A novel two-field pure K-essence for inflation, dark matter, dark energy and black holes
arXiv:2402.04460 · doi:10.3390/universe10060235
Abstract
K-essence theories are usually studied in the framework of one scalar field . Namely, the Lagrangian of K-essence is the function of scalar field and its covariant derivative. However, in this paper, we explore a two-field pure K-essence, i.e. the corresponding Lagrangian is the function of covariant derivatives of two scalar fields without the dependency of scalar fields themselves. That is why we call it pure K-essence. The novelty of this K-essence is that its Lagrangian contains the quotient term of the kinetic energies from the two scalar fields. This results in the presence of many interesting features, for example, the equation of state can be arbitrarily small and arbitrarily large. As a comparison, the range for equation of state of quintessence is from to . Interestingly, this novel K-essence can play the role of inflation field, dark matter and dark energy. Finally, the absence of the scalar fields themselves in the equations of motion makes the study considerable simple such that even the exact black hole solutions can be found.
arXiv comment12 pages,18 figures
References in corpus (33)
- Cosmological Constant - the Weight of the Vacuum
- Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
- A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
- k-Inflation
- Essentials of k-essence
- Kinetically Driven Quintessence
- Perturbations in k-inflation
- Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
- Dark Matter and Dark Energy Interactions: Theoretical Challenges, Cosmological Implications and Observational Signatures
- Measurements of the Hubble Constant: Tensions in Perspective
- Purely kinetic k-essence as unified dark matter
- Dynamical dark energy in light of the latest observations
- Unified phantom cosmology: inflation, dark energy and dark matter under the same standard
- Extended tachyon field, Chaplygin gas and solvable k-essence cosmologies
- Tracking K-essence
- Cuscuton: A Causal Field Theory with an Infinite Speed of Sound
- Dark energy in Horndeski theories after GW170817: A review
- Graduated dark energy: Observational hints of a spontaneous sign switch in the cosmological constant
- Power-law expansion in k-essence cosmology
- Relaxing cosmological tensions with a sign switching cosmological constant
- Is Local At Odds With Dark Energy EFT?
- K-essence and the coincidence problem
- No-go theorem for k-essence dark energy
- A k-essence Model Of Inflation, Dark Matter and Dark Energy
- On the Stability of Phantom K-essence Theories
- Unified dark energy and dark matter from a scalar field different from quintessence
- Unified Model of k-Inflation, Dark Matter & Dark Energy
- Early dark energy in -essence
- Atypical k-essence cosmologies
- Quintom fields from chiral K-essence cosmology
- Inflation and late-time accelerated expansion driven by -essence degenerate dynamics
- A new generic evolution for -essence dark energy with
- Statistics of Thawing K-essence Dark Energy Models