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Gravitational waves from colliding vacuum bubbles in gauge theories
Marek Lewicki, Ville Vaskonen
We study production of gravitational waves (GWs) in strongly supercooled cosmological phase transitions in gauge theories. We extract from two-bubble lattice simulations the scalin…
Cosmic String Interpretation of NANOGrav Pulsar Timing Data
John Ellis, Marek Lewicki
Pulsar timing data used to provide upper limits on a possible stochastic gravitational wave background (SGWB). However, the NANOGrav Collaboration has recently reported strong evid…
Updated predictions for gravitational waves produced in a strongly supercooled phase transition
John Ellis, Marek Lewicki, Ville Vaskonen
We update predictions for the gravitational wave (GW) signal from a strongly supercooled phase transition in an illustrative classically conformal U(1) model. We implement…
Gravitational wave spectra from strongly supercooled phase transitions
Marek Lewicki, Ville Vaskonen
We study gravitational wave (GW) production in strongly supercooled cosmological phase transitions, taking particular care of models featuring a complex scalar field with a U…
The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
Rouzbeh Allahverdi, Mustafa A. Amin, Asher Berlin +23
It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. W…
Detecting circular polarisation in the stochastic gravitational-wave background from a first-order cosmological phase transition
John Ellis, Malcolm Fairbairn, Marek Lewicki +2
We discuss the observability of circular polarisation of the stochastic gravitational-wave background (SGWB) generated by helical turbulence following a first-order cosmological ph…