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In complex dimensions $\geq 3$, we provide a geometric existence for generalized ALG complete non-compact Ricci flat K\"ahler manifolds with Schwartz decay i.e. metric decay in any polynomial rate to an ALG model $\mathbb{C}\times Y$ modulo finite cyclic group action, where $Y$ is Calabi-Yau. Consequently, for any $K3$ surface with a purely non-symplectic automorphism $\sigma$ of finite order, a K\"ahler crepant resolution of the orbifold $\frac{\mathbb{C} \times K3}{\langle \sigma \rangle}$ admits ALG Ricci-flat K\"ahler metrics with Schwartz decay. It is known that K\"ahler crepant resolution exists in our case. Hence there are $39$ integers, such that $2\pi$ divided by each of them is the asymptotic angle of an ALG Ricci-flat K\"ahler $3-$fold with Schwartz decay. We also exhibit a 1638 parameters family of ALG Ricci-flat K\"ahler $3-$folds with asymptotic angle $\pi$ that realize $64$ distinct triples of Betti numbers. They are iso-trivially fibred by $K3$ surface with a non-symplectic Nikulin involution. A simple version of local Kunneth formula for $H^{1,1}$/local $i\partial\overline{\partial}-$lemma plays a role in both the Schwartz decay, and the construction of ansatz that equals a Ricci flat ALG model outside a compact set (isotrivial ansatz). The proof of Schwartz decay relies on a non-concentration of the Newtonian potential, and can not be immediately generalized to fibration with higher dimensional base, due to existence of concentrating sequence of $L^{2}$ normalized eigen-functions on unit round spheres of (real) dimension $\geq 2$., Comment: 47 pages. 5 figures, 3 tables. Revisions are carried out and presentation improved. Inaccuracy in Proposition 1.6 is fixed: k^2_{0} is the eigen-value, not k_{0}. Definition of weakly distinct is revised. Typos are corrected. Comments are welcome

Using techniques for Caccioppoli inequality, on a fairly general class of complete non-compact K\"ahler manifolds with sub-quadratic volume growth, we show uniqueness of bounded $C^{1,1}$ solution to Monge-Ampere equation. This does not a priori require any decay of the solution., Comment: References are added. Presentation is improved. The proof of Corollary 1.3 SOB(2)-case is revised. More explanations are added. 8 pages

When the rank of the bundle is $\geq 2$, in a certain sense, we found an essential obstruction for the gluing construction of $G_{2}-$instantons with $1-$dimensional singularities. It involves the Atiyah classes generated by contracting a vector in $\mathbb{C}^{3}$ with the curvature. Intuitively speaking, the gluing does not work if the tangent connection at a component of the $1-$dimensional singular locus is not the twisted Fubini-Study connection on a twisted tangent bundle of $\mathbb{P}^{2}$. Particularly, it fails if the rank of the bundle is $\geq 3$., Comment: 23 pages. Comments are welcome

This is the first step in an attempt at a deformation theory for $G_{2}-$instantons with $1-$dimensional conic singularities. Under a set of model data, the linearization yields a self-adjoint first order elliptic operator $P$ on a certain bundle over $\mathbb{S}^{5}$. As a dimension reduction, the operator $P$ also arises from Hermitian Yang-Mills connections with isolated conic singularities on a Calabi-Yau $3$-fold. Using the Quaternion structure in the Sasakian geometry of $\mathbb{S}^{5}$, we describe the set of all eigenvalues of $P$ (denoted by $Spec P$). We show that $SpecP$ consists of finitely many integers induced by certain sheaf cohomologies on $\mathbb{P}^{2}$, and infinitely many real numbers induced by the spectrum of the rough Laplacian on the pullback endomorphism bundle over $\mathbb{S}^{5}$. The multiplicities and the form of an eigensection can be described fairly explicitly. Using the representation theory of $SU(3)$ and the subgroup $S[U(1)\times U(2)]$, we show an example in which $SpecP$ and the multiplicities can be completely determined., Comment: Some typos corrected. Still 70 pages. Comments are welcome

Let $X$ be a closed $6-$dimensional manifold with a half-closed $SU(3)-$structure. On the product manifold $X\times S^{1}$, with respect to the product $G_{2}-$structure and on a pullback vector bundle from $X$, we show that any $G_{2}-$instanton is equivalent to a Hermitian Yang-Mills connection on $X$ via a "broken gauge". This result reveals the topological type of the moduli of $G_{2}-$instantons on $X\times S^{1}$. In dimension $8$, similar result holds for moduli of $Spin(7)-$instantons. A generalization and an example are given., Comment: 23 pages, 1 figure. Improved presentation. Final version to appear in Annales Henri Poincar\'e

We prove the hypersymplectic flow of simple type on standard torus $\mathbb{T}^4$ exists for all time and converges to the standard flat structure modulo diffeomorphisms. This result in particular gives the first example of a cohomogeneity-one $G_2$-Laplacian flow on a compact $7$-manifold which exists for all time and converges to a torsion-free $G_2$ structure modulo diffeomorphisms., Comment: v2, typos corrected, version appeared in the Journal of the London Mathematical Society

