Relative likelihood for life as a function of cosmic time

@article{Loeb2016RelativeLF,
  title={Relative likelihood for life as a function of cosmic time},
  author={Abraham Loeb and Rafael Alves Batista and David Sloan},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2016},
  volume={2016},
  pages={040 - 040}
}
Is life most likely to emerge at the present cosmic time near a star like the Sun? We address this question by calculating the relative formation probability per unit time of habitable Earth-like planets within a fixed comoving volume of the Universe, dP(t)/dt, starting from the first stars and continuing to the distant cosmic future. We conservatively restrict our attention to the context of ``life as we know it'' and the standard cosmological model, ΛCDM . We find that unless habitability… 
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