scholarly journals A NEW QUANTITY IN RIEMANN-FINSLER GEOMETRY

2012 ◽  
Vol 54 (3) ◽  
pp. 637-645 ◽  
Author(s):  
XIAOHUAN MO ◽  
ZHONGMIN SHEN ◽  
HUAIFU LIU
Keyword(s):  
Scalar Curvature ◽  
Simple Proof ◽  
Finsler Geometry ◽  
Finsler Manifold ◽  
Flag Curvature ◽  
Finsler Metric ◽  
Finsler Metrics ◽  
Riemannian Curvature

AbstractIn this note, we study a new Finslerian quantity Ĉ defined by the Riemannian curvature. We prove that the new Finslerian quantity is a non-Riemannian quantity for a Finsler manifold with dimension n = 3. Then we study Finsler metrics of scalar curvature. We find that the Ĉ-curvature is closely related to the flag curvature and the H-curvature. We show that Ĉ-curvature gives, a measure of the failure of a Finsler metric to be of weakly isotropic flag curvature. We also give a simple proof of the Najafi-Shen-Tayebi' theorem.

On generalized 4-th root metrics of isotropic scalar curvature

2018 ◽  
Vol 68 (4) ◽  
pp. 907-928 ◽  
Author(s):  
Akbar Tayebi
Keyword(s):  
Scalar Curvature ◽  
Finsler Geometry ◽  
Finsler Metric ◽  
Finsler Metrics ◽  
Sufficient Condition ◽  
Riemannian Curvature ◽  
Necessary And Sufficient Condition ◽  
Conformal Change ◽  
Riemannian Curvature Tensor ◽  
Necessary And Sufficient

AbstractBy an interesting physical perspective and a suitable contraction of the Riemannian curvature tensor in Finsler geometry, Akbar-Zadeh introduced the notion of scalar curvature for the Finsler metrics. A Finsler metric is called of isotropic scalar curvature if the scalar curvature depends on the position only. In this paper, we study the class of generalized 4-th root metrics. These metrics generalize 4-th root metrics which are used in Biology as ecological metrics. We find the necessary and sufficient condition under which a generalized 4-th root metric is of isotropic scalar curvature. Then, we find the necessary and sufficient condition under which the conformal change of a generalized 4-th root metric is of isotropic scalar curvature. Finally, we characterize the Bryant metrics of isotropic scalar curvature.

ON A CLASS OF PROJECTIVELY FLAT FINSLER METRICS OF NEGATIVE CONSTANT FLAG CURVATURE

2012 ◽  
Vol 23 (08) ◽  
pp. 1250084 ◽  
Author(s):  
XIAOHUAN MO ◽  
HONGMEI ZHU
Keyword(s):  
Structure Theorem ◽  
Finsler Geometry ◽  
Flag Curvature ◽  
Finsler Metric ◽  
Finsler Metrics ◽  
Constant Flag Curvature ◽  
Projectively Flat ◽  
Slight Generalization ◽  
Negative Constant ◽  
World Scientific Publishing

In this paper, we prove a structure theorem for projectively flat Finsler metrics of negative constant flag curvature. We show that for such a Finsler metric if the orthogonal group acts as isometries, then the Finsler metric is a slight generalization of Chern–Shen's construction Riemann–Finsler geometry, Nankai Tracts in Mathematics, Vol. 6 (World Scientific Publishing, Hackensack, NJ, 2005), x+192 pp.

Geodesic orbit Finsler spaces with K ≥ 0 and the (FP) condition

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ming Xu
Keyword(s):  
Lie Algebra ◽  
Finsler Space ◽  
Finsler Manifold ◽  
Constant Speed ◽  
Flag Curvature ◽  
Finsler Metric ◽  
Coset Space ◽  
Finsler Spaces ◽  
Negatively Curved ◽  
Positively Curved

Abstract We study the interaction between the g.o. property and certain flag curvature conditions. A Finsler manifold is called g.o. if each constant speed geodesic is the orbit of a one-parameter subgroup. Besides the non-negatively curved condition, we also consider the condition (FP) for the flag curvature, i.e. in any flag we find a flag pole such that the flag curvature is positive. By our main theorem, if a g.o. Finsler space (M, F) has non-negative flag curvature and satisfies (FP), then M is compact. If M = G/H where G has a compact Lie algebra, then the rank inequality rk 𝔤 ≤ rk 𝔥+1 holds. As an application,we prove that any even-dimensional g.o. Finsler space which has non-negative flag curvature and satisfies (FP) is a smooth coset space admitting a positively curved homogeneous Riemannian or Finsler metric.

