tension at more than 95% C.L. |
author2 |
Valentino, E. D. Galli, S. Lattanzi, Massimiliano Melchiorri, A. Natoli, Paolo Pagano, L. Said, N. |
format |
Article in Journal/Newspaper |
author |
E. D. Valentino S. Galli A. Melchiorri L. Pagano N. Said LATTANZI, Massimiliano NATOLI, Paolo |
spellingShingle |
E. D. Valentino S. Galli A. Melchiorri L. Pagano N. Said LATTANZI, Massimiliano NATOLI, Paolo Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
author_facet |
E. D. Valentino S. Galli A. Melchiorri L. Pagano N. Said LATTANZI, Massimiliano NATOLI, Paolo |
author_sort |
E. D. Valentino |
title |
Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
title_short |
Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
title_full |
Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
title_fullStr |
Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
title_full_unstemmed |
Tickling the CMB damping tail: Scrutinizing the tension between the Atacama Cosmology Telescope and South Pole Telescope experiments |
title_sort |
tickling the cmb damping tail: scrutinizing the tension between the atacama cosmology telescope and south pole telescope experiments |
publishDate |
2013 |
url |
http://hdl.handle.net/11392/2279661 https://doi.org/10.1103/PhysRevD.88.023501 |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
Hubble South Pole |
geographic_facet |
Hubble South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000321125500001 volume:88 firstpage:023501-1 lastpage:023501-7 journal:PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY http://hdl.handle.net/11392/2279661 doi:10.1103/PhysRevD.88.023501 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84881301645 |
op_doi |
https://doi.org/10.1103/PhysRevD.88.023501 |
container_title |
Physical Review D |
container_volume |
88 |
container_issue |
2 |
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1790608192403668992 |