전보광 교수
BoGwang Jeon
포항공과대학교 환경공학부 · 수학
연구실 소개
전보광 교수의 연구실은 고차원 기하학과 수론의 교차 분야에서 활동하며, 특히 3차원 하이퍼볼릭 다양체의 위상수학적 성질과 그에 연관된 대수적 구조, 예를 들어 추적 필드(trace field)와 히사부르트 대각선 대수(quaternion algebra)의 기하적 실현 가능성을 중심으로 연구합니다. 특히, 코스메틱 쌓기 추측(Cosmetic Surgery Conjecture)의 일반화와 제일버-핀크 추측, 레이머의 추측 등 수론적 가정 하에 기하학적 구조의 차수와 성질을 정량적으로 분석하는 데 초점을 맞추고 있습니다. 또한, 표면 위의 하이퍼볼릭 구조에서 실수 체와 히사부르트 대수의 기하적 실현 가능성을 보장하는 구성적 결과를 도출하며, 기하학적 대수적 구조의 분류 이론을 심화하고 있습니다.
연구 현황
연구 성과 추이
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
주요 논문
15In this paper, we generalize the Cosmetic Surgery Conjecture to an $n$-cusped hyperbolic $3$-manifold and prove it under the assumption of another well-known conjecture in number theory, so called the Zilber-Pink Conjecture. For $n=1$ and $2$, we show them without the assumption.
Update: The Cosmetic Surgery Conjecture modulo finitely many Dehn-filling coefficients has been a well-known classical result, so the first main result of this paper is not new. (But the author was initially unaware of this fact, and the tools and techniques used here are very different from all the classically known methods.) The second main result of the paper, that is, the generalized Cosmetic Surgery Conjecture for the 2-cusped case is new, but superseded by the author's later work.
Let $S_g$ ($g\geq 2$) be a closed surface of genus $g$. Let $K$ be any real number field, and let $A$ be any quaternion algebra over $K$ such that $A\otimes _K\mathbb {R}\cong M_2(\mathbb {R})$. We show that there exists a hyperbolic structure on $S_g$ such that $K$ and $A$ arise as its invariant trace field and invariant quaternion algebra.
Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="script upper M"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi class="MJX-tex-caligraphic" mathvariant="script">M</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">\mathcal {M}</mml:annotation> </mml:semantics> </mml:math> </inline-formula> be a <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="1
Assuming Lehmer's conjecture, we estimate the degree of the trace field $K(M_{p/q})$ of a hyperbolic Dehn-filling $M_{p/q}$ of a 1-cusped hyperbolic 3-manifold $M$ by $$ \dfrac{1}{C}(\max\;\{|p|,|q|\})\leq \text{deg }K(M_{p/q}) \leq C(\max\;\{|p|,|q|\}) $$ where $C=C_M$ is a constant that depends on $M$.
In this paper, we prove the Bounded Height Conjecture which the author formulated in [2]. As a corollary, it follows that there are only a finite number of hyperbolic three manifolds of bounded volume and trace field degree.
Abstract Assuming Lehmer's conjecture, we estimate the degree of the trace field of a hyperbolic Dehn filling of a 1‐cusped hyperbolic 3‐manifold by where is a constant that depends on .
Given a closed hyperbolic 3-manifold $M$, we construct a tower of covers with increasing Heegaard genus, and give an explicit lower bound on the Heegaard genus of such covers as a function of their degree. Using similar methods we prove that for any $ε>0$ there exist infinitely many congruence covers $\{M_i\}$ such that, for any $x \in M$, $M_i$ contains an embbeded ball $B_x$ (with center $x$) satisfying $\text{vol}(B_x) > (\text{vol}(M_i))^{\tfrac{1}{4}-ε}$. We get similar results in the
For a single cusped hyperbolic 3-manifold, Hodgson proved that there are only finitely many Dehn fillings of it whose trace fields have bounded degree. In this paper, we conjecture the same for manifolds with more cusps, and give the first positive results in this direction. For example, in the 2-cusped case, if a manifold has linearly independent cusp shapes, we show that the manifold has the desired property.To prove the results, we use the proof of the Bounded Height Conjecture in arithmetic
Let $M$ be an $n$-cusped hyperbolic $3$-manifold having rationally independent cusp shapes and $X$ be its holonomy variety. We first show that every maximal anomalous subvariety of $X$ containing the identity is its subvariety of codimension $1$ which arises by having a cusp of $M$ complete. Second, we prove if $X^{oa} =\emptyset$ , then $M$ has cusps which are, keeping some other cusps of it complete, strongly geometrically isolated from the rest. Third, we resolve the Zilber-Pink conjecture fo
Given a closed hyperbolic 3-manifold M, we construct a tower of covers with increasing Heegaard genus and give an explicit lower bound on the Heegaard genus of such covers as a function of their degree.Using similar methods, we prove that for any > 0 there exist infinitely many congruence covers {M i } such that, for any x ∈ M, M i contains an embedded ball B x (with center x) satisfying vol B x > (vol M i ) 1/4-.We get similar results for an arithmetic noncompact case.
Let $M$ be a $2$-cusped hyperbolic $3$-manifold. By the work of Thurston, the product of the derivatives of the holonomies of core geodesics of each Dehn filling of $M$ is an invariant of it. In this paper, we classify Dehn fillings of $M$ with sufficiently large coefficients using this invariant. Further, for any given two Dehn fillings of $M$ (with sufficiently larger coefficients), if their aforementioned invariants are the same, it is shown their complex volumes are the same as well.
Let $M$ be an $n$-cusped hyperbolic $3$-manifold having rationally independent cusp shapes and $X$ be its A-polynomial. We first show that every maximal anomalous subvariety of $X$ containing the identity is its subvariety of codimension $1$ which arises by having a cusp of $M$ complete. Second, we prove if $X^{oa} =\emptyset$ , then $M$ has cusps which are, keeping some other cusps of it complete, strongly geometrically isolated from the rest. Third, we resolve the Zilber-Pink conjecture for A-
Let $S_g$ ($g\geq 2$) be a closed surface of genus $g$. Let $K$ be any real number field and $A$ be any quaternion algebra over $K$ such that $A\otimes_K\mathbb{R}\cong M_2(\mathbb{R})$. We show that there exists a hyperbolic structure on $S_g$ such that $K$ and $A$ arise as its invariant trace field and invariant quaternion algebra.
Abstract Let be a 2‐cusped hyperbolic 3‐manifold. By the work of Thurston, the product of the derivatives of the holonomies of core geodesics of each Dehn filling of is an invariant of it. In this paper, we classify Dehn fillings of with sufficiently large coefficients using this invariant. Further, for any given two Dehn fillings of (with sufficiently larger coefficients), if their aforementioned invariants are the same, it is shown their complex volumes are the same as well.
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