Recent content by argonurbawono

fine. but what about the case of instantons? when you have potential of the form V(x) = \frac{g^2}{8}(x^2-a^2)^2, the potential looks different in euclidean and minkowski. in minkowski you have two wells and classically the particle is either on the right or on the left. but in euclidean...

i am learning path integral for quantum field theory, and my professor used euclidean time (imaginary time) and most textbooks use minkowski time. does actually changing the time from real (minkowski) into euclidean (imaginary) CHANGE the physics in some way?

is there an exact solution to dy/dx = -x - y i am doing a modelling, and just happen to get stumbled into this form of pde. i do it numerically, but i also want to know how y behave as x approaches large value. i just need to present some analytical work to justify what happen as x...

i am taking advanced solid state course, and my professor use marder textbook, and his lecture notes are just like complete copy of marder's textbook. i myself find marder's book very confusing, even things which i already understand are presented in complicated way. i feel i cannot absorb...

hi. i am looking for a free symbolic maths program like mathematica or maple. of course with less functionalities if it is free. but i don't need much apart from integration, series, and maybe a bit of matrix algebra. simple, small and light. can't find it with google yet. do you know...

wow... I've checked it. so Earth atmosphere is actually just doing the same thing ...

once i looked at short video clip of Jupiter atmosphere. i have questions in mind: 1. why the atmosphere seems to travel at different speed making up a number of sliding rings?why don't they travel together? 2. what makes the pattern of turbulence so huge? i think we need such an incredible...

I use marder's book. i think the presentation is very challenging. hard even for graduate students. my professor always get tutorial questions from marder's book, and they are so damn hard. just look at the exercises at the end of each chapter.

btw if you buy a pc today, and use it non-stop everyday, how many years does it take normally for the chips, transistors (and all p-n junctions) to get "corroded" by the fluctuating microcurrent? because these streams of electrons eventually destroy the band structure of the material won't it...

as my limited understanding goes, there is no classical limit on entanglement. it is not like energy or paths, but it is just entangled state for example when two photons produced by the same source interact and separate. one you measure one photon, then the state of the other collapse too...

hi. i am also learning path integral and introduction to field theory, but somehow i don't like the lectures. i don't read books but only lecture notes. it covers path integral for boson and fermions, dirac field. i think i will fail this module... if you guys can learn these stuff just from...

i see. thanks.

sometimes i think, would the pauli exclusion principle still apply if the fermions span a very large spatial distance? for example if i have a very very loooong chain of condensed electrons, wouldn't it be possible that the electrons at both ends occasionaly occupy the same quantum state?

thanks. i feel it is very strange that gravitational force can be observed in that way. if it were just an experiment proposal, i would definitely say it wouldn't work.

will i damage my credit card if i put it on top of a strong magnet? i have a few smart cards together with my credit cards in my wallet. when i use my smart card (like a security access card to open doors, gates with electronic access) i tap my wallet on the reading pad which i believe is...