Twisting type-N vacuum fields with a group H 2

Twisting, type-N vacuum gravitational fields with symmetries.

Twisting the N = 2 String 1

The most general homogeneous monodromy conditions in N=2 string theory are classified in terms of the conjugacy classes of the global symmetry group U(1, 1)⊗Z2. For classes which generate a discrete subgroup Γ, the corresponding target space backgrounds C/Γ include half spaces, complex orbifolds and tori. We propose a generalization of the intercept formula to matrix-valued twists, but find mas...

Neutrinos with mixing in twisting magnetic fields.

Transitions in a system of neutrinos with vacuum mixing and magnetic moments, propagating in matter and transverse magnetic field, are considered. It is shown that in the realistic case of magnetic field direction varying along the neutrino path qualitatively new phenomena become possible: permutation of neutrino conversion resonances, appearance of resonances in the neutrino-antineutrino (νlL ...

N ov 2 00 2 NEW TECHNIQUES FOR ANALYSING AXISYMMETRIC GRAVITATIONAL SYSTEMS . 1 VACUUM FIELDS

A new framework for analysing the gravitational fields in a stationary, axisymmetric configuration is introduced. The method is used to construct a complete set of field equations for the vacuum region outside a rotating source. These equations are underdetermined. Restricting the Weyl tensor to type D produces a set of equations which can be solved, and a range of new techniques are introduced...

the past hospitalization and its association with suicide attempts and ideation in patients with mdd and comparison with bmd (depressed type) group

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