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Lattice simulations of inflation
- A. Caravano, E. Komatsu, K. Lozanov, J. Weller
- Computer ScienceJournal of Cosmology and Astroparticle Physics
- 12 February 2021
This paper uses a lattice simulation to reproduce the well-known results of some simple models of single-field inflation, particularly for the scalar field perturbation.
Combining cosmological and local bounds on bimetric theory
- A. Caravano, Marvin Lüben, J. Weller
- PhysicsJournal of Cosmology and Astroparticle Physics
- 21 January 2021
Ghost-free bimetric theory describes two nonlinearly interacting spin-2 fields, one massive and one massless, thus extending general relativity. We confront bimetric theory with observations of…
Lattice Simulations of Abelian Gauge Fields coupled to Axion during Inflation
This work uses a non-linear lattice simulation to study a model of axion inflation where the inflaton is coupled to a U(1) gauge field through Chern-Simons interaction and identifies a discretization scheme for which the growth of the gauge field on the lattice reproduces the one of continuous space with good precision.
Optical follow-up of the Crab pulsar (PSR J0534+2200)
Observations of variables
Lattice Simulations of Axion-U(1) Inflation
If gauge ﬁelds are coupled to an axion ﬁeld during inﬂation, they lead to unique observational signatures within the reach of next generation experiments. However, this system often shows strong…