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Finite-time blow-up to hyperbolic Keller-Segel system of consumption type with logarithmic sensitivity : 로그 민감도를 갖는 쌍곡 Keller-Segel 소비 유형 시스템에 대한 유한 시간 폭발

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dc.contributor.advisor정인지-
dc.contributor.author나정경-
dc.date.accessioned2023-11-20T04:49:26Z-
dc.date.available2023-11-20T04:49:26Z-
dc.date.issued2023-
dc.identifier.other000000177574-
dc.identifier.urihttps://hdl.handle.net/10371/197300-
dc.identifier.urihttps://dcollection.snu.ac.kr/common/orgView/000000177574ko_KR
dc.description학위논문(석사) -- 서울대학교대학원 : 자연과학대학 수리과학부, 2023. 8. 정인지.-
dc.description.abstractThis paper deals with a hyperbolic Keller-Segel system of consumption type
with the logarithmic sensitivity
∂tρ = −χ∇ · (ρ∇log c) , ∂tc = −μcρ (χ, μ > 0)
in Rd (d ≥ 1) for nonvanishing initial data. This system is closely related to
tumor angiogenesis, an important example of chemotaxis.We firstly show the
local existence of smooth solutions corresponding to nonvanishing smooth initial
data. Next, through Riemann invariants, we present some sufficient conditions
of this initial data for finite-time singularity formation when d = 1.
We then prove that for any d ≥ 1, some nonvanishing C∞-data can become
singular in finite time. Moreover, we derive detailed information about the
behaviors of solutions when the singularity occurs. In particular, this information
tells that singularity formation from some initial data is not because
c touches zero (which makes log c diverge) but due to the blowup of C1×C2-
norm of (ρ, c). As a corollary, we also construct initial data near any constant
equilibrium state which blows up in finite time for any d ≥ 1. Our results
are the extension of finite-time blow-up results in [9], where initial data is
required to satisfy some vanishing conditions. Furthermore, we interpret our
results in a way that some kinds of damping or dissipation of ρ are necessarily
required to ensure the global existence of smooth solutions even though
initial data are small perturbations around constant equilibrium states.
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dc.description.abstract이 논문은 Rd (d ≥ 1)에서 다음과 같은 로그 민감로를 갖는 쌍곡 Keller-Segel
소비 유형 시스템에 대해 다룬다.
∂tρ = −χ∇ · (ρ∇log c) , ∂tc = −μcρ (χ, μ > 0)
우리는 먼저 영이 아닌 매끄러운 초기 데이터에 해당하는 매끄러운 해의 국
소적 존재성을 보인다. 다음으로 리만 불변량을 통해 d = 1 일 때 유한 시간
특이점 형성을 위한 초기 데이터의 몇 가지 조건을 제시한다. 그런 다음 모든
d ≥ 1에 대해 일부 영이 아닌 C∞ 데이터가 유한한 시간 내에 폭발할 수 있음을
증명한다. 따름정리로, 우리는 모든 d ≥ 1에 대해 유한한 시간 내에 폭발하는
모든 상수 평형 상태 근처에 초기 데이터를 건설한다.
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dc.description.tableofcontentsAbstract i
1 Introduction 1
1.1 Previous works 2
1.2 Main results and Discussion 4
2 Local well-posedness 10
2.1 A priori estimates 10
2.2 Existence and Uniqueness 16
3 Sufficient conditions of data for finite-time blow-up in R 18
4 Finite-time blow-up in Rd 26
Bibliography 33
Abstract (in Korean) 37
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dc.format.extentii, 37-
dc.language.isoeng-
dc.publisher서울대학교 대학원-
dc.subjectKeller-Segel-
dc.subject.ddc510-
dc.titleFinite-time blow-up to hyperbolic Keller-Segel system of consumption type with logarithmic sensitivity-
dc.title.alternative로그 민감도를 갖는 쌍곡 Keller-Segel 소비 유형 시스템에 대한 유한 시간 폭발-
dc.typeThesis-
dc.typeDissertation-
dc.contributor.AlternativeAuthorJungkyoung Na-
dc.contributor.department자연과학대학 수리과학부-
dc.description.degree석사-
dc.date.awarded2023-08-
dc.identifier.uciI804:11032-000000177574-
dc.identifier.holdings000000000050▲000000000058▲000000177574▲-
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