In Barry Loewer, Brad Weslake & Eric Winsberg (eds.), Time's Arrows and the Probability Structure of the World. Harvard University Press (forthcoming)

Authors
Sean M. Carroll
California Institute of Technology
Abstract
It is commonplace in discussions of modern cosmology to assert that the early universe began in a special state. Conventionally, cosmologists characterize this fine-tuning in terms of the horizon and flatness problems. I argue that the fine-tuning is real, but these problems aren't the best way to think about it: causal disconnection of separated regions isn't the real problem, and flatness isn't a problem at all. Fine-tuning is better understood in terms of a measure on the space of trajectories: given reasonable conditions in the late universe, the fraction of cosmological histories that were smooth at early times is incredibly tiny. This discussion helps clarify what is required by a complete theory of cosmological initial conditions.
Keywords Cosmology  Fine-Tuning
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References found in this work BETA

The “Past Hypothesis”: Not Even False.John Earman - 2006 - Studies in History and Philosophy of Modern Physics 37 (3):399-430.

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Citations of this work BETA

Does Inflation Solve the Hot Big Bang Model׳s Fine-Tuning Problems?C. McCoy - 2015 - Studies in History and Philosophy of Modern Physics 51:23-36.
The Implementation, Interpretation, and Justification of Likelihoods in Cosmology.C. D. McCoy - 2018 - Studies in History and Philosophy of Modern Physics 62:19-35.

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