# Questions tagged [wavefunction]

A complex scalar field that describes a quantum mechanical system. The square of the modulus of the wave function gives the probability of the system to be found in a particular state. DO NOT USE THIS TAG for classical waves.

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### Do spin wavefunctions live on a Hilbert space?

This question comes to mind while reading the quote in different books which is "Hilbert space is infinite dimensional". While the electron spin is 2 Dimensional problem. Secondly, we ...
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### Parity of ground state of truncated harmonic oscillator [closed]

**Why soln for truncated oscillator exist only when wave function is zero at x=0 and the states must be odd only? How to calculate parity for ground state of truncated harmonic oscillator?** strong ...
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### Clarification on calculating probabilities for a particles location (basic)

Say that we have a wave function $$\Psi(x,t)=c_1\Psi_1(x,t)+c_2\Psi_2(x,t)$$ where the particle is confined to $[0,a]$, $\Psi_i$ corresponds to the normalised wave function for energy $E_i$, and $c_i$ ...
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### Bound States of a Particle in a Half-Infinite Potential Plus a Delta Function [closed]

I am having some conceptual problems regarding the bound states. I will try to address them using a simple problem. Consider a particle which is under the effect of a half-infinite potential plus a ...
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### Using separation of variables to solve Schrödinger equation for a free particle

I was reading Introduction to Quantum Mechanics by David Griffiths and I am in Chapter 2, page 45. I know that since the solutions from Schrödinger equation cannot be normalized for a free particle. ...
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### Can different electron orbitals within the same atom be entangled?

Could the electron in the outer shell orbital be entangled with an electron within the inner S orbit of the atom? If so, how would this affect the properties of such an atom, such as emission and ...
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### Can we find the functional for a quantum field in QFT

I've heard that QFT is really described by a functional which dictates the probability that a field will be in a certain configuration $\Phi[\phi]$. My question is, can we find an equation that will ...
6k views

### What happens when a laser beam is stuck between two mirrors and the distance in-between is decreased gradually? Heisenberg Uncertainty Principle

Assuming a laser beam going back and forth between two mirrors, what would happen if we keep bring the mirrors closer and closer to each other? Because after a certain width, we would be knowing both ...
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### Is there a time component for each probable state of the wave function?

In other words, when does time or a time direction come into play or does it in the equations? Is there time or time directions associated with each probable state of a quantum system or does time ...
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### What is the difference between anti-symmetric wavefunction and asymmetric wavefunction?

In section 8.2.4, Zettili, in his book Quantum Mechanics, explains how we can construct symmetric and anti-symmetric wavefunctions using asymmetric wavefunction. Although he explains that symmetric ...
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### How to calculate the amplitude of two degenerate vacuums?

I've seen in textbooks and heard from lecturers that spontaneous symmetry breaking (SSB) does not happen in quantum mechanics because of the tunnelling between two degenerate vacua (i.e amplitude of ...