An analogue of the Pöschl–Teller anharmonic oscillator on an N-dimensional sphere

Abstract A Schrödinger particle on an N -dimensional ( $$N\geqslant 2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>⩾</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> ) hypersphere of radius R is considered. The particle is subjected to the action of a force characterized by the potential $$V(\theta )=2m\omega _{1}^{2}R^{2}\tan ^{2}(\theta /2) +2m\omega _{2}^{2}R^{2}\cot ^{2}(\theta /2)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>V</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mi>m</mml:mi> <mml:msubsup> <mml:mi>ω</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:msup> <mml:mo>tan</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>+</mml:mo> <mml:mn>2</mml:mn> <mml:mi>m</mml:mi> <mml:msubsup> <mml:mi>ω</mml:mi> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:msup> <mml:mo>cot</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> , where $$0\leqslant \theta \leqslant \pi$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>0</mml:mn> <mml:mo>⩽</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>⩽</mml:mo> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> is the hyperlatitude angular coordinate. In the general case when $$\omega _{1}\ne \omega _{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:mo>≠</mml:mo> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> , this is a model of a hyperspherical analogue of the Pöschl–Teller anharmonic oscillator. Energy eigenvalues and normalized eigenfunctions for this system are found in closed analytical forms. For $$N=2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> , our results reproduce those obtained by Kazaryan et al . (Physica E 52:122, 2013). For $$N\geqslant 2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>⩾</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> arbitrary and for $$\omega _{2}=0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:math> , the results of Mardoyan and Petrosyan (J. Contemp. Phys. 48:70, 2013) for their model of an isotropic hyperspherical harmonic oscillator are recovered. The Euclidean limit for the anharmonic oscillator in question is also discussed.

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Journal
The European Physical Journal Plus
Published
2025-05-05
DOI
https://doi.org/10.1140/epjp/s13360-025-06252-w
Primary Topic
Quantum Mechanics and Non-Hermitian Physics
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article
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article

An analogue of the Pöschl–Teller anharmonic oscillator on an N-dimensional sphere

Radosław Szmytkowski
The European Physical Journal Plus
Quantum Mechanics and Non-Hermitian Physics
article

An analogue of the Pöschl–Teller anharmonic oscillator on an N-dimensional sphere

Radosław Szmytkowski
article en

Abstract

Abstract A Schrödinger particle on an N -dimensional ( $$N\geqslant 2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>⩾</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> ) hypersphere of radius R is considered. The particle is subjected to the action of a force characterized by the potential $$V(\theta )=2m\omega _{1}^{2}R^{2}\tan ^{2}(\theta /2) +2m\omega _{2}^{2}R^{2}\cot ^{2}(\theta /2)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>V</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mi>m</mml:mi> <mml:msubsup> <mml:mi>ω</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:msup> <mml:mo>tan</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>+</mml:mo> <mml:mn>2</mml:mn> <mml:mi>m</mml:mi> <mml:msubsup> <mml:mi>ω</mml:mi> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:msup> <mml:mo>cot</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> , where $$0\leqslant \theta \leqslant \pi$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>0</mml:mn> <mml:mo>⩽</mml:mo> <mml:mi>θ</mml:mi> <mml:mo>⩽</mml:mo> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> is the hyperlatitude angular coordinate. In the general case when $$\omega _{1}\ne \omega _{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:mo>≠</mml:mo> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> , this is a model of a hyperspherical analogue of the Pöschl–Teller anharmonic oscillator. Energy eigenvalues and normalized eigenfunctions for this system are found in closed analytical forms. For $$N=2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> , our results reproduce those obtained by Kazaryan et al . (Physica E 52:122, 2013). For $$N\geqslant 2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>⩾</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> arbitrary and for $$\omega _{2}=0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>ω</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:math> , the results of Mardoyan and Petrosyan (J. Contemp. Phys. 48:70, 2013) for their model of an isotropic hyperspherical harmonic oscillator are recovered. The Euclidean limit for the anharmonic oscillator in question is also discussed.

The European Physical Journal PlusVol. 140(5)
Gdańsk University of Technology (PL)
Openalex Percentile: Top 93%
Quantum Mechanics and Non-Hermitian Physics
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