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Emission of Axions in strongly magnetized star
We show that the axion decay constant does not get any correction at any
order by external magnetic fields. On the other hand, in the context of the
Wilsonian effective action under external magnetic fields, the axial currents
get a finite correction. We then calculate the effect of strong magnetic fields
on the axion-nucleon coupling and find that if in strongly magnetized neutron and white dwarf stars, the emission
rate of axions is enhanced by several orders of magnitude.Comment: 11 pages, RevTeX, 4 Postscript figures, uses epsf.st
The SL(K+3,C) Symmetry of the Bosonic String Scattering Amplitudes
We discover that the exact string scattering amplitudes (SSA) of three
tachyons and one arbitrary string state, or the Lauricella SSA (LSSA), in the
26D open bosonic string theory can be expressed in terms of the basis functions
in the infinite dimensional representation space of the SL(K+3,C) group. In
addition, we find that the K+2 recurrence relations among the LSSA discovered
by the present authors previously can be used to reproduce the Cartan
subalgebra and simple root system of the SL(K+3,C) group with rank K+2. As a
result, the SL(K+3,C) group can be used to solve all the LSSA and express them
in terms of one amplitude. As an application in the hard scattering limit, the
SL(K+3,C) group can be used to directly prove Gross conjecture [1-3], which was
previously corrected and proved by the method of decoupling of zero norm states
[4-10].Comment: 19 pages, no figure. v2: 20 pages, typos corrected and Eqs. added.
v3: 24 pages, Examples in sec. II added,"Discussion" added, to be published
in Nucl.Phys.
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