کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1771124 1020727 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Robertson-Walker Branes with massless scalars and cosmological term
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Robertson-Walker Branes with massless scalars and cosmological term
چکیده انگلیسی
In a five-dimensionally warped FRW universe, we integrate the corresponding Einstein equations for a massless scalar source depending on the conformal time alone. The two metric functions, respectively depending on the fifth dimension and on time, are expressed in terms of some integration constants, Q0 and α, which can be related to the five-dimensional gravitational mass scale and to the induced cosmological constant on the brane. We analyze the cases where Q02 and α are both positive and respectively negative quantities and derive, for the corresponding metric functions, the Hubble's rate, the acceleration parameter and the wave function of the scalar field propagating in the brane. It turns out that, in the first case, when the constant potential is converted into a negative Λ-term corresponding to the AdS5 bulk, it yields a periodic universe and the boson wave function is non-linearly oscillating. Secondly, extending the exact solutions for negative values of the integration constants, one deals with a late deSitter stage for an accelerated expanding universe.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Astroparticle Physics - Volume 34, Issue 2, September 2010, Pages 116-120
نویسندگان
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