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نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
Symbolic Analytical Developments of the Zero Pressure Cosmological Model of the Universe
Symbolic Analytical Developments of the Zero Pressure Cosmological Model of the Universe
 
الموضوع : فلك 
لغة الوثيقة : الانجليزية 
المستخلص : In the present paper, literal analytical solutions in power series forms are developed for the radius of curvature and the expansion velocity of the zero pressure cosmological models of the universe at any time t. Also, we develop literal analytical solutions in power series forms for the inverse problem of the zero pressure cosmological model, that is to find the time Mathamatical Expression (say) at which the radius of curvature of the model Mathamatical Expression (say) is known. The importance of these analytical power series representations is that, they are invariant under many operations because, addition, multiplication, exponent ion, integration, different ion, etc of a power series is also a power series. A fact which provides excellent flexibility in dealing with analytical as well as computational developments of the problems related to zero pressure cosmological models.For computational developments of these solutions, an efficient method using continued fraction theory is provided. By means of the present methods we able to analyze some known zero-pressure cosmological models, of these are Einstein and De Sitter models. In addition we also analyzed some other models by which one can know if the universe keep expanding forever, or will it reach a maximal size and then turn into contraction stage. © 2008 Springer Science+Business Media B.V. 
ردمد : 0004-640X 
اسم الدورية : Astrophysics and Space Science, Volume 318, Issue 1-2, November 2008, Pages 133-140 
المجلد : 318 
العدد : 1 
سنة النشر : 2008 هـ
2008 م 
عدد الصفحات : 8 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Monday, May 12, 2008 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
محمدعادل عبدالعزيز أحمد شرفSharaf,M.A باحثدكتوراهsharaf_adel@hotmail.com

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