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Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies

We discuss fits of cosmological dark energy models to the available data on high-redshift supernovae. We consider a conventional model with cold dark matter and a cosmological constant (ΛCDM), a model invoking super-horizon perturbations (SHCDM) and models based on Liouville strings in which dark en...

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Detalles Bibliográficos
Autores principales: Ellis, Jonathan Richard, Mavromatos, N E, Mitsou, V A, Nanopoulos, D V
Lenguaje:eng
Publicado: 2007
Materias:
Acceso en línea:http://cds.cern.ch/record/1062707
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author Ellis, Jonathan Richard
Mavromatos, N E
Mitsou, V A
Nanopoulos, D V
author_facet Ellis, Jonathan Richard
Mavromatos, N E
Mitsou, V A
Nanopoulos, D V
author_sort Ellis, Jonathan Richard
collection CERN
description We discuss fits of cosmological dark energy models to the available data on high-redshift supernovae. We consider a conventional model with cold dark matter and a cosmological constant (ΛCDM), a model invoking super-horizon perturbations (SHCDM) and models based on Liouville strings in which dark energy is provided by a rolling dilaton field (Q-cosmology). We show that a complete treatment of Q-cosmology requires a careful discussion of non-equilibrium situations (off-shell effects). The two main high-redshift supernova data sets give compatible constraints on ΛCDM and the other models. We recover the well-known result that ΛCDM fits very well the combined supernova data sets, as does the super-horizon model. We discuss the model-dependent off-shell corrections to the Q-cosmology model that are relevant to the supernova data, and show that this model fits the data equally well. This analysis could be extended to other aspects of cosmological phenomenology, in particular to the CMB and baryon acoustic oscillations, which have so far been treated using on-shell models.
id cern-1062707
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2007
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spelling cern-10627072019-09-30T06:29:59Zhttp://cds.cern.ch/record/1062707engEllis, Jonathan RichardMavromatos, N EMitsou, V ANanopoulos, D VConfronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologiesAstrophysics and AstronomyWe discuss fits of cosmological dark energy models to the available data on high-redshift supernovae. We consider a conventional model with cold dark matter and a cosmological constant (ΛCDM), a model invoking super-horizon perturbations (SHCDM) and models based on Liouville strings in which dark energy is provided by a rolling dilaton field (Q-cosmology). We show that a complete treatment of Q-cosmology requires a careful discussion of non-equilibrium situations (off-shell effects). The two main high-redshift supernova data sets give compatible constraints on ΛCDM and the other models. We recover the well-known result that ΛCDM fits very well the combined supernova data sets, as does the super-horizon model. We discuss the model-dependent off-shell corrections to the Q-cosmology model that are relevant to the supernova data, and show that this model fits the data equally well. This analysis could be extended to other aspects of cosmological phenomenology, in particular to the CMB and baryon acoustic oscillations, which have so far been treated using on-shell models.oai:cds.cern.ch:10627072007
spellingShingle Astrophysics and Astronomy
Ellis, Jonathan Richard
Mavromatos, N E
Mitsou, V A
Nanopoulos, D V
Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title_full Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title_fullStr Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title_full_unstemmed Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title_short Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
title_sort confronting dark energy models with astrophysical data: non-equilibrium vs. conventional cosmologies
topic Astrophysics and Astronomy
url http://cds.cern.ch/record/1062707
work_keys_str_mv AT ellisjonathanrichard confrontingdarkenergymodelswithastrophysicaldatanonequilibriumvsconventionalcosmologies
AT mavromatosne confrontingdarkenergymodelswithastrophysicaldatanonequilibriumvsconventionalcosmologies
AT mitsouva confrontingdarkenergymodelswithastrophysicaldatanonequilibriumvsconventionalcosmologies
AT nanopoulosdv confrontingdarkenergymodelswithastrophysicaldatanonequilibriumvsconventionalcosmologies