Showing posts with label arrow of time. Show all posts
Showing posts with label arrow of time. Show all posts

Tuesday, September 25, 2007

Notes on Boyd's Satan and the Problem of Evil Chapter 4B

At the end of chapter four (see here for some criticisms of the first part), Boyd, in Satan and the Problem of Evil, gives what he takes to be scientific and experiential support for his open theism - that is, evidence that is supposed to show that the future does not exist (and hence is not known in an exhaustive definite manner by God). Boyd suggests that science supports this view by appealing to the fact that most plausible interpretations of quantum theory in physics require indeterminism. But of course indeterminism - causal "openness" - is perfectly compatible with the future not being open in Boyd's sense. Indeterminism and eternalism (the view that all times past or present or future exist) are perfectly compatible. It is a common confusion not to notice this, but of course Boyd is pretty much entirely confused throughout this science section. He takes indeterminism to show that the irreversibility of time is real, however, I'm not really sure what he even means by "the irreversibility of time". I take it that he has in mind something like the arrow of time - that is, the directedness of time or the things within it. But of course, indeterminism has no direct bearing on this issue, contra Boyd. A system can be indeterministic in a past-to-future direction, a future-to-past direction, or even both. So indeterminism on its own, even quantum mechanical indeterminism, really says little if anything about Boyd's "irreversibility of time" (despite the people he cites in support of what he says - these are issues that scientists unfortunately often get as confused about as lay people). Thus, contra Boyd, quantum mechanics does not in the slightest support his views and is perfectly compatible with all manner of eternalist or anti-open theist views.

If Boyd's discussion of quantum mechanics was somewhat confused, his discussion of relativity theory is a complete mess. First of all, though, he suggests that Scripture treats God as temporal but I've dealt with these sorts of contentions in this previous post. Boyd then notes that relativity theory doesn't show that time is unreal as if that helped him. But of course those who object to theories like Boyd's based on relativity theory would mostly agree with this, so I'm not sure how this is supposed to be helpful. Boyd claims that the theory does not address the ontological status of the future but this is contentious and, I would suggest, false. For instance, say event E1 is in the absolute future of my current space-time coordinate (pretend for the moment that I'm a point-particle). Now, given relativity, any event E2 which is neither in my absolute past nor present nor "light-like" related to me will be simultaneous with me in some reference frames and not in others (these are called "space-like" related to me). So let us take an event E2 which is very close to the space-time cone carved out by my absolute future. There are parts of my absolute future which, in some reference frames are simultaneous with E2 since they are space-like related to it. Assume E1 is space-like related to E2. Now we have two events - E1 and E2 - which lie on a simultaneity line but one of them - E2 - lies on such a line with me and the other lies in my absolute future. So there's no room to say that E1 doesn't exist since it lies on a simultaneity line with E2, which also exists, and everything which lies on a single simultaneity line is equally real. So Boyd (or Capek, who he cites) really can't get out of eternalism without reinterpreting relativity theory or treating it merely instrumentally (which sometimes Boyd confusingly sounds like he's doing, other times not - I'm not sure even he knows exactly what he's trying to do here). The rest of Boyd's discussion is basically the same as the mass of confusions he's posted on his blog and which I've addressed previously in this post.

In response to the argument that time was created with creation and since God is above creation he is above time, Boyd confusingly tries to respond to this by saying that God's experience or measurement of time is different than ours. But that doesn't even address the argument at all since it wasn't about experience or measurement in the first place - this is a metaphysical or physical argument based on the nature of God and the apparent fact that our time dimension is essentially a component of our space-time universe and hence cannot have existed outside of it. I'm really not sure what Boyd was after when he started talking about measurements here.

Boyd's argument from experience is essentially this - our experience of ourselves as free and morally responsible presupposes or is the same as an experience of ourselves as being undetermined. But of course this, again, does not support his views in the slightest. As I've said previously, indeterminism is perfectly compatible with eternalism or anti-open theism. So again, nothing Boyd says here provides even the slightest shred of evidence for his views.

Next time, more on Boyd's book...

Saturday, July 14, 2007

A Couple of Comments on Gregory Boyd on Relativity Theory

In a recent post on his blog, Gregory Boyd says the following (in comments about the recent Quincy Science and Theology Conference):

We all know thawt Relativity Theory stipulates that the NOW of every finite perspective cannot be absolutely correlated with the NOW of any other finite perspective, since WHEN an event happens depends on WHERE you are, and HOW FAST you're traveling, relative to the event in question. Yet, each finite perspective has ITSELF as a NOW, and this NOW has a real "before" and a real "after." So the universe is comprised of all finite perspectives with their own NOW and their own "BEFORE" and "AFTER." (In relativity language, each perspective has its own "time cone").Now, if we believe in an omnipresent God, God would be internally present to, and thus contemporaneous with, each finite perspective, and thus each NOW. God could therefore have -- indeed, MUST have -- a "NOW" that synchronizes and integrates ALL finite perspectives. Thus, for God, there is an absolute NOW that encompasses all NOWS. So even with Relativity Theory, I argued, God and the universe are moving forward from a real past to a real future...

But none of this actually works given Relativity as it stands (you could, of course, decide to reject Relativity as being literally true but that would be a different move, though more common). When Boyd talks about "perspectives" the only thing I can think of that he might mean is a space-time point or a space-time point considered in a particular frame of reference (given what he says about perspectives having an absolute earlier and later there really isn't much else he could mean in the context of Relativity Theory). But then, if God's NOW is just the
combination of all NOWs and each perspective is its own NOW then God's NOW would just be the whole space-time universe. How do you get a real past and future just from that or any movement from one to the other? This isn't to say that there is no past or future or anything that might be called "flow" (I think there is, though I think the tensed version of this is incorrect). It's just that Boyd's idea doesn't seem to get him anything like what he might want.

He also reports on this:

But the main topic for the day was what science has to say about the nature of time. Among the many things Robert said was that there are 7 indicators in science (as we presently understand it) that suggest that the flow of time from the past to the future is real. (This is very important since the flow of time has for the most part been considered superfluous for the physical sciences, since most equations work forward or backward. Prediction and retrodiction are essentially the same).I don't have time to explain these, but for those who are curious, these 7 arguments are:
1) Cosmological: Evidence of the big bang suggests the universe is moving from a start in the past to a finish in the future.
2) Radioactive: Light and sound diverge outward but don't converge inward.
3) Thermodynamics: Disorder increases over time. (This is the famous "Second Law of Thermodynamics").
4) Gravitational: Black holes absorb all matter in a one way motion. There are no "white holes" that reverse the process.
5) Subatomic: Anti-kaons (the anti-matter of kaons) disintegrate faster than kaons.
6) Measurement: The collapse of the quantum wave is irreversible.
And....
7) Psychological: People uniformly remember the past and anticipate the future. (This one, of course, is not a strictly scientific piece of evidence, but perhaps Mann included it simply because its a phenomenon that needs explaining.)
...At one point Mann seemed to suggest that Special and General Relativity Theory entailed a "block view" of the universe (this is the view that the past, present, and future are timelessly present as a sort of settled block. The flow of time, in other words, is not real ).
Of course, all of those things do indicate that there is flow to time - they simply do not, however, indicate that there is flow in the sense that tensed theorists like Boyd want there to be. What these things indicate is that time has an arrow, but that doesn't have much to do with whether there is a block universe or not (if by "block universe" all we mean is the view that all times are equally real, existent, and determinate - this may not be exactly what Boyd has in mind, though I'm not sure what else he might mean since a block universe in this sense does not have all times being "timelessly present"). Again, nothing here to write home about from the perspective of a tensed theorist or open theist.