Abstract
Branching along the time dimension provides a dynamic, four-dimensional, treelike space-time structure that explains many features of the physical world. The list includes temporal asymmetry and directionality, time flow and the existence of “now,” physical versus logical possibility, the openness of the future, quantum probabilities, and superpositional collapse. This chapter discusses these and how agents use the open future in order to act intelligently and rationally.
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Notes
- 1.
McCall (1994) contains a detailed account of the branching space-time model discussed here. Belnap (1992) and Belnap et al. (2001) introduce a similar model, the details of which differ from McCall’s. The two models bear only a superficial resemblance to the Everett-Wheeler many-worlds interpretation of quantum mechanics.
- 2.
- 3.
Concerning the concepts of physical possibility and physical necessity, see McCall (1969).
- 4.
Decenary trees are described in McCall (1994), pp. 88–92.
- 5.
- 6.
- 7.
Branching space-time does in fact allow for particular instances of 100% determinism, in cases where all the branches above an A node are B branches. For example, in all instances where the two ends of a copper wire are connected to a battery, current flows in the wire.
- 8.
McCall (2009), pp. 146–48 and McCall (forthcoming).
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McCall, S. (2013). The Open Future and Its Exploitation by Rational Agents. In: Correia, F., Iacona, A. (eds) Around the Tree. Synthese Library, vol 361. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5167-5_6
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