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ALSINA BOLIVAR POL_4253558_assignsubmission_file_TFG-Alsina-Bolívar-Pol.pdf (587.33 KB)

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Bachelor thesis

Publication date

2021-07

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cc-by-nc-nd (c) Alsina, 2021
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/180590

Instanton approach to the decay of a metastable quantum state

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Abstract

The escape transition due to quantum tunnelling of a particle from a metastable region, created by a cubic potential, is studied. Finding this amplitude is reduced to the computation of a Feynman path integral. This calculus has been carried out using the instanton method, which demands to rotate the time coordinate along the imaginary plane. The results obtained show that the ground state energy has actually an imaginary part (fact that is actually related to the metastability of the system) and allows to find the decaying rate of the metastable state

Description

Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: Oleg Bulashenko

Subject

Efecte túnel, Estat quàntic, Treballs de fi de grau

Subject (English)

Tunneling (Physics), Quantum state, Bachelor's theses

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Treballs Finals de Grau (TFG) - Física

Citation

ALSINA BOLÍVAR, Pol. Instanton approach to the decay of a metastable quantum state. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/180590

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