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Even though it is difficult to understand at times and even though the writing style is a little too academic and research oriented, ‘Time Reborn’ is a genuine attempt at trying to popularize the notion of time with respect to Physics and its future.

It’s clearly not whether the theories have a time parameter in them, but it seems in some places to mean that time is treated as a whole, as it is in the “block universe” of relativity, and in others that the l Annoyingly poorly argued book about moving beyond current ideas of time in physics, with some interesting ideas.

Some interesting ideas marred by astonishingly sloppy reasoning. Lists with This Book.

Of course I know that philosophers love to puzzle these things out and recognise that again, 20thC logic can rigorise and interrogate a lot of these seemingly common-sensical ideas to show them as specious, groundless or only applicable in certain cases I. In part, it is an argument not rooted so much on science itself as on the field of natural philosophy and smlin grounded in the work of philosopher Gottfried Leibniz.

Time Reborn | Not Even Wrong

Again, mathematical simplicity is seen as an artifact of approximation, not indication of something fundamental. Of course, this opens up another question. Dec 12, Adam rated it it was amazing Recommends it for: From the Crisis in Physics to the Future of the Universe has the potential to be more egregiously hyperbolic but for the fact that most readers are unlikely to be current on the cosmological scuttlebutt.


BTW, anyone who claims that he has read the book in these few days — should reconsider.

How did they come about? A Caltech archive has the text of what Feynman says there: As a theist, I disagree with Doctor Smolin’s naturalism but at the same time respect that he up front about it. As the universe by definition includes everything, this concept is self-contradictory. How do you start with absolutely no assumptions – not even that there is a reality – and by some sequence of developments that begin completely randomly, following no rules whatsoever such as a rule that says there is or isn’t a reality or that things do or do not exist – so why can’t they spontaneously “begin” to?

Time Reborn – Lee Smolin

Then why do we need all the cute mathematical tricks to kee up shape dynamics? An undifferentiated, indeed ill-defined, reality might be perfectly symmetrical in the sense that no transformations result in change; this is the closest thing I can come up with to an “initial condition” that begs no questions.

That seems quite reasonable, given that space is expanding from the Big Bang. In a footnote he explicitly argues that the problem with string theory was too much symmetry: The big exception to my praise for his literary style is that he repeats his thesis over and over again, beating you over the head with it.

So too, we don’t need to invoke Anthropic Principle. I would like to ask Lee the following question, if he is still checking this blog for discussion and wishes to respond.

So whether Smolin’s application of those rules is logically rigorous, or if his misapplies them is outside my skill area. Can you imagine a precedence process by which the quantum theory called Causal Dynamical Triangulations arises? There is no contradiction between the formulas we use which don’t need time, and the world we live in, which does. What viable proposals are there where GR and QT are not taken to be absolutely true, but where some dynamical process tends to push violations of these laws towards zero?


Lee Smolin proposes interesting solutions to many of the problems that physics faces today. At the time, this must have seemed crazy to many people, but tume it makes perfect sense.

Time Reborn by Lee Smolin – review

Hence you can trade a relativity of time with fixed sizes lwe a relativity of size with fixed times. If we just went by the laws of electromagnetism, it could be otherwise.

Jun 26, Rodney Harvill rated it really liked it Shelves: Before this book, the kind of books I read were almost meant for laymen and they never really presented underlying concepts about which Physicists are actually researching and publishing every year. This has been put together with our modern understanding of renormalization, according to which non-renormalizable theories make perfect sense as effective theories.

I was unpersuaded by Smolin’s attempt to defeat ,ee anthropic argument in Chapter So is there an offline, realworld version of physics that cannot be scaled up from the pageclick-esque data our mathematical formulae currently capture? Smolin sets up the anthropic tims as a fallacy by making it go through the intermediate step “the universe has lots of galaxies” galaxies being necessary for there to be rebon and hence uswhich is itself observable, and so then the anthropic premise falls out entirely.

Other people are less sure. Either we are in a rebrn place, or the universe itself is expanding and it will look similar from every point in space.

In discussing the emergence of space, he points out that it appears to have only a few dimensions. He does a wonderful job of introducing subjects such as thermodynamics or quantum Mystics, philosophers, poets and 20th century physicists all agree – time is an illusion.