All Questions
Tagged with definition hilbert-space
7
questions with no upvoted or accepted answers
2
votes
0
answers
115
views
What is the definition of bound state in quantum field theory?
I asked a question a while a go what is a bound state and the question was closed because there is a similar question.
Now since best description we have to describe nature in quantum field theory
How ...
2
votes
1
answer
87
views
What is a neutrino state if not a particle?
When reading about the 2015 Nobel prize and how this led to the possibility of the existence of sterile neutrinos I am told that:
"(...) three active neutrinos $\nu_e$, $\nu_\mu$, $\nu_\tau$, are ...
0
votes
0
answers
74
views
What is a state space in quantum mechanics?
I have begun reading chapter 11 of Zwiebach's "A First Course in String Theory" 2nd edition. Section 11.2 deals with the Heisenberg and Schrodinger pictures. Both pictures will use the same &...
0
votes
0
answers
54
views
Inner product evaluation in QM
On wikipedia on the page for inner product it states that for any two $x,y$ in a vector space $V$ the inner product $(\cdot , \cdot)$ satisfies $(ax, y) = a(x,y)$ where $a\in\mathbb{C}$.
The inner ...
0
votes
0
answers
154
views
Off-shell vs half off-shell vs fully off-shell $T$-matrix
I know what are on-shell particles, but I want to know what are off-shell, and half off-shell, and fully off-shell states? and how we decide to consider one of these states in evaluating $T$-Matrix?
0
votes
0
answers
418
views
Difference between pure and thermal states
As far as I know by inserting a harmonic potential $V(x) = \frac{1}{2}m \omega x^2$ into the time-independent schrödinger equation I can obtain the wave-functions eigenstates and eigenvalues (energies)...
-2
votes
1
answer
89
views
What is meant by Projected Hilbert space?
What is meant by Projected Hilbert space? I know almost everything about coherent states. But I don't know the use of projected coherent states. I googled, but I can't find any source.