التفاصيل البيبلوغرافية
| العنوان: |
Analytic Calculation of Covariance between Cosmological Parameters from Correlated Data Sets, with an Application to SPTpol. |
| المؤلفون: |
Kable JA; Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA., Addison GE; Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA., Bennett CL; Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA. |
| المصدر: |
The Astrophysical journal [Astrophys J] 2020 Jan 01; Vol. 888 (1). Date of Electronic Publication: 2019 Dec 31. |
| نوع المنشور: |
Journal Article |
| اللغة: |
English |
| بيانات الدورية: |
Publisher: Published by the University of Chicago Press for the American Astronomical Society Country of Publication: United States NLM ID: 9890633 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0004-637X (Print) Linking ISSN: 0004637X NLM ISO Abbreviation: Astrophys J Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: |
Original Publication: [Chicago] Published by the University of Chicago Press for the American Astronomical Society. |
| مستخلص: |
Consistency checks of cosmological data sets are an important tool because they may suggest systematic errors or the type of modifications to ΛCDM necessary to resolve current tensions. In this work, we derive an analytic method for calculating the level of correlations between model parameters from two correlated cosmological data sets, which complements more computationally expensive simulations. This method is an extension of the Fisher analysis that assumes a Gaussian likelihood and a known data covariance matrix. We apply this method to the South Pole Telescope Polarimeter (SPTpol) temperature and polarization cosmic microwave background (CMB) spectra (TE and EE). We find weak correlations between ΛCDM parameters with a 9% correlation between the TE-only and EE-only constraints on H 0 and a 25% and 32% correlation for log( A s ) and n s respectively. The TE-EE parameter differences are consistent with zero, with a probability to exceed of 0.53. Using simulations we show that this test is independent of the consistency of the SPTpol TE and EE band powers with the best-fit ΛCDM model spectra. Despite the negative correlations between the TE and EE power spectra, the correlations between TE-only and EE-only ΛCDM parameters are positive. Ignoring correlations in the TT-TE and TE-EE comparisons biases the χ 2 low, artificially making parameters look more consistent. Therefore, we conclude that these correlations need to be accounted for when performing internal consistency checks of the TT versus TE versus EE power spectra for future CMB analyses. |
| References: |
Phys Rev Lett. 2019 Jun 7;122(22):221301. (PMID: 31283280) |
| معلومات مُعتمدة: |
80NSSC19K0526 United States ImNASA Intramural NASA; NNX16AF28G United States NASA NASA; NNX17AF34G United States NASA NASA |
| فهرسة مساهمة: |
Keywords: Cosmic microwave background radiation (322); Cosmological parameters (339); Cosmology (343); Observational cosmology (1146) |
| تواريخ الأحداث: |
Date Created: 20200408 Latest Revision: 20210110 |
| رمز التحديث: |
20221213 |
| مُعرف محوري في PubMed: |
PMC7121275 |
| DOI: |
10.3847/1538-4357/ab54cc |
| PMID: |
32255817 |
| قاعدة البيانات: |
MEDLINE |
