Emergence of life in an inflationary universe

Abstract

Abiotic emergence of ordered information stored in the form of RNA is an important unresolved problem concerning the origin of life. A polymer longer than 40--100 nucleotides is necessary to expect a self-replicating activity, but the formation of such a long polymer having a correct nucleotide sequence by random reactions seems statistically unlikely. However, our universe, created by a single inflation event, likely includes more than $10^{100}$ Sun-like stars. If life can emerge at least once in such a large volume, it is not in contradiction with our observations of life on Earth, even if the expected number of abiogenesis events is negligibly small within the observable universe that contains only $10^{22}$ stars. Here, a quantitative relation is derived between the minimum RNA length $l_{\min }$ required to be the first biological polymer, and the universe size necessary to expect the formation of such a long and active RNA by randomly adding monomers. It is then shown that an active RNA can indeed be produced somewhere in an inflationary universe, giving a solution to the abiotic polymerization problem. On the other hand, $l_{\min }$ must be shorter than $\sim$20 nucleotides for the abiogenesis probability close to unity on a terrestrial planet, but a self-replicating activity is not expected for such a short RNA. Therefore, if extraterrestrial organisms of a different origin from those on Earth are discovered in the future, it would imply an unknown mechanism at work to polymerize nucleotides much faster than random statistical processes.

arXiv comment9 pages, 1 figure. matches the published version from Scientific Reports

References in corpus (12)

• How long before the end of inflation were observable perturbations produced?
• Improved Estimates of the Milky Way's Stellar Mass and Star Formation Rate from Hierarchical Bayesian Meta-Analysis
• The Rest-Frame Optical Luminosity Density, Color, and Stellar Mass Density of the Universe from z=0 to z=3
• Origin of the RNA World: The Fate of Nucleobases in Warm Little Ponds
• Constraining the Time Interval for the Origin of Life on Earth
• A Horizon Ratio Bound for Inflationary Fluctuations
• Bayesian analysis of the astrobiological implications of life's early emergence on Earth
• Does the rapid appearance of life on Earth suggest that life is common in the Universe?
• Advances in exoplanet science from Kepler
• Panspermia, Past and Present: Astrophysical and Biophysical Conditions for the Dissemination of Life in Space
• Role of stellar physics in regulating the critical steps for life
• On the Rate of Abiogenesis from a Bayesian Informatics Perspective

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