Waterfall stiff period can generate observable primordial gravitational waves

Abstract

A toy-model is studied, which considers two flat directions meeting at an enhanced symmetry point such that they realise the usual hybrid inflation mechanism. The kinetic term of the waterfall field features a pole at its Planckian vacuum expectation value (VEV), as with $\alpha$-attractors. Consequently, after the phase transition which terminates hybrid inflation, the waterfall field never rolls to its VEV. Instead, it drives a stiff period, where the barotropic parameter of the Universe $w\approx 1/2$ results in a peak in the spectrum of primordial gravitational waves, which will be observable by the forthcoming LISA mission as well as by Advanced LIGO.

arXiv comment19 pages, 3 figures, published version

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Cited by in corpus (5)

• Signatures of Non-thermal Dark Matter with Kination and Early Matter Domination: Gravitational Waves versus Laboratory Searches
• Enhanced primordial gravitational waves from a stiff post-inflationary era due to an oscillating inflaton
• Observable Gravitational Waves from Hyperkination in Palatini Gravity and Beyond
• Mechanisms for producing Primordial Black Holes from Inflationary Models Beyond Fine-Tuning
• E- & T-Model Hybrid Inflation