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Cosmic Acceleration and the String Coupling
In the context of a cosmological string model describing the propagation of strings in a time-dependent Robertson-Walker background space-time, we show that the asymptotic acceleration of the Universe can be identified with the square of the string coupling. This allows for a direct measurement of t...
| Autores principales: | , , |
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| Lenguaje: | eng |
| Publicado: |
2004
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2005.05.047 http://cds.cern.ch/record/811969 |
| _version_ | 1780905319657897984 |
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| author | Ellis, John R. Mavromatos, N.E. Nanopoulos, Dimitri V. |
| author_facet | Ellis, John R. Mavromatos, N.E. Nanopoulos, Dimitri V. |
| author_sort | Ellis, John R. |
| collection | CERN |
| description | In the context of a cosmological string model describing the propagation of strings in a time-dependent Robertson-Walker background space-time, we show that the asymptotic acceleration of the Universe can be identified with the square of the string coupling. This allows for a direct measurement of the ten-dimensional string coupling using cosmological data. We conjecture that this is a generic feature of a class of non-critical string models that approach asymptotically a conformal (critical) sigma model whose target space is a four-dimensional space-time with a dilaton background that is linear in sigma-model time. The relation between the cosmic acceleration and the string coupling does not apply in critical strings with constant dilaton fields in four dimensions. |
| id | cern-811969 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2004 |
| record_format | invenio |
| spelling | cern-8119692023-03-14T20:23:23Zdoi:10.1016/j.physletb.2005.05.047http://cds.cern.ch/record/811969engEllis, John R.Mavromatos, N.E.Nanopoulos, Dimitri V.Cosmic Acceleration and the String CouplingParticle Physics - TheoryIn the context of a cosmological string model describing the propagation of strings in a time-dependent Robertson-Walker background space-time, we show that the asymptotic acceleration of the Universe can be identified with the square of the string coupling. This allows for a direct measurement of the ten-dimensional string coupling using cosmological data. We conjecture that this is a generic feature of a class of non-critical string models that approach asymptotically a conformal (critical) sigma model whose target space is a four-dimensional space-time with a dilaton background that is linear in sigma-model time. The relation between the cosmic acceleration and the string coupling does not apply in critical strings with constant dilaton fields in four dimensions.In the context of a cosmological string model describing the propagation of strings in a time-dependent Robertson-Walker background space-time, we show that the asymptotic acceleration of the Universe can be identified with the square of the string coupling. This allows for a direct measurement of the ten-dimensional string coupling using cosmological data. We conjecture that this is a generic feature of a class of non-critical string models that approach asymptotically a conformal (critical) sigma model whose target space is a four-dimensional space-time with a dilaton background that is linear in sigma-model time. The relation between the cosmic acceleration and the string coupling does not apply in critical strings with constant dilaton fields in four dimensions.In the context of a cosmological string model describing the propagation of strings in a time-dependent Robertson–Walker background space–time, we show that the asymptotic acceleration of the Universe can be identified with the square of the string coupling. This allows for a direct measurement of the ten-dimensional string coupling using cosmological data. We conjecture that this is a generic feature of a class of non-critical string models that approach asymptotically a conformal (critical) σ model whose target space is a four-dimensional space–time with a dilaton background that is linear in σ -model time. The relation between the cosmic acceleration and the string coupling does not apply in critical strings with constant dilaton fields in four dimensions.hep-th/0412240CERN-PH-TH-2004-264MIFP-04-27ACT-06-04CERN-PH-TH-2004-264MIFP-2004-27ACT-04oai:cds.cern.ch:8119692004-12-20 |
| spellingShingle | Particle Physics - Theory Ellis, John R. Mavromatos, N.E. Nanopoulos, Dimitri V. Cosmic Acceleration and the String Coupling |
| title | Cosmic Acceleration and the String Coupling |
| title_full | Cosmic Acceleration and the String Coupling |
| title_fullStr | Cosmic Acceleration and the String Coupling |
| title_full_unstemmed | Cosmic Acceleration and the String Coupling |
| title_short | Cosmic Acceleration and the String Coupling |
| title_sort | cosmic acceleration and the string coupling |
| topic | Particle Physics - Theory |
| url | https://dx.doi.org/10.1016/j.physletb.2005.05.047 http://cds.cern.ch/record/811969 |
| work_keys_str_mv | AT ellisjohnr cosmicaccelerationandthestringcoupling AT mavromatosne cosmicaccelerationandthestringcoupling AT nanopoulosdimitriv cosmicaccelerationandthestringcoupling |