The String Coupling Accelerates the Expansion of the Universe

Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter Q_0 is given by the square of the string coupling, g_s^2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually,...

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Detalles Bibliográficos
Autores principales: Ellis, John R., Mavromatos, N.E., Nanopoulos, Dimitri V.
Lenguaje:eng
Publicado: 2005
Materias:
General Relativity and Cosmology
Acceso en línea:https://dx.doi.org/10.1142/S0218271805008042
https://dx.doi.org/10.1007/s10714-005-0147-3
http://cds.cern.ch/record/830181
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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 Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter Q_0 is given by the square of the string coupling, g_s^2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually, and the observed value of Q_0 coresponds to g_s^2 ~ 0.6. In this scenario, the string coupling is asymptotically free at large times, but its present rate of change is imperceptibly small.
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spelling cern-8301812023-03-14T19:53:46Zdoi:10.1142/S0218271805008042doi:10.1007/s10714-005-0147-3http://cds.cern.ch/record/830181engEllis, John R.Mavromatos, N.E.Nanopoulos, Dimitri V.The String Coupling Accelerates the Expansion of the UniverseGeneral Relativity and CosmologyGeneric cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter Q_0 is given by the square of the string coupling, g_s^2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually, and the observed value of Q_0 coresponds to g_s^2 ~ 0.6. In this scenario, the string coupling is asymptotically free at large times, but its present rate of change is imperceptibly small.Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter Q_0 is given by the square of the string coupling, g_s^2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually, and the observed value of Q_0 coresponds to g_s^2 ~ 0.6. In this scenario, the string coupling is asymptotically free at large times, but its present rate of change is imperceptibly small.gr-qc/0503120ACT-03-05CERN-PH-TH-2005-052MIFP-05-06CERN-PH-TH-2005-052oai:cds.cern.ch:8301812005-03-30
spellingShingle General Relativity and Cosmology
Ellis, John R.
Mavromatos, N.E.
Nanopoulos, Dimitri V.
The String Coupling Accelerates the Expansion of the Universe
title The String Coupling Accelerates the Expansion of the Universe
title_full The String Coupling Accelerates the Expansion of the Universe
title_fullStr The String Coupling Accelerates the Expansion of the Universe
title_full_unstemmed The String Coupling Accelerates the Expansion of the Universe
title_short The String Coupling Accelerates the Expansion of the Universe
title_sort string coupling accelerates the expansion of the universe
topic General Relativity and Cosmology
url https://dx.doi.org/10.1142/S0218271805008042
https://dx.doi.org/10.1007/s10714-005-0147-3
http://cds.cern.ch/record/830181
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AT mavromatosne stringcouplingacceleratestheexpansionoftheuniverse
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