The habitable epoch of the early Universe

@article{Loeb2014TheHE,
  title={The habitable epoch of the early Universe},
  author={Abraham Loeb},
  journal={International Journal of Astrobiology},
  year={2014},
  volume={13},
  pages={337 - 339}
}
  • A. Loeb
  • Published 2 December 2013
  • Physics
  • International Journal of Astrobiology
Abstract In the redshift range 100≲(1+z)≲137, the cosmic microwave background (CMB) had a temperature of 273–373 K (0–100°C), allowing early rocky planets (if any existed) to have liquid water chemistry on their surface and be habitable, irrespective of their distance from a star. In the standard ΛCDM cosmology, the first star-forming halos within our Hubble volume started collapsing at these redshifts, allowing the chemistry of life to possibly begin when the Universe was merely 10–17 million… 
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34 Citations

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References

SHOWING 1-10 OF 57 REFERENCES
The First Stars
Abstract The formation of the first generations of stars at redshifts z ≥ 15 − 20 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here…
21 cm cosmology in the 21 st century
Imaging the Universe during the first hundreds of millions of years remains one of the exciting challenges facing modern cosmology. Observations of the redshifted 21 cm line of atomic hydrogen offer…
21 cm cosmology in the 21st century
TLDR
This review detail the physics that governs the 21 cm signal and describe what might be learnt from upcoming observations, and generalize the discussion to intensity mapping of other atomic and molecular lines.
How small were the first cosmological objects
The minimum mass that a virialized gas cloud must have in order to be able to cool in a Hubble time is computed, using a detailed treatment of the chemistry of molecular hydrogen. With a simple model…
The first stars in the Universe
Large telescopes have allowed astronomers to observe galaxies that formed as early as 850 million years after the big bang. We predict when the first star that astronomers can observe (i.e. in our…
An observational test for the anthropic origin of the cosmological constant
The existence of multiple regions of space beyond the observable Universe (within the so-called multiverse) where the vacuum energy density takes different values has been postulated as an…
Cosmological Formation of Low-Mass Objects
We investigate the early formation of bound objects with masses comparable to the cosmological Jeans mass (10^5 solar masses). We follow the growth of isolated spherically symmetric density peaks…
Habitable zones around main sequence stars.
TLDR
The results suggest that mid-to-early K stars should be considered along with G stars as optimal candidates in the search for extraterrestrial life.
Planck 2013 results. XVI. Cosmological parameters
This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck…
Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
We calculate the generic spectral signature of an early population of massive stars at high redshifts. For metal-free stars with mass above 300 M☉, we find that the combined spectral luminosity per…
...
...