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1d
comment Is there some special case where a fermion can mediate a force?
Oops, I didn't mean to put a vev $\langle \rangle$ above. @arivero: Yes, that's what I was wondering -- the composite force mediating degree-of-freedom is again bosonic, now!
1d
comment Is there some special case where a fermion can mediate a force?
I wonder if the fermion loop is equivalent to a composite bosonic operator $\langle \bar{\psi} \psi \rangle$ mediating the force.
Oct
21
revised How do particles become entangled?
added 395 characters in body
Oct
21
comment Effective Field Theories of QCD
@soliton: If you've made any progress in the course, you might be able to answer your own question. I think it will help many others :-)
Oct
20
comment Is there some special case where a fermion can mediate a force?
@arivero, I understand and for the same reason, my answer is measured.
Oct
19
answered Is there some special case where a fermion can mediate a force?
Oct
18
comment Is there a connection between the fluctuation-dissipation theorem and the Green–Kubo relations?
her book :-)
Oct
13
comment $D$-brane and 5th dimensions
The "p" in p-brane stands in for the number of spatial dimensions that a brane covers. The "D" in D-brane stands for something quite different: It states that this brane provides "Dirichlet" boundary conditions for the strings roaming around in space.
Oct
12
comment Gravity as a gauge theory
Though this might not be what the OP had in mind, a recent concept that is becoming interesting is that a gravity theory could be thought of as a product of two copies of gauge theories. For eg, look at: arxiv.org/abs/1004.0476
Oct
10
awarded  Organizer
Oct
10
revised What causes Paulis Exclusion Principle?
edited tags
Oct
10
answered What causes Paulis Exclusion Principle?
Oct
8
comment Scalar field divergent mass correction interpretation question (hierarchy problem)
"it's telling me that I have a correction as big as the largest scale in my problem (cut-off scale)" -- that's not quite true. Any corrections to the mass are suppressed by positive powers of the loop factor $\frac{g^2}{16 \pi^2}$.
Oct
6
revised Connection between Gauge Fixing Term and Gauge Condition
added 13 characters in body
Oct
4
answered What produces String tension in Strings theory?
Oct
3
comment Dilaton field and Scale symmetry breaking
Interesting question. From what I understand, you are asking how SSB of scale symmetry in QFT (by dimensional transmutation) can be seen from the perspective of the dilaton. I wonder if one can do a spurion analysis.
Oct
3
comment Calculate the equivalent resistance between A and B
For more information on how to approach "unbalanced" bridges, check here: ibiblio.org/kuphaldt/electricCircuits/DC/DC_10.html
Oct
3
comment Calculate the equivalent resistance between A and B
This setup is called the Wheatstone bridge. Since the bridge is "balanced" (read he Wikipedia article) there will be no current in the $5 \Omega$ resistor and you can essentially "disconnect" it.
Sep
30
awarded  Explainer
Sep
27
comment What does it mean to “convert energy into time”?
Quite possibly slips between what the scientist intended to say, what was actually said, what was heard by the journalist, what the journalist thought was said, what the journalist expressed that as, in the article and what the editor thought it should be written as.