Numerical Relativity as a New Tool for Fundamental Cosmology
arXiv:2201.03752 · doi:10.3390/physics4010021
Abstract
Advances in our understanding of the origin, evolution and structure of the universe have long been driven by cosmological perturbation theory, model building and effective field theory. In this review, we introduce numerical relativity as a powerful new complementary tool for fundamental cosmology. To illustrate its power, we discuss applications of numerical relativity to studying the robustness of slow contraction and inflation in homogenizing, isotropizing and flattening the universe beginning from generic unsmooth initial conditions. In particular, we describe how recent numerical relativity studies of slow contraction have revealed a novel, non-linear smoothing mechanism based on ultralocality that challenges the conventional view on what is required to explain the large-scale homogeneity and isotropy of the observable universe.
arXiv comment16 pages, 3 figures
References in corpus (39)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- The galileon as a local modification of gravity
- Evolution of Binary Black Hole Spacetimes
- Chern-Simons Modified General Relativity
- Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies
- Numerical Relativity Using a Generalized Harmonic Decomposition
- Constraint damping in the Z4 formulation and harmonic gauge
- G-Bounce
- Numerical Relativity: A review
- Simulation of Binary Black Hole Spacetimes with a Harmonic Evolution Scheme
- A new kind of cyclic universe
- Beginning inflation in an inhomogeneous universe
- Fully stable cosmological solutions with a non-singular classical bounce
- Well-posed formulation of Lovelock and Horndeski theories
- Robustness of Inflation to Inhomogeneous Initial Conditions
- On the local well-posedness of Lovelock and Horndeski theories
- Stability of Geodesically Complete Cosmologies
- Einstein's Equations with Asymptotically Stable Constraint Propagation
- The Singularity in Generic Gravitational Collapse Is Spacelike, Local, and Oscillatory
- Fixing extensions to General Relativity in the non-linear regime
- Cosmological bounce and Genesis beyond Horndeski
- Spikes in the Mixmaster regime of G_2 cosmologies
- Supersmoothing through Slow Contraction
- Nonlinear/non-iterative treatment of EFT-motivated gravity
- Robustness of Inflation to Large Tensor Perturbations
- Towards the nonlinear regime in extensions to GR: assessing possible options
- Challenges to global solutions in Horndeski's theory
- The Effects of Potential Shape on Inhomogeneous Inflation
- Space-time slicing in Horndeski theories and its implications for non-singular bouncing solutions
- Ekpyrotic Cosmology with a Zero-Shear S-Brane
- Robustness of slow contraction to cosmic initial conditions
- Inhomogeneous initial conditions for inflation: A wibbly-wobbly timey-wimey path to salvation
- Fermi-bounce cosmology and the fermion curvaton mechanism
- Spike behavior in the approach to spacetime singularities
- Horndeski genesis: consistency of classical theory
- Ultralocality and Slow Contraction
- Stability and the Gauge Problem in Non-Perturbative Cosmology
- The Effects of Multiple Modes and Reduced Symmetry on the Rapidity and Robustness of Slow Contraction
- Dynamical attractors in contracting spacetimes dominated by kinetically coupled scalar fields
Cited by in corpus (9)
- Initial conditions problem in cosmological inflation revisited
- Cosmology using numerical relativity
- Fingerprints of a Non-Inflationary Universe from Massive Fields
- The robustness of slow contraction and the shape of the scalar field potential
- Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
- Gauge/frame invariant variables for the numerical relativity study of cosmological spacetimes
- Structure formation and quasi-spherical collapse from initial curvature perturbations with numerical relativity simulations
- Stochastic Inflation in Numerical Relativity
- Gravitational Collapse of an Inhomogeneous Fluid in Rastall Theory