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| bio | website | ratsauce.co.uk |
|---|---|---|
| location | Chester, United Kingdom | |
| age | 52 | |
| visits | member for | 2 years, 4 months |
| seen | 2 hours ago | |
| stats | profile views | 3,091 |
Semi retired old time computer nerd who started programming on a Commodore Pet.
Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.
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1d |
comment |
de Sitter versus Minkowski QFT and cosmological constant Minor quibble: a de Sitter universe contains no matter. Our universe may be evolving towards being approximately de Sitter in the far future, but at the moment it is not a de Sitter universe. |
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2d |
awarded | Nice Question |
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2d |
comment |
Does a charged or rotating black hole change the genus of spacetime? The correct spelling of centre has now been restored :-) |
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2d |
revised |
Does a charged or rotating black hole change the genus of spacetime? rolled back to a previous revision |
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May 16 |
answered | Origin of interaction in inelastic neutron scatting |
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May 16 |
comment |
Asymptotic Freedom - Qualitative Explanation possible duplicate of physics.stackexchange.com/q/45514 |
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May 16 |
answered | Does brown but transparent swimming pool water heat significantly faster than western style highly chlorinated pools? |
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May 16 |
comment |
Gravitational redshift of Hawking radiation physics.stackexchange.com/questions/30597/… is related, though not a duplicate. I'm not sure I understand this area well enough to hazard an answer rather than just this comment :-) |
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May 16 |
comment |
Gravitational redshift of Hawking radiation It's a bit more complicated than that because the radiation isn't really emitted in the sense that a hot filament emits EM. A distant observer calculates the QFT vacuum to be different to an observer nearer the event horizon, and as a result the distant observer finds the "vacuum" near the horizon to contain a finite particle density - this constitites the Hawking radiation. I'm pretty certain (but wouldn't swear to it) that the Hawking calculation calculates the temperature at infinity. An observer falling freely into the black hole would not see any Hawking radiation even at the horizon. |
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May 15 |
comment |
Gravitational redshift of Hawking radiation The radiation comes from the region just outside the horizon. If you search the site I'm sure something like this has been asked before. |
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May 15 |
answered | what is the density of natural gas at 293K and 700 kPa? |
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May 15 |
answered | Why doesn't soda fizz at high pressure? |
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May 13 |
awarded | Nice Answer |
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May 13 |
comment |
Excluding big bang itself, does spacetime have a boundary? @MoziburUllah: I've edited my answer to respond to your comment. |
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May 13 |
revised |
Excluding big bang itself, does spacetime have a boundary? Respond to comment |
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May 13 |
comment |
Our Universe Can't be Looped? Possible duplicate of Symmetrical twin paradox. |
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May 13 |
answered | Excluding big bang itself, does spacetime have a boundary? |
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May 12 |
answered | 'Negative pressure' counteracting gravity? |
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May 12 |
comment |
How to keep the clock of a spaceship synchronised to the clock of an observer? Possible duplicate: physics.stackexchange.com/q/62222 |
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May 10 |
answered | Reflectivity of a glowing-hot metal surface |
