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location Germany
age 26
visits member for 2 years, 9 months
seen Nov 12 '12 at 16:17

Grad. Student


Jul
8
awarded  Yearling
Jul
8
awarded  Yearling
Jul
6
comment How to define a field?
Well, Ferromagnets have the property that they consist of alot of tiny elementary magnets, all aligned in one direction. Each of these elementary magnets carries a Magnetic Moment: en.wikipedia.org/wiki/Magnetic_moment
Jul
6
comment How to define a field?
Perhaps you mean something different when talking about fields. But in QFT, a field itself is just some function of space-time (see my answer below). The really interesting part is, how these fields transform. Or more precisely, what type of elements are assigned to each point in space. This is how we define the particle associated to that field
Jul
6
comment How to define a field?
A field isn't a fundamental object from a mathematical viewpoint. You can define riggidly how fields work/look like
Jul
6
answered How to define a field?
Jul
1
accepted 1-Dimensional Sigma Models
Jul
1
awarded  Citizen Patrol
Jun
21
asked 1-Dimensional Sigma Models
Jun
19
answered Supersymmetry in Quantum Field Theory
May
8
answered Does the movement of things in the universe will cease one day?
May
4
awarded  Nice Question
May
4
awarded  Self-Learner
May
4
awarded  Nice Question
Apr
3
answered About the definition/motivation/properties of the twisted chiral superfield in ${\cal N}=2$ theories in $1+1$ dimensions
Mar
5
comment Mathematical Physics Book Recommendation
The Table of Contents of this book does look very tempting. How did you perceive this book? The Amazon reviews seem to be very negative
Jan
31
comment Models of neutrinos consistent with OPERA's results
I took a look at your paper and it looks like a nice manipulation of equations (i did not check for consistency). Which has been done quite a lot recently to describe the Opera results. This however does not answer the question above, if there are any Neutrino Models describing this effect.
Jan
25
comment References for phase-transitions in supersymmetric field theory
The order Parameter in this case is the $r$-Parameter which arises by including the Fayet-Iliopoulos D-Term. Depending on what value $r$ takes, different constraints arise for our Compactification (Calabi-Yau or Orbifolds). The Big picture in this case is what I wrote as my last sentence in the answer above.
Jan
17
comment References for phase-transitions in supersymmetric field theory
It might seem like that, as both the paper and lecture are about the geometrical properties of these theories, however, the lecture you linked is on a different subject. (Keep in mind however that I only read the Introductions to each lecture you posted) For example, the paper I linked is studying 2D N=2 SUSY (which you get by reducing 4D N=1 SUSY by 2 dimensions) and the lectures you posted are on 4D N=2 SUSY, which are both very different.
Jan
16
comment Readable books on advanced topics
While I did not vote, but judging from the Amazon page, this book does look like a popularisation.