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Cosmological Applications of Filamentary Structures in the Universe : 우주에 있는 필라멘트 구조물의 우주론적 응용
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- Authors
- Advisor
- 이정훈
- Major
- 자연과학대학 물리·천문학부(천문학전공)
- Issue Date
- 2018-08
- Publisher
- 서울대학교 대학원
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 물리·천문학부(천문학전공), 2018. 8. 이정훈.
- Abstract
- The formation and evolution of filamentary structures involve the actions of the
dark sector and gravitational law. At the same time, a filament is an important environment
through which gas and matter accrete and subhalos infall onto its member
galaxies (halos). In this thesis, we present studies on filamentary structures in two
contexts, one for filament as a probe to constrain cosmological models and the other
for studying the effects of filaments on its halos and galaxies. In Part 1, we presented
how the shapes of filaments change depending on cosmological models. We identified
large-scale filaments from dark matter halos of cosmological simulations of various cosmological
models including ΛCDM, a branch of dynamic dark energy, and a branch of
modified gravity. It is found that filaments in the ΛCDM universe are straighter than
those in the other models. We also found that the discriminations of the alternative
models from ΛCDM and between themselves are possible with the straightness evolution
of filaments. By finding the dependence of filament straightness on underlying
cosmology, we suggest the straightness of filaments as a complimentary cosmological
test. In Part 2, we studied the roles of filaments in the galaxy (halo) formation and
evolution. First, we examined the dependence of substructure abundance of clusters
on filament straightness. Clusters in straighter filaments are found to have fewer substructures
even when the contribution of the mass and formation time of halo, and
the number of clusters in filament are minimized. On the other hand, we also studied
the correlation between void galaxy luminosity and straightness of void filament. It
was found that void galaxies are brighter in straighter void filaments. Based on these
findings, we conclude that filaments influence on their galaxies (halos) by controlling
subhalo infall and mass accretion onto galaxies (halos). Physical interpretations of our
results, as well as their cosmological implications are presented.
- Language
- English
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