615 reputation
515
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location London, United Kingdom
age 29
visits member for 3 years, 7 months
seen Sep 4 at 18:03

Phd student


Oct
11
answered How can I explain why the weak nuclear interaction between individual nucleons is 'weak'?
Aug
4
comment Particle physics plots
Hi Jim: if you search through some of the older posts of this blog you'll find many lucid and pedagogical explanations of particle physics graphs: blog.vixra.org
Jul
29
comment What does scalar phi represent in spacetime?
Can't decide whether I like the clarity or the humour more in this answer: +1 ;)
Jul
28
accepted Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
Jul
28
comment Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
Tim: In light of your above comment defending your answer I have decided it warranted my accepting it. Thanks also to @TheSheepMan for his experimental perspective.
Jul
28
comment When will the Hubble volume coincide with the volume of the observable Universe?
Hi @Ned Wright, thank you kindly for taking the time to answer. I would like to just clarify the conclusion that appears to be drawn from your calculation, namely - that the observable Universe is destined to increase indefinitely, albeit with increasing redshift? This appears to contradict what I read in the aforementioned book by Penrose. On a side note, I opted for the "photist approach" purely as we're a long way from building a high-resolution neutrino or gravitational wave telescope (well, perhaps just decades for the former.)
Jul
27
comment Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
Thanks @TheSheepMan, that sounds like a good method to establish an answer experimentally. Perhaps you would like to transcribe it into an answer and add to it a theoretical estimate that improves upon Tim's effort? ;-)
Jul
26
revised When will the Hubble volume coincide with the volume of the observable Universe?
Clarified 4th sentace to include mention of 'number of galaxies'
Jul
26
comment When will the Hubble volume coincide with the volume of the observable Universe?
@lurscher: Whilst I don't think it answers you query there was another independent varification of DE published recent. Here is a sciam article about it and here is the paper on which it is based.
Jul
26
revised When will the Hubble volume coincide with the volume of the observable Universe?
edited body; edited tags
Jul
26
revised When will the Hubble volume coincide with the volume of the observable Universe?
edited tags
Jul
26
asked When will the Hubble volume coincide with the volume of the observable Universe?
Jul
26
comment Does the Big Bang need a cause?
I was considering offering an answer and then I realised I could just direct you to a lecture entitled 'A Universe From Nothing' by theorist Lawrence Krauss: richarddawkins.net/videos/…
Jul
26
asked Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
Jul
21
comment What conservation law corresponds to Lorentz boosts?
Nice warning at the start ;-) (+1)
Jul
21
comment Is apparent horizon curvature lesser due to refraction of light in the atmosphere?
See the comments by @Philip Gibbs in this question: physics.stackexchange.com/questions/11021/… It's not exactly the same situation but the relevant physics is the same.
Jul
21
comment What conservation law corresponds to Lorentz boosts?
You can answer your own question @Warrick. In fact, I think there's even a badge for that ;-)
Jul
20
revised Decay of massless particles
Clarified scope of answer
Jul
20
comment Decay of massless particles
@Bebop: Good point, not sure why I only considered decay to massive particles. I'll edit the answer accordingly.
Jul
20
comment Decay of massless particles
I agree that the word "radioactive" is superfluous in the question's title. For clarity I think a better title would be 'Can massless particles decay?' but of course the choice is yours.