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In quantum field theory, the quantum effective action is a modified expression for the classical action taking into account quantum corrections while ensuring that the principle of least action applies, meaning that extremizing the effective action yields the equations of motion for the vacuum expectation values of the quantum fields.
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The construction of an effective field theory accurate to some power of / requires a new set of free parameters at each order of the expansion in /. This technique is useful for scattering or other processes where the maximum momentum scale k {\displaystyle \mathbf {k} } satisfies the condition | k | / M ≪ 1 {\displaystyle |\mathbf {k} |/M\ll ...
By Anthony Deutsch. AMSTERDAM (Reuters) -The head of the chemical weapons watchdog said on Thursday he would ask Syria's new leaders to grant investigators access to the country to continue work ...
The U.S. Marshals Service in the District of Nevada issued a plea for help and additional reward money to find a man wanted for killing his girlfriend during an argument a year and a half ago in ...
Donna Massey mourns the loss of her daughter, Sonya Massey, who was fatally shot in her home by a Sangamon County sheriff's deputy on July 6, 2024.
Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books.