Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy
We update gamma-ray burst (GRB) luminosity relations among certain spectral and light-curve features with 139 GRBs. The distance modulus of 82 GRBs at z>1.4 can be calibrated with the sample at z≤1.4 by using the cubic spline interpolation method from the Union2.1 Type Ia supernovae (SNe Ia) set....
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2015/576093 |
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| author | Jun-Jie Wei Qing-Bo Ma Xue-Feng Wu |
| author_facet | Jun-Jie Wei Qing-Bo Ma Xue-Feng Wu |
| author_sort | Jun-Jie Wei |
| collection | DOAJ |
| description | We update gamma-ray burst (GRB) luminosity relations among certain spectral and light-curve features with 139 GRBs. The distance modulus of 82 GRBs at z>1.4 can be calibrated with the sample at z≤1.4 by using the cubic spline interpolation method from the Union2.1 Type Ia supernovae (SNe Ia) set. We investigate the joint constraints on the Cardassian expansion model and dark energy with 580 Union2.1 SNe Ia sample (z<1.4) and 82 calibrated GRBs’ data (1.4<z≤8.2). In ΛCDM, we find that adding 82 high-z GRBs to 580 SNe Ia significantly improves the constraint on Ωm-ΩΛ plane. In the Cardassian expansion model, the best fit is Ωm=0.24-0.15+0.15 and n=0.16-0.52+0.30 (1σ), which is consistent with the ΛCDM cosmology (n=0) in the 1σ confidence region. We also discuss two dark energy models in which the equation of state w(z) is parameterized as w(z)=w0 and w(z)=w0+w1z/(1+z), respectively. Based on our analysis, we see that our universe at higher redshift up to z=8.2 is consistent with the concordance model within 1σ confidence level. |
| format | Article |
| id | doaj-art-3b202d1516f24e29a4e8de8dabb2eeb1 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-3b202d1516f24e29a4e8de8dabb2eeb12025-08-20T03:55:36ZengWileyAdvances in Astronomy1687-79691687-79772015-01-01201510.1155/2015/576093576093Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark EnergyJun-Jie Wei0Qing-Bo Ma1Xue-Feng Wu2Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, ChinaPurple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, ChinaPurple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, ChinaWe update gamma-ray burst (GRB) luminosity relations among certain spectral and light-curve features with 139 GRBs. The distance modulus of 82 GRBs at z>1.4 can be calibrated with the sample at z≤1.4 by using the cubic spline interpolation method from the Union2.1 Type Ia supernovae (SNe Ia) set. We investigate the joint constraints on the Cardassian expansion model and dark energy with 580 Union2.1 SNe Ia sample (z<1.4) and 82 calibrated GRBs’ data (1.4<z≤8.2). In ΛCDM, we find that adding 82 high-z GRBs to 580 SNe Ia significantly improves the constraint on Ωm-ΩΛ plane. In the Cardassian expansion model, the best fit is Ωm=0.24-0.15+0.15 and n=0.16-0.52+0.30 (1σ), which is consistent with the ΛCDM cosmology (n=0) in the 1σ confidence region. We also discuss two dark energy models in which the equation of state w(z) is parameterized as w(z)=w0 and w(z)=w0+w1z/(1+z), respectively. Based on our analysis, we see that our universe at higher redshift up to z=8.2 is consistent with the concordance model within 1σ confidence level.http://dx.doi.org/10.1155/2015/576093 |
| spellingShingle | Jun-Jie Wei Qing-Bo Ma Xue-Feng Wu Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy Advances in Astronomy |
| title | Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy |
| title_full | Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy |
| title_fullStr | Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy |
| title_full_unstemmed | Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy |
| title_short | Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy |
| title_sort | utilizing the updated gamma ray bursts and type ia supernovae to constrain the cardassian expansion model and dark energy |
| url | http://dx.doi.org/10.1155/2015/576093 |
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