I have been thinking about the implications of modal realism for my notion of personal identity, and arrived at the conclusion that absolutely identical copies and their "runtime" do not matter to me.<br><br>Let's start with some background assumptions: There is an ensemble of structures/properties. Let's not discuss the meaning of "is". The ensemble contains all. Let's leave aside the meaning of "all". Some of the elements exhibit similarities, or correlations, such that it is possible to arrange the structures in orderly chains of elements. An element in a chain is apposed to similar elements that are either simpler or more complex. Since the number of more complex similar elements is always larger than the number of simpler similar elements, there is a certain direction along the chain, as well as branching from simpler to more complex elements. Each element is a state of our universe. Every event belongs to a tree of events that branches along an axis, which we call time. <br>
<br>Whatever it means to "be", every event exhibits that property to the same degree. Past, present and future exist equally. Time is real, yet the ensemble of all events is timeless. This is the core of modal realism.<br>
<br>Some small structures within events reflect, or correlate with, their surroundings.This special form of reflection or map of surroundings, is probably a necessary feature of awareness. In addition to correlations with surroundings, aware structures exhibit also the branching, time-axis type of correlation typical of all physical objects. Furthermore, there are higher-order correlations, or mappings present in some structures - a map of the structure itself, reflecting itself in a recursive way. This form of self-correlation may be the necessary (although perhaps not sufficient) condition for conscious experience. So you could say that consciousness is a property of self-correlated structures, existing timelessly as parts of the larger branching chains of world-states. It is possible to delineate highly complex, many-dimensional, treelike shapes, exhibiting these correlations and self-correlations, and being separate from other such timeless shapes. Each one of us is a shape like this, a miniature tree, or maybe I should say, a seedling of conscious life.<br>
<br>So what is to be done about it? After all, if the shape is timeless, its extent in time cannot be changed. Its shape is immutable. You can't change anything!<br><br>Well, a subjective experience of desire, and the experience of acting, do correlate with the shape of your past and future. If an omniscient observer were to investigate the brain structure at the base of the "tree", in a child, and find a desire for chocolate, the desire would certainly correlate with the parts of the tree corresponding to eating chocolate at later ages, going down the myriad branchings of the tree. Given time-like correlations between parts of the shape, similar inference could be performed from the future into the past, and laterally, among parts of the tree separated by space-like branching.<br>
<br>Do I make myself clear? Can you imagine a tree-like, branching, mathematical shape, a monumentally huge graph, with every single thought and feeling you had, have, and will have in all possible worlds, represented simultaneously in its nodes? Like a GLUT (Giant Look-Up Table) of you? And this is the only you, the one and unique representation and the time/place of your consciousness?<br>
<br>Since every thought and desire correlates with the shape of the tree throughout its extent, I see my thoughts, desires and actions as a form of sculpture. It is as if time existed, and my decision to write this post changed the shape of some branches of my tree of life. Every thought, every action chisel out the shape of myself. The shape itself is timeless, yet what I do correlates with the past, and the future. As I wrote in the paragraph about time - time is nothing but the existence of correlations between world-states. Causation is nothing but correlation...if you know what I mean. In case some readers might see this as just my private ravings, this notion of causality is actually accepted by some notable philosophers, e.g. it is expounded upon by Daniel Dennett in "Freedom Evolves". So my thoughts *cause* the ylem to flow into the shape of my heart's desire!<br>
<br>Thus I am the many-dimensional sculptor of my past, present and future. I do care about the size of my tree of life, which translated into time-speak means, I want to live longer. If some of my versions in at least some possible universes escape aging and live for thousands of years, it is like saying that my tree of life is tall. And those who would resolutely refuse life extension? Their trees are stunted, mere bushes, since in every possible universe they choose death.<br>
<br>But what about all those copies and "runtime"?<br><br>As I wrote above, each one of us corresponds to only one shape. Individual shapes my partially overlap, sharing some parts, and there are gazillions of physically distinguishable states in each "I", like very close relatives populating the googolplexes of universe-states, but there are no "copies". Just like there is only one square, there is only one of me-trees. You can't faithfully copy the mathematical being, a square. A square that is located in the same place, of the same size, with same relation to other mathematical shapes is still the same square. To make a copy you need to change its relationship to other structures - but maths is unchangeable. Math, the Platonic realm, can be only discovered, not changed. So if you try to make an identical copy of me, you can't do it. You can produce new nodes on my tree of life by exposing me to new stimuli - to say it timelessly, there may be correlations between your actions and the shape of my future but you can't copy the whole thing. A million brains running exactly the same thought, down to the quantum level or below, is only one brain. A million brains that are similar enough to produce the same macroscopic-level thoughts, words and actions but differing at the quantum scale may represent true copies but personally I don't care about them - they do not differ in the higher-order correlations I mentioned above as necessary for consciousness. Why bother running them if they don't materially change the shape of all my thoughts? I might object to such copies being tortured, since they would increase the measure of pain in the me-tree. Timelessly said, the preference inherent in my structure (hopefully) correlates with a small measure of quantum-level painful states and with a large number of interesting, or pleasant macrostates (i.e. groups of microstates corresponding to a single thought).<br>
<br>Sorry for inundating you-all with these half-formed and wordy musings. I feel that I still have not wrapped my mind around the notions exposed above. Perhaps other parts of my tree of life, the ones located down the time-dimension, have a clearer understanding. Maybe this post does correlate with the existence of such mind-states. <br>
<br>Only time will tell :)<br><br>Rafal<br>