http://hdl.handle.net/2440/302 2013-05-19T17:00:12Z 2013-05-19T17:00:12Z Varghese, Mathai Wu, Siye http://hdl.handle.net/2440/74718 2013-01-03T05:30:21Z 2011-12-31T13:30:00Z

Title: Topology and Flux of T-Dual Manifolds with Circle Actions Author: Varghese, Mathai; Wu, Siye Abstract: We present an explicit formula for the topology and H-flux of the T-dual of a general type II, compactification, significantly generalizing earlier results. Our results apply to T-dualities with respect to any circle action on spacetime X. As before, T-duality exchanges type IIA and type IIB string theories. A new consequence is that the T-dual spacetime is a singular space when the fixed point set XT is non-empty; the singularities correspond to Kaluza-Klein monopoles. We propose that the Ramond-Ramond charges of type II string theories on the singular dual are classified by twisted equivariant cohomology groups. We also discuss the K-theory approach.

2011-12-31T13:30:00Z Zhang, Ying Vitry, Agnes Roughead, Elizabeth E. Ryan, Philip Gilbert, Andrew L. http://hdl.handle.net/2440/61433 2013-01-31T05:10:27Z 2009-12-31T13:30:00Z

Title: Organization and delivery of care: Co-morbidity and the utilization of health care for Australian veterans with diabetes Author: Zhang, Ying; Vitry, Agnes; Roughead, Elizabeth E.; Ryan, Philip; Gilbert, Andrew L. Abstract: Objective To examine the impact of co-morbidity on health service utilization by Australian veterans with diabetes. Methods A retrospective cohort study was undertaken including veterans aged ≥ 65 years dispensed medicines for diabetes in 2006. Data were sourced from the Australian Department of Veterans’ Affairs health claims database. Utilization of preventive health services for diabetes was assessed, including claims for glycated haemoglobin (HbA1c) test, microabuminuria, podiatry services, diabetes care plans, medication reviews, case conferences, general practitioner (GP) management plans and ophthalmology/optometry services. Results Among the 17 095 veterans dispensed medicines for diabetes, more than 80% had four or more co-morbid conditions. Those with a higher number of co-morbidities were more likely to have had claims for optometry/ophthalmology services and podiatry services, but not for other services. Veterans with at least one diabetes-related hospital admission had no more claims for diabetes health services than those who had no diabetics-related hospital admission, except for endocrinology services (relative risk = 1.26, 95% confidence intervals 1.15–1.37). Veterans with dementia were less likely to have had claims for diabetes health services while patients with renal failure were more likely to have had claims for the services. Conclusions Low utilization of preventive diabetes care services is apparent in all co-morbidity groups. Patients with renal failure or dementia used more and less health services resources, respectively. Given the high mean age of this population, there may be valid reasons for the low use, such as competing health demands and patients’ preferences.

2009-12-31T13:30:00Z Varghese, Mathai Melrose, Richard B. Singer, Isadore M. http://hdl.handle.net/2440/57322 2010-12-02T01:29:31Z 2008-12-31T13:30:00Z

Title: The index of projective families of elliptic operators: the decomposable case Author: Varghese, Mathai; Melrose, Richard B.; Singer, Isadore M. Abstract: An index theory for projective families of elliptic pseudodifferential operators is developed under two conditions. First, that the twisting, i.e. Dixmier-Douady, class is in H2(X; Z)[H1(X; Z) H3(X; Z) and secondly that the 2-class part is trivialized on the total space of the fibration. One of the features of this special case is that the corresponding Azumaya bundle can be refined to a bundle of smoothing operators. The topological and the analytic index of a projective family of elliptic operators associated with the smooth Azumaya bundle both take values in twisted K-theory of the parameterizing space and the main result is the equality of these two notions of index. The twisted Chern character of the index class is then computed by a variant of Chern-Weil theory.

2008-12-31T13:30:00Z Brodzki, Jacek Varghese, Mathai Rosenberg, Jonathan Szabo, Richard J. http://hdl.handle.net/2440/51980 2009-11-02T02:15:24Z 2007-12-31T13:30:00Z

Title: D-branes, KK-theory and duality on noncommutative spaces Author: Brodzki, Jacek; Varghese, Mathai; Rosenberg, Jonathan; Szabo, Richard J. Abstract: We present a new categorical classification framework for D-brane charges on noncommutative manifolds using methods of bivariant K-theory. We describe several applications including an explicit formula for D-brane charge in cyclic homology, a realignement of open string T-duality, and a general criterion for cancellation of global worldsheet anomalies.

2007-12-31T13:30:00Z