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I'm a PhD student at Queen Mary, University of London. I'm interested in modern approaches to scattering amplitudes, in particular twistor methods.


12h
comment Integration & bremsstrahlung calculation
I still can't quite make sense of it. Do you know of any other papers which employ a similar method? It's not really my area (I'm more theoretical) so I think I'd need to read around a bit more before understanding it fully!
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revised Charge Conjugation Operator in Supermultiplet
improved clarity, formatting, grammar
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suggested suggested edit on Charge Conjugation Operator in Supermultiplet
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comment Integration & bremsstrahlung calculation
The key comes from understanding how their Lorentz frame choices work. I haven't quite got the hang of it yet, but I'll have another go tomorrow. I think that once you've worked out how to get from III.8 to III.10 the same process reversed will get you from III.10 to III.13.
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awarded  Nice Question
Oct
18
revised Philosophical Interpretation of String Theory
Improved spelling, grammar and overall question phrasing.
Oct
18
suggested suggested edit on Philosophical Interpretation of String Theory
Oct
17
comment Integration & bremsstrahlung calculation
Hmm - yes I agree his reasoning looks very dodgy. Hopefully it's just a series of typos. Can you tell me what $\eta$ is? I can't find an appropriate definition in a quick scan of those paragraphs!
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awarded  Explainer
Sep
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awarded  Autobiographer
Aug
28
comment Commutator algebra in exponents
Very nicely done! I hadn't thought of doing that!
Aug
28
answered Commutator algebra in exponents
Aug
27
answered Is quantum indeterministic?
Aug
27
comment What do you exactly mean when you say that momentum is conserved? In other words: Which momentum is conserved?
@bobie - I think what you're really confused about is the meaning of "elastic collision". I usually take this to mean that kinetic energy is conserved, so no energy is transferred into other forms. If we had a freely moving wall and a perfect elastic collision with the ball, then kinetic energy would be transferred from the ball to the wall. This would give the wall a small velocity, enough to conserve momentum. If the wall is fixed then it cannot gain overall kinetic energy. In this case the collision is not elastic, and momentum is conserved due to (e.g.) shockwaves within the wall.
Aug
26
comment What do you exactly mean when you say that momentum is conserved? In other words: Which momentum is conserved?
Originally you only looked at the ball itself. If you examine the whole system you can still get an elastic collision where the wall moves very slightly. Of course in reality the collision is unlikely to be completely elastic (in the sense that kinetic energy will not be conserved in the ball-wall system, you'll also have air resistance etc. to consider).
Aug
26
comment 1-particle momentum eigenfunction in terms of field operator for real Klein-Gordon field
Could you make your question a little more precise? I don't quite understand what you're confused about. You can plug in the mode expansion for $\phi(x)$ and derive the result. Do you want to know why we should expect this result?
Aug
26
answered What do you exactly mean when you say that momentum is conserved? In other words: Which momentum is conserved?
Aug
19
comment Clarification of Tensor, Jacobian
Glad to be of help! If this answer clear everything up then you should accept it by clicking the green tickmark on the left hand side. This helps keep the site clean!
Aug
18
answered Clarification of Tensor, Jacobian
Aug
1
revised Stability of D-Branes and Coupling to Fields
added extra research