Results 71 to 80 of about 406,237 (253)

An axially symmetric spacetime with causality violation in Ricci-inverse gravity

open access: yesEuropean Physical Journal C: Particles and Fields, 2023
In this paper, Ricci-inverse gravity is investigated. It is an alternative theory of gravity that introduces into the Einstein–Hilbert action an anti-curvature scalar that is obtained from the anti-curvature tensor which is the inverse of the Ricci ...
J. C. R. de Souza, A. F. Santos
doaj   +1 more source

Kropina Metrics with Isotropic Scalar Curvature

open access: yesAxioms, 2023
In this paper, we study Kropina metrics with isotropic scalar curvature. First, we obtain the expressions of Ricci curvature tensor and scalar curvature. Then, we characterize the Kropina metrics with isotropic scalar curvature on by tensor analysis.
Liulin Liu, Xiaoling Zhang, Lili Zhao
doaj   +1 more source

Rigidity of Complete Gradient Shrinkers with Pointwise Pinching Riemannian Curvature

open access: yesAdvances in Mathematical Physics, 2021
Let Mn,g,f be a complete gradient shrinking Ricci soliton of dimension n≥3. In this paper, we study the rigidity of Mn,g,f with pointwise pinching curvature and obtain some rigidity results.
Yawei Chu, Dehe Li, Jundong Zhou
doaj   +1 more source

Long‐Term Outcome of Fanconi Anemia Patients From the Italian Registry on Behalf of the Marrow Failure Study Group of the AIEOP (Italian Association for Pediatric Haematology‐Oncology)

open access: yesAmerican Journal of Hematology, EarlyView.
ABSTRACT We analyzed 193 Fanconi anemia patients from the Italian Registry, focusing on hematological outcome, cancer risk, and mortality, both in transplanted (n = 130, 67.4% of the cohort) and non‐transplanted (n = 63, 36.6% of the cohort) patients. After a median follow‐up of 7 years, almost all patients developed cytopenia that was more frequent in
Erica Ricci   +35 more
wiley   +1 more source

Ricci Curvature Inequalities for Skew CR-Warped Product Submanifolds in Complex Space Forms

open access: yesMathematics, 2020
The fundamental goal of this study was to achieve the Ricci curvature inequalities for a skew CR-warped product (SCR W-P) submanifold isometrically immersed in a complex space form (CSF) in the expressions of the squared norm of mean curvature vector and
Meraj Ali Khan, Ibrahim Aldayel
doaj   +1 more source

Conformal η-Ricci solitons within the framework of indefinite Kenmotsu manifolds

open access: yesAIMS Mathematics, 2022
The present paper is to deliberate the class of ϵ-Kenmotsu manifolds which admits conformal η-Ricci soliton. Here, we study some special types of Ricci tensor in connection with the conformal η-Ricci soliton of ϵ-Kenmotsu manifolds.
Yanlin Li   +3 more
doaj   +1 more source

Characterizations of Bounded Ricci Curvature on Smooth and NonSmooth Spaces [PDF]

open access: yes, 2015
There are two primary goals to this paper. In the first part of the paper we study smooth metric measure spaces (M^n,g,e^{-f}dv_g) and give several ways of characterizing bounds -Kg\leq \Ric+\nabla^2f\leq Kg on the Ricci curvature of the manifold.
Naber, Aaron
core  

Axion‐Like Interactions and CFT in Topological Matter, Anomaly Sum Rules and the Faraday Effect

open access: yesAdvanced Physics Research, EarlyView.
This review investigates the connection between chiral anomalies and their manifestation in topological materials, using both perturbative methods based on ordinary quantum field theory and conformal field theory (CFT). It emphasizes the role of CFT in momentum space for parity‐odd correlation functions, and their reconstruction by the inclusion of a ...
Claudio Corianò   +4 more
wiley   +1 more source

Some rigidity results for noncompact gradient steady Ricci solitons and Ricci-flat manifolds [PDF]

open access: yes, 2016
Gradient steady Ricci solitons are natural generalizations of Ricci-flat manifolds. In this article, we prove a curvature gap theorem for gradient steady Ricci solitons with nonconstant potential functions; and a curvature gap theorem for Ricci-flat ...
He, Fei
core  

L2 curvature bounds on manifolds with bounded Ricci curvature [PDF]

open access: yesAnnals of Mathematics, 2016
Consider a Riemannian manifold with bounded Ricci curvature $|\Ric|\leq n-1$ and the noncollapsing lower volume bound $\Vol(B_1(p))>\rv>0$. The first main result of this paper is to prove that we have the $L^2$ curvature bound $\fint_{B_1(p)}|\Rm|^2 < C ...
Wenshuai Jiang, A. Naber
semanticscholar   +1 more source

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