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Stephen, H. (1994) The No Boundary Condition and the Arrow of Time. In: Hawiwell, J.J., Perez-Mercarder, J. and Zurek, W.H., Eds., Physical Origins of Time Asymmetry, Cambridge University Press, Cambridge, UK, 346-356

has been cited by the following article:

• TITLE: Defining Arrow of Time at the Start of Inflation by Expansion of Entropy in a Taylor Series and Examining Initial Conditions

  AUTHORS: Andrew Beckwith

  KEYWORDS: Arrow of Time, Cosmological Bounce, Information, Entropy

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.7 No.3, June 4, 2021

  ABSTRACT: First, we do a Taylor series expansion of Entropy. Afterwards we define the arrow of time. After that, we define what terms we will analyze in the Taylor series expansion of entropy to help in finding initial conditions which may allow for the earliest possible identification of the Arrow of Time in cosmology. Definition of the arrow of time will allow choosing different initial starting points. That is, that in the actual equations of classical GR, there is no reason to have time asymmetry after given initial conditions. Time asymmetry is built into initial conditions and we start to explore which initial conditions may assist in evaluating contributions to Entropy via an analysis of which terms in a Taylor series survive, and what their sign and contribution values are.