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Single Idea 23005
[filed under theme 27. Natural Reality / D. Time / 2. Passage of Time / g. Time's arrow
]
Full Idea
The laws of nature are time-reversal invariant, with the small exception of the kaon (a type of sub-atomic particle)
Gist of Idea
The kaon does not seem to be time-reversal invariant, unlike the rest of nature
Source
Baron,S/Miller,K (Intro to the Philosophy of Time [2019], 5.3.2)
Book Ref
Baron,S/Miller,K: 'Introduction to the Philosophy of Time' [Polity 2019], p.132
A Reaction
If that fact about the kaon were very secure indeed, then that would mean the collapse of the claims about the time-invariance of the laws. Since time-invariance is still routinely asserted, I assume it is not secure.
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]
|