logo

korean english

게시판

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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1079506
166 <12/21(금)> Generic quantum spin ice 2012.12.03 67382
165 <4/3> 내 안의 파장을 바꿔라! 2013.03.29 67190
164 <10/1(수)> 초전도 양자컴퓨터 - Superconducting qubit and circuit QED 2014.09.26 67080
163 <March.24(Thu) 14:00> A new boson and muon g-2 2016.03.17 67069
162 <9/11(목)> The effects of dark matter elastic scattering on the cosmological signals 2014.09.01 66948
161 <9/24(수)> Design Principles of Cellular Networks 2014.09.18 66915
160 <7/18(Mon.) 14:00> GEANT4 Particle Physics Simulation Software: A Brief Overview From a User’s Perspective 2016.07.15 66896
159 <8/21(Mon.)10:30>Non-Gaussianity as a Particle Detector 2017.08.17 66512
158 <10/2> What's the matter? 2013.09.26 66509
157 <4/15(수)> 세미나 개최 안내 2015.04.09 66509
156 <Oct. 14(Wed.) 4:30 PM> 국방과학기술과 물리학 2015.10.07 66277
155 <2/7> Exotic phases in pyrochlore iridates 2013.02.05 66223
154 <10/15(수)> 첨단 과학 기술의 세계와 물리학의 위상 2014.10.08 66076
153 <Oct. 12(Wed.) 4:30 PM> Silk as a biocompatible optical material 2016.10.05 65839
152 <10/5> Gauge fields. Past, present, future. 2012.10.05 65647
151 <7/15(Fri.) 11:00> Observation of a field induced quantum spin liquid in α-RuCl3 2016.07.14 65585
150 <4/8(수) 오후4:30분> 우라늄의 일생 2015.04.02 65381
149 <3/18(수) 오후4:30분> 시장리스크 관리(Market Risk Management) 소개 2015.03.11 65036
148 <Dec.12(Wed.)> First-principles studies of complex oxides interfaces 2018.12.05 64972
147 <10/30> 광섬유 센서 2013.10.17 64707