Title Proposed lower bound for the shear viscosity to entropy density ratio in some dense liquidsProposed lower bound for the shear viscosity to entropy density ratio in some dense liquids Author Angilella, G.G.N. March, N.H. Pellegrino, F.M.D. Puccia, R. Faculty/Department Faculty of Sciences. Physics Research group Department of Physics Publication type article Publication 2009Amsterdam, 2009 Subject Physics Source (journal) Physics letters: A. - Amsterdam, 1967, currens Volume/pages 373(2009):10, p. 992-998 ISSN 0375-9601 ISI 000264424200018 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract Starting from relativistic quantum field theories, Kovtun et al. (2005) have quite recently proposed a lower bound ç/s/(4ðkB), where ç is the shear viscosity and s the volume density of entropy for dense liquids. If their proposal can eventually be proved, then this would provide key theoretical underpinning to earlier semiempirical proposals on the relation between a transport coefficient ç and a thermodynamic quantity s. Here, we examine largely experimental data on some dense liquids, the insulators nitrogen, water, and ammonia, plus the alkali metals, where the shear viscosity ç(T) for the four heaviest alkalis is known to scale onto an almost universal curve, following the work of Tankeshwar and March a decade ago. So far, all known results for both insulating and metallic dense liquids correctly exceed the lower bound prediction of Kovtun et al. E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000264424200018&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000264424200018&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000264424200018&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle