title

کیهانشناسی با ابعاد اضافی واصل عدم قطعیت تعمیم

زینالی, کاظم ، دارابی, فرهاد ، متولی, حسین (1391) کیهانشناسی با ابعاد اضافی واصل عدم قطعیت تعمیم. Journal of Cosmology and Astroparticle Physics ــ 12 . ص.ص.1-18. شاپا 1475-7516

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آدرس اینترنتی رسمی : http://iopscience.iop.org/1475-7516/2012/12/033


عنوان انگليسي

Multi-dimensional cosmology and GUP

خلاصه انگلیسی

We consider a multidimensional cosmological model with FRWtype metric having 4-dimensional space-time and d-dimensional Ricci-flat internal space sectors with a higher dimensional cosmological constant. We study the classical cosmology in commutative and GUP cases and obtain the corresponding exact solutions for negative and positive cosmological constants. It is shown that for negative cosmological constant, the commutative and GUP cases result in finite size universes with smaller size and longer ages, and larger size and shorter age, respectively. For positive cosmological constant, the commutative and GUP cases result in infinite size universes having late time accelerating behavior in good agreement with current observations. The accelerating phase starts in the GUP case sooner than the commutative case. In both commutative and GUP cases, and for both negative and positive cosmological constants, the internal space is stabilized to the sub-Planck size, at least within the present age of the universe. Then, we study the quantum cosmology by deriving the Wheeler-DeWitt equation, and obtain the exact solutions in the commutative case and the perturbative solutions in GUP case, to first order in the GUP small parameter, for both negative and positive cosmological constants. It is shown that good correspondence exists between the classical and quantum solutions.

نوع سند :مقاله
زبان سند : انگلیسی
نویسنده اول :کاظم زینالی
اطلاعات اضافی :Impact Factor: 6.036 Abstracted in : ISI (Science Citation Index-Expanded®, ISI Alerting Services, Current Contents®/Engineering, Computing and Technology, Current Contents®/Physical, Chemical and Earth Sciences), Scopus , Inspec ,Chemical Abstracts Service GEOBASE , MathSciNet , NASA Astrophysics Data System VINITI Abstracts Journal (Referativnyi Zhurnal), Zentralblatt MATH
کلید واژه ها (انگلیسی):multi dimentional cosmology و Generalized Uncertainty principal
موضوعات :WN پرتو شناسی
بخش های دانشگاهی :دانشكده پزشكي > گروه علوم پایه > بخش فیزیک پزشکی
کد شناسایی :3807
ارائه شده توسط : دکتر کاظم زینالی
ارائه شده در تاریخ :03 دی 1391 09:55
آخرین تغییر :22 آبان 1395 12:57

فقط پرسنل کتابخانه صفحه کنترل اسناد

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