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We prove that the ACC conjecture for minimal log discrepancies holds for threefolds in $[1-\delta,+\infty)$, where $\delta>0$ only depends on the coefficient set. We also study Reid's general elephant for pairs, and show Shokurov's…

Algebraic Geometry · Mathematics 2022-02-16 Jingjun Han , Jihao Liu , Yujie Luo

Recent study in K-stability suggests that klt singularities whose local volumes are bounded away from zero should be bounded up to special degeneration. We show that this is true in dimension three, or when the minimal log discrepancies of…

Algebraic Geometry · Mathematics 2023-06-02 Ziquan Zhuang

The purpose of this article is to give an overview of the construction of moduli spaces of curves from the viewpoint of the log minimal model program for M_g by providing an update of recent developments and discussing future problems. This…

Algebraic Geometry · Mathematics 2011-09-13 Jarod Alper , Donghoon Hyeon

The purpose of this paper is applying minimality of hyperplane arrangements to local system cohomology groups. It is well known that twisted cohomology groups with coefficients in a generic rank one local system vanish except in the top…

Algebraic Geometry · Mathematics 2011-05-18 Masahiko Yoshinaga

We study the stability of unitary quantum dynamics of composite systems (for example: central system + environment) with respect to weak interaction between the two parts. Unified theoretical formalism is applied to study different physical…

Quantum Physics · Physics 2009-11-07 Marko Znidaric , Tomaz Prosen

Hassett and Keel predicted that there is a descending sequence of critical $\alpha$ values where the log canonical model for the moduli space of stable curves with respect to $\alpha \delta$ changes. We derive a conjectural formula for the…

Algebraic Geometry · Mathematics 2011-03-30 Donghoon Hyeon

In this paper we prove the existence of purely log terminal blow-up for Kawamata log terminal singularity and obtain the criterion for a singularity to be weakly exceptional in terms of the exceptional divisor of plt blow-up.

Algebraic Geometry · Mathematics 2007-05-23 S. A. Kudryavtsev

Fujino and Tanaka established the minimal model theory for $\mathbb Q$-factorial log surfaces in characteristic $0$ and $p$, respectively. We prove that every intermediate surface has only log terminal singularities if we run the minimal…

Algebraic Geometry · Mathematics 2019-02-19 Haidong Liu

This is the first of a series of papers studying real algebraic threefolds using the minimal model program. The main results are outlined in Part II. The present part I. contains the necessary preliminary work concerning terminal…

alg-geom · Mathematics 2007-05-23 János Kollár

We investigate exactly solvable two-dimensional conformal field theories that exist at generic values of the central charge, and that interpolate between A-series or D-series minimal models. When the central charge becomes rational,…

High Energy Physics - Theory · Physics 2019-06-26 Sylvain Ribault

A recurring difficulty in the Minimal Model Program is that while log terminal singularities are quite well behaved (for instance, they are rational), log canonical singularities are much more complicated; they need not even be…

Algebraic Geometry · Mathematics 2015-05-13 János Kollár , Sándor J Kovács

We establish the relative minimal model program with scaling for locally projective morphisms of quasi-excellent algebraic spaces admitting dualizing complexes, quasi-excellent formal schemes admitting dualizing complexes, semianalytic…

Algebraic Geometry · Mathematics 2026-02-13 Shiji Lyu , Takumi Murayama

We prove that a Kawamata log terminal pair has the canonical model.

Algebraic Geometry · Mathematics 2020-04-09 Zhengyu Hu

This semi-expository paper discusses the log minimal model program as applied to the moduli space of curves, especially in the case of curves of genus two. Log canonical models for these moduli spaces can often be constructed using the…

Algebraic Geometry · Mathematics 2007-05-23 Brendan Hassett

We introduce a class of singular log schemes in three dimensions and conjecture that log schemes in this class admit log crepant log resolutions. We provide examples as evidence and relate this conjecture to the conjecture made in [4] and…

Algebraic Geometry · Mathematics 2025-03-17 Alessio Corti , Tim Graefnitz , Helge Ruddat

Under the assumption of the minimal model theory for projective klt pairs of dimension $n$, we establish the minimal model theory for lc pairs $(X/Z,\Delta)$ such that the log canonical divisor is relatively log abundant and its restriction…

Algebraic Geometry · Mathematics 2019-08-29 Kenta Hashizume , Zhengyu Hu

In this work we study the local coupled Kuramoto model with periodic boundary conditions. Our main objective is to show how analytical solutions may be obtained from symmetry assumptions, and while we proceed on our endeavor we show apart…

Adaptation and Self-Organizing Systems · Physics 2013-02-13 Paulo F. C. Tilles , Hilda A. Cerdeira , Fernando F. Ferreira

The unitary $N = 2$ superconformal minimal models have a long history in string theory and mathematical physics, while their non-unitary (and logarithmic) cousins have recently attracted interest from mathematicians. Here, we give an…

Mathematical Physics · Physics 2019-06-26 Thomas Creutzig , Tianshu Liu , David Ridout , Simon Wood

We discuss the birational geometry of singular surfaces in positive characteristic. More precisely, we establish the minimal model program and the abundance theorem for Q-factorial surfaces and for log canonical surfaces. Moreover, in the…

Algebraic Geometry · Mathematics 2015-03-17 Hiromu Tanaka

We survey some recent development in the stability theory of klt singularities. The main focus is on the solution of the stable degeneration conjecture.

Algebraic Geometry · Mathematics 2023-07-21 Ziquan Zhuang