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Paper   IPM / Astronomy / 14572
School of Astronomy
  Title:   Ghost inflation and de Sitter entropy
  Author(s): 
1.  Sadra. Jazayeri
2.  Shinji. Mukohyama
3.  Rio. Saitou
4.  Yota. Watanabe
  Status:   Submitted
  Journal: JCAP
  Year:  2016
  Supported by:            ipm IPM
  Abstract:
In the setup of ghost condensation model the generalized sec ond law of black hole thermodynamics can be respected under a radiatively stable assumption that couplings between the field responsible for ghost condensate and matter fields such as those in the Sta ndard Model are suppressed by the Planck scale. Since not only black holes but also cosmology a re expected to play important roles towards our better understanding of gravity, we consider a c osmological setup to test the theory of ghost condensation. In particular we shall show that the d e Sitter entropy bound proposed by Arkani-Hamed, et.al. is satisfied if ghost inflation happene d in the early epoch of our universe and if there remains a tiny positive cosmological constant in the f uture infinity. We then propose a notion of cosmological Page time after inflation.


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