Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data
Abstract The Gaussian linear model provides a unique way to obtain the posterior probability distribution as well as the Bayesian evidence analytically. Considering the expansion rate data, the Gaussian linear model can be applied for $$\varLambda $$ Λ CDM, wCDM and a non-flat $$\varLambda $$ Λ CDM....
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-09-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-022-10737-8 |
| _version_ | 1811273755142389760 |
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| author | Ahmad Mehrabi Jackson Levi Said |
| author_facet | Ahmad Mehrabi Jackson Levi Said |
| author_sort | Ahmad Mehrabi |
| collection | DOAJ |
| description | Abstract The Gaussian linear model provides a unique way to obtain the posterior probability distribution as well as the Bayesian evidence analytically. Considering the expansion rate data, the Gaussian linear model can be applied for $$\varLambda $$ Λ CDM, wCDM and a non-flat $$\varLambda $$ Λ CDM. In this paper, we simulate the expansion data with various precision and obtain the Bayesian evidence, then it has been used to discriminate the models. The data uncertainty is in range $$\sigma \in (0.5,10)\%$$ σ ∈ ( 0.5 , 10 ) % and two different sampling rates have been considered. Our results indicate that considering $$\sigma =0.5\%$$ σ = 0.5 % uncertainty, it is possible to discriminate 2 $$\%$$ % deviation in equation of state from $$w=-1$$ w = - 1 . On the other hand, we investigate how precision of the expansion rate data affects discriminating the $$\varLambda $$ Λ CDM from a non-flat $$\varLambda $$ Λ CDM model. Finally, we perform a parameters inference in both the MCMC and Gaussian linear model, using current available expansion rate data and compare the results. |
| first_indexed | 2024-04-12T23:05:05Z |
| format | Article |
| id | doaj.art-cf64a2b767f847c697789e28fffc007e |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-12T23:05:05Z |
| publishDate | 2022-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-cf64a2b767f847c697789e28fffc007e2022-12-22T03:12:57ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522022-09-018291810.1140/epjc/s10052-022-10737-8Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion dataAhmad Mehrabi0Jackson Levi Said1Department of Physics, Bu-Ali Sina UniversityInstitute of Space Sciences and Astronomy, University of MaltaAbstract The Gaussian linear model provides a unique way to obtain the posterior probability distribution as well as the Bayesian evidence analytically. Considering the expansion rate data, the Gaussian linear model can be applied for $$\varLambda $$ Λ CDM, wCDM and a non-flat $$\varLambda $$ Λ CDM. In this paper, we simulate the expansion data with various precision and obtain the Bayesian evidence, then it has been used to discriminate the models. The data uncertainty is in range $$\sigma \in (0.5,10)\%$$ σ ∈ ( 0.5 , 10 ) % and two different sampling rates have been considered. Our results indicate that considering $$\sigma =0.5\%$$ σ = 0.5 % uncertainty, it is possible to discriminate 2 $$\%$$ % deviation in equation of state from $$w=-1$$ w = - 1 . On the other hand, we investigate how precision of the expansion rate data affects discriminating the $$\varLambda $$ Λ CDM from a non-flat $$\varLambda $$ Λ CDM model. Finally, we perform a parameters inference in both the MCMC and Gaussian linear model, using current available expansion rate data and compare the results.https://doi.org/10.1140/epjc/s10052-022-10737-8 |
| spellingShingle | Ahmad Mehrabi Jackson Levi Said Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data European Physical Journal C: Particles and Fields |
| title | Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data |
| title_full | Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data |
| title_fullStr | Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data |
| title_full_unstemmed | Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data |
| title_short | Gaussian discriminators between $$\varLambda $$ Λ CDM and wCDM cosmologies using expansion data |
| title_sort | gaussian discriminators between varlambda λ cdm and wcdm cosmologies using expansion data |
| url | https://doi.org/10.1140/epjc/s10052-022-10737-8 |
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