CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5
we continue our study of the CMB temperature polarization (TE) cross-correlation as a source of information about primordial gravitational waves (PGWs). In a previous paper, we considered two methods for detecting PGWs using the TE cross-correlation. The first method is the zero multipole method, wh...
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| Format: | Article |
| Language: | English |
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Wiley
2009-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2009/309024 |
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| author | N. J. Miller B. G. Keating A. G. Polnarev |
| author_facet | N. J. Miller B. G. Keating A. G. Polnarev |
| author_sort | N. J. Miller |
| collection | DOAJ |
| description | we continue our study of the CMB temperature polarization (TE) cross-correlation as a source of
information about primordial gravitational waves (PGWs). In a previous paper, we considered two
methods for detecting PGWs using the TE cross-correlation. The first method is the zero multipole
method, where we find the multipole, ℓ0, where the TE cross-correlation power spectrum, CℓTE, first changes sign. The second method Wiener filters the CMB TE data to remove the density
perturbation contribution to the TE power spectrum. We then use statistical tests to determine
if there is a detection of negative residual TE correlation and hence a detection of primordial
gravitational waves, the only source of negative TE correlation at these superhorizon scales. In this
paper, we will apply these tests to the WMAP 5-year data. We find that the TE power spectrum
consistent with r < 2.0 at 95% confidence with no additional assumptions about the PGWs. If we
assume that the PGWs are generated by inflation, then we get r < 1.0 at 95% confidence. |
| format | Article |
| id | doaj-art-1a2770d908454b2aad20e908bf147860 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-1a2770d908454b2aad20e908bf1478602025-02-03T00:59:11ZengWileyAdvances in Astronomy1687-79691687-79772009-01-01200910.1155/2009/309024309024CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5N. J. Miller0B. G. Keating1A. G. Polnarev2Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USACenter for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USAAstronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UKwe continue our study of the CMB temperature polarization (TE) cross-correlation as a source of information about primordial gravitational waves (PGWs). In a previous paper, we considered two methods for detecting PGWs using the TE cross-correlation. The first method is the zero multipole method, where we find the multipole, ℓ0, where the TE cross-correlation power spectrum, CℓTE, first changes sign. The second method Wiener filters the CMB TE data to remove the density perturbation contribution to the TE power spectrum. We then use statistical tests to determine if there is a detection of negative residual TE correlation and hence a detection of primordial gravitational waves, the only source of negative TE correlation at these superhorizon scales. In this paper, we will apply these tests to the WMAP 5-year data. We find that the TE power spectrum consistent with r < 2.0 at 95% confidence with no additional assumptions about the PGWs. If we assume that the PGWs are generated by inflation, then we get r < 1.0 at 95% confidence.http://dx.doi.org/10.1155/2009/309024 |
| spellingShingle | N. J. Miller B. G. Keating A. G. Polnarev CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 Advances in Astronomy |
| title | CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 |
| title_full | CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 |
| title_fullStr | CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 |
| title_full_unstemmed | CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 |
| title_short | CMB Temperature Polarization Correlation and Primordial Gravitational Waves: WMAP5 |
| title_sort | cmb temperature polarization correlation and primordial gravitational waves wmap5 |
| url | http://dx.doi.org/10.1155/2009/309024 |
| work_keys_str_mv | AT njmiller cmbtemperaturepolarizationcorrelationandprimordialgravitationalwaveswmap5 AT bgkeating cmbtemperaturepolarizationcorrelationandprimordialgravitationalwaveswmap5 AT agpolnarev cmbtemperaturepolarizationcorrelationandprimordialgravitationalwaveswmap5 |