当前期刊: Communications in Analysis and Geometry Go to current issue    加入关注   
显示样式:        排序: IF: - GO 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Bipyramid decompositions of multicrossing link complements
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Colin Adams; Gregory Kehne

    Generalizing previous constructions, we present a dual pair of decompositions of the complement of a link $L$ into bipyramids, given any multicrossing projection of $L$. When $L$ is hyperbolic, this gives new upper bounds on the volume of $L$ given its multicrossing projection. These bounds are realized by three closely related infinite tiling weaves.

    更新日期:2020-07-20
  • Gronwall’s conjecture for $3$-webs with infinitesimal symmetries
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Sergey I. Agafonov

    We study non-flat planar 3‑webs with infinitesimal symmetries. Using multi-dimensional Schwarzian derivative we give a criterion for linearization of such webs and present a projective classification thereof. Using this classification we show that the Gronwall conjecture is true for 3‑webs admitting infinitesimal symmetries.

    更新日期:2020-07-20
  • Remarks on complete noncompact Einstein warped products
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    R. Batista; M. Ranieri; E. Ribeiro

    The purpose of this article is to investigate the structure of complete non-compact quasi-Einstein manifolds. We show that complete noncompact quasi-Einstein manifolds with $\lambda = 0$ are connected at infinity. In addition, we provide some conditions under which quasi-Einstein manifolds with $\lambda \lt 0$ are $f$-non-parabolic. In particular, we obtain estimates on volume growth of geodesic balls

    更新日期:2020-07-20
  • On Li–Yau gradient estimate for sum of squares of vector fields up to higher step
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Der-Chen Chang; Shu-Cheng Chang; Chien Lin

    In this paper, we generalize Cao–Yau’s gradient estimate for the sum of squares of vector fields up to higher step under assumption of the generalized curvature-dimension inequality. With its applications, by deriving a curvature-dimension inequality, we are able to obtain the Li–Yau gradient estimate for the CR heat equation in a closed pseudohermitian manifold of nonvanishing torsion tensors. As

    更新日期:2020-07-20
  • From Lagrangian to totally real geometry: coupled flows and calibrations
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Jason D. Lotay; Tommaso Pacini

    We show that the properties of Lagrangian mean curvature flow are a special case of a more general phenomenon, concerning couplings between geometric flows of the ambient space and of totally real submanifolds. Both flows are driven by ambient Ricci curvature or, in the non-Kähler case, by its analogues. To this end we explore the geometry of totally real submanifolds, defining (i) a new geometric

    更新日期:2020-07-20
  • Existence results for some problems on Riemannian manifolds
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Giovanni Molica Bisci; Dušan Repovš; Luca Vilasi

    By using variational techniques we provide new existence results for Yamabe-type equations with subcritical perturbations set on a compact $d$-dimensional $(d \geq 3)$ Riemannian manifold without boundary. As a direct consequence of our main theorems, we prove the existence of at least one solution to the following Yamabe-type problem\[\begin{cases}-\Delta_g w + \alpha(\sigma) w = \mu K(\sigma) w^{\frac{d+2}{d-2}}

    更新日期:2020-07-20
  • Some integral curvature estimates for the Ricci flow in four dimensions
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Miles Simon

    We consider solutions $(M^4 , g(t)), 0 \leq t \lt T$, to Ricci flow on compact, four-dimensional manifolds without boundary. We prove integral curvature estimates which are valid for any such solution. In the case that the scalar curvature is bounded and $T \lt \infty$, we show that these estimates imply that the (spatial) integral of the square of the norm of the Riemannian curvature is bounded by

    更新日期:2020-07-20
  • A gap theorem of four-dimensional gradient shrinking solitons
    Commun. Anal. Geom. (IF 0.62) Pub Date : 
    Zhuhong Zhang

    In this paper, we will prove a gap theorem on four-dimensional gradient shrinking soliton. More precisely, we will show that any complete four-dimensional gradient shrinking soliton with nonnegative and bounded Ricci curvature, satisfying a pinched Weyl curvature, either is flat, or $\lambda_1 + \lambda_2 \geq c_0 R \gt 0$ at all points, where $c_0 \approx 0.29167$ and $\lbrace \lambda_i \rbrace$ are

    更新日期:2020-07-20
Contents have been reproduced by permission of the publishers.
导出
全部期刊列表>>
欢迎访问IOP中国网站
自然职场线上招聘会
GIANT
产业、创新与基础设施
自然科研线上培训服务
材料学研究精选
胸腔和胸部成像专题
屿渡论文,编辑服务
何川
苏昭铭
陈刚
姜涛
李闯创
李刚
北大
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
ACS材料视界
天合科研
x-mol收录
上海纽约大学
张健
陈芬儿
厦门大学
史大永
吉林大学
卓春祥
张昊
杨中悦
试剂库存
down
wechat
bug