Recent content by Euphemia

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    Graduate One family of fermions SU(2)LXU(1)

    Hello, all If now I only have one family of fermions (a neutrino, a charged lepton, an up-type quark and a down quark), what is going to change of the Lagragian and also the Feynman rules of SU(2)LXU(1) electroweak theory? Euphemia
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    Graduate Derivation of the geodesic equation from the Lagrangian

    The bigger words is the main description. The smaller words is my own work, I don't know if I get the wrong Christoffel connections or something else.
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    Graduate Derivation of the geodesic equation from the Lagrangian

    http://mykomica.org/boards/shieiuping/physics/src/1335180831965.jpg http://mykomica.org/boards/shieiuping/physics/src/1335180965708.jpg
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    Graduate Recommended books on nonlinear physics

    My apology! Classical Dynamics, electron correlation and applied mathematics
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    Graduate Recommended books on nonlinear physics

    Hi, all Would you guys recommend some books on the subject of nonlinear physics? And how is the recent progress about it and its related fields? Thanks!
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    Undergrad Spontaneous Process and Irreversibility

    Hi,all My problem is following this picture! http://mykomica.org/boards/shieiuping/physics/src/1325318780058.jpg If the system is isolated, dQ is always zero. Sb-Sa ≥0 And it satisfies the requirement of spontaneousness in isolated systems. So ,I do wonder if irreversible process is always...
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    Graduate Why use second quantization and field operators

    Hi,all What is the motivation of using Second Quantization ? What kind of situation does people want to use field operators ? Euphemia
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    Undergrad Is DFT Still the Go-To Method for Electronic Structure Calculations?

    Thanks a lot You are really thoughtful!
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    Undergrad Is DFT Still the Go-To Method for Electronic Structure Calculations?

    That's a fair point. Thank you for your notification. I am fascinated by the original idea of DFT, but this theory turns out not really work very well and become very messy. I still want to give it a shot! Since I'm still an undergraduate, there is no need to be hurry to settle down.
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    Undergrad Is DFT Still the Go-To Method for Electronic Structure Calculations?

    Ya, you're probably right. But I think the theory still not complete yet! There are a lot of fine models, and none of them is really based on the first principle. So I guess there is still something I can do!
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    Undergrad Is DFT Still the Go-To Method for Electronic Structure Calculations?

    Hi,all Is there someone's research related to DFT? I'm an undergraduate trying to get into it. I hope I could get some help hear if I have any question about that! Thanks a lot,Euphemia
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