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3 days ago · The relativistic Lagrangian can be derived in relativistic mechanics to be of the form: Although, unlike non-relativistic mechanics, the relativistic Lagrangian is not expressed as difference of kinetic energy with potential energy, the relativistic Hamiltonian corresponds to total energy in a similar manner but without including rest energy.
3 days ago · At speeds that are a substantial fraction of the speed of light, the framework of Newtonian mechanics no longer suffices to describe many physical phenomena. Instead, one must start to take into account Einstein's theory of special relativity, which deals with the "special" case of physics in the absence of gravity. The more "general" case of general relativity takes ...
2 days ago · Special relativity is beyond weird. Among its many statements are that moving clocks run slow and that moving rulers shrink. ... When electric charges are set in motion, their electric fields ...
2 days ago · Alternatives to general relativity are physical theories that attempt to describe the phenomenon of gravitation in competition with Einstein's theory of general relativity. There have been many different attempts at constructing an ideal theory of gravity. These attempts can be split into four broad categories based on their scope.
3 days ago · A new theory of quantum gravity, which attempts to unite quantum physics with Einstein's relativity, could help solve the puzzle of the universe's expansion, a theoretical paper suggests.
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Quantum mechanics [QM] is a branch of physics which describes physical systems so that properties like the energy or angular momentum are discrete quantities that are multiples of a smallest unit or quantum. A famous physicist named Erwin Schrödinger made an example of quantum mechanics, often called Schrödinger's cat. It illustrates what he saw as the problem of the Copenhagen ...
4 days ago · A subsequent paper of Einstein (1917) applies the theory of general relativity to cosmology, and in fact represents the birth of modern cosmology.In it, Einstein looks for models of the entire universe that satisfy his equations under suitable assumptions about the large-scale structure of the universe, such as its “homogeneity,” meaning that space-time looks the same in any part as any ...
