Gravity waves in parity-violating Copernican Universes
arXiv:2001.06373 · doi:10.1103/PhysRevD.102.044039
Abstract
In recent work minimal theories allowing the variation of the cosmological constant by means of a balancing torsion, have been proposed. It was found that such theories contain parity violating homogeneous and isotropic solutions, due to a torsion structure called the Cartan spiral staircase. Their dynamics are controlled by Euler and Pontryagin quasi-topological terms in the action. Here we show that such theories predict a dramatically different picture for gravitational wave fluctuations in the parity violating branch. If the dynamics are ruled solely by the Euler-type term, then linear tensor mode perturbations are entirely undetermined, hinting at a new type of gauge invariance. The Pontryagin term not only permits for phenomenologically sounder background solutions (as found in previous literature), but for realistic propagation of gravitational wave modes. We discuss the observational constraints and predictions of these theories.
References in corpus (48)
- Planck 2015 results. XIII. Cosmological parameters
- Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
- Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
- Lorentz invariance with an invariant energy scale
- Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale
- Dark Energy after GW170817: dead ends and the road ahead
- Strong constraints on cosmological gravity from GW170817 and GRB 170817A
- Dark Energy after GW170817 and GRB170817A
- Implications of the Neutron Star Merger GW170817 for Cosmological Scalar-Tensor Theories
- Generalized Lorentz invariance with an invariant energy scale
- Lorentz-Violating Vector Fields Slow the Universe Down
- Doubly Special Relativity theories as different bases of --Poincaré algebra
- Cuscuton: A Causal Field Theory with an Infinite Speed of Sound
- Palatini form of 1/R gravity
- Conserved charges for gravity with locally AdS asymptotics
- Higgs-Palatini Inflation and Unitarity
- Nonsingular, big-bounce cosmology from spinor-torsion coupling
- Testing Parity-Violating Mechanisms with Cosmic Microwave Background Experiments
- Topological regularization and self-duality in four-dimensional anti-de Sitter gravity
- Can the Universe Create Itself?
- Parity breaking signatures from a Chern-Simons coupling during inflation: the case of non-Gaussian gravitational waves
- Waveform of gravitational waves in the general parity-violating gravities
- Interaction of the Barbero--Immirzi Field with Matter and Pseudo-Scalar Perturbations
- Unification of inflation and cosmic acceleration in the Palatini formalism
- Poincare gauge theory of gravity: Friedman cosmology with even and odd parity modes. Analytic part
- Gravitational Waves Probes of Parity Violation in Compact Binary Coalescence
- Polarizing primordial gravitational waves by parity violation
- Measuring chiral gravitational waves in Chern-Simons gravity with CMB bispectra
- Parity Violation of Gravitons in the CMB Bispectrum
- Parity-Violating Gravity and GW170817 in Non-Riemannian Cosmology
- Probing Gravitational Parity Violation with Gravitational Waves from Stellar-mass Black Hole Binaries
- The Chern-Simons Invariant as the Natural Time Variable for Classical and Quantum Cosmology
- Cartan's spiral staircase in physics and, in particular, in the gauge theory of dislocations
- The cosmology of minimal varying Lambda theories
- New Weyl-invariant vector-tensor theory for the cosmological constant
- Two- and Three-Dimensional Probes of Parity in Primordial Gravity Waves
- Model-independent test of the parity symmetry of gravity with gravitational waves
- Parity violating Friedmann Universes
- Non-minimally coupled scalar field cosmology with torsion
- Spacetime and dark matter from spontaneous breaking of Lorentz symmetry
- A Zero-Parameter Extension of General Relativity with Varying Cosmological Constant
- Luminal Propagation of Gravitational Waves in Scalar-tensor Theories: The Case for Torsion
- Chiral fermions and torsion in the early Universe
- Chiral photons from chiral gravitational waves
- Axionic cosmological constant
- Spinor driven cosmic bounces and their cosmological perturbations
- Torsion, an alternative to the cosmological constant?
- Parity at the Planck scale