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I'm a physics grad student just trying to figure out all this stuff like everyone else.
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May 9 |
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Derivation of the volume element (which uses the metric tensor)? Towards the end of Chapter 2 of Sean Carroll's lecture notes: preposterousuniverse.com/grnotes |
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Apr 20 |
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Connection and Christoffel symbols -1. This isn't even phrased as a question. It is literally an assignment for us to do your homework for you. |
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Apr 16 |
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Higgs boson/field symmetries and local symmetries Some people have researched an `accidental' global symmetry. See Little Higgs: arxiv.org/abs/hep-ph/0512128 |
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Apr 16 |
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Do objects have energy because of their charge? It not clear to me what you are asking. Are you asking if charge and energy are the same thing? Or if charge creates energy somehow? |
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Apr 14 |
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Photon as the carrier of the electromagnetic force As for your second question:math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html |
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Apr 13 |
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Solving the soliton equation without energy What do you mean E is missing? Scrednicki has simply found a minimum of E by writing it as a sum of positive definite quantities, and then extremizing (making E as small as possible). The minimum for E will be when the first term in 92.5 is zero. |
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Apr 13 |
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Dynamics of an object hitting a spring Is this homework? |
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Apr 13 |
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About the seesaw mechanism @twistor59 - I was a little worried that the redefinition might be anomalous. Maybe its not, or maybe it just doesn't matter, or maybe its not anomalous because the gauge group is SU(2). |
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Apr 12 |
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About the seesaw mechanism Scrednicki pg556 web.physics.ucsb.edu/~mark/ms-qft-DRAFT.pdf states that you can just take $\nu \rightarrow i\nu $ to get ride of the phase. This clearly takes care of the sign of the mass term, and does't change the kinetic term since that will pick up a factor of $(+i)(-i) = +1$. Off hand its not clear to me this doesn't affect any other terms in the Lagrangian or doesn't create any anomaly issues...but apparently its ok. |
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Apr 12 |
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About the seesaw mechanism I get the minus sign you are talking about, and so does wikipedia en.wikipedia.org/wiki/Seesaw_mechanism. I am thinking about if this matters or not... |
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Apr 12 |
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Units for physical constants Also related, perhaps a duplicate of: physics.stackexchange.com/questions/8373/… |
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Apr 12 |
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Units for physical constants Related: physics.stackexchange.com/questions/10709/… |
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Apr 12 |
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Time inside a Black hole That assumes you can somehow observe the clock ticking on the inside of the black hole while standing on the outside. So I don't know what sort of meaning you can ascribe to clocks ticking on the inside of a black hole. Perhaps an expert (which I am not) can step in. |
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Apr 11 |
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Potential in Relativistic Scalar Field Theory @QFTdreamer - the transformation you are asking for was giving in a prior answer to another question of yours. See physics.stackexchange.com/questions/52590/… |
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Apr 9 |
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Capacitors and resistor in series and in parallel Is your question the HW question itself, or is there another set of questions you are just trying to get to after you straighten this out? Like Zetta said, none of these are in series or parallel. However, that doesn't mean you can't say anything about the current in the circuit. |
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Apr 8 |
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Tension $T$ in cable @user22922 No shame in being new. Jerry is indicating you will probably get a lot more help/responses from people if you include your attempt or reduce it to a conceptual question. |
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Apr 8 |
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Different approaches to calculating the Christoffel symbols @Gene - no problem. I am pretty sure I lost an afternoon of my life to these factors of 2 at one point, so I am happy to help. |
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Apr 5 |
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Quantum Electrodynamics Related: math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html |
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Apr 5 |
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A ring placed along $y^2 + z^2 = 4$, $x = 0$ carries a uniform charge of $5 \mu\ C/m$. Find $D$ at $P(3,0,0)$ The vector $\mathbf{r}$ that appears in Coloumb's law for a point for a point charge, points from the charge that generates the electric field to the point where you want to find the electric field. For the case you are considering, $\mathbf{r}$ points from the charge $dQ$ to the point $(3,0,0)$. |
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Apr 4 |
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exercise books for Feynman diagrams I am a little confused by what you mean when you say you know QFT but still need practice with Feynman diagrams. I would suggest just trying to work out the examples in textbooks like Scrednicki and Peskin, if you haven't already. Also you can peruse the web for classes people have taught where HW exercises and solutions have been posted. Better yet, just get involved with some research and you will learn what you need to know. |
