Irreversible Thermodynamics of the Universe: Constraints from Planck Data
The present work deals with irreversible universal thermodynamics. The homogenous and isotropic flat model of the universe is chosen as open thermodynamical system and nonequilibrium thermodynamics comes into picture. For simplicity, entropy flow is considered only due to heat conduction. Further, d...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2014/652962 |
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| author | Subhajit Saha Atreyee Biswas Subenoy Chakraborty |
| author_facet | Subhajit Saha Atreyee Biswas Subenoy Chakraborty |
| author_sort | Subhajit Saha |
| collection | DOAJ |
| description | The present work deals with irreversible universal thermodynamics. The homogenous and isotropic flat model of the universe is chosen as open thermodynamical system and nonequilibrium thermodynamics comes into picture. For simplicity, entropy flow is considered only due to heat conduction. Further, due to Maxwell-Cattaneo modified Fourier law for nonequilibrium phenomenon, the temperature satisfies damped wave equation instead of heat conduction equation. Validity of generalized second law of thermodynamics (GSLT) has been investigated for universe bounded by apparent or event horizon with cosmic substratum as perfect fluid with constant or variable equation of state or interacting dark species. Finally, we have used three Planck data sets to constrain the thermal conductivity λ and the coupling parameter b2. These constraints must be satisfied in order for GSLT to hold for universe bounded by apparent or event horizons. |
| format | Article |
| id | doaj-art-8e0f760cc3ba4e0ca7b6bc2ae0739e5e |
| institution | OA Journals |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-8e0f760cc3ba4e0ca7b6bc2ae0739e5e2025-08-20T02:09:40ZengWileyAdvances in High Energy Physics1687-73571687-73652014-01-01201410.1155/2014/652962652962Irreversible Thermodynamics of the Universe: Constraints from Planck DataSubhajit Saha0Atreyee Biswas1Subenoy Chakraborty2Department of Mathematics, Jadavpur University, Kolkata, West Bengal 700032, IndiaDepartment of Natural Sciences, West Bengal University of Technology, BF 142, Sector 1, Salt Lake, Kolkata, West Bengal 700064, IndiaDepartment of Mathematics, Jadavpur University, Kolkata, West Bengal 700032, IndiaThe present work deals with irreversible universal thermodynamics. The homogenous and isotropic flat model of the universe is chosen as open thermodynamical system and nonequilibrium thermodynamics comes into picture. For simplicity, entropy flow is considered only due to heat conduction. Further, due to Maxwell-Cattaneo modified Fourier law for nonequilibrium phenomenon, the temperature satisfies damped wave equation instead of heat conduction equation. Validity of generalized second law of thermodynamics (GSLT) has been investigated for universe bounded by apparent or event horizon with cosmic substratum as perfect fluid with constant or variable equation of state or interacting dark species. Finally, we have used three Planck data sets to constrain the thermal conductivity λ and the coupling parameter b2. These constraints must be satisfied in order for GSLT to hold for universe bounded by apparent or event horizons.http://dx.doi.org/10.1155/2014/652962 |
| spellingShingle | Subhajit Saha Atreyee Biswas Subenoy Chakraborty Irreversible Thermodynamics of the Universe: Constraints from Planck Data Advances in High Energy Physics |
| title | Irreversible Thermodynamics of the Universe: Constraints from Planck Data |
| title_full | Irreversible Thermodynamics of the Universe: Constraints from Planck Data |
| title_fullStr | Irreversible Thermodynamics of the Universe: Constraints from Planck Data |
| title_full_unstemmed | Irreversible Thermodynamics of the Universe: Constraints from Planck Data |
| title_short | Irreversible Thermodynamics of the Universe: Constraints from Planck Data |
| title_sort | irreversible thermodynamics of the universe constraints from planck data |
| url | http://dx.doi.org/10.1155/2014/652962 |
| work_keys_str_mv | AT subhajitsaha irreversiblethermodynamicsoftheuniverseconstraintsfromplanckdata AT atreyeebiswas irreversiblethermodynamicsoftheuniverseconstraintsfromplanckdata AT subenoychakraborty irreversiblethermodynamicsoftheuniverseconstraintsfromplanckdata |