As a compelling pattern for the holographic principle, our covariant entropy bound conjecture is proposed for more general dynamical horizons. Then we apply our conjecture to ΛCDM cosmological models, where we find it imposes a novel upper bound 10 on the cosmological constant for our own universe by taking into account the dominant entropy contribution from super-massive black holes, which thu...

Each year, AAAI’s National Conference on Artificial Intelligence honors a handful of papers that exemplify high standards in exposition and pedagogy. Papers are nominated for the Best Written Paper Award by members of the program committee during the NCAI review process. These nominations are then reviewed once again by a smaller subset of the program committee to select a winning paper and hon...

An earlier draft of this paper was presented at theAFEE/ASSA “Panel, Policy Implications of the Great Recession” in Chicago in January, 2012 and at Trinity College in Dublin in April, 2012. I am grateful for the comments of the discussant former Brazilian finance minister Louis Carlos Bresser Pereira, members of the audience and fellow panelists Robert Wade, Nina Shapiro, Malcolm Sawyer, and Wi...

IT is well for doctors as for all mankind to *pause occasionally in their pursuits and meditate upon the achievements of the past, the trends of the present, and aims for the future. It was doubtless with this purpose in mind that the founders of the Massachusetts Medical Society set apart an hour at each yearly meeting for an Annual Discourse. In attempting to prepare myself for the honorable ...