Singularities with 𝔾 m -action and\break the log minimal model program for ℳ¯ g

2016 ◽  
Vol 2016 (721) ◽  
pp. 1-41 ◽  
Author(s):  
Jarod Alper ◽  
Maksym Fedorchuk ◽  
David Ishii Smyth
Keyword(s):  
Minimal Model ◽  
Model Program ◽  
Minimal Model Program ◽  
Canonical Models ◽  
Precise Formulation ◽  
Log Canonical ◽  
Log Minimal Model Program

AbstractWe give a precise formulation of the modularity principle for the log canonical models

THE LMMP FOR LOG CANONICAL 3-FOLDS IN CHARACTERISTIC

2017 ◽  
Vol 230 ◽  
pp. 48-71 ◽  
Author(s):  
JOE WALDRON
Keyword(s):  
Minimal Model ◽  
Effective Divisor ◽  
Model Program ◽  
Minimal Models ◽  
Minimal Model Program ◽  
Log Canonical ◽  
Contraction Theorem ◽  
Log Minimal Model Program

We prove that one can run the log minimal model program for log canonical 3-fold pairs in characteristic $p>5$. In particular, we prove the cone theorem, contraction theorem, the existence of flips and the existence of log minimal models for pairs with log divisor numerically equivalent to an effective divisor. These follow from our main results, which are that certain log minimal models are good.

scholarly journals ON THE FIRST STEPS OF THE MINIMAL MODEL PROGRAM FOR THE MODULI SPACE OF STABLE POINTED CURVES

2021 ◽  
pp. 1-67
Author(s):  
Giulio Codogni ◽  
Luca Tasin ◽  
Filippo Viviani
Keyword(s):  
Moduli Space ◽  
Minimal Model ◽  
Model Program ◽  
Minimal Model Program ◽  
Geometric Properties ◽  
Canonical Models ◽  
Log Canonical

Abstract The aim of this paper is to study all the natural first steps of the minimal model program for the moduli space of stable pointed curves. We prove that they admit a modular interpretation, and we study their geometric properties. As a particular case, we recover the first few Hassett–Keel log canonical models. As a by-product, we produce many birational morphisms from the moduli space of stable pointed curves to alternative modular projective compactifications of the moduli space of pointed curves.

scholarly journals Modular compactifications of the space of pointed elliptic curves II

2011 ◽  
Vol 147 (6) ◽  
pp. 1843-1884 ◽  
Author(s):  
David Ishii Smyth
Keyword(s):  
Elliptic Curves ◽  
Moduli Spaces ◽  
Minimal Model ◽  
Model Program ◽  
Minimal Model Program ◽  
Stable Curves ◽  
Log Minimal Model Program

AbstractWe prove that the moduli spaces of n-pointed m-stable curves introduced in our previous paper have projective coarse moduli. We use the resulting spaces to run an analogue of Hassett’s log minimal model program for $\overline {M}_{1,n}$.

scholarly journals Minimal Models and Abundance for Positive Characteristic Log Surfaces

2014 ◽  
Vol 216 ◽  
pp. 1-70 ◽  
Author(s):  
Hiromu Tanaka
Keyword(s):  
Finite Field ◽  
Minimal Model ◽  
Positive Characteristic ◽  
Algebraic Closure ◽  
Model Program ◽  
Minimal Models ◽  
Base Field ◽  
Singular Surfaces ◽  
Minimal Model Program ◽  
Log Canonical

AbstractWe 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 case where the base field is the algebraic closure of a finite field, we obtain the same results under much weaker assumptions.

scholarly journals On existence of log minimal models

2010 ◽  
Vol 146 (4) ◽  
pp. 919-928 ◽  
Author(s):  
Caucher Birkar
Keyword(s):  
Minimal Model ◽  
Kodaira Dimension ◽  
Reduction Theorem ◽  
Model Program ◽  
Minimal Models ◽  
Minimal Model Program ◽  
Log Minimal Model Program ◽  
Negative Kodaira Dimension

AbstractIn this paper, we prove that the log minimal model program in dimension d−1 implies the existence of log minimal models for effective lc pairs (e.g. of non-negative Kodaira dimension) in dimension d. In fact, we prove that the same conclusion follows from a weaker assumption, namely, the log minimal model program with scaling in dimension d−1. This enables us to prove that effective lc pairs in dimension five have log minimal models. We also give new proofs of the existence of log minimal models for effective lc pairs in dimension four and of the Shokurov reduction theorem.

scholarly journals Smooth projective horospherical varieties of Picard group $\mathbb{Z}^2$

2020 ◽  
Vol Volume 4 ◽  
Author(s):  
Boris Pasquier
Keyword(s):  
Minimal Model ◽  
Picard Group ◽  
Model Program ◽  
Minimal Model Program ◽  
Log Minimal Model Program ◽  
International Audience

International audience We classify all smooth projective horospherical varieties of Picard group $\mathbb{Z}^2$ and we give a first description of their geometry via the Log Minimal Model Program.

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