Origin and evolution of the universe. From Big Bang to exobiology, 2nd edition

2021 ◽  
pp. 1-1
Author(s):  
Peter J. Bussey
Keyword(s):  
Big Bang ◽  
Origin And Evolution ◽  
Evolution Of The Universe ◽  
The Universe

Das Präphysiche Stadium und der Anfang der Welt

1998 ◽  
pp. 74-80
Author(s):  
Malgorzata Szczesniak
Keyword(s):  
Physical State ◽  
Big Bang ◽  
Evolution Of The Universe ◽  
Time Period ◽  
The Creation ◽  
The Absolute ◽  
The Big Bang ◽  
The Universe ◽  
Natural Way

This paper concerns the main physical, philosophical and existential aspects of the ‘pre-physical’ stage in the evolution of the universe. I will discuss the ways that contemporary cosmology tries to: (1) solve the problem about the time period of the ‘pre-physical’ state; (2) answer the question whether the beginning of time was at the same time as the beginning of the existence of the Universe; (3) answer another whether the Big Bang was an absolute beginning of the existence of the Universe or only a beginning of some stage of its evolution; (4) respond to another question whether the absolute beginning of the Universe inevitably implies its creation by God or whether it allows for the possibility of the creation of the Universe in a natural way; and (5) discuss the issue of the ‘singular’ moment. All of these questions, in particular the last one, will be discussed with reference to the latest achievements in the fields of physics and cosmology.

scholarly journals Abundances of hydrogen and helium isotopes in the Protosolar Cloud

2009 ◽  
Vol 5 (S268) ◽  
pp. 71-79 ◽  
Author(s):  
Johannes Geiss ◽  
George Gloeckler
Keyword(s):  
Solar Wind ◽  
Solar System ◽  
Big Bang ◽  
The Sun ◽  
Density Profiles ◽  
Origin And Evolution ◽  
Naturally Occurring ◽  
System 2 ◽  
The Big Bang ◽  
The Universe

AbstractFor our understanding of the origin and evolution of baryonic matter in the Universe, the Protosolar Cloud (PSC) is of unique importance in two ways: 1) Up to now, many of the naturally occurring nuclides have only been detected in the solar system. 2) Since the time of solar system formation, the Sun and planets have been virtually isolated from the galactic nuclear evolution, and thus the PSC is a galactic sample with a degree of evolution intermediate between the Big Bang and the present.The abundances of the isotopes of hydrogen and helium in the Protosolar Cloud are primarily derived from composition measurements in the solar wind, the Jovian atmosphere and “planetary noble gases” in meteorites, and also from observations of density profiles inside the Sun. After applying the changes in isotopic and elemental composition resulting from processes in the solar wind, the Sun and Jupiter, PSC abundances of the four lightest stable nuclides are given.

A critical analysis of the Big Bang Nucleosynthesis

2019 ◽  
Vol 34 (24) ◽  
pp. 1950194 ◽  
Author(s):  
Tahani R. Makki ◽  
Mounib F. El Eid ◽  
Grant J. Mathews
Keyword(s):  
Critical Analysis ◽  
Big Bang ◽  
Early Evolution ◽  
Big Bang Nucleosynthesis ◽  
Evolution Of The Universe ◽  
Chemical Potentials ◽  
Primordial Abundance ◽  
The Big Bang ◽  
The Universe

Standard Big Bang Nucleosynthesis (SBBN) represents one of the basic tools to understand the early evolution of the universe. In this paper, we reanalyze this process to focus on the so-called lithium problem. 7Li is overproduced during SBBN compared to its primordial abundance as obtained from observations. For this reason, we extend the scenarios of SBBN in two directions: (i) equating all neutrino chemical potentials and including more neutrino families, (ii) varying neutrino chemical potentials independently. Since the so-called cosmological lithium problem is not resolved on nuclear/astrophysical ground, we argue that this problem should be examined by invoking nonstandard assumptions.

Dynamical aspects of galaxy clustering

1980 ◽  
Vol 296 (1419) ◽  
pp. 339-345 ◽  
Keyword(s):  
Galaxy Formation ◽  
Gravitational Instability ◽  
Mass Density ◽  
Big Bang ◽  
Density Fluctuations ◽  
Galaxy Clustering ◽  
Origin And Evolution ◽  
Statistical Measures ◽  
Instability Theory ◽  
The Universe

Some recent work on the origin and evolution of galaxy clustering is reviewed, particularly within the context of the gravitational instability theory and the hot big-bang cosmological model. Statistical measures of clustering, including correlation functions and multiplicity functions, are explained and discussed. The close connection between galaxy formation and clustering is emphasized. Additional topics include the dependence of galaxy clustering on the spectrum of primordial density fluctuations and the mean mass density of the Universe.

scholarly journals COSMOLOGICAL BACKREACTION OF HEAVY STRING STATES

2011 ◽  
Vol 26 (35) ◽  
pp. 2615-2626
Author(s):  
G. DE RISI
Keyword(s):  
Phase Space ◽  
Particle Production ◽  
Numerical Solutions ◽  
Particle Creation ◽  
Big Bang ◽  
Smooth Transition ◽  
Massive String ◽  
Evolution Of The Universe ◽  
Scale Particle ◽  
The Universe

We propose a mechanism to have a smooth transition from a pre-Big Bang phase to a standard cosmological phase. Such transition is driven by gravitational production of heavy massive string states that backreact on the geometry to stop the growth of the curvature. Close to the string scale, particle creation can become effective because the string phase space compensate the exponential suppression of the particle production. Numerical solutions for the evolution of the Universe with this source are presented.

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