Space-time translational gauge identities in Abelian Yang-Mills gravity

We derive and calculate the space-time translational gauge identities in quantum Yang-Mills gravity with a general class of gauge conditions involving two arbitrary parameters. These identities of the Abelian group of translation are a generalization of Ward-Takahasi-Fradkin identities and important for general discussions of possible renormalization of Yang-Mills gravity with translational gauge symmetry. The gauge identities in Yang-Mills gravity with a general class of gauge conditions are substantiated by explicit calculations.Comment: 15 pages. To be published in The European Physical Journal - Plus (2012

A Dielectric Flow Solution with Maximal Supersymmetry

We obtain a solution to eleven-dimensional supergravity that consists of M2-branes embedded in a dielectric distribution of M5-branes. Contrary to normal expectations, this solution has maximal supersymmetry for a brane solution (i.e. sixteen supercharges). While the solution is constructed using gauged supergravity in four dimensions, the complete eleven-dimensional solution is given. In particular, we obtain the Killing spinors explicitly, and we find that they are characterised by a duality rotation of the standard Dirichlet projection matrix for M2-branes.Comment: 17 pages; harvma

Regulation in the Taxi Industry.

This paper examines some of the economic reasons for price and entry regulation in the taxi industry and presents the legal framework under which taxis and hire cars are regulated in England and Wales outside London. It is argued that the current law is defective and should be amended to incorporate explicitly the inter-relationship between fares and vehicle numbers such that the regulators have the discretion to choose between a high price/high availability service and a low price/low availability service

Taxi Licensing Policy 1985-1991.

This paper reviews the effects of the 1985 Transport Act in the Taxi Industry, drawing on the results of surveys of local authorities in 1988, 1989 and 1991. Overall, we find that the Transport Act has had limited success in achieving its objectives. In restricted markets, a substantial and increasing licence premium is enjoyed by licence holders. In deregulated districts, we see generally lower standards of quality enforcement and severe shortages of rank capacity. We think the use of passenger working time as the sole intention for determining regulatory policy is likely to perpetuate these problems, and thus a review of regulation is required so that a better compromise between competing objectives can be achieved

Quantum Yang-Mills gravity in flat space-time and effective curved space-time for motions of classical objects

Yang-Mills gravity with translational gauge group T(4) in flat space-time implies a simple self-coupling of gravitons and a truly conserved energy-momentum tensor. Its consistency with experiments crucially depends on an interesting property that an `effective Riemannian metric tensor' emerges in and only in the geometric-optics limit of the photon and particle wave equations. We obtain Feynman rules for a coupled graviton-fermion system, including a general graviton propagator with two gauge parameters and the interaction of ghost particles. The equation of motion of macroscopic objects, as an N-body system, is demonstrated as the geometric-optics limit of the fermion wave equation. We discuss a relativistic Hamilton-Jacobi equation with an `effective Riemann metric tensor' for the classical particles.Comment: 20 pages, to be published in "The European Physical Journal - Plus"(2011). The final publication is available at http://www.epj.or

The 1935 Hsinchu-Taichung Earthquake

The history of natural disasters in Taiwan has frequently been linked to the practice of historical preservation, archival science, oral history, and museum curatorship. All are collectively hallmarks of a broad range of activities that fall under the umbrella of public history. The problem for Taiwan, however, concerns the legitimacy. Taiwan does not have a single national narrative. It has been subjected to waves of colonialism since the seventeenth century and does not presently have a fully post-colonial narrative. The earthquakes discussed in this paper occurred in two different periods of colonisation.  In order to situate the history of earthquakes into a public history discourse, the field of earthquake-based research in Taiwan has to incorporate different audiences and integrate into a much broader understanding. By this, I mean that the present regimental academic disciplines in Taiwan need to be cross disciplinary, especially since public history is by its very nature collaborative. It illuminates a shared authority over a much wider area. It needs to. It is my argument that it is in digital humanities that Taiwanese academics work best in collaboration. Efforts have been made to digitise the personal experiences of those involved in typhoon reconstruction efforts. A natural synergy, therefore, for the understanding of earthquakes, as public history, is to emphasise access and broad participation in the creation of knowledge. Digital humanities enables this. Attention to this is particularly important in historical preservation of particular sites on an island that frequently develops and re-develops brownfield sites

AdS(3) Solutions of IIB Supergravity from D3-branes

We consider pure D3-brane configurations of IIB string theory which lead to supersymmetric solutions containing an AdS$_3$ factor. They can provide new examples of AdS$_3$/CFT$_2$ examples on D3-branes whose worldvolume is partially compactified. When the internal 7 dimensional space is non-compact, they can be identified as supersymmetric fluctuations of higher dimensional AdS solutions and are in general dual to 1/8-BPS operators thereof. We find that supersymmetry requires the 7 dimensional space take the form of a warped U(1) fibration over a 6 dimensional Kahler manifold.Comment: 10 pages, no figure, JHEP3.cls; v3: corrected errors in the published versio