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• W4308403699 abstract "Abstract The stability of topological solitary waves and pulses in one-dimensional nonlinear Klein–Gordon systems is revisited. The linearized equation describing small deviations around the static solution leads to a Sturm–Liouville problem, which is solved in a systematic way for the <?CDATA $-l,(l+1),mathrm{sech}^2(x)$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>−</mml:mo> <mml:mi>l</mml:mi> <mml:mo stretchy=false>(</mml:mo> <mml:mi>l</mml:mi> <mml:mo>+</mml:mo> <mml:mn>1</mml:mn> <mml:mo stretchy=false>)</mml:mo> <mml:msup> <mml:mrow> <mml:mi mathvariant=normal>s</mml:mi> <mml:mi mathvariant=normal>e</mml:mi> <mml:mi mathvariant=normal>c</mml:mi> <mml:mi mathvariant=normal>h</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> <mml:mo stretchy=false>(</mml:mo> <mml:mi>x</mml:mi> <mml:mo stretchy=false>)</mml:mo> </mml:math> -potential, showing the orthogonality and completeness relations fulfilled by the set of its solutions for all values <?CDATA $linmathbb{N}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>l</mml:mi> <mml:mo>∈</mml:mo> <mml:mrow> <mml:mi mathvariant=double-struck>N</mml:mi> </mml:mrow> </mml:math> . This approach enables the linear stability of kinks and pulses of certain nonlinear Klein–Gordon equations to be determined. The inverse problem, which starts from Sturm–Liouville problem and obtains nonlinear Klein–Gordon potentials, is also revisited and solved in a direct way. The exact solutions (kinks and pulses) for these potentials are calculated, even when the nonlinear potential is not explicitly known. The kinks are found to be stable, whereas the pulses are unstable. The stability of the pulses is achieved by introducing certain spatial inhomogeneities." @default.
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• W4308403699 date "2022-11-18" @default.
• W4308403699 modified "2023-10-04" @default.
• W4308403699 title "Stability of solitary waves in nonlinear Klein–Gordon equations" @default.
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