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Cosmological acceleration
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An overview is given of the current status of the theory and observations of the acceleration of the expansion of the observable part of the Universe. Contents 1. Historical Introduction 2. Friedmann equations and cosmological acceleration 3. Vacuum energy problem 4. Data in favor of cosmological acceleration 5.Data on supernovae and baryon acoustic oscillations 5.1 Cosmography primer: distances in the Universe; 5.2 Photometric distance; 5.3 Cosmic distance ladder; 5.4 Variety of type-Ia supernovae light curves and their usage in cosmography; 5.5 Baryon acoustic oscillations (BAOs); 5.6 BAOs in the correlation function of galaxies; 5.7 Summary of results on supernovae combined with BAOs; 5.8 Systematics and dependence on z; 5.9 Supernovae as primary distance indicators; 5.10 Merging of neutron stars and the standard siren method 6. Dark energy 7. Modified gravity 8.Conclusion 9.Appendices 9.1 Derivation of the Friedmann equations; 9.2 Cosmological parameters; 9.3 Scalar field
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Dynamical mechanism of vacuum energy compensation
A scalar field with nonlinear coupling to curvature dynamically drives the Ricci scalar to zero, converting de Sitter expansion into H=1/(2t).
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