Sharif University of Technology - Weekly Cosmology Seminar ( Sunday- 30 October 2016 - 9 Aban 1395)
دانشکده فیزیک دانشگاه صنعتی شریف
سمینار هفتگی گروه کیهان شناسی
Closed FLRW model in loop quantum cosmology and its effective dynamics
آسیه کرمی (پژوهشکده نجوم پژوهشگاه دانش های بنیادی - IPM)
I will review the quantization and effective dynamics of closed FLRW model within loop quantum cosmology, paying special attention to the existence of an ambiguity in the quantization process. This ambiguity arises from different ways of defining the curvature operator. One definition is through closed paths and the other one is through open paths. For spatially flat models these two methods coincide and for spatially non-flat anisotropic models the first one is not admissible. However in the case of the closed FLRW model, one can apply both methods and they yield different quantum theories. In this talk I will show the different effective descriptions they provide of the bouncing cyclic universe. In particular, the most significant difference is that in the theory defined by the 'open path' method, there is not one, but two different bounces through which the cyclic universe alternates. Also, I will show that the quantum corrections of both theories can cure the unboundedness of matter density and expansion in effective phase space.
یکشنبه 9 آبان ماه 1395، ساعت 15:00
دانشکده فیزیک، تالار پرتوی