کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10723392 1033852 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Brane-like singularities with no brane
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Brane-like singularities with no brane
چکیده انگلیسی
We use a method of linearization to study the emergence of the future cosmological singularity characterized by finite value of the cosmological radius. We uncover such singularities that keep Hubble parameter finite while making all higher derivatives of the scale factor (starting out from the a¨) diverge as the cosmological singularity is approached. Since such singularities has been obtained before in the brane world model we name them the “brane-like” singularities. These singularities can occur during the expanding phase in usual Friedmann universe filled with both a self-acting, minimally coupled scalar field and a homogeneous tachyon field. We discover a new type of finite-time, future singularity which is different from type I-IV cosmological singularities in that it has the scale factor, pressure and density finite and nonzero. The generalization of w-singularity is obtained as well.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 689, Issue 1, 17 May 2010, Pages 1-7
نویسندگان
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