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We give necessary and sufficient conditions for existence of solutions to a general system of complex Monge-Amp\`ere equations on Fano horosymmetric manifolds. In particular, we get necessary and sufficient conditions for existence of…

微分几何 · 数学 2022-05-09 Thibaut Delcroix , Jakob Hultgren

If $M$ is a projective manifold in $P^N$, then one can associate to each one parameter subgroup $H$ of $SL(N+1)$ the Mumford $\mu$ invariant. The manifold $M$ is Chow-Mumford stable if $\mu$ is positive for all $H$. Tian has defined the…

微分几何 · 数学 2007-05-23 D. H. Phong , Jacob Sturm

A short proof of the convergence of the Kahler-Ricci flow on Fano manifolds admitting a Kahler-Einstein metric or a Kahler-Ricci soliton is given, using a variety of recent techniques

微分几何 · 数学 2020-01-20 Bin Guo , Duong H. Phong , Jacob Sturm

In this paper we study the existence and regularity of stable manifolds associated to fixed points of parabolic type in the differentiable and analytic cases, using the parametrization method. The parametrization method relies on a suitable…

动力系统 · 数学 2016-03-09 Inmaculada Baldomá , Ernest Fontich , Pau Martín

We study the enumerativity of Gromov-Witten invariants where the domain curve is fixed in moduli and required to pass through the maximum possible number of points. We say a Fano manifold satisfies asymptotic enumerativity if such…

代数几何 · 数学 2024-12-04 Roya Beheshti , Brian Lehmann , Carl Lian , Eric Riedl , Jason Starr , Sho Tanimoto

We exhibit an example of obstructed K-polystable Fano 3-fold $X$ such that the K-moduli stack of K-semistable Fano varieties and the K-moduli space of K-polystable Fano varieties have an embedded point at $[X]$.

代数几何 · 数学 2025-04-03 Andrea Petracci

In this paper, a systematic study of Kenmotsu pseudo-metric manifolds are introduced. After studying the properties of this manifolds, we provide necessary and sufficient condition for Kenmotsu pseudo-metric manifold to have constant…

微分几何 · 数学 2019-12-25 Devaraja Mallesha Naik , Venkatesha , D. G. Prakasha

In this paper we prove that a regular foliation on a complex weak Fano manifold is algebraically integrable.

代数几何 · 数学 2015-10-19 Stéphane Druel

This paper generalizes the first author's preceding works concerning admissible functions on certain Fano manifolds. Here, we study a larger class of functions which can be less symmetric than the ones studied before. When the sup of these…

微分几何 · 数学 2010-06-09 Adnene Ben Abdesselem , Brahim Dridi

We prove finiteness of the number of smooth blow-downs on Fano manifolds and boundedness results for the geometry of non projective Fano-like manifolds. Our proofs use properness of Hilbert schemes and Mori theory.

代数几何 · 数学 2007-05-23 L. Bonavero , S. Takayama

For $\phi$ a metric on the anticanonical bundle, $-K_X$, of a Fano manifold $X$ we consider the volume of $X$ $$ \int_X e^{-\phi}. $$ We prove that the logarithm of the volume is concave along bounded geodesics in the space of positively…

微分几何 · 数学 2015-04-17 Bo Berndtsson

As a generalization of the Mukai conjecture, we conjecture that the Fano manifolds $X$ which satisfy the property $\rho_X(r_X-1)\geq\dim X-1$ have very special structure, where $\rho_X$ is the Picard number of $X$ and $r_X$ is the index of…

代数几何 · 数学 2015-04-03 Kento Fujita

We give a necessary and sufficient condition for a generalized Bott manifold to be Fano or weak Fano. As a consequence we characterize Fano Bott manifolds.

代数几何 · 数学 2018-11-16 Yusuke Suyama

We consider Fano manifolds admitting an algebraic torus action with general orbit of codimension one. Using a recent result of Datar and Szekelyhidi, we effectively determine the existence of Kahler-Ricci solitons for those manifolds via…

代数几何 · 数学 2022-05-20 Nathan Ilten , Hendrik Süß

We present an argument for proving the existence of local stable and unstable manifolds in a general abstract setting and under very weak hyperbolicity conditions.

动力系统 · 数学 2012-11-07 Mark Holland , Stefano Luzzatto

We study Fano manifolds $X$ admitting an unsplit dominating family of rational curves and we prove that the Generalized Mukai Conjecture holds if $X$ has pseudoindex $i_X = (\dim X)/3$ or dimension $\dim X=6$. We also show that this…

代数几何 · 数学 2011-12-25 Carla Novelli

The object of the present paper is to study some properties of (LCS)$_n$-manifolds whose metric is Yamabe soliton. We establish some characterization of (LCS)$_n$-manifolds when the soliton becomes steady. Next we have studied some certain…

微分几何 · 数学 2021-01-12 Soumendu Roy , Santu Dey , Arindam Bhattacharyya

The notion of acceptable bundles plays a fundamental role in the Simpson--Mochizuki theory. This paper presents a detailed study of acceptable bundles on a punctured disk. In addition to its expository aspects, we introduce a new invariant…

代数几何 · 数学 2026-04-09 Osamu Fujino , Taro Fujisawa , Takashi Ono

It is well known that a unit sphere admits Sasakian 3-structure. Also, Sasakian manifolds are locally isometric to a unit sphere under several curvature and critical conditions. So, a natural question is: Does there exist any curvature or…

微分几何 · 数学 2021-09-10 Dibakar Dey

We prove that an admissible manifold (as defined by Apostolov, Calderbank, Gauduchon and T{\o}nnesen-Friedman), arising from a base with a local K\"ahler product of constant scalar curvature metrics, admits Generalized Quasi-Einstein…

微分几何 · 数学 2009-09-08 Gideon Maschler , Christina W. Tønnesen-Friedman