<p>In this paper, we establish the sharp local uniform well-posedness of the higher-order nonlinear Schrödinger equations (HNLS) with cubic nonlinear terms <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\rm{i}}{\partial_t}u + {( - {\Delta_g})^m}u = - {\vert u \vert^2}u\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mrow> <mi mathvariant="normal">i</mi> </mrow> </mrow> <mrow> <msub> <mi mathvariant="normal">∂</mi> <mi>t</mi> </msub> </mrow> <mi>u</mi> <mo>+</mo> <mrow> <mo stretchy="false">(</mo> <mo>−</mo> <mrow> <msub> <mi mathvariant="normal">Δ</mi> <mi>g</mi> </msub> </mrow> <msup> <mo stretchy="false">)</mo> <mi>m</mi> </msup> </mrow> <mi>u</mi> <mo>=</mo> <mo>−</mo> <mrow> <msup> <mrow> <mo>∣</mo> <mi>u</mi> <mo>∣</mo> </mrow> <mn>2</mn> </msup> </mrow> <mi>u</mi> </math></EquationSource> </InlineEquation> on <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\mathbb{T}^2}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msup> <mrow> <mi mathvariant="double-struck">T</mi> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\mathbb{S}^2}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msup> <mrow> <mi mathvariant="double-struck">S</mi> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation>. Employing bilinear estimates and lattice point estimates, we prove that the well-posedness thresholds are <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({{s}_c}({\mathbb{T}^2}, m) = 0\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msub> <mrow> <mi>s</mi> </mrow> <mi>c</mi> </msub> </mrow> <mo stretchy="false">(</mo> <mrow> <msup> <mrow> <mi mathvariant="double-struck">T</mi> </mrow> <mn>2</mn> </msup> </mrow> <mo>,</mo> <mi>m</mi> <mo stretchy="false">)</mo> <mo>=</mo> <mn>0</mn> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({{s}_c}({\mathbb{S}^2}, m) = {1 \over 4}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msub> <mrow> <mi>s</mi> </mrow> <mi>c</mi> </msub> </mrow> <mo stretchy="false">(</mo> <mrow> <msup> <mrow> <mi mathvariant="double-struck">S</mi> </mrow> <mn>2</mn> </msup> </mrow> <mo>,</mo> <mi>m</mi> <mo stretchy="false">)</mo> <mo>=</mo> <mrow> <mfrac> <mn>1</mn> <mn>4</mn> </mfrac> </mrow> </math></EquationSource> </InlineEquation> for any order <i>m</i> ∈ ℕ. In contrast, for Euclidean spaces, it has been shown in [Miao, C., Zhang, B.: <i>Discrete Contin. Dyn. Syst.</i>, <b>17</b>, 181–200 (2006)] that <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\({{s}_c}({\mathbb{R}^d}, m) = {d \over 2}- m\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msub> <mrow> <mi>s</mi> </mrow> <mi>c</mi> </msub> </mrow> <mo stretchy="false">(</mo> <mrow> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>d</mi> </msup> </mrow> <mo>,</mo> <mi>m</mi> <mo stretchy="false">)</mo> <mo>=</mo> <mrow> <mfrac> <mi>d</mi> <mn>2</mn> </mfrac> </mrow> <mo>−</mo> <mi>m</mi> </math></EquationSource> </InlineEquation> if <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(m &lt; {d \over 2}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mi>m</mi> <mo>&lt;</mo> <mrow> <mfrac> <mi>d</mi> <mn>2</mn> </mfrac> </mrow> </math></EquationSource> </InlineEquation>. These reveal that the geometry of manifolds plays a crucial role in the dynamics of the cubic HNLS.</p>

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Sharp Well-posedness for Higher-order Schrödinger Equations on Torus and Sphere

  • Sijie Qian,
  • Jiqiang Zheng

摘要

In this paper, we establish the sharp local uniform well-posedness of the higher-order nonlinear Schrödinger equations (HNLS) with cubic nonlinear terms \({\rm{i}}{\partial_t}u + {( - {\Delta_g})^m}u = - {\vert u \vert^2}u\) i t u + ( Δ g ) m u = u 2 u on \({\mathbb{T}^2}\) T 2 and \({\mathbb{S}^2}\) S 2 . Employing bilinear estimates and lattice point estimates, we prove that the well-posedness thresholds are \({{s}_c}({\mathbb{T}^2}, m) = 0\) s c ( T 2 , m ) = 0 and \({{s}_c}({\mathbb{S}^2}, m) = {1 \over 4}\) s c ( S 2 , m ) = 1 4 for any order m ∈ ℕ. In contrast, for Euclidean spaces, it has been shown in [Miao, C., Zhang, B.: Discrete Contin. Dyn. Syst., 17, 181–200 (2006)] that \({{s}_c}({\mathbb{R}^d}, m) = {d \over 2}- m\) s c ( R d , m ) = d 2 m if \(m < {d \over 2}\) m < d 2 . These reveal that the geometry of manifolds plays a crucial role in the dynamics of the cubic HNLS.