Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way
Abstract In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parame...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2018-03, Vol.474 (3), p.3516-3522 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Wang, Yu-Yang Wang, F Y |
| description | Abstract
In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parameters and cosmological parameters simultaneously employing Markov chain Monte Carlo method. Therefore, the results on the amount of deviation from isotropy of the dark energy equation of state (δ), and the level of anisotropy of the large-scale geometry (Σ0) at present, are totally model-independent. The constraints on the skewness and cosmic shear are −0.101 |
| doi_str_mv | 10.1093/mnras/stx2982 |
| format | Article |
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In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parameters and cosmological parameters simultaneously employing Markov chain Monte Carlo method. Therefore, the results on the amount of deviation from isotropy of the dark energy equation of state (δ), and the level of anisotropy of the large-scale geometry (Σ0) at present, are totally model-independent. The constraints on the skewness and cosmic shear are −0.101 < δ < 0.071 and −0.007 < Σ0 < 0.008. This result is consistent with a standard isotropic universe (δ = Σ0 = 0). However, a moderate level of anisotropy in the geometry of the Universe and the equation of state of dark energy, is allowed. Besides, there is no obvious evidence for a preferred direction of anisotropic axis in this model.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stx2982</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Anisotropy ; Astronomical models ; Computer simulation ; Constraint modelling ; Cosmology ; Dark energy ; Energy equation ; Equations of state ; Isotropy ; Markov analysis ; Markov chains ; Monte Carlo simulation ; Parameters ; Supernovae ; Universe</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2018-03, Vol.474 (3), p.3516-3522</ispartof><rights>2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2018</rights><rights>2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c298t-6db92d6094e0d0d0fd41b18da7785c9896ca8cb95001dbffc67112c477dd41b63</citedby><cites>FETCH-LOGICAL-c298t-6db92d6094e0d0d0fd41b18da7785c9896ca8cb95001dbffc67112c477dd41b63</cites><orcidid>0000-0003-4157-7714</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Wang, Yu-Yang</creatorcontrib><creatorcontrib>Wang, F Y</creatorcontrib><title>Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way</title><title>Monthly notices of the Royal Astronomical Society</title><description>Abstract
In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parameters and cosmological parameters simultaneously employing Markov chain Monte Carlo method. Therefore, the results on the amount of deviation from isotropy of the dark energy equation of state (δ), and the level of anisotropy of the large-scale geometry (Σ0) at present, are totally model-independent. The constraints on the skewness and cosmic shear are −0.101 < δ < 0.071 and −0.007 < Σ0 < 0.008. This result is consistent with a standard isotropic universe (δ = Σ0 = 0). However, a moderate level of anisotropy in the geometry of the Universe and the equation of state of dark energy, is allowed. Besides, there is no obvious evidence for a preferred direction of anisotropic axis in this model.</description><subject>Anisotropy</subject><subject>Astronomical models</subject><subject>Computer simulation</subject><subject>Constraint modelling</subject><subject>Cosmology</subject><subject>Dark energy</subject><subject>Energy equation</subject><subject>Equations of state</subject><subject>Isotropy</subject><subject>Markov analysis</subject><subject>Markov chains</subject><subject>Monte Carlo simulation</subject><subject>Parameters</subject><subject>Supernovae</subject><subject>Universe</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LAzEQhoMoWKtH7wEvXmKT7G42OUrRWih4afEYsknWbmmTNdlt3X9v-nGXgRkGnvl4XwAeCX4hWGSTnQsqTmL3SwWnV2BEMlYgKhi7BiOMswLxkpBbcBfjBmOcZ5SNwNfSxq5x37BbW9hE3wXfDtDXp37lmr0N0cJD063hcmgtnCsY-9YG5_cqDTio4M4bu0WNM7a1KbkOHtRwD25qtY324VLHYPX-tpx-oMXnbD59XSCdnuwQM5WghmGRW2xS1CYnFeFGlSUvtOCCacV1JQqMianqWrMkgeq8LM2RZNkYPJ33tsH_9EmL3Pg-uHRSUkIxIxmnPFHoTOngYwy2lm1odioMkmB59E6evJMX7xL_fOZ93_6D_gHlGnJb</recordid><startdate>20180301</startdate><enddate>20180301</enddate><creator>Wang, Yu-Yang</creator><creator>Wang, F Y</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-4157-7714</orcidid></search><sort><creationdate>20180301</creationdate><title>Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way</title><author>Wang, Yu-Yang ; Wang, F Y</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c298t-6db92d6094e0d0d0fd41b18da7785c9896ca8cb95001dbffc67112c477dd41b63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Anisotropy</topic><topic>Astronomical models</topic><topic>Computer simulation</topic><topic>Constraint modelling</topic><topic>Cosmology</topic><topic>Dark energy</topic><topic>Energy equation</topic><topic>Equations of state</topic><topic>Isotropy</topic><topic>Markov analysis</topic><topic>Markov chains</topic><topic>Monte Carlo simulation</topic><topic>Parameters</topic><topic>Supernovae</topic><topic>Universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Yu-Yang</creatorcontrib><creatorcontrib>Wang, F Y</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Yu-Yang</au><au>Wang, F Y</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2018-03-01</date><risdate>2018</risdate><volume>474</volume><issue>3</issue><spage>3516</spage><epage>3522</epage><pages>3516-3522</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>Abstract
In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parameters and cosmological parameters simultaneously employing Markov chain Monte Carlo method. Therefore, the results on the amount of deviation from isotropy of the dark energy equation of state (δ), and the level of anisotropy of the large-scale geometry (Σ0) at present, are totally model-independent. The constraints on the skewness and cosmic shear are −0.101 < δ < 0.071 and −0.007 < Σ0 < 0.008. This result is consistent with a standard isotropic universe (δ = Σ0 = 0). However, a moderate level of anisotropy in the geometry of the Universe and the equation of state of dark energy, is allowed. Besides, there is no obvious evidence for a preferred direction of anisotropic axis in this model.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stx2982</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0003-4157-7714</orcidid></addata></record> |
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| ispartof | Monthly notices of the Royal Astronomical Society, 2018-03, Vol.474 (3), p.3516-3522 |
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| source | Oxford Journals Open Access Collection |
| subjects | Anisotropy Astronomical models Computer simulation Constraint modelling Cosmology Dark energy Energy equation Equations of state Isotropy Markov analysis Markov chains Monte Carlo simulation Parameters Supernovae Universe |
| title | Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way |
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