Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing
ABSTRACT Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a f...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2019-10, Vol.489 (2), p.1950-1956 |
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creator | Ballardini, Mario Matthewson, William L Maartens, Roy |
description | ABSTRACT
Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multitracer approach. Furthermore we then include cosmic microwave background (CMB) lensing from a CMB Stage 4 experiment in the multitracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB Stage 4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index. |
doi_str_mv | 10.1093/mnras/stz2258 |
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Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multitracer approach. Furthermore we then include cosmic microwave background (CMB) lensing from a CMB Stage 4 experiment in the multitracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB Stage 4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stz2258</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2019-10, Vol.489 (2), p.1950-1956</ispartof><rights>2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-bbf3b1bf35afee7a5e7ad125c63b197fa72297d27fb9916bd2e4d5dc444b6a2e3</citedby><cites>FETCH-LOGICAL-c375t-bbf3b1bf35afee7a5e7ad125c63b197fa72297d27fb9916bd2e4d5dc444b6a2e3</cites><orcidid>0000-0003-4481-3559</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1598,27901,27902</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stz2258$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Ballardini, Mario</creatorcontrib><creatorcontrib>Matthewson, William L</creatorcontrib><creatorcontrib>Maartens, Roy</creatorcontrib><title>Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multitracer approach. Furthermore we then include cosmic microwave background (CMB) lensing from a CMB Stage 4 experiment in the multitracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB Stage 4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.</description><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkD1PwzAQhi0EEqUwsntkMfVHbDcjRFCQimCAObrEThWUOpUvAcKvb0K7M9yddHr06tVDyLXgt4KnarENEXCB3a-UenlCZkIZzWRqzCmZca40W1ohzskF4ifnPFHSzMhb1gbsItShDhu6i_W2ja6GhoY2sBX0iDWEuhtojxPQfbd0Aw38DBT7-OUHpBAczV7uaePDhFySswoa9FfHOycfjw_v2RNbv66es7s1K5XVHSuKShViXBoq7y3ocZyQujTjO7UVWClT66StijQVpnDSJ067MkmSwoD0ak7YIbeMLWL0VT6VhzjkgueTjvxPR37UMfI3B77td_-ge_PRZaA</recordid><startdate>20191021</startdate><enddate>20191021</enddate><creator>Ballardini, Mario</creator><creator>Matthewson, William L</creator><creator>Maartens, Roy</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0003-4481-3559</orcidid></search><sort><creationdate>20191021</creationdate><title>Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing</title><author>Ballardini, Mario ; Matthewson, William L ; Maartens, Roy</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c375t-bbf3b1bf35afee7a5e7ad125c63b197fa72297d27fb9916bd2e4d5dc444b6a2e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ballardini, Mario</creatorcontrib><creatorcontrib>Matthewson, William L</creatorcontrib><creatorcontrib>Maartens, Roy</creatorcontrib><collection>CrossRef</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Ballardini, Mario</au><au>Matthewson, William L</au><au>Maartens, Roy</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2019-10-21</date><risdate>2019</risdate><volume>489</volume><issue>2</issue><spage>1950</spage><epage>1956</epage><pages>1950-1956</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multitracer approach. Furthermore we then include cosmic microwave background (CMB) lensing from a CMB Stage 4 experiment in the multitracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB Stage 4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnras/stz2258</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0003-4481-3559</orcidid><oa>free_for_read</oa></addata></record> |
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title | Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing |
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