<p>In this paper, we study a class of flows of closed, star-shaped hypersurfaces in hyperbolic space <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathbb {H}^{n+1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">H</mi> </mrow> <mrow> <mi>n</mi> <mo>+</mo> <mn>1</mn> </mrow> </msup> </math></EquationSource> </InlineEquation> with speed <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\((\sinh r)^{{\alpha }/{\beta }} \sigma _{k}^{{1}/{\beta }}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mo stretchy="false">(</mo> <mo>sinh</mo> <mi>r</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>α</mi> <mo stretchy="false">/</mo> <mi>β</mi> </mrow> </msup> <msubsup> <mi>σ</mi> <mrow> <mi>k</mi> </mrow> <mrow> <mn>1</mn> <mo stretchy="false">/</mo> <mi>β</mi> </mrow> </msubsup> </mrow> </math></EquationSource> </InlineEquation>, where <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\sigma _{k}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>σ</mi> <mi>k</mi> </msub> </math></EquationSource> </InlineEquation> is the <i>k</i>-th elementary symmetric polynomial of the principal curvatures, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\alpha \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>α</mi> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\( \beta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>β</mi> </math></EquationSource> </InlineEquation> are positive constants and <i>r</i> is the distance from points on the hypersurface to the origin. We obtain convergence results under some assumptions of <i>k</i>, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\alpha \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>α</mi> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\( \beta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>β</mi> </math></EquationSource> </InlineEquation>. When <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(k = 1, \alpha &gt; 1 + \beta \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mi>α</mi> <mo>&gt;</mo> <mn>1</mn> <mo>+</mo> <mi>β</mi> </mrow> </math></EquationSource> </InlineEquation>, and the initial hypersurface is mean convex, we prove that the mean convex solution to the flow for <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\( k=1 \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> exists for all time and converges smoothly to a sphere. When <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(1\le k \le n, \alpha &gt; k+\beta \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mo>≤</mo> <mi>k</mi> <mo>≤</mo> <mi>n</mi> <mo>,</mo> <mi>α</mi> <mo>&gt;</mo> <mi>k</mi> <mo>+</mo> <mi>β</mi> </mrow> </math></EquationSource> </InlineEquation>, and the initial hypersurface is uniformly convex, we prove that the uniformly convex solution to the flow exists for all time and converges smoothly to a sphere. In particular, we generalize Li-Sheng-Wang’s results in [<CitationRef CitationID="CR10">10</CitationRef>] from Euclidean space to hyperbolic space.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

On a Class of Fully Nonlinear Curvature Flows in Hyperbolic Space

  • Fang Hong

摘要

In this paper, we study a class of flows of closed, star-shaped hypersurfaces in hyperbolic space \(\mathbb {H}^{n+1}\) H n + 1 with speed \((\sinh r)^{{\alpha }/{\beta }} \sigma _{k}^{{1}/{\beta }}\) ( sinh r ) α / β σ k 1 / β , where \(\sigma _{k}\) σ k is the k-th elementary symmetric polynomial of the principal curvatures, \(\alpha \) α , \( \beta \) β are positive constants and r is the distance from points on the hypersurface to the origin. We obtain convergence results under some assumptions of k, \(\alpha \) α and \( \beta \) β . When \(k = 1, \alpha > 1 + \beta \) k = 1 , α > 1 + β , and the initial hypersurface is mean convex, we prove that the mean convex solution to the flow for \( k=1 \) k = 1 exists for all time and converges smoothly to a sphere. When \(1\le k \le n, \alpha > k+\beta \) 1 k n , α > k + β , and the initial hypersurface is uniformly convex, we prove that the uniformly convex solution to the flow exists for all time and converges smoothly to a sphere. In particular, we generalize Li-Sheng-Wang’s results in [10] from Euclidean space to hyperbolic space.