کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10722286 1033730 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Higgs-Dilaton cosmology: Are there extra relativistic species?
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Higgs-Dilaton cosmology: Are there extra relativistic species?
چکیده انگلیسی
Recent analyses of cosmological data suggest the presence of an extra relativistic component beyond the Standard Model content. The Higgs-Dilaton cosmological model predicts the existence of a massless particle - the dilaton - associated with the spontaneous symmetry breaking of scale invariance and undetectable by any accelerator experiment. Its ultrarelativistic character makes it a suitable candidate for contributing to the effective number of light degrees of freedom in the Universe. In this Letter we analyze the dilaton production at the (p)reheating stage right after inflation and conclude that no extra relativistic degrees of freedom beyond those already present in the Standard Model are expected within the simplest Higgs-Dilaton scenario. The elusive dilaton remains thus essentially undetectable by any particle physics experiment or cosmological observation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 718, Issue 2, 5 December 2012, Pages 507-511
نویسندگان
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