On Some Non-Riemannian Quantities in Finsler Geometry

2013 ◽  
Vol 56 (1) ◽  
pp. 184-193 ◽  
Author(s):  
Zhongmin Shen
Keyword(s):  
Finsler Geometry ◽  
Flag Curvature ◽  
Finsler Metrics ◽  
Geometric Properties

AbstractIn this paper we study several non-Riemannian quantities in Finsler geometry. These non- Riemannian quantities play an important role in understanding the geometric properties of Finsler metrics. In particular, we study a new non-Riemannian quantity defined by the S-curvature. We show some relationships among the flag curvature, the S-curvature, and the new non-Riemannian quantity.

scholarly journals A class of Randers metrics of scalar flag curvature

2020 ◽  
Vol 31 (13) ◽  
pp. 2050114
Author(s):  
Xinyue Cheng ◽  
Li Yin ◽  
Tingting Li
Keyword(s):  
Necessary Conditions ◽  
Finsler Geometry ◽  
Classification Problem ◽  
Flag Curvature ◽  
Finsler Metrics ◽  
Randers Metrics

One of the most important problems in Finsler geometry is to classify Finsler metrics of scalar flag curvature. In this paper, we study the classification problem of Randers metrics of scalar flag curvature. Under the condition that [Formula: see text] is a Killing 1-form, we obtain some important necessary conditions for Randers metrics to be of scalar flag curvature.

scholarly journals ON THE FLAG CURVATURE OF FINSLER METRICS OF SCALAR CURVATURE

2003 ◽  
Vol 68 (03) ◽  
pp. 762-780 ◽  
Author(s):  
XINYUE CHEN ◽  
XIAOHUAN MO ◽  
ZHONGMIN SHEN
Keyword(s):  
Scalar Curvature ◽  
Flag Curvature ◽  
Finsler Metrics

On a Class of Landsberg Metrics in Finsler Geometry

2009 ◽  
Vol 61 (6) ◽  
pp. 1357-1374 ◽  
Author(s):  
Zhongmin Shen
Keyword(s):  
Open Problem ◽  
Finsler Geometry ◽  
Riemannian Metric ◽  
Scalar Function ◽  
Parameter Family ◽  
Finsler Metric ◽  
Finsler Metrics ◽  
Landsberg Metric ◽  
Two Parameter

Abstract In this paper, we study a long existing open problem on Landsberg metrics in Finsler geometry. We consider Finsler metrics defined by a Riemannian metric and a 1-form on a manifold. We show that a regular Finsler metric in this form is Landsbergian if and only if it is Berwaldian. We further show that there is a two-parameter family of functions, ɸ = ɸ(s), for which there are a Riemannian metric 𝜶 and a 1-form ᵦ on a manifold M such that the scalar function F = 𝜶ɸ(ᵦ/𝜶) on TM is an almost regular Landsberg metric, but not a Berwald metric.

SOME RESULTS ON THE NON-RIEMANNIAN QUANTITY H OF A FINSLER METRIC

2011 ◽  
Vol 22 (07) ◽  
pp. 925-936 ◽  
Author(s):  
QIAOLING XIA
Keyword(s):  
Finsler Geometry ◽  
Finsler Manifold ◽  
Finsler Metric ◽  
Randers Metric ◽  
Rigidity Theorems

In this paper, we study the non-Riemannian quantity H in Finsler geometry. We obtain some rigidity theorems of a compact Finsler manifold under some conditions related to H. We also prove that the S-curvature for a Randers metric is almost isotropic if and only if H almost vanishes. In particular, S-curvature is isotropic if and only if H = 0.

scholarly journals On Twisted Products Finsler Manifolds

ISRN Geometry ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
E. Peyghan ◽  
A. Tayebi ◽  
L. Nourmohammadi Far
Keyword(s):  
Finsler Manifold ◽  
Finsler Metrics ◽  
Riemannian Curvature ◽  
Twisted Product ◽  
Finsler Manifolds ◽  
Vertical Distributions ◽  
Horizontal And Vertical Distributions

On the product of two Finsler manifolds , we consider the twisted metric which is constructed by using Finsler metrics and on the manifolds and , respectively. We introduce horizontal and vertical distributions on twisted product Finsler manifold and study C-reducible and semi-C-reducible properties of this manifold. Then we obtain the Riemannian curvature and some of non-Riemannian curvatures of the twisted product Finsler manifold such as Berwald curvature, mean Berwald curvature, and we find the relations between these objects and their corresponding objects on and . Finally, we study locally dually flat twisted product Finsler manifold.

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