New Cosmic Accelerating Scenario without Dark Energy

Abstract

We propose an alternative, nonsingular, cosmic scenario based on gravitationally induced particle production. The model is an attempt to evade the coincidence and cosmological constant problems of the standard model ($\Lambda$CDM) and also to connect the early and late time accelerating stages of the Universe. Our space-time emerges from a pure initial de Sitter stage thereby providing a natural solution to the horizon problem. Subsequently, due to an instability provoked by the production of massless particles, the Universe evolves smoothly to the standard radiation dominated era thereby ending the production of radiation as required by the conformal invariance. Next, the radiation becomes sub-dominant with the Universe entering in the cold dark matter dominated era. Finally, the negative pressure associated with the creation of cold dark matter (CCDM model) particles accelerates the expansion and drives the Universe to a final de Sitter stage. The late time cosmic expansion history of the CCDM model is exactly like in the standard $\Lambda$CDM model, however, there is no dark energy. This complete scenario is fully determined by two extreme energy densities, or equivalently, the associated de Sitter Hubble scales connected by ${\rho }_I/{\rho }_f=(H_I/H_f{)}^2\sim 10^{122}$, a result that has no correlation with the cosmological constant problem. We also study the linear growth of matter perturbations at the final accelerating stage. It is found that the CCDM growth index can be written as a function of the $\Lambda$ growth index, ${\gamma }_{\Lambda }\simeq 6/11$. In this framework, we also compare the observed growth rate of clustering with that predicted by the current CCDM model. Performing a ${\chi }^2$ statistical test we show that the CCDM model provides growth rates that match sufficiently well with the observed growth rate of structure.

12 pages, 3 figures, accepted for publication by Phys. Rev. D. (final version, some references have corrected). arXiv admin note: substantial text overlap with arXiv:1106.1938

References in corpus (19)

• Dark Energy and the Accelerating Universe
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• Large-scale instability in interacting dark energy and dark matter fluids
• Testing LCDM with the Growth Function δ(a): Current Constraints
• Dark Interactions and Cosmological Fine-Tuning
• Toward a solution of the coincidence problem
• The oscillating dark energy: future singularity and coincidence problem
• The dispersion of growth of matter perturbations in f(R) gravity
• An Accelerating Cosmology Without Dark Energy
• Growth factor parametrization and modified gravity
• Growth Index of DGP Model and Current Growth Rate Data
• Confronting Dark Energy Models using Galaxy Cluster Number Counts
• Bayesian Analysis and Constraints on Kinematic Models from Union SNIa
• Interacting Cosmological Fluids and the Coincidence Problem
• Cosmology, Thermodynamics and Matter Creation
• Evolution of density perturbations in decaying vacuum cosmology: The case of non-zero perturbations in the cosmological term
• Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies

Cited by in corpus (66)

• Cosmological model from the holographic equipartition law with a modified Rényi entropy
• Entropic cosmology for a generalized black-hole entropy
• Complete Cosmic History with a dynamical Lambda(H) term
• Matter creation and cosmic acceleration
• Evolution of the universe in entropic cosmologies via different formulations
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• An overview of what current data can (and cannot yet) say about evolving dark energy
• Irreversible thermodynamic description of interacting dark energy - dark matter cosmological models
• Entropy evolution of universes with initial and final de Sitter eras
• Gravitationally Induced Particle Production: Thermodynamics and Kinetic Theory
• Evolution and Dynamics of a Matter creation model
• General form of entropy on the horizon of the universe in entropic cosmology
• A third alternative to explain recent observations: Future deceleration
• Cosmic acceleration without dark energy: Background tests and thermodynamic analysis
• Non-adiabatic-like accelerated expansion of the late universe in entropic cosmology
• Gravitationally induced adiabatic particle production: From Big Bang to de Sitter
• Entropic cosmology in a dissipative universe
• A complete cosmic scenario from inflation to late time acceleration: Non-equilibrium thermodynamics in the context of particle creation
• Interacting dark sector with variable vacuum energy
• Dynamics in Varying vacuum Finsler-Randers Cosmology
• Minimal dark energy: key to sterile neutrino and Hubble constant tensions?
• Generalized thermodynamic constraints on holographic-principle-based cosmological scenarios
• Polytropic dark matter flows illuminate dark energy and accelerated expansion
• Thermodynamic aspects of dark energy fluids
• Two-fluid solutions of particle-creation cosmologies
• Dynamical analysis of interacting dark energy model in the framework of particle creation mechanism
• Cosmological solutions with gravitational particle production and non-zero curvature
• Cosmic microwave background radiation temperature in a dissipative universe
• On the equivalence of Lambda(t) and gravitationally induced particle production cosmologies
• Will there be future deceleration? A study of particle creation mechanism in non-equilibrium thermodynamics
• Is $\Lambda$CDM an effective CCDM cosmology?
• Dynamical stability in models where dark matter and dark energy are non-minimally coupled to curvature
• Dark Energy: The Shadowy Reflection of Dark Matter?
• Dark Gravitational Sectors on a Generalized Scalar-Tensor Vector Bundle Model and Cosmological Applications
• Viability of the $R+e^T$ cosmology
• Dark matter interacts with variable vacuum energy
• The Impact of Particle Production on Gravitational Baryogenesis
• Degeneracy between CCDM and $\Lambda$CDM cosmologies
• Bayesian analysis of CCDM Models
• Polymer dynamics of isotropic universe in Ashtekar and in volume variables
• From inflation to late time acceleration with a decaying vacuum coupled to radiation or matter
• Gravitationally Induced Particle Production and its Impact on the WIMP Abundance
• Cosmological Constraints on Entropic Cosmology with Matter Creation
• Gravitational baryogenesis without CPT violation
• Can the Universe decelerate in the future?
• Thermodynamic implications of the gravitationally induced particle creation scenario
• Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
• Thermodynamic analysis of universes with the initial and final de-Sitter eras
• Cosmological solutions in spatially curved universes with adiabatic particle production
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• Accelerated Expansion of the universe based on Particle Creation-Destruction Processes and Dark Energy in FLRW universes
• CCDM Model with Spatial Curvature and The Breaking of "Dark Degeneracy"
• Do current observations support transient acceleration of our universe?
• Particle Production and Universal Thermodynamics
• Dynamical systems analysis of a cosmological model with interacting Umami Chaplygin fluid in adiabatic particle creation mechanism: Some bouncing features
• A unified cosmic evolution: Inflation to late time acceleration
• Wormhole Formation with Gravitational Particle Creation Mechanism
• Cosmological scenario based on the particle creation and holographic equipartition
• Thermodynamic constraints on matter creation models
• Matter Creation Cosmologies and Accelerated Expansion
• Particle Production Scenario in an Algebraically Coupled Quintessence Field with a Dark Matter Fluid
• Cosmological solutions with time-delay
• Evolution of primordial black holes in an adiabatic FLRW universe with gravitational particle creation
• Accelerating scaling solutions from dark matter particle creation
• Matter-antimatter asymmetry and other cosmological puzzles via running vacuum cosmologies
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI