Accelerated expansion of the universe driven by tachyonic matter

Abstract

It is an accepted practice in cosmology to invoke a scalar field with potential $V(\varphi )$ when observed evolution of the universe cannot be reconciled with theoretical prejudices. Since one function-degree-of-freedom in the expansion factor $a(t)$ can be traded off for the function $V(\varphi )$, it is {\it always} possible to find a scalar field potential which will reproduce a given evolution. I provide a recipe for determining $V(\varphi )$ from $a(t)$ in two cases:(i) Normal scalar field with Lagrangian $\mathcal{L}=(1/2){\partial }_a\varphi {\partial }^a\varphi -V(\varphi )$ used in quintessence/dark energy models. (ii) A tachyonic field with Lagrangian $\mathcal{L}=-V(\varphi )[1-{\partial }_a\varphi {\partial }^a\varphi {]}^{1/2}$, motivated by recent string theoretic results. In the latter case, it is possible to have accelerated expansion of the universe during the late phase in certain cases. This suggests a string theory based interpretation of the current phase of the universe with tachyonic condensate acting as effective cosmological constant.

4 pages; uses revtex4

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• Tachyonic potential in Bianchi type-I universe
• Reconstruction of Dynamical Dark Energy Potentials: Quintessence, Tachyon and interacting models
• Holographic field theory models of dark energy in interaction with dark matter
• Perturbed dark energy: classical scalar field versus tachyon
• Scalar Field as Dark Energy Accelerating Expansion of the Universe
• Tachyon field in loop quantum cosmology: An example of traversable singularity
• The Extended Analysis On New Generalized Chaplygin Gas
• Brane-Antibrane Systems at Finite Temperature and Phase Transition near the Hagedorn Temperature
• Field independent cosmic evolution
• Dynamical System Analysis of a Dirac-Born-Infeld Model : A Center Manifold Perspective
• Dark Energy and Modified Scale Covariant Theory of Gravitation
• Perturbations in Tachyon Dark Energy and their Effect on Matter Clustering
• A new logotropic model based on a complex scalar field with a logarithmic potential
• Tachyonic (phantom) power-law cosmology
• Observational Status of Tachyon Natural Inflation and Reheating
• Holographic warm inflation
• Reconstructing quintom from WMAP 5-year observations: Generalized ghost condensate
• Cosmological constraints on superconducting dark energy models
• Thermodynamics in Kaluza-Klein Universe
• Anisotropic Dark Energy and the Generalized Second Law of Thermodynamics
• Cosmic Microwave Background Anisotropy numerical solution (CMBAns) I: An introduction to $C_l$ calculation
• Scattering and absorption sections of Schwarzschild-anti de Sitter with quintessence
• Tachyonic vs Quintessence dark energy: linear perturbations and CMB data
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• Quantum Theory at Planck Scale, Limiting Values, Deformed Gravity and Dark Energy Problem
• Mirage cosmology with an unstable probe D3-brane
• De Sitter cosmology from Gauss-Bonnet dark energy with quantum effects
• Constraining the Lattice Fluid Dark Energy from SNe Ia, BAO and OHD
• A cosmological model describing the early inflation, the intermediate decelerating expansion, and the late accelerating expansion by a quadratic equation of state
• Scalar field inflation and Shan-Chen fluid models
• Tachyon Mimetic Inflation as an Instabilities-Free Model
• Analysis cosmological tachyon and fermion model and observation data constraints
• Thermodynamical description of modified generalized Chaplygin gas model of dark energy
• Beyond $\Lambda$CDM: Exploring a Dynamical Cosmological Constant Framework Consistent with Late-Time Observations
• Holographic reconstruction of k-essence model with Tsallis and the most generalized Nojiri-Odintsov version of holographic dark energy
• Interacting Barrow Holographic Dark Energy in Non-flat Universe
• Tsallis holographic inflation in $f(R,T)$ gravity: CMB constraints, reheating, and swampland implications
• Tachyon field inspired dark energy and supernovae constraints
• New holographic Chaplygin gas model of dark energy
• Tachyon field non-minimally coupled to massive neutrino matter
• Friedmann-Robertson-Walker Models with Late-Time Acceleration
• Evolution of spherical over-densities in tachyon scalar field model
• Power-law cosmological solution derived from DGP brane with a brane tachyon field
• Singularity crossing, transformation of matter properties and the problem of parametrization in field theories
• Tachyonization of the $\La$CDM cosmological model
• Transient Accelerating Scalar Models with Exponential Potential
• Duality linking standard and tachyon scalar field cosmologies
• Non-linear spherical collapse in tachyon models, and a comparison of collapse in tachyon and quintessence models of dark energy
• A note on second-order perturbations of non-canonical scalar fields
• Primordial scalar perturbations in tachyonic power-law inflation
• Cosmological models based on a complex scalar field with a power-law potential associated with a polytropic equation of state
• WMAP Bounds on Braneworld Tachyonic Inflation
• Dynamical System Analysis of Brane Induced Gravity with Tachyon Field
