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BEGIN:VEVENT
DTSTAMP:20260815T210409Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100210T150000Z
DTEND:20100210T160000Z
UID:event605@bu.edu
URL:http://physics.bu.edu/internal/events/show/605
SUMMARY:Lost cousins: Gell-Mann--Low renormalization group and Pad approxim
	ation
DESCRIPTION:Featuring Vanja Dunjko\, University of Massachusetts\, Boston\n
	\nPart of the Condensed Matter Theory Seminar Series.\n\nAbstract: In the s
	ingle-variable case\, Gell-Mann--;Low renormalization group (GLM RG)\nrequi
	res no special symmetries and is thus a purely formal method for improving\
	nconvergence properties of series expansions. In fact\, up to a series reve
	rsion\,\nit is a type of integral Hermite-Pad approximation. It is especial
	ly useful\nfor interpolating between expansions for small values of a varia
	ble and a\nscaling law of known exponent for large values. As an example\, 
	we extract the\nscaling-law prefactor for the one-body density matrix of th
	e Lieb-Liniger gas.\nUsing a new result for the 4th-order term in the short
	-distance expansion\, we\nfind a remarkable agreement with known ab initio 
	numerical results.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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