Moduli backreaction on inflationary attractors

Abstract

We investigate the interplay between moduli dynamics and inflation, focusing on the KKLTscenario and cosmological α-attractors. General couplings between these sectors can induce a significant backreaction and potentially destroy the inflationary regime; however, we demonstrate that this generically does not happen for α-attractors. Depending on the details of the superpotential, the volume modulus can either be stable during the entire inflationary trajectory, or become tachyonic at some point and act as a waterfall field, resulting in a sudden end of inflation. In the latter case there is a universal supersymmetric minimum where the scalars end up, preventing the decompactification scenario. The gravitino mass is independent from the inflationary scale with no fine-tuning of the parameters. The observational predictions conform to the universal value of attractors, fully compatible with the Planck data, with possibly a capped number of e-folds due to the interplay with moduli.improves the decoupling of the two physical scales. This so-called KL model and its coupling to inflation was further explored in [5,6]. arXiv:1607.08231v2 [hep-th]

An algebraic classification of exceptional EFTs. Part II. Supersymmetry

“…For scalar EFTs Lie-algebraic approaches have been presented in [23,24] while in [25] these methods were used to prove that a gauge vector cannot be a Goldstone mode of a spontaneously broken space-time symmetry without introducing new degrees of freedom. This implies that the Born-Infeld (BI) vector is not special from the perspective of non-linear symmetries and enhanced soft limits (the same result was found in [8] where it was shown that the BI vector has a vanishing soft weight).Recently, we presented an algorithm for an exhaustive classification of the possible algebras which can be non-linearly realised on a set of Goldstone modes with linearly realised Poincaré symmetries 4 and canonical propagators in [26]. We illustrated this with EFTs of multiple scalars and multiple spin-1/2 fermions.…”

“…A second possibility is the Special Galileon [32,36] which has been studied from various directions [37,38]. In our recent paper [26] we have demonstrated from an algebraic perspective that these are the only two exceptional algebras and EFTs for a single scalar field. Moreover, in the context of fermionic Goldstones, we proved that the only exceptional EFT is that corresponding to Volkov-Akulov (VA) [39] and its multi-field extensions which nonlinearly realise supersymmetry (SUSY) algebras 5 .…”

“…In this paper we adapt our approach to classify supersymmetric theories i.e. we replace the linear Poincaré symmetries assumed in [26] with those of N = 1 supersymmetry (SUSY). From now on we refer to [26] as part I and the present paper as part II.…”

“…Recently, we presented an algorithm for an exhaustive classification of the possible algebras which can be non-linearly realised on a set of Goldstone modes with linearly realised Poincaré symmetries 4 and canonical propagators in [26]. We illustrated this with EFTs of multiple scalars and multiple spin-1/2 fermions.…”

Influence of Electrode Gas Flow Rate and Solid Oxide Ratio in Electrolyte on the Seebeck Coefficient of Molten Carbonate Thermocell

“…18 The distance between the electrodes h = 3.8 cm. The system characteristic relaxation time is therefore θ = h 2 /(π 2 D) = 29 hrs, cf.…”