<p>We study the existence of normalized solutions for the following Choquard system: <Equation ID="Equ54"> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{aligned}&amp;-\Delta u + \lambda _1 u = \left( I_\alpha *F(u)\right) f(u) + \beta \partial _u H(u,v), &amp; \text { in } \mathbb {R}^2,\\&amp;-\Delta v + \lambda _2 v = \left( I_\alpha *G(v)\right) g(v) + \beta \partial _v H(u,v), &amp; \text { in } \mathbb {R}^2,\\&amp;\int _{\mathbb {R}^{2}} {|u|^2}\,\textrm{d} x = a^2, \int _{\mathbb {R}^{2}} {|v|^2}\,\textrm{d} x = b^2, \end{aligned}\right. \end{aligned}\)</EquationSource> </Equation>where <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(a, b &gt; 0 \)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\alpha \in (0, 2) \)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\beta &gt; 0 \)</EquationSource> </InlineEquation>. Here, <i>f</i>, <i>g</i> have an exponential critical growth, <i>H</i> is a Carathéodory function, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(F(t):= \int _0^{t}{f(s)}\,\textrm{d} s \)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(G(t):= \int _0^{t}{g(s)}\,\textrm{d} s \)</EquationSource> </InlineEquation>. <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(I_\alpha \)</EquationSource> </InlineEquation> is the Riesz potential and <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\lambda _1, \lambda _2 \in \mathbb {R}\)</EquationSource> </InlineEquation> appear as unknown Lagrange multipliers. We focus on the coupled pure mass super-critical case and establish the existence of normalized mountain pass solution for all <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(a, b &gt; 0\)</EquationSource> </InlineEquation>. Under some further assumptions, the normalized ground state solution is also obtained.</p>

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Normalized solutions for the coupled Choquard system with exponential critical growth in \({\mathbb {R}}^2\)

  • Zilin Chen,
  • Yang Yang

摘要

We study the existence of normalized solutions for the following Choquard system: \(\begin{aligned} \left\{ \begin{aligned}&-\Delta u + \lambda _1 u = \left( I_\alpha *F(u)\right) f(u) + \beta \partial _u H(u,v), & \text { in } \mathbb {R}^2,\\&-\Delta v + \lambda _2 v = \left( I_\alpha *G(v)\right) g(v) + \beta \partial _v H(u,v), & \text { in } \mathbb {R}^2,\\&\int _{\mathbb {R}^{2}} {|u|^2}\,\textrm{d} x = a^2, \int _{\mathbb {R}^{2}} {|v|^2}\,\textrm{d} x = b^2, \end{aligned}\right. \end{aligned}\) where \(a, b > 0 \) , \(\alpha \in (0, 2) \) and \(\beta > 0 \) . Here, f, g have an exponential critical growth, H is a Carathéodory function, \(F(t):= \int _0^{t}{f(s)}\,\textrm{d} s \) and \(G(t):= \int _0^{t}{g(s)}\,\textrm{d} s \) . \(I_\alpha \) is the Riesz potential and \(\lambda _1, \lambda _2 \in \mathbb {R}\) appear as unknown Lagrange multipliers. We focus on the coupled pure mass super-critical case and establish the existence of normalized mountain pass solution for all \(a, b > 0\) . Under some further assumptions, the normalized ground state solution is also obtained.