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작성자 CQUeST 날짜 2018-04-02
제목 [Seminar] Apr. 5 (Thu), 4:30 pm, Sohyun Park
Seminar
DATE & TIME   Apr. 5 (Thu), 4:30 pm
PLACE   R1029
SPEAKER   Sohyun Park
HOST   Bum-Hoon Lee
INSTITUTE   Institute of Physics of the Czech Academy of Sciences, Prague, Czech
TITLE   Revival of the Deser-Woodard nonlocal gravity model
ABSTRACT

  I will review a nonlocal gravity model proposed by Deser and Woodard to explain the current phase of cosmic acceleration without dark energy. I will present how the model reproduces the LambdaCDM expansion history without a cosmological constant and what is its prediction for cosmic structure formation, which turned out to be in better agreement with data than the one predicted by LambdaCDM. The studies of the structure formation were carried out by two groups, one in a localized formulation employed by Nersisyan, Fernandez Cid and Amendola and the other in the original nonlocal form by Dodelson and myself. By comparing these two formulations, I will show that they give the same solutions for perturbation variables provided the boundary conditions are set the same. I will also briefly discuss some conceptual issues in nonlocal gravity (including the Deser-Woodard model and other classes of nonlocal models introducing a new mass scale) such as causality, degrees of freedom and stability.


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