March 30, 2021 to April 1, 2021
Institut Henri Poincaré
Europe/Paris timezone

Kination cosmology from scalar fields and gravitational-wave signatures

Mar 31, 2021, 2:15 PM


Peera Simakachorn (Universität Hamburg and DESY)


A scalar field with large kinetic energy can dominate the Universe at early times and generates the so-called kination era. We present a natural and well-motivated particle physics realization, based simply on a Peccei-Quinn mechanism. The presence of kination imprints a smoking-gun spectral enhancement in the stochastic gravitational-wave (GW) background. Current and future-planned GW observatories could constrain particle theories that generate the kination phase. This work explores kination from a complex scalar field responsible for spontaneous symmetry-breaking of a U(1)-symmetry related to baryogenesis and axion physics. Surprisingly, the viable parameter space allows for a kination era at the TeV scale and generates a peaked spectrum of GW from either cosmic strings or primordial inflation, which lies inside ET and CE windows.

Primary authors

Peera Simakachorn (Universität Hamburg and DESY) Prof. Geraldine Servant (Universität Hamburg and DESY) Dr Yann Gouttenoire (Tel Aviv University and DESY)

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