meta user
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| bio | website | |
|---|---|---|
| location | London, United Kingdom | |
| age | 28 | |
| visits | member for | 2 years, 4 months |
| seen | Dec 3 '12 at 15:05 | |
| stats | profile views | 234 |
Phd student
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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.) |
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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? ;-) |
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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' |
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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. |
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Jul 26 |
revised |
When will the Hubble volume coincide with the volume of the observable Universe? edited body; edited tags |
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Jul 26 |
revised |
When will the Hubble volume coincide with the volume of the observable Universe? edited tags |
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Jul 26 |
asked | When will the Hubble volume coincide with the volume of the observable Universe? |
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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/… |
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Jul 26 |
asked | Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper? |
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Jul 21 |
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What conservation law corresponds to Lorentz boosts? Nice warning at the start ;-) (+1) |
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Jul 21 |
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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. |
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Jul 21 |
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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 ;-) |
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Jul 20 |
revised |
Decay of massless particles Clarified scope of answer |
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Jul 20 |
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Decay of massless particles @Bebop: Good point, not sure why I only considered decay to massive particles. I'll edit the answer accordingly. |
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Jul 20 |
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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. |
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Jul 20 |
revised |
Decay of massless particles Expanded for clarity |
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Jul 20 |
answered | Decay of massless particles |
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Jul 19 |
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How to determine the mass of a quark? I hereby promise to upvote a comprehensive, "enormously long answer" alluded to in @Genneth's comment. ;-) |
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Jul 18 |
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How to determine the mass of a quark? +1 for the links to the pdg. |
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Jul 18 |
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what is the difference between a blackhole and a point particle Possibly related: physics.stackexchange.com/questions/9529/… |
