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Single Idea 23004

[filed under theme 27. Natural Reality / D. Time / 2. Passage of Time / g. Time's arrow ]

Full Idea

Primitivism is the view that time has a direction, and that its having that direction is intrinsic to time itself. Reductionism is the view that time has a direction, but its having that direction is reducible to something else.

Gist of Idea

The direction of time is either primitive, or reducible to something else

Source

Baron,S/Miller,K (Intro to the Philosophy of Time [2019], 5.3.1)

Book Ref

Baron,S/Miller,K: 'Introduction to the Philosophy of Time' [Polity 2019], p.130

A Reaction

The general suggestion for the second theory is that time's direction reduces to some aspect of the laws of nature. I strongly incline to the primitive view. Something's got to be primitive.

The 24 ideas with the same theme [that time seems to have one fixed direction]:

22954 Newtonian mechanics does not distinguish negative from positive values of time [Newton, by Coveney/Highfield]
22908 When one element contains the grounds of the other, the first one is prior in time [Leibniz]
14935 The direction of time is grounded in the direction of causation [Reichenbach, by Ladyman/Ross]
22947 An ordered series can be undirected, but time favours moving from earlier to later [Le Poidevin]
22952 If time's arrow is causal, how can there be non-simultaneous events that are causally unconnected? [Le Poidevin]
22953 Time's arrow is not causal if there is no temporal gap between cause and effect [Le Poidevin]
22951 If time's arrow is psychological then different minds can impose different orders on events [Le Poidevin]
22948 There are Thermodynamic, Psychological and Causal arrows of time [Le Poidevin]
22949 Presumably if time's arrow is thermodynamic then time ends when entropy is complete [Le Poidevin]
22950 If time is thermodynamic then entropy is necessary - but the theory says it is probable [Le Poidevin]
22975 We must explain either the existence of a time direction, or our psychological sense of it [Price,H]
13440 Causation is the power of one property to produce another, and this gives time its direction [Esfeld]
22910 To define time's arrow by causation, we need a timeless definition of causation [Bardon]
22909 We judge memories to be of the past because the events cause the memories [Bardon]
22904 The psychological arrow of time is the direction from our memories to our anticipations [Bardon]
22906 The direction of entropy is probabilistic, not necessary, so cannot be identical to time's arrow [Bardon]
22907 It is arbitrary to reverse time in a more orderly universe, but not in a sub-system of it [Bardon]
19951 Entropy is puzzling, so we may need to build new laws which include time directionality [New Sci.]
20470 Only heat distinguishes past from future [Rovelli]
23003 Static theories cannot account for time's obvious asymmetry, so time must be dynamic [Baron/Miller]
23004 The direction of time is either primitive, or reducible to something else [Baron/Miller]
23005 The kaon does not seem to be time-reversal invariant, unlike the rest of nature [Baron/Miller]
23006 Maybe the past is just the direction of decreasing entropy [Baron/Miller]
23010 We could explain time's direction by causation: past is the direction of causes, future of effects [Baron/Miller]