Unified cosmology with scalar–tensor theory of gravity
Abstract Unlike the Noether symmetry, a metric independent general conserved current exists for non-minimally coupled scalar–tensor theory of gravity if the trace of the energy-momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in the early vacuum and radiation domin...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-04-01
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| Series: | European Physical Journal C: Particles and Fields |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4785-x |
| _version_ | 1818540316577234944 |
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| author | Behzad Tajahmad Abhik Kumar Sanyal |
| author_facet | Behzad Tajahmad Abhik Kumar Sanyal |
| author_sort | Behzad Tajahmad |
| collection | DOAJ |
| description | Abstract Unlike the Noether symmetry, a metric independent general conserved current exists for non-minimally coupled scalar–tensor theory of gravity if the trace of the energy-momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in the early vacuum and radiation dominated era. For slow roll, symmetry is sacrificed, but at the end of early inflation, such a symmetry leads to a Friedmann-like radiation era. Late-time cosmic acceleration in the matter dominated era is realized in the absence of symmetry, in view of the same decayed and redshifted scalar field. Thus, unification of early inflation with late-time cosmic acceleration with a single scalar field may be realized. |
| first_indexed | 2024-12-11T21:53:45Z |
| format | Article |
| id | doaj.art-373f9938ed5c4a69afb09fbd0202e666 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-11T21:53:45Z |
| publishDate | 2017-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-373f9938ed5c4a69afb09fbd0202e6662022-12-22T00:49:22ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-04-017741910.1140/epjc/s10052-017-4785-xUnified cosmology with scalar–tensor theory of gravityBehzad Tajahmad0Abhik Kumar Sanyal1Faculty of Physics, University of TabrizDepartment of Physics, Jangipur CollegeAbstract Unlike the Noether symmetry, a metric independent general conserved current exists for non-minimally coupled scalar–tensor theory of gravity if the trace of the energy-momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in the early vacuum and radiation dominated era. For slow roll, symmetry is sacrificed, but at the end of early inflation, such a symmetry leads to a Friedmann-like radiation era. Late-time cosmic acceleration in the matter dominated era is realized in the absence of symmetry, in view of the same decayed and redshifted scalar field. Thus, unification of early inflation with late-time cosmic acceleration with a single scalar field may be realized.http://link.springer.com/article/10.1140/epjc/s10052-017-4785-xScalar FieldCosmic Microwave Background RadiationHubble ParameterDeceleration ParameterDark Energy Model |
| spellingShingle | Behzad Tajahmad Abhik Kumar Sanyal Unified cosmology with scalar–tensor theory of gravity European Physical Journal C: Particles and Fields Scalar Field Cosmic Microwave Background Radiation Hubble Parameter Deceleration Parameter Dark Energy Model |
| title | Unified cosmology with scalar–tensor theory of gravity |
| title_full | Unified cosmology with scalar–tensor theory of gravity |
| title_fullStr | Unified cosmology with scalar–tensor theory of gravity |
| title_full_unstemmed | Unified cosmology with scalar–tensor theory of gravity |
| title_short | Unified cosmology with scalar–tensor theory of gravity |
| title_sort | unified cosmology with scalar tensor theory of gravity |
| topic | Scalar Field Cosmic Microwave Background Radiation Hubble Parameter Deceleration Parameter Dark Energy Model |
| url | http://link.springer.com/article/10.1140/epjc/s10052-017-4785-x |
| work_keys_str_mv | AT behzadtajahmad unifiedcosmologywithscalartensortheoryofgravity AT abhikkumarsanyal unifiedcosmologywithscalartensortheoryofgravity |