korean english


Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다.


                    아       래


제목: Cosmological viable scalar-tensor theories of gravity

연사: Dr. Seokcheon Lee (KIAS)

일시: 2012. 11. 21(수) 4pm

장소: To be announced

초록: In spite of their original discrepancy, both dark energy and modified theory of gravity can be parameterized by the effective equation of state (EOS) w for the expansion history of the Universe. A useful model independent approach to the EOS of them can be given by so-called Chevallier-Polarski-Linder (CPL) parametrization where two parameters of it (w0 and wa) can be constrained by the geometrical observations which suffer from degeneracies between models. The linear growth of large scale structure is usually used to remove these degeneracies. This growth can be described by the growth index parameter gamma and it can be parameterized by gamma0 + gamma a (1 - a) in general. We use the scalar-tensor theories of gravity (STG) and show that the discernment between models is possible only when gamma_a is not negligible. We show that the linear density perturbation of the matter component as a function of redshift severely constrains the viable subclasses of STG in terms of w and gamma. From this method, we can rule out or prove the viable STG in future observations. When we use Z(phi) =1, F shows the convex shape of evolution in a viable STG model. The viable STG models with Z(phi) = 1 are not distinguishable from dark energy models when we strongly limit the solar system constraint.

번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 27601
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 972413
120 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 88646
119 <6/5>Magnetism and Superconductivity 2009.05.27 88724
118 <1/26> Hamiltonian formalism 2011.01.19 88736
117 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 88915
116 <10/10> Spin transistor : Detection and manipulation of spin transport in semiconductor 2012.09.27 89218
115 <4/28> Generalised cosmological scaling solutions in braneworld and their duality properties 2006.04.24 89329
114 <11/26(수)> Neutrino Physics with KamLAND 2014.11.20 89718
113 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 89831
112 <11/19> From Schrödinger's cat to quantum technology using light 2010.11.11 90296
111 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 90607
110 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 90623
109 <4/22> How Many is Different? Ideal Bose gas revisited 2011.04.22 90806
108 <10/15> An Ideal Mean-Field Transition in a Driven Interacting System 2009.09.30 90884
107 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 90981
106 <11/6> Graphene plasmon and Plasmonics 2013.10.31 91096
105 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 91212
104 <11/22>A Glimpse of X-ray Sky 2006.11.16 91577
103 <8/17> AdS Black Hole Solutions in Extended New Massive Gravity 2010.08.16 91587
102 <Nov. 18(Wed.) 4:30 PM> Single-molecule chemistry and spectroscopy on ultrathin insulating films 2015.11.11 91860
101 <4/27> Organic-based Magnet and Organic-based spintronics : New science and Technologies 2010.04.22 91913