| 41. | Correlation functions describe how microscopic variables, such as spin and density, at different positions are related.
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| 42. | Where h ( r ) and c ( r ) are the indirect and direct correlation functions respectively.
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| 43. | Thus a symmetry in the Hamiltonian becomes a symmetry of the correlation function ( and vice versa ).
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| 44. | Asymptotics of correlation functions ( even for space, time and temperature dependence ) were evaluated in 1991.
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| 45. | Correlation functions of local operators living on the boundary of AdS are the natural analogues of scattering amplitudes.
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| 46. | This allows, for example, the partition function to be used as a generating function for correlation functions.
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| 47. | A more general definition for photon antibunching concerns the slope of the correlation function away from zero time delay.
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| 48. | The second, the indirect correlation function, accounts for the effects of a third particle in a system.
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| 49. | Schwinger's foundational work on quantum field theory constructed the modern framework of field correlation functions and their anomalies.
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| 50. | This is discussed below in the section on the temporal evolution of correlation functions and Onsager's regression hypothesis.
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