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location London, United Kingdom
age 30
visits member for 3 years, 9 months
seen Sep 4 at 18:03

Phd student


Jul
18
comment what is the difference between a blackhole and a point particle
Possibly related: physics.stackexchange.com/questions/9529/…
Jul
18
comment Are there books on Regularization and Renormalization in QFT at an Introductory level?
There was a recent blog post about these issues that you might find useful, it's here: motls.blogspot.com/2011/07/…
Jul
17
comment How to determine the mass of a quark?
@David: I think a good answer to the question would cover both of our interpretations. I would attempt to do so but I am sure that, before long, someone else will answer it more clearly than I could.
Jul
17
comment How to determine the mass of a quark?
Given that this sounds like a "how do we measure.." question, I would suggest the 'experimental physics' tag. ;-)
Jul
17
comment Poincare group vs Galilean group
Could you perhaps exchange the equation numbers to the equations themselves please?
Jul
16
comment The Ozma Problem
I tend to just look at the back of my hands with my fingers and thumbs straightened, the left hand makes a nice 'L' shape. Not sure this is going to work for those aliens though ;-)
Jul
16
comment Is there any way to increase a rubber-bands lifetime?
OK, can I have some "prizes" please?! I think you meant 'prices' @Georg, +1 for a good answer all the same ;-)
Jul
16
comment Commutation of operators in quantum theory
'Notation' tag might be apt here
Jul
15
comment what is an inverse femto barn?
It's a shame we don't have an awards system such that I could nominate this answer. (+1 needless to say.)
Jul
15
comment real world applications of Mathematics which use functions with singularities, not just as a matter of mathematical taste but for conceptual reasons
I agree with @Zev C: this should be a community wiki.
Jul
12
comment How to predict how much data to collect
I was just getting my head around the details of what you wrote and I have a quick couple of questions, I hope you don't mind. 1/ In the order-of-magnitude estimate are you saying one can take $N_{\rm events}^{-1/2}=f$ and solve for $N_{\rm events}$? I can replicate your "decades" prediction in this way but - where you said "your measurement of a modulation will have an error of order $N_{\rm events}^{-1/2}$" shouldn't it have had a positive power? 2/ What was the motivation for you choice of $\hat B$? I'm afraid I just can't work out where this bit comes from..
Jul
12
comment How to predict how much data to collect
thank you so much for taking the time to answer, this is exactly what I was after, with more detail than I had expected. Thanks again.
Jul
12
comment How to predict how much data to collect
@Ted Bunn: Yes, in theory it would be possible for me to match the collected data (time-stamped detection events) with a known phase. In practice this may be a little more difficult as the phase is not quite constant and would need regular adjustments. Unfortunately the detector will be place in a somewhat hard-to-reach site so the practicalities of accessing it regularly may prevent me doing so. Regarding whether the events are Poisson distributed, I'm not overly familier with the science/stastistics of RVs, but having looked it up I get the feeling that the event rate here most probably is.
Jul
1
comment Show that the electric field E in the system at rest is $E=\frac{Q}{4 \pi \epsilon_0 \sqrt{(x^2+y^2+z^2)^3}} (x,y,z)$
..perhaps. Also, are you sure this shouldn't have had a special-relativity tag instead of GR?
Jul
1
comment Whats the range of dimension exponents in the SI Units system?
A combination of these two pages may be of some use: en.wikipedia.org/wiki/SI_prefix, and en.wikipedia.org/wiki/Dimensional_analysis
Jun
30
comment maximum rotational speed
@Marek's answer in @voix's linked-question seems to answer it for me. Good question all the same :-)
Jun
30
comment how does dynamic casimir effect generate correlated photons
Great question +1. I'm left wondering if measuring the flux of the photons produced could be used as a measure of some part of the vacuum energy spectrum?
Jun
30
comment Does a static electric field and the conservation of momentum give rise to a relationship between $E$, $t$, and some path $s$?
@yayu: indeed, particulry @Andrew's answer and the associated paper. Thanks
Jun
30
comment Does a static electric field and the conservation of momentum give rise to a relationship between $E$, $t$, and some path $s$?
Maybe I'm being stupid but surely if you could consider an object that has no net force acting on it, you would get 0 if you just took any loop integral around it: ∮pho⋅ds=0 What would one call the 'force field' be called though?
Jun
30
comment On a bicycle, why does my back tyre wear so much more quickly than the front?
@bubble: No, it was the incorrect physics that persuaded me.