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Exchange-diffusion Monte Carlo

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Diffusion quantum Monte Carlo is a formally exact way to treat many-body quantum systems. Unfortunately, for electronic systems it suffers from the so-called fermion sign problem. In this talk I will demonstrate how the sign problem arises in a formally exact implementation of fermionic diffusion Monte Carlo. I will go on to demonstrate how this exercise informs the construction of alternative approximate (but asymptotically exact) methods to the popular fixed-node approximation.

This talk is part of the Electronic Structure Discussion Group series.

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Faculty of Education, 184 Hills Road, Cambridge, CB2 8PQ, Donald MacIntyre Building, Room 1S3 Goldsmiths 1 & https://us06web.zoom.us/j/81688365420?pwd=b3RpdHgxNVhWbWQrbXluMUxYNWVtQT09 Meeting ID: 816 8836 5420 Passcode: 047859 FW 11, William Gates Building. Zoom link: https://cl-cam-ac-uk.zoom.us/j/4361570789?pwd=Nkl2T3ZLaTZwRm05bzRTOUUxY3Q4QT09&from=addon

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