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The multiloop covariant tadpole operator and amplitudes for the bosonic string
Institution:NORDITA, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark;Dipartimento di Scienze Fisiche, Università di Napoli and INFN, Sezione di Napoli, I-80125 Naples, Italy
Abstract:An explicit expression is given for the covariant tadpole operator with an arbitrary number of loops, including the ghost zero mode contribution. Its integrand is recast in geometrical terms and is recognized to give the g-vacuum for the bosonic string recently discussed in the literature. By joining the g-tadpole to an N-reggeon vertex the general orientable dual amplitude with g loops is obtained.
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