The bosons tag has no wiki summary.
6
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1answer
141 views
How can a massless boson (Gluon) mediate the short range Strong Force?
I thought massless particles were mediators for long range forces such as electromagnetism and gravitation. How can the massless gluon mediate the short range strong force?
6
votes
1answer
112 views
Who added $\frac{3}{2} \partial^2 c$ to the virasoro BRST current (and why)?
I've been looking at the literature on quantizing the bosonic string, and I noticed that there was a change made in the definition of the BRST current around 1992. However, I haven't found any ...
6
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2answers
191 views
Huge confusion with Fermions and Bosons and how they relate to total spin of atom
I am supremely confused when something has spin or when it does not. For example, atomic Hydrogen has 4 fermions, three quarks to make a proton, and 1 electron. There is an even number of fermions, ...
5
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3answers
189 views
Why do Photons want to be together?
So I've heard that when a photon flies by a atom excited enough to release a photon there's a good chance it will. Because Photons want to be together and have the same direction etc?
Is this true? ...
5
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2answers
91 views
Is ground energy of interacting fermions always higher that that of bosons?
Consider two systems, each made of $N$ particles. In both systems particles interact pairwise and the interaction is given by the same Hamiltonian for both systems. Any other constraints and/or ...
5
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1answer
138 views
Probability enhancement for bosons: Probability goes over 1?
It is said that if there is already n bosons in a particular quantum state, the probability of another boson joining them is (n+1) times larger than it would have been otherwise. But if we apply this ...
3
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1answer
126 views
From spectrum/dispersion relation to the partition function
I know the spectrum/dispersion relation for a bosonic system.
$$E \left( \mathbf{k} \right) = \cdots$$
Is there a general method for writing down the partition function when the spectrum of the ...
3
votes
2answers
68 views
Composition of squeeze operators?
I'm wondering if it exists a composition law for the squeezing operation ? I guess so for geometric reason, since they are (generalized, and the phase is annoying of course) hyperbolic rotations of ...
3
votes
1answer
109 views
Is there record of a bosonic Stern-Gerlach measurement?
I cannot seem to find any peer-reviewed (or other) reference to an integer-spin Stern-Gerlach experiment. It shouldn't be too hard to do: just find you friendly neighbourhood Deuterium ion and shoot ...
3
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1answer
103 views
Decay of a particle
Would someone please explain the following found on P. 125 of these notes?
On the other hand, two $π^0$’s cannot be in an $l = 1$ state. The reason for this is that pions are bosons and so the ...
3
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1answer
120 views
First order coherence function in terms of momentum distribution function
Can someone show me how the first order coherence function $G^1(r,r')\equiv \left \langle \hat{\Psi}(r)\hat{\Psi}(r') \right \rangle $ for a system of bosons is related to the momentum distribution ...
3
votes
1answer
205 views
Understanding the Bose-Fermi dichotomy
I'm an amateur on a quest to understand QM. In various places (such as early in chapter III.4 of the Feynman Lectures) I have seen an argument that looks like it's trying to convince me that any class ...
2
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1answer
41 views
Chemical potential of a Bose gas
In my course, there is this fact :
In a Bose gas, the chemical potential $\mu$ must always be lower than
the smaller level of energy $\epsilon_0$.
I find this strange, because if we put a Bose ...
2
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1answer
54 views
Bose gas with $T = 0$ and $\mu < 0$
Is it possible to have a Bose gas with $T = 0$ and $\mu < 0$ ?
I think that there is a problem, because all the states $k$ are such as
$$\langle n_k \rangle = \dfrac{1}{e^{\beta \{\epsilon_k - ...
2
votes
1answer
67 views
How do particles become entangled?
A person asked me this and I'm just a lowly physical chemist.
I used a classical analogy (how good or bad is this and how to fix?)
Basically, light has a net angular momentum of zero, insofar as ...
2
votes
1answer
162 views
Canonical partition of a boson gas
I have a 1D gas made of $N$ particles placed in a harmonic potential well, so the Hamiltonian is:
$$ \mathcal H = \sum_{j=1}^N \left ( \frac{p_j^2}{2m} + \frac{1}{2}m\omega^2 x_j^2 \right )$$
The ...
2
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0answers
87 views
photon and Z boson interference?
I'm not certain that this question will make sense, but here goes...
In most monte carlo generators, when Z events are produced, there is a lower mass cutoff on the Z pole. I've been told that this ...
2
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0answers
148 views
Can the mass of longitudinal and transverse W bosons be measured separately?
Some higgsless unified models of particle physics predict that the mass of longitudinally polarized W bosons and the mass of transversely polarized W bosons are different.
In those models, a ...
2
votes
1answer
102 views
number of gravitons launched by a proton
The wikipedia article http://en.wikipedia.org/wiki/Gauge_bosons describes how in QM exchanges of gauge bosons carry force, and describes how the graviton may also be a gauge boson.
If the observable ...
1
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1answer
53 views
How to derive the expression for Bose-Einstein distribution variance?
Can anyone point me to a derivation of this expression? $n_s$ is the number of bosons in a state.
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0answers
67 views
How to understand the matrix behind a Hamiltonian?
thanks to the answers I received to my previous questions, I could derive correctly an elegant partition function for my problem which resembles a second quantized model taking the particles to be ...
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0answers
25 views
How does a state vector change under an exchange of a boson and a fermion?
How does a state vector change under an exchange of a boson and a fermion ? That's how is $\Psi_{\alpha,\beta}$ related to $\Psi_{\beta,\alpha}$ where $\alpha$ and $\beta$ are a boson and a fermion ...
1
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1answer
60 views
Combining two finite number fock spaces into one
Say I have two separate systems of identical Bosons, one with N Bosons the other with M. System one is described by a state $|\psi_1\rangle$ the other with $|\psi_2 \rangle$ which are expressed in a ...
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0answers
93 views
Fock picture of bosonification in condensates
I want to understand how bosonification in a condensate must be interpreted in the Fock states picture
Say i have uncoupled fermions in a set of states $E_1$, $E_2$ ... over the vacuum $E_0$. They ...
0
votes
2answers
2k views
Degeneracy of Energy Levels for 2 identical particles in a One Dimensional box [closed]
i am studying for a physics exam and came across an exercise i cannot seem to crack. I have read through Feynmans lecture books & a lot of the internet but i am somewhat stuck. first the question, ...
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0answers
56 views
Why is the transition into N proportional to N+1?
I am having trouble understanding the origin of the bosonic stimulated emission. How can I qualitatively understand why bosons Boson's attract each other into similar quantum states.
The furtherst I ...
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0answers
123 views
Research in Quantum Physics [closed]
I am Suvankar, a student of engienering. My branch is Electrical & Electronics Engineering. Although this is a Physics oriented website, I want to know whether it is possible to do M.Sc. after ...
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0answers
76 views
Does fractal geomtry suggest there is no smallest object?
Does fractal geometry prove that there is no such thing as the smallest object and that all atoms, particles, quarks, or bosons can continue to be broken down to infinity.
