Cosmological Applications of Filamentary Structures in the Universe
우주에 있는 필라멘트 구조물의 우주론적 응용

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자연과학대학 물리·천문학부(천문학전공)
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서울대학교 대학원
학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 물리·천문학부(천문학전공), 2018. 8. 이정훈.
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.
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College of Natural Sciences (자연과학대학)Dept. of Physics and Astronomy (물리·천문학부)Astronomy (천문학전공)Theses (Ph.D. / Sc.D._천문학전공)
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