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bio website marcofrasca.wordpress.com
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visits member for 2 years, 4 months
seen Apr 7 at 5:51
I am a theoretical physicist working in the area of quantum field theory, mostly QCD and gauge theories. I am also interested on techniques of solution of PDEs. An incomplete list of my publications can be found on arXiv. Most of these papers appeared in refereed journals.

Mar
11
comment Green function and translational symmetry
Did you mean "there is no way to reconstruct $\phi(t)$ ..."?
Mar
11
comment Green function and translational symmetry
Thanks Carlo. I think that this is the main point. but can I start from $G(t,0)$ to reconstruct in some way $G(t,t')$?
Mar
11
asked Green function and translational symmetry
Feb
17
comment Solvable PDEs and their Green's functions
@CarloBeenakker: It could be having an analytical solution to compare with. Indeed, this seems the case.
Feb
17
asked Solvable PDEs and their Green's functions
Dec
28
comment Differentiable functions with discontinuous derivatives
My personal view is that the question OP put forward is in the wrong forum. So, unsatisfactory answers are obtained unless a mathematical-minded reader is concerned. I think that, for the sake of completeness, he should look in physics.stackexchange.com where a more appropriate audience can yield the answer he is looking for.
Dec
25
comment Differentiable functions with discontinuous derivatives
Of course, any Green function of the Schroedinger equation does. E.g., for a free particle you will get $t^{-\frac{1}{2}}e^{i\frac{x^2}{2t}}$ but there is plenty of cases. So, starting from Green functions like these you just have a choice to do in perturbation theory. I was also considering a two-level system but with a different parameter rather than time. Dependence on coupling in quantum field theory or just quantum mechanics in perturbation theory generally have the property you are looking for.
Dec
24
comment Differentiable functions with discontinuous derivatives
Indeed, there are a lot of examples coming from perturbation theory applied in physics. So, I have to agree with the comment by Alexandre Eremenko.
Nov
25
awarded  Yearling
Oct
19
comment Inverse problems for an asymptotic series which depends on a parameter?
@j.c.:Indeed, that is the obvious solution: $a_n=\delta_{n,0}$ with $\nu\rightarrow 0$.
Oct
15
comment What's the asymptotic behavior of this function at large distance?
Thanks, just fixed.
Oct
15
revised What's the asymptotic behavior of this function at large distance?
Fixed a formula
Oct
15
answered What's the asymptotic behavior of this function at large distance?
Oct
7
revised What's the name of this distribution
Formatted LaTeX
Oct
7
suggested suggested edit on What's the name of this distribution
Oct
1
answered A nonlinear initial-boundary value problems with Taylor expansion of parameter
Sep
30
awarded  Caucus
Sep
24
revised Asymptotic solution of the integral equation
Rephrasing
Sep
24
answered Asymptotic solution of the integral equation
Sep
24
comment Asymptotic solution of the integral equation
The paper cited by OP can be freely downloaded at dept.math.lsa.umich.edu/~abloch/RollingSpheres17.pdf.