کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1771545 1523390 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Astroparticle Physics - Volume 27, Issues 2–3, March 2007, Pages 185-198
نویسندگان
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