Steady state eternal inflation

@article{Aguirre2002SteadySE,
  title={Steady state eternal inflation},
  author={Anthony Aguirre and Steven Gratton},
  journal={Physical Review D},
  year={2002},
  volume={65},
  pages={083507}
}
Since the advent of inflation, several theorems have been proven suggesting that although inflation can (and generically does) continue eternally into the future, it cannot be extended eternally into the past to create a ``steady-state'' model with no initial time. Here we provide a construction that circumvents these theorems and allows a self-consistent, geodesically complete, and physically sensible steady-state eternally inflating universe, based on the flat slicing of de Sitter space. This… 

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