Physics:Quantum methods/perturbation: Difference between revisions

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{{Short description|Approximation method for solving quantum systems}}
{{Short description|Approximation method for solving quantum systems}}
{{Quantum book backlink|Field and many-body methods}}
{{Quantum methods backlink|Field and many-body methods}}
{{Quantum methods backlink|Field and many-body methods}}


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'''Perturbation theory''' is a mathematical method used to approximate the behavior of a quantum system by starting from a solvable system and adding a small interaction.
'''Perturbation theory''' is a mathematical method used to approximate the behavior of a quantum system by starting from a solvable system and adding a small interaction.


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<div style="font-size:90%;">Perturbation theory expands solutions in powers of a small parameter.</div>
<div style="font-size:90%;">Perturbation theory expands solutions in powers of a small parameter.</div>
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Revision as of 15:50, 17 May 2026


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Perturbation theory is a mathematical method used to approximate the behavior of a quantum system by starting from a solvable system and adding a small interaction.

Perturbation theory expands solutions in powers of a small parameter.
Quantum methods/perturbation.

Overview

Many quantum systems cannot be solved exactly. Perturbation theory provides approximate solutions by expanding in a small parameter.

Types

  • Time-independent perturbation theory
  • Time-dependent perturbation theory

Applications

Used in atomic physics, quantum chemistry, and particle physics.

See also

Table of contents (217 articles)

Index

Full contents

References


Author: Harold Foppele


Source attribution: Physics:Quantum Perturbation theory

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