Yvan Velenik

1,336 reputation

314

bio	website	unige.ch/math/folks/velenik
	location	Geneva, Switzerland
	age	43
visits	member for	1 year
	seen	42 mins ago
stats	profile views	100

Professor at the Mathematics department of the University of Geneva. Mostly working at the intersection of probability theory and statistical physics.

	1,336 reputation	bio	website	unige.ch/math/folks/velenik	visits	member for	1 year
314 badges		location	Geneva, Switzerland		seen	42 mins ago

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Mar 4	answered	Is there a formal definition of a macroscopic variable in statistical mechanics?
Feb 16	comment	How do we make symmetry assumptions rigorous? @Hayeder: I just meant that the set of all solutions is left invariant under the action of the symmetry group (applying the transformation on one solution yields another solution).
Feb 13	comment	How do we make symmetry assumptions rigorous? Of course, in simple situations, like here, uniqueness is not difficult to establish. But, in any case, this is a prerequisite.
Feb 13	comment	How do we make symmetry assumptions rigorous? @TMS: the solutions to a problem with symmetry are not themselves symmetric in general. The only case in which this is guaranteed is when the solution is unique. What's always symmetric is the set of solutions, not the solutions themselves.
Feb 12	comment	How do we make symmetry assumptions rigorous? Well, this is just be wrong in general: what's true is that symmetry+uniqueness of the solution imply that the solution is symmetric...
Feb 7	comment	Partition function of a gas of $N$ identical classical particles Read, for example, this paper: link.springer.com/article/10.1023%2FA%3A1015161825292?LI=true .
Feb 7	comment	Semiflexible discrete polymer chain Seems equivalent to asking the magnetization of a classical XY chain. This is certainly well known (and probably amenable to a transfer matrix computation). Or am I missing something?
Jan 19	comment	Why is there something rather than nothing? @Manishearth: I actually think that this is as good an answer as can be provided to this question. Any scientific explanation will have to rely on some general laws, and then the question would indeed become "but why do these laws hold?".
Dec 12	comment	The strong Markov property of Gibbs measures in 2D Ising Model @Elias: Thanks for the comment regarding the reward on math.stackexchange, but I really do not care much about my "score" ;) .
Dec 12	comment	The strong Markov property of Gibbs measures in 2D Ising Model @Elias: I've added some additional explanations in a simpler settings. If this does not clarify the issue, then just tell me...
Dec 12	revised	The strong Markov property of Gibbs measures in 2D Ising Model added 1869 characters in body
Dec 11	comment	The strong Markov property of Gibbs measures in 2D Ising Model @Elias: of course, if you need additonal informations, don't hesitate to ask (it is never clear to what level of details one needs to go, and it also very much depends on where the confusion lies). You might also do that by email, my adress can be found on my homepage.
Dec 10	revised	The strong Markov property of Gibbs measures in 2D Ising Model added 7 characters in body
Dec 10	revised	The strong Markov property of Gibbs measures in 2D Ising Model Added refs to recent alternative approaches
Dec 10	revised	The strong Markov property of Gibbs measures in 2D Ising Model Slightly simplified
Dec 10	revised	The strong Markov property of Gibbs measures in 2D Ising Model Small correction
Dec 10	answered	The strong Markov property of Gibbs measures in 2D Ising Model
Dec 3	awarded	Caucus
Nov 21	comment	Where can I get Young & Freedman University Physics 13th Edition Instructor's Solution Manual? No, this is probably not the right place to ask. Downloading books from sites such as en.bookfi.org is illegal and you should of course not do that (even though it seems that it contains the book you need).
Oct 24	comment	What is a bulk phase transition? @kηives: Yes, this is by opposition to, e.g., surface phase transitions. A typical example of the latter is the wetting transition.