network profile
| bio | website | physicsnapkins.wordpress.com |
|---|---|---|
| location | Barcelona | |
| age | 39 | |
| visits | member for | 1 year, 4 months |
| seen | Nov 24 '12 at 19:56 | |
| stats | profile views | 19 |
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Jan 19 |
awarded | Yearling |
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May 4 |
awarded | Teacher |
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May 4 |
awarded | Nice Answer |
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May 4 |
awarded | Student |
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May 4 |
awarded | Scholar |
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May 4 |
awarded | Nice Question |
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Jan 31 |
comment |
Random bond Ising model and computational efficiency The basic result, i.e.: that obtaining the random-bond-Ising GS for non-planar lattices is NP-complete, was proved by Barahona in 1982. www.yaroslavvb.com/papers/barahona-on.pdf |
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Jan 31 |
comment |
Reduced density matrices for free fermions are thermal About the relation to the Fulling-Davies theorem, the link that I see is the following. You only get thermalization when a horizon appears (Rindler, Schwartzschild, etc.), which means that you're tracing out some degrees of freedom: those linked to the regions of spacetime that are now disconnected from you. Thermalization is due to this "tracing out", right? |
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Jan 31 |
comment |
Reduced density matrices for free fermions are thermal Luboš, thanks for your answer, but it is not enough. Of course, the density matrix will be the logarithm of "something" (unless it has some zero eigenvalues). The fact that this "something" has this particular form is non-trivial for me, and requires more work. |
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Jan 26 |
asked | Reduced density matrices for free fermions are thermal |
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Jan 19 |
awarded | Supporter |
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Jan 17 |
answered | How can one build a multi-scale physics model of fluid flow phenomena? |
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Jan 15 |
comment |
Analog Hawking radiation The sonic analogue of Unruh effect is fully classical. You can read more about it in G.E. Volovik's book, "The universe in a helium droplet". The $\hbar$ you mention is merely metaphorical. |
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Jan 14 |
answered | Readable books on advanced topics |
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Dec 3 |
comment |
Examples of number theory showing up in physics I wouldn't count it as "engineering". It's more like using physical intuition in order to make a breakthrough in maths. We know the properties the Hilbert-Polya hamiltonian should have, so we whether it might be implemented in a physical system. |
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Sep 16 |
accepted | Does entropy measure extractable work? |
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Sep 16 |
comment |
Does entropy measure extractable work? Yes, I see. But still with the Szilard engine example, I'd like to go further. If I know in which side the particle si, I can extract kT ln(2) of work. If I don't know where the particle is, I can get no work. But, what if I have partial knowledge? Is still Shannon's entropy the answer? |
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Sep 16 |
asked | Does entropy measure extractable work? |
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Sep 15 |
answered | Continuum theory from lattice theory |
