Wuhyun Sohn, Dong-Gang Wang, James R. Fergusson and E.P.S. Shellard
{"title":"从普朗克 CMB 数据中寻找宇宙学对撞机","authors":"Wuhyun Sohn, Dong-Gang Wang, James R. Fergusson and E.P.S. Shellard","doi":"10.1088/1475-7516/2024/09/016","DOIUrl":null,"url":null,"abstract":"In this paper, we present the first comprehensive CMB data analysis of cosmological collider physics. New heavy particles during inflation can leave imprints in the primordial correlators which are observable in today's cosmological surveys. This remarkable detection channel provides an unsurpassed opportunity to probe new physics at extremely high energies. Here we initiate the search for these relic signals in the cosmic microwave background (CMB) data from the Planck legacy release. On the theory side, guided by recent progress from the cosmological bootstrap, we first propose a family of analytic bispectrum templates that incorporate the distinctive signatures of cosmological collider physics. Our consideration includes the oscillatory signals in the squeezed limit, the angular dependence from spinning fields, and several new shapes from nontrivial sound speed effects. On the observational side, we apply the recently developed pipeline, CMB Bispectrum Estimator (CMB-BEST), to efficiently analyze the three-point statistics and search directly for these new templates in the Planck 2018 temperature and polarization data. We report stringent CMB constraints on these new templates. Furthermore, we perform parameter scans to search for the best-fit values with maximum significance. For a benchmark example of collider templates, we find fNL = -91 ± 40 at the 68% confidence level. After accounting for the look-elsewhere effect, the biggest adjusted significance we get is 1.8σ. In general, we find no significant evidence of cosmological collider signals in the Planck data. However, our innovative analysis, together with the recent work [107] using the BOSS data, sets the stage for probing cosmological collider and demonstrates the potential for discovering new heavy particles during inflation in forthcoming cosmological surveys.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Searching for cosmological collider in the Planck CMB data\",\"authors\":\"Wuhyun Sohn, Dong-Gang Wang, James R. Fergusson and E.P.S. Shellard\",\"doi\":\"10.1088/1475-7516/2024/09/016\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this paper, we present the first comprehensive CMB data analysis of cosmological collider physics. New heavy particles during inflation can leave imprints in the primordial correlators which are observable in today's cosmological surveys. This remarkable detection channel provides an unsurpassed opportunity to probe new physics at extremely high energies. Here we initiate the search for these relic signals in the cosmic microwave background (CMB) data from the Planck legacy release. On the theory side, guided by recent progress from the cosmological bootstrap, we first propose a family of analytic bispectrum templates that incorporate the distinctive signatures of cosmological collider physics. Our consideration includes the oscillatory signals in the squeezed limit, the angular dependence from spinning fields, and several new shapes from nontrivial sound speed effects. On the observational side, we apply the recently developed pipeline, CMB Bispectrum Estimator (CMB-BEST), to efficiently analyze the three-point statistics and search directly for these new templates in the Planck 2018 temperature and polarization data. We report stringent CMB constraints on these new templates. Furthermore, we perform parameter scans to search for the best-fit values with maximum significance. For a benchmark example of collider templates, we find fNL = -91 ± 40 at the 68% confidence level. After accounting for the look-elsewhere effect, the biggest adjusted significance we get is 1.8σ. In general, we find no significant evidence of cosmological collider signals in the Planck data. 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Searching for cosmological collider in the Planck CMB data
In this paper, we present the first comprehensive CMB data analysis of cosmological collider physics. New heavy particles during inflation can leave imprints in the primordial correlators which are observable in today's cosmological surveys. This remarkable detection channel provides an unsurpassed opportunity to probe new physics at extremely high energies. Here we initiate the search for these relic signals in the cosmic microwave background (CMB) data from the Planck legacy release. On the theory side, guided by recent progress from the cosmological bootstrap, we first propose a family of analytic bispectrum templates that incorporate the distinctive signatures of cosmological collider physics. Our consideration includes the oscillatory signals in the squeezed limit, the angular dependence from spinning fields, and several new shapes from nontrivial sound speed effects. On the observational side, we apply the recently developed pipeline, CMB Bispectrum Estimator (CMB-BEST), to efficiently analyze the three-point statistics and search directly for these new templates in the Planck 2018 temperature and polarization data. We report stringent CMB constraints on these new templates. Furthermore, we perform parameter scans to search for the best-fit values with maximum significance. For a benchmark example of collider templates, we find fNL = -91 ± 40 at the 68% confidence level. After accounting for the look-elsewhere effect, the biggest adjusted significance we get is 1.8σ. In general, we find no significant evidence of cosmological collider signals in the Planck data. However, our innovative analysis, together with the recent work [107] using the BOSS data, sets the stage for probing cosmological collider and demonstrates the potential for discovering new heavy particles during inflation in forthcoming cosmological surveys.
期刊介绍:
Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.