Titlebook: Introduction to String Theory; Sergio Cecotti Textbook 2023 The Editor(s) (if applicable) and The Author(s), under exclusive license to Sp

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SUSY Strings at Strong Couplingry or by a new quantum system, living in 11 dimensions, called M-theory. The five 10d superstrings and M-theory are connected by a rich web of dualities. 10d IIB has a . group of auto-dualities mapping strong to weak coupling. Strongly coupled IIB is dual to weakly coupled IIB with the fundamental s

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Sergio Cecottilogies, systems, techniques, and applications. It is a comprehensive collection of entries that present perspectives and future trends in the field from hundreds of leading researchers and world experts in the field. These entries describe a number of topics in multimedia systems and applications –

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Introducing Strings: The Polyakov Path Integralse theories is two-dimensional conformal field theory which is the subject of the following chapter. In the last two sections, we discuss the relation of the quantum amplitudes computed by the Polyakov integral with physical observables in possibly curved spacetimes and non-trivial backgrounds.

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The Heterotic Stringthe toroidal compactifications of these theories, their dualities, and equivalences. We also discuss the non-SUSY heterotic strings, and in particular the tachyon-free one with gauge group .. Finally we describe the BPS states of the SUSY heterotic strings. In the . the . superstring is briefly reviewed.