000220895 001__ 220895 000220895 005__ 20250717105454.0 000220895 0247_ $$2doi$$a10.1142/S0217751X15300240 000220895 0247_ $$2inspire$$ainspire:1317862 000220895 0247_ $$2altmetric$$aaltmetric:2696251 000220895 0247_ $$2WOS$$aWOS:000351729100002 000220895 0247_ $$2openalex$$aopenalex:W3106094471 000220895 037__ $$aPUBDB-2015-02434 000220895 041__ $$aEnglish 000220895 082__ $$a530 000220895 088__ $$2DESY$$aDESY-14-149 000220895 0881_ $$aDESY-14-149 000220895 1001_ $$0P:(DE-H253)PIP1013212$$aWestphal, Alexander$$b0$$eCorresponding author 000220895 245__ $$aString cosmology — Large-field inflation in string theory 000220895 260__ $$aSingapur$$bWorld Scientific Publ.$$c2015 000220895 3367_ $$2DRIVER$$aarticle 000220895 3367_ $$2DataCite$$aOutput Types/Journal article 000220895 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1600350953_32376 000220895 3367_ $$2BibTeX$$aARTICLE 000220895 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000220895 3367_ $$00$$2EndNote$$aJournal Article 000220895 500__ $$a34 pages, 1 figure, LaTeX, to be published in 'Perspectives in String Phenomenology' 000220895 520__ $$aThis is a short review of string cosmology. We wish to connect string-scale physics as closely as possible to observables accessible to current or near-future experiments. Our possible best hope to do so is a description of inflation in string theory. The energy scale of inflation can be as high as that of Grand Unification (GUT). If this is the case, this is the closest we can possibly get in energy scales to string-scale physics. Hence, GUT-scale inflation may be our best candidate phenomenon to preserve traces of string-scale dynamics. Our chance to look for such traces is the primordial gravitational wave, or tensor mode signal produced during inflation. For GUT-scale inflation this is strong enough to be potentially visible as a B-mode polarization of the cosmic microwave background (CMB). Moreover, a GUT-scale inflation model has a trans-Planckian excursion of the inflaton scalar field during the observable amount of inflation. Such large-field models of inflation have a clear need for symmetry protection against quantum corrections. This makes them ideal candidates for a description in a candidate fundamental theory like string theory. At the same time the need of large-field inflation models for UV completion makes them particularly susceptible to preserve imprints of their string-scale dynamics in the inflationary observables, the spectral index ns and the fractional tensor mode power r. 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