Ph Martineau

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We analyse the cosmological implications of brane-antibrane systems in string-theoretic orbifold and orientifold models. In a class of realistic models, consistency conditions require branes and antibranes to be stuck at different fixed points, and so their mutual attraction generates a potential for one of the radii of the underlying torus or the 4D string(More)
We study the classical stability of a class of S-brane geometries having cosmological horizons. By considering the perturbations of the metric in these ge-ometries we establish that their horizons are unstable in the sense that an observer trying to cross the horizon experiences an infinite flux of radiation at the instant of crossing. The backreaction of(More)
During the last years, the interest in maritime surveillance has been growing up, and spaceborne SAR systems may contribute to the improvement of security and safety at sea. As such, to allow observation of non-cooperative boats with revisit times compatible with the objectives of reactivity of maritime surveillance, the solutions proposed by CNES (French(More)
We study the bound states of brane/antibrane systems by examining the motion of a probe antibrane moving in the background fields of N source branes. The classical system resembles the point-particle central force problem, and the orbits can be solved by quadrature. Generically the antibrane has orbits which are not closed on themselves. An important(More)
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