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 1056790
562 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 106160
561 <11/13> Computer-Aided Engineering for Nucleic Acid Nanostructures 2013.11.07 106004
560 <11/16> Study of carrier transport and charging effects in organic devices 2011.11.10 106002
559 <4/27> RENO Reactor Neutrino Experiment 2011.04.18 105998
558 2014학년도 2학기 콜로퀴움 일정 2014.09.11 105863
557 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 105847
556 <9/11> Complex networks in technology, biology and sociology 2009.09.04 105815
555 <11/9> Bosons in high Tc superconductors: an experimental survey 2011.10.31 105286
554 <12/4> The "Physics" of Climate Change 2009.12.02 104794
553 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 104755
552 <4/16> Lasers, Microscopes, and Superconductors: Laser Scanning Microscopy of Superconducting Circuits 2014.04.10 104130
551 <6/2>백색 LED를 이용한 반도체조명에 관하여 2006.05.29 104088
550 <4/18> Action-angle variables for the near-horizon extreme black hole particle dynamics 2012.04.17 104036
549 <2/1> The Surface Science of Adsorption on Crystalline Ferroelectric Polymer Surfaces 2010.01.25 103928
548 <Oct.10(Wed.) 4:30 PM> Standard Model of Cosmology and Beyond 2018.09.21 102959
547 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 102772
546 2014학년도 1학기 콜로퀴움 일정 2014.03.03 102361
545 <8/11>Cooking up elements in the universe: Recent activities at HRIBF 2009.08.11 102254
544 <6/1> Electron phonon coupling effect in 4d transition metal oxide magnetism 2011.05.26 101803
543 <8/4> Remarks on the Scalar Graviton and Consistency of Horava Gravity 2010.07.28 101375