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 2021학년도 1학기 콜로퀴움 일정 2021.01.13 29168
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 637546
21 Square lattice S=1/2 Heisenberg spin systems: Vanadium oxides and phosphates 2006.01.12 63674
20 <12/12> lattice structure in holographic models 2012.12.12 57574
19 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 58506
18 <12/21(금)> Generic quantum spin ice 2012.12.03 58169
17 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 57679
16 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 72694
» <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 67536
14 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 57965
13 <10/24> Dung-hai Lee 교수와의 간담회 2012.10.23 56074
12 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 56035
11 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 59278
10 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 59907
9 <10/5> Gauge fields. Past, present, future. 2012.10.05 54930
8 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 62574
7 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 58216
6 <9/14> High temperature superconductivity and fluctuating stripe 2012.09.10 54538
5 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 55116
4 <9/7(금)> Kondo Effect in Chiral Orbital Bands 2012.08.31 55480
3 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 55603
2 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 58198