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 1078457
15 <8/20> Radioprotection effect and anti-tumor immunity by TCM-EF in mice 2013.08.21 177141
14 <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 177504
13 <4/18(금)> 양자물질초전도체창의연구소 초청 세미나 2014.04.15 178409
12 <12/20(Thu) 2:00pm> Gravitating Spinning Stars (a particle theorist's perspective) 2018.12.17 183707
» <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 198582
10 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 205053
9 <5/16(토)> 세미나 개최 안내 2015.05.18 216575
8 <11/5(화)> 특별세미나 개최 안내 2013.11.01 230028
7 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 235015
6 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 243314
5 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 243460
4 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 245900
3 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 252658
2 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 295364
1 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 400510