Massive Fields of Arbitrary Integer Spin in Symmetrical Einstein Space

We study the propagation of gauge fields with arbitrary integer spins in the symmetrical Einstein space of any dimensionality. We reduce the problem of obtaining a gauge-invariant Lagrangian of integer spin fields in such background to an purely algebraic problem of finding a set of operators with certain features using the representation of high-spin fields in the form of some vectors of pseudo-Hilbert space. We consider such construction in the linear order in the Riemann tensor and scalar curvature and also present an explicit form of interaction Lagrangians and gauge transformations for massive particles with spins 1 and 2 in terms of symmetrical tensor fields.Comment: 15 pages, latex, no figures,minor change

Threat-Based Approach to Risk, Case Study: The Strategic Homeland Infrastructure Risk Assessment (SHIRA)

The culture of risk management is beginning to grow at the Department of Homeland Security (DHS). Created in response to the attacks of September 2001, the Department has as one of its primary missions to protect the nation from terrorism.1 Five years after its creation, and through several reorganizations, DHS still struggles to master risk management with respect to terrorism. Although DHS realized the need for the collaboration of intelligence and security professionals to jointly assess risk at its inception,2 it was not until the formation of the Homeland Infrastructure Threat and Risk Analysis Center (HITRAC) that DHS had a truly integrated approach to terrorism risk analysis

The structure of Green functions in quantum field theory with a general state

In quantum field theory, the Green function is usually calculated as the expectation value of the time-ordered product of fields over the vacuum. In some cases, especially in degenerate systems, expectation values over general states are required. The corresponding Green functions are essentially more complex than in the vacuum, because they cannot be written in terms of standard Feynman diagrams. Here, a method is proposed to determine the structure of these Green functions and to derive nonperturbative equations for them. The main idea is to transform the cumulants describing correlations into interaction terms.Comment: 13 pages, 6 figure