کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10723290 | 1033846 | 2010 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Time variable cosmological constants from the age of universe
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
In this Letter, time variable cosmological constant, dubbed age cosmological constant, is investigated motivated by the fact: any cosmological length scale and time scale can introduce a cosmological constant or vacuum energy density into Einstein's theory. The age cosmological constant takes the form ÏÎ=3c2MP2/tÎ2, where tÎ is the age or conformal age of our universe. The effective equation of state (EoS) of age cosmological constant are wÎeff=â1+23ΩÎc and wÎeff=â1+23ΩÎc(1+z) when the age and conformal age of universe are taken as the role of cosmological time scales respectively. The EoS are the same as the so-called agegraphic dark energy models. However, the evolution histories are different from the agegraphic ones for their different evolution equations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 690, Issue 4, 28 June 2010, Pages 333-336
Journal: Physics Letters B - Volume 690, Issue 4, 28 June 2010, Pages 333-336
نویسندگان
Lixin Xu, Jianbo Lu, Wenbo Li,