TWORLD

Michiu Kaku on why Einstein is still right, the “faster than light” neutrinos are wrong

Last year, when it appeared that neutrinos had been observed going faster than the speed of light, all hell broke loose in the physics world. Not to worry, here’s Michiu Kaku explaining why you shouldn’t worry.

Submitted by Delsyd

December 21st "You’re an interesting species. An interesting mix. You’re capable of such beautiful dreams, and such horrible nightmares. You feel so lost, so cut off, so alone, only you’re not. See, in all our searching, the only thing we’ve found that makes the emptiness bearable, is each other."
— Carl Sagan (via misswallflower)
(via theandalusiandog)

October 12th

The Epsilon Expansion of Feynman Diagrams via Hypergeometric Functions and Differential Reduction.

gr-qc:

Authors: S.A. Yost, V.V. Bytev, M.Yu. Kalmykov, B.A. Kniehl

Higher-order diagrams required for radiative corrections to mixed electroweak and QCD processes at the LHC and anticipated future colliders will require numerically stable representations of the associated Feynman diagrams. The hypergeometric representation supplies an analytic framework that is useful for deriving such stable representations. We discuss the reduction of Feynman diagrams to master integrals, and compare integration-by-parts methods to differential reduction of hypergeometric functions. We describe the problem of constructing higher-order terms in the epsilon expansion, and characterize the functions generated in such expansions.