Titlebook: Relativistic Quantum Mechanics and Introduction to Field Theory; Francisco J. Ynduráin Textbook 1996 Springer-Verlag Berlin Heidelberg 199

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s and for characterizing the mechanical behavior of crack-free or cracked solids. Clearly, the latter have a different mechanical behavior than the former, and it is characterized according to the principles of fracture mechanics, which are divided into two areas. Linear-elastic fracture mechanics (

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Theoretical and Mathematical Physicshttp://image.papertrans.cn/r/image/826238.jpg

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The Klein-Gordon Equation. Relativistic Equation for Spinless Particles,When Schr?dinger developed his nonrelativistic wave equation, he also proposed a relativistic generalization. This equation, studied in greater detail by Klein and Gordon (whose name it now bears) can be immediately obtained from the relation (1.7.4) for a free particle, . with the substitutions suggested by the correspondence principle,

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Relativistic Collisions in Field Theory. Feynman Rules. Decays,The initial and final states for this process are, . where the η are the helicities of the photons and we define photon states without a factor ., as we did for electron states. The interaction Hamiltonian is still given by (10.4.1). In the Born approximation,

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