Tim Berners-Lee and academia have created the Web Science Research Institute.
What appears to be a related publication is 'A Framework for Web Science'.
I find it strange that in a paper of 130 pages that purports to describe the Web and how it works, there are only 13 references to identity.
And no references at all to any of SAML, Liberty Alliance, OpenID, SSO, user-centric, federation, Cardspace, etc.
Perhaps all the work has been done in identity and so there need be no further research? As opposed of course to that frenzy of real-world implementation that is the Semantic Web.