https://www.selleckchem.com/pr....oducts/blasticidin-s
We compute the cosmological reduction of the fourth powers of the Riemann tensor claimed to arise in string theory at order α^'^3, with an overall coefficient proportional to ζ(3), and show that it is compatible with an O(9,9) symmetry. This confirms the general result in string theory, due to Sen [O(d)×O(d) symmetry of the space of cosmological solutions in string theory, scale factor duality and two-dimensional black holes, Phys. Lett. B 271, 295 (1991)PYLBAJ0370-269310.1016/0370-2693(91)90090-D], that classical string theor
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