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We extend the usual gravitational action principle by promoting the bare cosmological constant (CC) from a parameter to a field which can take many possible values.
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J.D. Barrow and F.J. Tipler, The Anthropic Cosmological Principle
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S. Weinberg, Phys. Rev. Lett 59
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G. Efstathiou, Mon. Not. R. astron. Soc. 274
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M. Tegmark et al. , Phys. Rev. D 73
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This is unlike the ever-present Λ \Lambda model of R. Sorkin, Int. J. Theo. Phys. 36
2007
Cited alongside, same era.
Cited in the paper.
The sum over matter and metric configurations in Z [ ℳ ] Z[\mathcal{M}] is performed with the same set of free boundary data, { Q A } \left\{Q^{A}\right\} , kept fixed as in the definition of Z Λ [ M ] Z_{\Lambda}[M]
Cited in the paper.
We neglect black hole boundaries. They make a negligible contribution to the surface term in Eq.(2)
Cited in the paper.
The singular nature of ∂ ℳ I \partial\mathcal{M}_{\mathrm{I}} mandates an extra surface term on ∂ ℳ I \partial\mathcal{M}_{I} .See [ 9 ] for further details. The initial state and hence all terms on ∂ ℳ I \partial\mathcal{M}_{\mathrm{I}} are λ \lambda -independent and so these terms make no contribution to Eq.( 1
Cited in the paper.
Differently placed observers are most to observe when t ∼ t ms t\sim t_{\rm ms} , where t ms ∼ O ( 10 10 yrs ) t_{\rm ms}\sim O(10^{10}\,{\rm yrs}) is the main-sequence lifetime; they will all most likely observe Λ ∼ O ( t ms − 2 ) \Lambda\sim O(t_{\rm ms}^{-2}) in our model
Cited in the paper.
G. W. Gibbons and N. Turok, Phys. Rev. D 77
2008
Later among the works it cites.
D.J. Shaw and J.D. Barrow, arXiv: 1010.4262 (2010)
2010
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