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 1078866
166 <Oct. 11(Wed.) 4:30 PM> Graphene Membrane for Imaging Molecular Assembly and Dynamics 2017.09.27 50779
165 <Oct. 18(Wed.) 4:30 PM> AlGaN/GaN HEMT 센서플랫폼 (KANCSensGaNTM) 기술 소개 file 2017.10.11 53612
164 <Nov. 1(Wed.) 4:30 PM> 광자와 이온트랩을 이용한 양자 정보처리 2017.10.25 46365
163 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 114608
162 <Nov.15(Wed.) 4:30 PM> Mixed metal oxide films for energy and memory device applications 2017.11.08 62664
161 <Nov.22(Wed.) 4:30 PM> Dark Side of the Universe 2017.11.15 69495
160 <Nov.29(Wed.) 4:30 PM> The Intensity Frontier Experiment & SHiP 2017.11.22 46341
159 <Dec.6(Wed.) 4:30 PM> 실험핵천체물리학: 과거와 미래(Experimental Nuclear Astrophysics: Past and Future) 2017.11.29 45584
158 <Dec.13(Wed.) 4:30 PM>기본에 충실하고 새로움에 도전한다 - 자율주행자동차의 핵심 기술들 – 2017.12.07 56437
157 2018학년도 1학기 콜로퀴움 일정 2018.01.03 110571
156 <3/2(Fri.)11:00>Evolving magnetic interactions near a Kondo breakdown 2018.02.27 69824
155 <Mar.7(Wed.) 4:30 PM>Acoustic metamaterial: principles and applications of phononic crystals 2018.03.02 46107
154 <Mar.21(Wed.) 4:30 PM>깊은 땅속 중성미자 실험, DUNE 2018.03.14 46517
153 <3/16(Fri.)11:00> Superlattice phonons of two dimensional heterostructures 2018.03.16 84362
152 <Mar.28(Wed.) 4:30 PM>우주의 번개와 천둥 2018.03.27 45144
151 <April.4(Wed.) 4:30 PM>From Static to Dynamic Multiferroics 2018.03.29 77147
150 <April.11(Wed.) 4:30 PM>History of Superconductivity and its Future 2018.04.04 49563
149 <April.18(Wed.) 4:30 PM>금속의'블랙스완' 2018.04.11 44297
148 <May.2(Wed.) 4:30 PM> Machine learning and statistical physics 2018.04.23 80623
147 <May.9(Wed.) 4:30 PM> "How gold was produced in the universe?" 2018.05.02 89753