13,429 research outputs found
Gravitational waves interacting with a spinning charged particle in the presence of a uniform magnetic field
The equations which determine the response of a spinning charged particle
moving in a uniform magnetic field to an incident gravitational wave are
derived in the linearized approximation to general relativity. We verify that
1) the components of the 4-momentum, 4-velocity and the components of the
spinning tensor, both electric and magnetic moments, exhibit resonances and 2)
the co-existence of the uniform magnetic field and the GW are responsible for
the resonances appearing in our equations. In the absence of the GW, the
magnetic field and the components of the spin tensor decouple and the magnetic
resonances disappear.Comment: 19 pages, accepted for publication in Gen. Rel. Gra
A Method to include Detector Effects in Estimators sensitive to the Trilinear Gauge Couplings
This paper describes the use of weighted Monte Carlo events to accurately
approximate integrals of functions of the experimentally measured kinematical
vectors and their dependence on physical parameters. This technique is
demonstrated in estimating the evolution of cross sections, efficiencies,
measured kinematical distributions and mean values as functions of the
Trilinear Gauge Couplings.Comment: 20 pages, 10 figures, Late
Null Strings in Kerr Spacetime
The null string's equations of motion and constraints in the Kerr spacetime
are given. We assume a generic ansatz for the null strings in the Kerr
spacetime and we present the resulting solutions in quadratures. Some specific
string configurations, that follow from the generic one, are considered
separately. In each case we also extract the corresponding solutions in the
Schwarzschild spacetime.Comment: 11 pages, LaTex, no figures, final version to be published in
Phys.Lett.B, references adde
Refugees, trauma and adversity-activated development
The nature of the refugee phenomenon is examined and the position of mental health professionals is located in relation to it. The various uses of the word 'trauma' are explored and its application to the refugee context is examined. It is proposed that refugees' response to adversity is not limited to being traumatized but includes resilience and Adversity-Activated Development (AAD). Particular emphasis is given to the distinction between resilience and AAD. The usefulness of the 'Trauma Grid' in the therapeutic process with refugees is also discussed. The Trauma Grid avoids global impressions and enables a more comprehensive and systematic way of identifying the individual refugee's functioning in the context of different levels, i.e. individual, family, community and society/culture. Finally, I discuss implications for therapeutic work with refugees
Accurate Estimation of the Trilinear Gauge Couplings Using Optimal Observables Including Detector Effects
This paper describes the definition of maximum likelihood equivalent
estimators of the Trilinear Gauge Couplings which include detector effects. The
asymptotic properties of these estimators as well as their unbiasedness and
efficiency when dealing with finite statistical samples are demonstrated by
Monte Carlo experimentation, using simulated events corresponding to the
production of q qbar lepton neutrino in e+ e- collisions at 172 GeV. Emphasis
is given to the determination of the expected efficiencies in extracting the
aWphi, aW and aBphi couplings from LEPII data, which in this particular case
found to be close to the maximum possible.Comment: 32 pages, 12 figures, Late
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