Homogeneous Lorentzian manifolds of a semisimple group

We describe the structure of $d$-dimensional homogeneous Lorentzian $G$-manifolds $M=G/H$ of a semisimple Lie group $G$. Due to a result by N. Kowalsky, it is sufficient to consider the case when the group $G$ acts properly, that is the stabilizer $H$ is compact. Then any homogeneous space $G/\bar H$ with a smaller group $\bar H \subset H$ admits an invariant Lorentzian metric. A homogeneous manifold $G/H$ with a connected compact stabilizer $H$ is called a minimal admissible manifold if it admits an invariant Lorentzian metric, but no homogeneous $G$-manifold $G/\tilde H$ with a larger connected compact stabilizer $\tilde H \supset H$ admits such a metric. We give a description of minimal homogeneous Lorentzian $n$-dimensional $G$-manifolds $M = G/H$ of a simple (compact or noncompact) Lie group $G$. For $n \leq 11$, we obtain a list of all such manifolds $M$ and describe invariant Lorentzian metrics on $M$

Jet Studies in STAR via Di-jet Triggered (2+1) Multi-hadron Correlations

We explore jet-medium interactions via the recently developed multi-hadron correlation or "2+1" technique. We restrict the di-jet kinematics by selecting a pair of approximately back-to-back high pT hadron triggers and study associated particles. Here we present our study of di-jet systematics comparing the measurements of associate yields and spectra in 200 GeV Au+Au and d+Au collisions in two different scenarios. We present Sum(pT) as an estimate for energy loss. First findings indicate little to no energy loss in the symmetric "2+1" scenario whereas model predictions are about 2 GeV.Comment: 4 pages, 3 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennesse

Urban Land Reform Briefing Paper No 2: Explaining the Housing Land Corporation

This is one of six briefing papers prepared by Professor David Adams of the University of Glasgow to help explain key proposals for urban land reform made in 2014 by the Scottish Government’s Land Reform Review Group (LRRG) to whom he acted as an independent adviser. This paper focuses on the LRRG’s recommendations that to achieve the Scottish Government’s national housebuilding targets and place-making aspirations requires “the establishment of a Housing Land Corporation, a new national body charged with the acquisition and development of sufficient land” and that the Corporation “should have explicit performance targets that recognise the specific needs of small rural communities and an extended operational role to enable these to be addressed” (see pages 132-141 of the LRRG report)

Elizabeth I, the Succession and Foreign Policy

Part of a special section on the reign of Queen Elizabeth I of England. The writer examines the close links between Elizabeth's ascendancy, reign, and subsequent relationships with the states of Europe. Elizabeth had a coherent foreign policy, shaped by the unusual circumstances of her reign. These were less to do with her gender--a much-exaggerated subject--than her questionable legitimacy and the coincidence that the leading members of the wider Tudor royal family were Scots. For example, until her death in 1587, Mary Stuart was the focus around which Elizabeth's foreign policy revolved. Mary was Dauphine and, after July 1559, Queen of France, and the threat of her rival claim to the English throne was the decisive motive for Elizabeth's interventions in Scotland in 1560 and France in 1562

Urban Land Reform Briefing Paper No 1: Explaining Compulsory Sale Orders

This is one of six briefing papers prepared by Professor David Adams of the University of Glasgow to help explain key proposals for urban land reform made in 2014 by the Scottish Government’s Land Reform Review Group (LRRG) to whom he acted as an independent adviser. This paper focuses on the LRRG’s recommendations “that further mechanisms are required to address the persistent challenge of vacant and derelict land in urban areas” and “that Local Authorities should have the right to exercise a Compulsory Sale Order over an area of vacant or derelict land, and also that Community Councils, or appropriate community bodies, should have the right to request that a local authority exercises a Compulsory Sale Order” (see pages 103 and 122-124 of the LRRG report)