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공공누리This item is licensed Korea Open Government License

Title
Conformal Frame Dependence on Cosmological Observations in Scalar-Tensor Theories of Gravity
Author(s)
현영환이석천김윤배
Publication Year
2019-06-30
Abstract
Cosmological observations provide more accurate values both for the background evolution of the Universe and for the structure formation. These values are given by the so-called dark energy equation of state, ω, and the growth index parameter, γ. From these observed parameters, one can reconstruct the model functions in scalar-tensor gravity theories. However, there is a long-standing debate about the (in)equality between conformally transformed frames in scalar-tensor gravity models and some cosmological observables have been shown to be frame independent and others frame dependent. We focus on the cosmological evolutions of the frame-dependent observables, which are functions of the frame-independent parameter, the redshift. Thus, if one measures the cosmological parameters ω and γ from the frame-dependent cosmological observables in one specific frame, then all of the other observables should also be interpreted in that frame with the same cosmological parameters obtained from that measurement. If one analyzes the same observables in another frame, then the obtained cosmological parameters should be different from those of the original frame. This explicitly shows the frame dependence of cosmological observables. Also, our method provides a model-independent analysis of scalar-tensor theories of gravity models about various observables in both frames.
Keyword
등각변환; 수정중력이론; 암흑에너지; 우주론적 관측치; Conformal transformation; Modified gravity theories; Dark energy; Cosmological observabales
Journal Title
Journal of the Korean Physical Society;
Citation Volume
74
ISSN
0374-4884
DOI
10.3938/jkps.74.1101
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Appears in Collections:
7. KISTI 연구성과 > 학술지 발표논문
URI
https://repository.kisti.re.kr/handle/10580/16074
Fulltext
 https://scienceon.kisti.re.kr/srch/selectPORSrchArticle.do?cn=NART99437225
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