Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture
The cold spot is one of the observed CMB anomalies proposed to be produced by various primary and secondary effects. In this work, we study the gravitational lensing of some of the candidates that could produce the cold spot, namely a huge void and a cosmic texture, on the various components of CMB...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2019-12-01
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| Series: | Iranian Journal of Physics Research |
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| Online Access: | http://ijpr.iut.ac.ir/article-1-2817-en.html |
| _version_ | 1818544610469740544 |
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| author | M Farhang S M S Movahed |
| author_facet | M Farhang S M S Movahed |
| author_sort | M Farhang |
| collection | DOAJ |
| description | The cold spot is one of the observed CMB anomalies proposed to be produced by various primary and secondary effects. In this work, we study the gravitational lensing of some of the candidates that could produce the cold spot, namely a huge void and a cosmic texture, on the various components of CMB random field. Our results demonstrated that the signal to noise ratio of gravitational lensing effect on the CMB temperature field is higher than that of on CMB polarization. We found that for a cylindrically symmetric void at z_Void=0.8 with σ=-1.0 a thousand minute observation would detect the gravitational lensing signal while for a cosmic texture at z_Texture=6.0 a longer observation is required. We expect the future high resolution surveys can put strong constraints on the amplitudes of the template of these models. |
| first_indexed | 2024-12-11T22:50:44Z |
| format | Article |
| id | doaj.art-53e8d833de704a87be49c991523d6760 |
| institution | Directory Open Access Journal |
| issn | 1682-6957 2345-3664 |
| language | English |
| last_indexed | 2024-12-11T22:50:44Z |
| publishDate | 2019-12-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Iranian Journal of Physics Research |
| spelling | doaj.art-53e8d833de704a87be49c991523d67602022-12-22T00:47:27ZengIsfahan University of TechnologyIranian Journal of Physics Research1682-69572345-36642019-12-01193611620Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and textureM Farhang0S M S Movahed1 Department of Physics, Shahid Beheshti University, Tehran, Iran Department of Physics, Shahid Beheshti University, Tehran, Iran The cold spot is one of the observed CMB anomalies proposed to be produced by various primary and secondary effects. In this work, we study the gravitational lensing of some of the candidates that could produce the cold spot, namely a huge void and a cosmic texture, on the various components of CMB random field. Our results demonstrated that the signal to noise ratio of gravitational lensing effect on the CMB temperature field is higher than that of on CMB polarization. We found that for a cylindrically symmetric void at z_Void=0.8 with σ=-1.0 a thousand minute observation would detect the gravitational lensing signal while for a cosmic texture at z_Texture=6.0 a longer observation is required. We expect the future high resolution surveys can put strong constraints on the amplitudes of the template of these models.http://ijpr.iut.ac.ir/article-1-2817-en.htmlcmb stochastic fieldgravitational lensinglikelihood analysis |
| spellingShingle | M Farhang S M S Movahed Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture Iranian Journal of Physics Research cmb stochastic field gravitational lensing likelihood analysis |
| title | Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture |
| title_full | Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture |
| title_fullStr | Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture |
| title_full_unstemmed | Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture |
| title_short | Polarization of the CMB cold spot by the gravitational lensing of a cosmic void and texture |
| title_sort | polarization of the cmb cold spot by the gravitational lensing of a cosmic void and texture |
| topic | cmb stochastic field gravitational lensing likelihood analysis |
| url | http://ijpr.iut.ac.ir/article-1-2817-en.html |
| work_keys_str_mv | AT mfarhang polarizationofthecmbcoldspotbythegravitationallensingofacosmicvoidandtexture AT smsmovahed polarizationofthecmbcoldspotbythegravitationallensingofacosmicvoidandtexture |