Given an elliptic operator $P$ on a non-compact manifold (with proper asymptotic conditions), there is a discrete set of numbers called indicial roots. It's known that $P$ is Fredholm between weighted Sobolev spaces if and only if the weight is not indicial. We show that an elliptic theory exists even when the weight is indicial. We also discuss some simple applications to Yang-Mills theory and minimal surfaces., Comment: 16 pages, no figure. Comments are welcome

This is a note on \cite{LSU} and \cite{FS}. Using their work line by line, we prove the H\"older-continuity of solutions to linear parabolic equations of mixed type, assuming the coefficient of $\frac{\partial}{\partial t}$ has time-derivative bounded from above. On a K\"ahler manifold, this H\"older estimate works when the metrics possess conic singularities along a normal crossing divisor., Comment: 16 pages, no figure, comments are welcome

For any locally defined $G_{2}-$structure and Hermitian-Yang-Mills connection on $S^{6}$, the $G_{2}-$monopole equation always admits a local solution that is asymptotic to the HYM-connection., Comment: 4 pages. Comments are welcome

In dimension 7, we establish a Fredholm theory for a Dirac-type operator associated to a connection with point singularities. There are two applications. $1$. over a closed 7-manifold, under some natural conditions, a $G_{2}-$instanton and its point singularities can still be "seen" when the $G_{2}-$structure is properly perturbed. $2$. over a ball in $\R^{7}$, for any almost-Euclidean $G_{2}-$structure, there exists a $G_{2}-$monopole asymptotic to an arbitrary Hermitian Yang-Mills connection on $S^{6}$., Comment: 60 pages. Minor change from v1: References added and mentioned. Definition 2.14 added. Some change in page 41 on the proof of Thm 1.13. Two typos are corrected. Nothing else is touched

We present a somewhat new proof to the $C^{2,\alpha}$-aprori estimate for the uniform elliptic Monge-Ampere equations, in both the real and complex settings. Our estimates do not need to differentiate the equation, and only depends on the $C^{\alpha^{\prime}}-$norm of the right hand side of the equation, $0<\alpha<\alpha^{\prime}$., Comment: 14 pages, comments are welcome

In the category of metrics with conical singularities along a smooth divisor with angle in $(0, 2\pi)$, we show that locally defined weak solutions ($C^{1,1}-$solutions) to the K\"ahler-Einstein equations actually possess maximum regularity, which means the metrics are actually H\"older continuous in the singular polar coordinates. This shows the weak K\"ahler-Einstein metrics constructed by Guenancia-Paun \cite{GP}, and independently by Yao \cite{GT}, are all actually strong-conical K\"ahler-Einstein metrics. The key step is to establish a Liouville-type theorem for weak-conical K\"ahler-Ricci flat metrics defined over $\C^{n}$, which depends on a Calderon-Zygmund theory in the conical setting., Comment: 32 pages, comments are welcome

We prove that the conical K\"ahler-Ricci flows introduced in \cite{CYW} exist for all time $t\in [0,+\infty)$. These immortal flows possess maximal regularity in the conical category. As an application, we show if the twisted first Chern class $C_{1,\beta}$ is negative or zero, the corresponding conical K\"ahler-Ricci flows converge to K\"ahler-Einstein metrics with conical singularities exponentially fast. To establish these results, one of our key steps is to prove a Liouville type theorem for K\"ahler-Ricci flat metrics (which are defined over $\mathbb{C}^{n}$) with conical singularities., Comment: 50 pages. Comments are welcome

In this note, we show that the conical K\"ahler-Ricci flows introduced in \cite{CYW} exist for all time $t\in [0,\infty)$ in the weak sense. As a key ingredient of the proof, we show that a conical K\"ahler-Ricci flow is actually the limit of a sequence of smooth K\"ahler-Ricci flows., Comment: Reference updated especially on Bahuaud-Vertman's work on Yamabe flow, Mathematische Annalen. First online: 01 August 2015

In this short note, we show that given a special K\"ahler-Einstein degeneration with bounded geometry, for any noncentral fiber, there exists a K\"ahler-Ricci flow which converges to the K\"ahler-Einstein metric of the central fiber. As an example, Tian's deformations \cite{Tian97} of the Mukai 3-fold admit K\"ahler-Ricci flows which converge to Donaldson's K\"ahler-Einstein metric \cite{Don08} over the Mukai 3-fold., Comment: 10 pages, comments are welcome

Following Donaldson's oppenness theorem on deforming a conical K\"ahler-Einstein metric, we prove a parabolic Schauder-type estimate with respect to conical metrics. As a corollary, we show that the conical K\"ahler-Ricci Flow exists for short time. The key is to establish the relevant heat kernel estimates, where we use the Weber's formula on Bessel function of the second kind and Carslaw's heat kernel representation in \cite{Car}., Comment: 82 pages, 2 figures, comments are welcome