Dynamics of Inspiraling Dark Energy

Abstract

We investigate the dynamics of a multifield dark energy model, which arises from certain rapid-turning and inspiraling trajectories in field space. We find the speed of sound $c_s$ of the dark energy perturbations around the background and show that $c_s$ is monotonically decreasing with time. Furthermore, it has a positive-definite lower bound that implies a certain clustering scale. We also extend the previously known background solution for dark energy to an exact solution that includes matter. This allows us to address the implications of our model for two cosmological tensions. More precisely, we argue that the ${\sigma }_8$ tension can be alleviated generically, while reducing the Hubble tension requires certain constraints on the parameter space of the model. Notably, a necessary condition for alleviating the Hubble tension is that the transition from matter domination to the dark energy epoch begins earlier than in $\Lambda$CDM.

36 pages; minor improvements, references added

References in corpus (43)

• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• H0LiCOW XIII. A 2.4% measurement of $H_0$ from lensed quasars: $5.3\sigma$ tension between early and late-Universe probes
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• Distance and de Sitter Conjectures on the Swampland
• Bounds on Slow Roll and the de Sitter Swampland
• On the Hubble constant tension in the SNe Ia Pantheon sample
• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• On the evolution of the Hubble constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: a feasibility study for GRB-cosmology in 2030
• Arbitrating the $S_8$ discrepancy with growth rate measurements from Redshift-Space Distortions
• Seeding primordial black holes in multifield inflation
• The string swampland constraints require multi-field inflation
• Running Hubble Tension and a H0 Diagnostic
• f(R) cosmology by Noether's symmetry
• Is there an early Universe solution to Hubble tension?
• A rapid transition of $G_{\mathrm{eff}}$ at $z_t\simeq 0.01$ as a solution of the Hubble and growth tensions
• Revealing Intrinsic Flat $\Lambda$CDM Biases with Standardizable Candles
• Turning in the landscape: a new mechanism for generating Primordial Black Holes
• Noether symmetries in Bianchi universes
• Reconstruction of the Scalar-Tensor Lagrangian from a LCDM Background and Noether Symmetry
• Evidence of a decreasing trend for the Hubble constant
• Recombination-independent determination of the sound horizon and the Hubble constant from BAO
• Primordial fluctuations and non-Gaussianities in sidetracked inflation
• Primordial perturbations from inflation with a hyperbolic field-space
• The rapid-turn inflationary attractor
• Cumulative effects in inflation with ultra-light entropy modes
• Angular inflation in multi-field $\alpha$-attractors
• Can a galaxy redshift survey measure dark energy clustering?
• Hyperinflation generalised: from its attractor mechanism to its tension with the `swampland conjectures'
• Inference of the cosmic rest-frame from supernovae Ia
• Revealing the late-time transition of $H_0$: relieve the Hubble crisis
• Out of the Swampland with Multifield Quintessence?
• Shift-Symmetric Orbital Inflation: single field or multi-field?
• New accelerating solutions in late-time cosmology
• Multi-field dark energy: cosmic acceleration on a steep potential
• On Primordial Black Holes from Rapid Turns in Two-field Models
• A Tip for Landscape Riders: Multi-Field Inflation Can Fulfill the Swampland Distance Conjecture
• The Multi-Field, Rapid-Turn Inflationary Solution
• A simple, exact, model of quasi-single field inflation
• The Oscillatory Universe, phantom crossing and the Hubble tension
• Dark Energy from Inspiraling in Field Space
• Two-field Cosmological $\alpha$-attractors with Noether Symmetry
• (Slow-)Twisting inflationary attractors
• Hidden Symmetries, Rapid Turns and Cosmic Acceleration

Cited by in corpus (2)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• On the Consistency of Rapid-Turn Inflation