SearcharxivSearch

arXiv · astro-ph/0206381

Report to Anaximander: A Dialogue on the Origin of the Cosmos in the Cradle of Western Civilization

Abstract

The presentations in the 2nd Hellenic Cosmology Workshop covered a broad range of cosmological subjects. Following the analogy with the architectural masters of Ancient Greece, the contributions are presented in ``architectural'' sessions. The session on the ``Architects'' involves ``fundamental cosmology'', focussing on the topology and geometry of our Universe and the fundamental physical laws and processes at work in the first decisive moments of the (Very) Early Universe. Following these cosmic blueprints, the ``Constructors'' set out to present the ultimate realization of the cosmic framework. This concerns the search for the best available estimates of the parameters characterizing the Friedmann-Robertson-Walker metric. The specification of these cosmic measures paves the way for the ``Interior Decorators'' to take care of the cosmic ``Infrastructure''. This involves the patterns and morphology of Megaparsec scale cosmic structure and its emergence through gravitational instability, as well as aspects concerning the rise of galaxies through the complex interplay of gravitational, hydrodynamic, radiative, stellar and other dissipative processes.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Rien van de Weygaert. 2002-06-21. Report to Anaximander: A Dialogue on the Origin of the Cosmos in the Cradle of Western Civilization. https://arxiv.org/abs/astro-ph/0206381

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

Deformation procedure for scalar fields in cosmology

This work offers an extension of the deformation procedure introduced in field theory to the case of standard cosmology in the presence of real scalar field in flat space-time. The procedure is shown to work for many models, which give rise to several different cosmic scenarios, evolving under the presence of first-order differential equations which solve the corresponding equations of motion very appropriately.

astro-ph

Dark Energy is the Cosmological Quantum Vacuum Energy of Light Particles-The Axion and the Lightest Neutrino

We uncover the general mechanism producing the dark energy(DE). This is only based on well known quantum physics and cosmology. We show that the observed DE originates from the cosmological quantum vacuum of light particles which provides a continuous energy distribution able to reproduce the data. Bosons give positive contributions to the DE while fermions yield negative contributions. As usual in field theory, ultraviolet divergences are subtracted from the physical quantities. The subtractions respect the symmetries of the theory and we normalize the physical quantities to be zero for the Minkowski vacuum. The resulting finite contributions to the energy density and the pressure from the quantum vacuum grow as log a(t) where a(t) is the scale factor, while the particle contributions dilute as 1/a^3(t), as it must be for massive particles. The DE equation of state P = w(z)H turns to be w(z)<-1 with w(z) asymptotically reaching the value -1 from below.A scalar particle can produce the observed DE through its quantum cosmological vacuum provided:(i)its mass is of the order of 10^{-3} eV = 1 meV,(ii) it is very weakly coupled and (iii) it is stable on the time scale of the age of the universe. The axion vacuum thus appears as a natural candidate. The neutrino vacuum (especially the lightest mass eigenstate) can give negative contributions to the DE. We find that w(z=0) is slightly below -1 by an amount ranging from [-1.5 10^{-3}] to [-8 10^{-3}] and we predict the axion mass to be in the range between 4 and 5 meV. We find that the universe will expand in the future faster than the de Sitter universe, as an exponential in the square of the cosmic time. DE arises from the quantum vacua of light particles in FRW cosmological space time in an analogous way to the Casimir effect in Minkowski spacetime with non trivial boundaries.

astro-ph