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Title: Low variance at large scales of WMAP 9 year data

Abstract

We use an optimal estimator to study the variance of the WMAP 9 CMB field at low resolution, in both temperature and polarization. Employing realistic Monte Carlo simulation, we find statistically significant deviations from the ΛCDM model in several sky cuts for the temperature field. For the considered masks in this analysis, which cover at least the 54% of the sky, the WMAP 9 CMB sky and ΛCDM are incompatible at ≥ 99.94% C.L. at large angles ( > 5°). We find instead no anomaly in polarization. As a byproduct of our analysis, we present new, optimal estimates of the WMAP 9 CMB angular power spectra from the WMAP 9 year data at low resolution.

Authors:
; ; ;  [1];  [2];  [3]
  1. INAF-IASF Bologna, Via P. Gobetti 101, I-40129, Bologna (Italy)
  2. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, via Saragat 1, I-44100 Ferrara (Italy)
  3. SISSA - Scuola Internazionale Superiore di Studi Avanzati, via Bonomea 265, I-34136 Trieste (Italy)
Publication Date:
OSTI Identifier:
22282688
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2013; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; ENERGY SPECTRA; MONTE CARLO METHOD; NONLUMINOUS MATTER; POLARIZATION

Citation Formats

Gruppuso, A., Finelli, F., Rosa, A. De, Mandolesi, N., Natoli, P., Paci, F., and Molinari, D., E-mail: gruppuso@iasfbo.inaf.it, E-mail: natoli@fe.infn.it, E-mail: fpaci@sissa.it, E-mail: finelli@iasfbo.inaf.it, E-mail: molinari@iasfbo.inaf.it, E-mail: derosa@iasfbo.inaf.it, E-mail: mandolesi@iasfbo.inaf.it. Low variance at large scales of WMAP 9 year data. United States: N. p., 2013. Web. doi:10.1088/1475-7516/2013/07/047.
Gruppuso, A., Finelli, F., Rosa, A. De, Mandolesi, N., Natoli, P., Paci, F., & Molinari, D., E-mail: gruppuso@iasfbo.inaf.it, E-mail: natoli@fe.infn.it, E-mail: fpaci@sissa.it, E-mail: finelli@iasfbo.inaf.it, E-mail: molinari@iasfbo.inaf.it, E-mail: derosa@iasfbo.inaf.it, E-mail: mandolesi@iasfbo.inaf.it. Low variance at large scales of WMAP 9 year data. United States. https://doi.org/10.1088/1475-7516/2013/07/047
Gruppuso, A., Finelli, F., Rosa, A. De, Mandolesi, N., Natoli, P., Paci, F., and Molinari, D., E-mail: gruppuso@iasfbo.inaf.it, E-mail: natoli@fe.infn.it, E-mail: fpaci@sissa.it, E-mail: finelli@iasfbo.inaf.it, E-mail: molinari@iasfbo.inaf.it, E-mail: derosa@iasfbo.inaf.it, E-mail: mandolesi@iasfbo.inaf.it. 2013. "Low variance at large scales of WMAP 9 year data". United States. https://doi.org/10.1088/1475-7516/2013/07/047.
@article{osti_22282688,
title = {Low variance at large scales of WMAP 9 year data},
author = {Gruppuso, A. and Finelli, F. and Rosa, A. De and Mandolesi, N. and Natoli, P. and Paci, F. and Molinari, D., E-mail: gruppuso@iasfbo.inaf.it, E-mail: natoli@fe.infn.it, E-mail: fpaci@sissa.it, E-mail: finelli@iasfbo.inaf.it, E-mail: molinari@iasfbo.inaf.it, E-mail: derosa@iasfbo.inaf.it, E-mail: mandolesi@iasfbo.inaf.it},
abstractNote = {We use an optimal estimator to study the variance of the WMAP 9 CMB field at low resolution, in both temperature and polarization. Employing realistic Monte Carlo simulation, we find statistically significant deviations from the ΛCDM model in several sky cuts for the temperature field. For the considered masks in this analysis, which cover at least the 54% of the sky, the WMAP 9 CMB sky and ΛCDM are incompatible at ≥ 99.94% C.L. at large angles ( > 5°). We find instead no anomaly in polarization. As a byproduct of our analysis, we present new, optimal estimates of the WMAP 9 CMB angular power spectra from the WMAP 9 year data at low resolution.},
doi = {10.1088/1475-7516/2013/07/047},
url = {https://www.osti.gov/biblio/22282688}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 07,
volume = 2013,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2013},
month = {Mon Jul 01 00:00:00 EDT 2013}
}