3 papers
astro-ph2003
Axion Bremsstrahlung
Elena Melkumova, Dmitry V. Gal'Tsov, Richard Kerner
A new mechanism of cosmic axion production is proposed: axion bremsstrahlung from collisions of straight global strings. This effect is of the second order in the axion coupling co…
hep-th1996
Symmetries of Heterotic String Effective Theory in Three and Two Dimensions
D. V. Gal'tsov
The four-dimensional bosonic effective action of the toroidally compactified heterotic string incorporating a dilaton, an axion and one vector field is studied on curved spa…
gr-qc1996
Hidden Symmerties in Dilaton--Axion Gravity
D. V. Gal'tsov, O. V. Kechkin
Four--dimensional Einstein--Maxwell--dilaton--axion system restricted to space--times with one non--null Killing symmetry is formulated as the three--dimensional gravity coupled si…