کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1842434 1031442 2013 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Statistical anisotropy from vector curvaton in D-brane inflation
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Statistical anisotropy from vector curvaton in D-brane inflation
چکیده انگلیسی
We investigate the possibility of embedding the vector curvaton paradigm in D-brane models of inflation in type IIB string theory in a simple toy model. The vector curvaton is identified with the U(1) gauge field that lives on the world volume of a D3-brane, which may be stationary or undergoing general motion in the internal space. The dilaton is considered as a spectator field which modulates the evolution of the vector field. In this set-up, the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation assuming that the dilaton evolves as e−ϕ∝a2 where a(t) is the scale factor. Our work constitutes a first step towards exploring how such distinctive features may arise from the presence of several light fields that naturally appear in string theory models of cosmology.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 868, Issue 1, 1 March 2013, Pages 120-155
نویسندگان
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