The art of simulating the early universe. Part I. Integration techniques and canonical cases

@article{Figueroa2020TheAO,
  title={The art of simulating the early universe. Part I. Integration techniques and canonical cases},
  author={Daniel Garc{\'i}a Figueroa and Adrien Florio and Francisco Torrent{\'i} and Wessel Valkenburg},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2020},
  volume={2021}
}
We present a comprehensive discussion on lattice techniques for the simulation of scalar and gauge field dynamics in an expanding universe. After reviewing the continuum formulation of scalar and gauge field interactions in Minkowski and FLRW backgrounds, we introduce the basic tools for the discretization of field theories, including lattice gauge invariant techniques. Following, we discuss and classify numerical algorithms, ranging from methods of 𝒪(δ t2) accuracy like staggered leapfrog and… Expand
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References

SHOWING 1-10 OF 282 REFERENCES
Chirality transfer and chiral turbulence in gauge theories
Abstract Chirality transfer between fermions and gauge fields plays a crucial role for understanding the dynamics of anomalous transport phenomena such as the Chiral Magnetic Effect. In thisExpand
Gravitational waves from vacuum first-order phase transitions. II. From thin to thick walls
Building on previous work (https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.123513), the authors study through extensive numerical simulations the possibility of observing the gravitationalExpand
The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
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. While the abundanceExpand
Chiral Instabilities and the Onset of Chiral Turbulence in QED Plasmas.
TLDR
It is shown that the generation of strong helical magnetic fields from a helicity imbalance in the fermion sector proceeds via three distinct phases, which leads to the emergence of a self-similar scaling regime characteristic of a decaying turbulence, where magnetic helicity is efficiently transferred to macroscopic length scales. Expand
Chirality transfer & chiral turbulence in gauge theories
Chirality transfer between fermions and gauge fields plays a crucial role for understanding the dynamics of anomalous transport phenomena such as the Chiral Magnetic Effect. In this proceeding weExpand
Constraining Axion Inflation with Gravitational Waves across 29 Decades in Frequency.
We demonstrate that gravitational waves generated by efficient gauge preheating after axion inflation generically contribute significantly to the effective number of relativistic degrees of freedomExpand
Constraining axion inflation with gravitational waves from preheating
We study gravitational wave production from gauge preheating in a variety of inflationary models, detailing its dependence on both the energy scale and the shape of the potential. We show thatExpand
Early-Universe Simulations of the Cosmological Axion.
TLDR
This work describes the spectrum of primordial perturbations that are generated and comment on implications for efforts to detect axion DM, and measures the DM density at different simulated masses. Expand
Energy distribution and equation of state of the early Universe: Matching the end of inflation and the onset of radiation domination
Abstract We study the energy distribution and equation of state of the universe between the end of inflation and the onset of radiation domination (RD), considering observationally consistentExpand
First Simulations of Axion Minicluster Halos.
TLDR
Largely confirming theoretical expectations, overdensities begin to collapse in the radiation-dominated epoch and form an early distribution of miniclusters with masses up to 10^{-12}  M_{⊙}. Expand
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4
5
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