Hence, we will focus this review on axion monodromy inflation as a mechanism of large-field inflation in 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 n s and the fractional tensor mode power r. This makes them ideal candidates for a description in a candidate fundamental theory like string theory. Such large-field models of inflation have a clear need for symmetry protection against quantum corrections. For 60 years the Kaluza-Klein Theory of extra spatial dimensions that we explored in the previous article existed only as a mathematical oddity. Out now on Filth on Acid, the two have recreated the string melody most infamous in Alfred. Moreover, a GUT-scale inflation model has a trans-Planckian excursion of the inflaton scalar field during the observable amount of inflation. Lastly, in string theory one vibrational mode of closed strings must correspond to a graviton, so quantum gravity is an inescapable consequence of the theory. HI-LO and techno giant Reinier Zonneveld continue their collaboration series with ‘ String Theory ‘. For GUT-scale inflation this is strong enough to be potentially visible as a B-mode polarization of the cosmic microwave background (CMB). Our chance to look for such traces is the primordial gravitational wave, or tensor mode signal produced during inflation. Hence, GUT-scale inflation may be our best candidate phenomenon to preserve traces of string-scale dynamics. If this is the case, this is the closest we can possibly get in energy scales to string-scale physics. ![]() The energy scale of inflation can be as high as that of Grand Unification (GUT). ![]() Our possible best hope to do so is a description of inflation in string theory. We wish to connect string-scale physics as closely as possible to observables accessible to current or near-future experiments. This is a short review of string cosmology.
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