کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10724469 1033996 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature evolution of the FRW universe filled with modified Chaplygin gas
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Temperature evolution of the FRW universe filled with modified Chaplygin gas
چکیده انگلیسی
The thermodynamical evolution of the modified Chaplygin gas (MCG) with equation of state p=Bρ−Aρ−α is studied in the context of the Friedmann flat cosmological model. The temperature as a function of redshift z is obtained. In order to describe the universe since the radiation era, the constant B is chosen to be B=1/3. Today's temperature of 2.7 K and the temperature at decoupling (z≈1100) are used to fix the values of the parameters A and α, yielding α=1/4 and A=(B+1)ΩXρ0α+1=(4/3)0.7ρ05/4. With these values, the redshift of the transition from positive to negative acceleration is calculated to be zc=0.18. Using observational data for the redshift at a¨=0 and fixing B=1/3, the best values for the other parameters are α=1/4 and ΩX=0.75, yielding T(z=1100)≈4000K and zc=0.25.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 659, Issue 3, 24 January 2008, Pages 462-465
نویسندگان
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