8 papers
The art of simulating the early Universe. Part II. Non-canonical cases & gravitational waves
Jorge Baeza-Ballesteros, Daniel G. Figueroa, Adrien Florio +7
We present a discussion on lattice techniques for the simulation of non-canonical field theory circumstances, complementing our previous monograph (arXiv:2006.15122) on canonical c…
The non-linear dynamics of axion inflation: a detailed lattice study
Daniel G. Figueroa, Joanes Lizarraga, Nicolás Loayza +2
We study in detail the fully inhomogeneous non-linear dynamics of axion inflation, identifying three regimes: weak-, mild-, and strong-backreaction, depending on the duration of in…
The spectrum of axions in a scaling string network
José Correia, Mark Hindmarsh, Joanes Lizarraga +3
Cosmic strings formed when the Peccei-Quinn symmetry breaks post-inflation are expected to emit axions throughout their lifetime. The details of the evolution of this network and t…
Kinetic Fragmentation of the QCD Axion on the Lattice
Matteo Fasiello, Joanes Lizarraga, Alexandros Papageorgiou +1
Kinetic misalignment, one of the most compelling scenarios for the non-thermal generation of axion dark matter, is generally accompanied by axion fragmentation, a process in which…
Gravitational wave and particle emission from a cosmic string loop: local case
Jorge Baeza-Ballesteros, Edmund J. Copeland, Daniel G. Figueroa +1
Using lattice field simulations of the Abelian-Higgs model, we characterize the simultaneous emission of (scalar and gauge) particles and gravitational waves (GWs) by local string…
Comparative study of the strong backreaction regime in axion inflation: the effect of the potential
Joanes Lizarraga, Carmelo López-Mediavilla, Ander Urio
Recent works have demonstrated the necessity of capturing the local inhomogeneous physics in axion inflation, and showed new genuine features, most notably the extension of the inf…