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The issue of unitarity of the string scattering amplitudes also plays a
key role in the leap to extra space dimensions. However, with
macro-quantum ODLRO from the tachyon vacuum instability we lose
unitarity and the Born probability interpretation implying signal
nonlocality (A. Valentini) AKA "retro-causality." This is then
consistent with Hawking's original position on information loss down
black holes before he, wrongly IMHO, changed his mind in his 2004 Dublin
GR 17 talk. Since Einstein's metric field emerges from the vacuum ODLRO
one also gets a handle on why the Weyl vacuum tensor should encode the
entropy of the gravity field according to S ~ A/4 (Bekenstein).
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