• Cosmic acceleration in a model of scalar-tensor gravitation
• Crossing the phantom divide with a classical Dirac field
• Role of generalized Ricci dark energy on Chameleon field in the emergent universe
• Statefinder Diagnostic for Dark Energy Models in Bianchi I Universe
• Evolution of Dark Energy Perturbations for Slotheon Field and Power Spectrum
• Role of Tachyonic Field in Accelerating Universe in Presence of Perfect Fluid
• Finite Temperature Systems of Brane-Antibrane on a Torus
• Regular Friedmann Universes and Matter Transformations
• Future soft singularities, Born-Infeld-like fields and particles
• Effect of dark energy sound speed and equation of state on CDM power spectrum
• Cosmological Evolution of Viscous Dark Energy in f(Q,C) Gravity: Two-Fluid Approach
• Comparison of Supernovae datasets Constraints on Dark Energy
• Probing Dark Energy Properties in $fQ,C)$ Gravity with FLRW Cosmological Models
• Analytical considerations about the cosmological constant and dark energy
• Non-Gaussianity from Features
• Perturbation in an interacting dark universe
• Anisotropic background for two fluids: matter and holographic dark energy
• Enhanced power of gravitational waves and rapid coalescence of black hole binaries through dark energy accretion
• Inflation is the generic feature of phantom field-not the big-rip
• On single scalar field cosmology
• Intermediate inflation or late time acceleration?
• Latest Cosmological Constraints on Cardassian expansion models including the updated Gamma-ray bursts
• A class of regular bouncing cosmologies
• Twinlike models for parametrized dark energy
• Quintessence and tachyon dark energy in interaction with dark matter: Observational constraints and model selection
• Cosmological singularities in non-canonical models of dark energy
• Chaplygin Gas of Tachyon Nature Imposed by Symmetry and Constrained via H(z) Data
• Hubble Tension and Dark Energy in Teleparallel Gauss-Bonnet Gravity: New Constraints from DESI BAO, Pantheon${}^{+}$ and Hubble Data
• Power spectra in extended tachyon cosmologies
• Extended tachyon field using form invariance symmetry
• Dynamical System Analysis of Randall-Sundrum Model with Tachyon Field on the Brane
• Inflation driven by single geometric tachyon with D-brane orbiting around NS5-branes
• A note on Tachyon dynamics
• Accelerated expansion of a universe containing a self-interacting Bose-Einstein gas
• Reconstruction of 5D Cosmological Model From Recent Observations
• Skewness of matter distribution in clustering dark energy cosmologies
• Geometric sigma model of the Universe
• Crossing the phantom divide with k-essence in brane-worlds
• Weak Gravity Conjecture and Holographic Dark Energy Model with Interaction and Spatial Curvature
• Thermodynamics and holography of tachyon cosmology
• Resembling holographic dark energy with f(R)gravity as scalar field and ghost dark energy with tachyon scalar fields
• Large-scale structure formation in cosmology with classical and tachyonic scalar fields
• Generalized EMP and nonlinear Schrodinger-type reformulations of some scalar field cosmological models
• Interacting Models of Generalised Chaplygin Gas and Modified Chaplygin Gas with Barotropic Fluid
• The Stability Analysis of Brane Induced Gravity with Quintessence Field on the Brane with a Gaussian Potential
• Matter Creation Cosmologies and Accelerated Expansion
• Covariant holography of a tachyonic accelerating universe
• Again About Singularity Crossing In Gravitation And Cosmology
• Kinetic coupled tachyon: A dynamical system analysis
• Non-BPS D9-branes in the Early Universe
• Dark energy with oscillatory tracking potential: Observational Constraints and Perturbative effects
• Phase space of multi-fluid universe in $F(T)$-gravity and some enhancements for the oscillating interaction model
• Tachyonic fields in cosmology
• Particle mixing as possible explanation of the dark energy conundrum
• Interacting tachyon with varying mass dark matter
• k-essence and extended tachyons in brane-worlds
• Inference of cosmological models with principal component analysis
• Stability Analysis of DGP Brane-world Model with Agegraphic Dark Energy
• Thermodynamics of irreversible particle creation phenomena and its cosmological consequence
• Perturbations In Some Dark Energy Models
• Complex Inflaton Potentials with Nonminimal Coupling: Robust Inflation and Geometric Reheating
• Observational Constraints and Geometric Diagnostics of Barboza-Alcaniz and Logarithmic Dark Energy Parametrizations
• Dynamics of tachyon dark energy on large scales and its imprint on observed galaxy power spectrum
• Cosmology of the Symmetrical Relativity versus Spontaneous Creation of the Universe Ex Nihilo
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI
• On the Stability of Dark Energy Scalar Field Reconstruction from SNe Ia Data
• Some Consequences of Dark Energy Density varying Exponentially with Scale Factor
• Unified dynamical system formulations for $f(R,\varphi ,X)$ gravity with applications to nonminimal derivative coupling and $R^2$-Higgs inflation
• Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter
• A speed limit on tachyon fields from cosmological and fine-structure data