Results 61 to 70 of about 29,467 (233)
On M-theory fourfold vacua with higher curvature terms
Physics Letters B, 2015 We study solutions to the eleven-dimensional supergravity action, including terms quartic and cubic in the Riemann curvature, that admit an eight-dimensional compact space.
Thomas W. Grimm +2 more
doaj +1 more source
The K\"ahler-Ricci flow, Ricci-flat metrics and collapsing limits
, 2017 We investigate the Kahler-Ricci flow on holomorphic fiber spaces whose generic fiber is a Calabi-Yau manifold. We establish uniform metric convergence to a metric on the base, away from the singular fibers, and show that the rescaled metrics on the ...
Tosatti, Valentino +2 more
core +1 more source
On invariance and Ricci-flatness of Hermitian metrics on open manifolds
Commentarii Mathematici Helvetici, 2006 We discuss a technique to construct Ricci-flat hermitian metrics on complements of (some) anticanonical divisors of almost homogeneous complex manifolds and inquire into when this metric is complete and Kähler. This construction has a strong interplay with invariance groups of the same dimension as the manifold acting with an open orbit.
Bert Koehler, Marco Kühnel
openalex +4 more sources
Advanced Intelligent Systems, EarlyView.Four decades of retinal vessel segmentation research (1982–2025) are synthesized, spanning classical image processing, machine learning, and deep learning paradigms. A meta‐analysis of 428 studies establishes a unified taxonomy and highlights performance trends, generalization capabilities, and clinical relevance.
Avinash Bansal +6 more
wiley +1 more source
A Kummer construction for Chern–Ricci flat balanced manifolds
Mathematische ZeitschriftAbstractGiven a non-Kähler Calabi–Yau compact orbifold with isolated singularities endowed with a Chern–Ricci flat balanced metric, we study, via a gluing construction, the existence of Chern–Ricci flat balanced metrics on its crepant resolutions, and discuss applications to the search of solutions for the Hull–Strominger system.
Giusti, Federico +1 more
openaire +6 more sources
Towards a Geometrization of Renormalization Group Histories in Asymptotic Safety
Universe, 2021 Considering the scale-dependent effective spacetimes implied by the functional renormalization group in d-dimensional quantum Einstein gravity, we discuss the representation of entire evolution histories by means of a single, (d+1)-dimensional manifold ...
Renata Ferrero, Martin Reuter
doaj +1 more source
Construction of Ricci-type connections by reduction and induction [PDF]
, 2003 Given the Euclidean space $\R^{2n+2}$ endowed with a constant symplectic structure and the standard flat connection, and given a polynomial of degree 2 on that space, Baguis and Cahen have defined a reduction procedure which yields a symplectic manifold ...
Cahen, Michel +2 more
core
Lymphatic Abnormalities in Noonan Syndrome Extend Beyond Clinically Apparent Disease
American Journal of Medical Genetics Part A, EarlyView.ABSTRACT Lymphatic disease represents a well‐described manifestation of Noonan syndrome (NS), yet the full phenotypic spectrum remains incompletely characterized, especially in asymptomatic individuals. We conducted a cross‐sectional study including 10 individuals with NS (four with peripheral lymphedema and six without) and 10 age‐ and sex‐matched ...
Inger Norlyk Sheyanth +7 more
wiley +1 more source
The quantum non-linear σ-model RG flow and integrability in wormhole geometries
Nuclear Physics B, 2023 The target space of the non-linear σ-model is a Riemannian manifold. Although it can be any Riemannian metric, there are certain physically interesting geometries which are worth to study.
Oscar Lasso Andino +1 more
doaj +1 more source
Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic
Communications on Pure and Applied Mathematics, EarlyView.ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
wiley +1 more source