On the nature of dark energy: the lattice Universe

Abstract

There is something unknown in the cosmos. Something big. Which causes the acceleration of the Universe expansion, that is perhaps the most surprising and unexpected discovery of the last decades, and thus represents one of the most pressing mysteries of the Universe. The current standard $\Lambda$CDM model uses two unknown entities to make everything fit: dark energy and dark matter, which together would constitute more than 95% of the energy density of the Universe. A bit like saying that we have understood almost nothing, but without openly admitting it. Here we start from the recent theoretical results that come from the extension of general relativity to antimatter, through CPT symmetry. This theory predicts a mutual gravitational repulsion between matter and antimatter. Our basic assumption is that the Universe contains equal amounts of matter and antimatter, with antimatter possibly located in cosmic voids, as discussed in previous works. From this scenario we develop a simple cosmological model, from whose equations we derive the first results. While the existence of the elusive dark energy is completely replaced by gravitational repulsion, the presence of dark matter is not excluded, but not strictly required, as most of the related phenomena can also be ascribed to repulsive-gravity effects. With a matter energy density ranging from $\sim 5$ (baryonic matter alone, and as much antimatter) to $\sim 25$ of the so-called critical density, the present age of the Universe varies between about 13 and $15\mathrm{Gyr}$. The SN Ia test is successfully passed, with residuals comparable with those of the $\Lambda$CDM model in the observed redshift range, but with a clear prediction for fainter SNe at higher $z$. Moreover, this model has neither horizon nor coincidence problems, and no initial singularity is requested. In conclusion, we have replaced all the tough problems of the current

arXiv comment10 pages, 3 figures, accepted as a Letter to the Editor by Astrophysics and Space Science

References in corpus (29)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The Cosmological Constant and Dark Energy
• 4D Gravity on a Brane in 5D Minkowski Space
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• First-year Sloan Digital Sky Survey-II (SDSS-II) Supernova Results: Hubble Diagram and Cosmological Parameters
• Reconciling dark energy models with f(R) theories
• SNLS3: Constraints on Dark Energy Combining the Supernova Legacy Survey Three Year Data with Other Probes
• Hubble Residuals of Nearby Type Ia Supernovae Are Correlated with Host Galaxy Masses
• A Matter-Antimatter Universe?
• A filament of dark matter between two clusters of galaxies
• Perturbations in a coupled scalar field cosmology
• CPT symmetry and antimatter gravity in general relativity
• Introducing the Dirac-Milne universe
• Testing Yukawa-like potentials from f(R)-gravity in elliptical galaxies
• Is dark matter an illusion created by the gravitational polarization of the quantum vacuum?
• Quantum Vacuum and Virtual Gravitational Dipoles: The solution to the Dark Energy Problem?
• "Dark energy" in the Local Void
• Quantum vacuum and dark matter
• Do we live in the universe successively dominated by matter and antimatter?
• What would be outcome of a Big Crunch?
• Reply to "Comment to a paper of M. Villata on antigravity"
• Time reversal and negative energies in general relativity

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• Antimatter Gravity and the Results of the ALPHA-g Experiment
• The antimatter gravitational field
• Antimatter Gravity Experiments, the Astronomical Challenges to Lambda-CDM Cosmology and the Quantum Vacuum as a Possible Source of Gravity in the Universe
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