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Einstein tried a unification theory; he failed because there is no way to get there while allowing space-time to be a variable. If you do not abandon causality and consider space-time as flat and not variable, it is easy to show how all the forces in the universe derive from the same thing. I'll write one up and post it in the new theories forum. Here is the start of it.
I think the concept of a Grand Unified Theory has nothing whatever to do with a description of conciousness. This could be even trying to conflate Physics with Metaphysics. I know that Roger Penrose believes that the human brain may use some form of quantum computing to provide the its level of complexity, but this is not a view that is widely held. Although much of the way the brain function is far from being fully understood, I suspect a majority of physicists would not say that any new physics is required to explain its attributes. I am afraid that human beings rather like to think of themselves as superior to other animals in such a way as to make them distinct - it certainly reduces many ethical issues. But it is much more likely that there is a continuum of development states in the brains of all creatures from insects to homo-sapiens. The discrete differences resulting from evolution are unlikely (IMHO) to have occurred from any change in anything so fundamental as the adoption of new physical phenomena within the brain's basic operating mechanisms. It seems to me that it is just organisation and complexity that differentiates the brains of species. There also is no evidence to suggest that other species do not possess self awareness or conciousness too, at least to some degree.So whilst I would accept that physical laws have to explain the functioning of the world, there is no intention in the world of physics to directly explain such high level functions. They are more to do with the enabling of the low level structures. It is not possible to understand all the behaviour of a transistor without some understanding of physics and, at a deeper level, quantum mechanics, but you do not need to understand any of this to see how a computer programme functions based on logic gates and memory. In this respect I think it perfectly fair to have a Grand Unified Theory that says nothing whatever about conciousness.