Download PDF , by John Gribbin
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, by John Gribbin
Download PDF , by John Gribbin
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Product details
File Size: 1359 KB
Print Length: 35 pages
Simultaneous Device Usage: Unlimited
Publication Date: July 31, 2016
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B01JGM5T4E
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Amazon Best Sellers Rank:
#152,236 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
… as Richard Feynman was fond of pointing out, no one UNDERSTANDS quantum mechanics.†The author, John Gribbin, provides this quote, and I found it a most useful one to keep it in mind while reading a book that contains several concepts that are counterintuitive, to say the least.Thanks to a fellow, one-time Amazon reviewer, I was introduced to the writings of John Gribbin, in particular, 13.8: The Quest to Find the True Age of the Universe and the Theory of Everything, a very well-written book on the quest for determining the age of the universe, with the title being its age, followed by a “billion years.â€TIME. So many of us only want to “kill†it. Many others wish they could be allocated a double dose, and simply take that which others wish to “kill.†And who amongst us does not relish a fantasy of reversing it… going back in time, and making a particular decision a bit differently?Gribbin takes us to southwestern Italy, in the 5th Century BCE. A Greek, by the name of Zeno. Amazing, considering at the time, most folks were engaged full time in agriculture, eking out a living with the goats, and some wheat, with enough surplus left over to allow a few, like Zeno to ponder the nature of time. He was famous for his paradoxes… like how can a hare ever catch a tortoise if he is running twice as fast, closing half the distance… Zeno claimed that motion is an illusion… an arrow cannot move from one position to another. Time may “point,†but it does not move. Hum. Most people conclude that Zeno produced some pretty word-play. Gribbin suggests giving him “a second look,†since he may very well have been right.Using Zeno as the starting point, Gribbin recaps the history of our understanding of the physical world, naturally featuring Newton, and the “classical laws,†and on to Einstein, relativity and quantum mechanics, those aspects of the physical world that no one can truly understand as Feynman asserted. Maxwell, and the lesser known Boltzmann are also featured. The author states: “The standard understanding of why we perceive a preferred direction of time – the arrow of time – stems from the industrial revolution of the nineteenth century, and in particular the development of steam engines.†Gribbin segues into thermodynamics, entropy, how the world is winding down, entropy, and the impossibility of a broken glass of water to put itself back together… because time has moved “forward.†Or, has it, and is there a slender, very slender possibility that the glass could reconstitute itself? A preposterous idea, on the macro level, far less so, if we consider experimental results on the very, very teeny level, as in the sub-atomic. Time as the 4th dimension. “Time just is,†as Gribbin asserts.The author has inspired me to read two other works, admittedly quite different, that deal with our understanding of time: Kurt Vonnegut’s Slaughterhouse-Five: A Novel (Modern Library 100 Best Novels) and the astrophysicist Fred Hoyle’s October the First Is Too Late (Valancourt 20th Century Classics). Hoyle was one of the first authors that I have read, way back, in high school.I’ve recently finished Marcel Proust’s rather thorough examination (and search for) that ever so elusive time that has become lost. A unified field theory? Reconcile Proust’s and Gribbin’s views! I don’t think I have enough time left for that project. But with both their guidance, I might be able to tackle the much smaller project of an ill-considered decision in the Ile-de-France, and that on the macro level, the glass does not become reconstituted, the arrow of time points FORWARD, and we can only hope it moves but slowly. For Gribbin’s insights, 5-stars.
Gribbin is spectacular at explaining recondite matters in a way that anyone can understand. He gets into some heady ideas about the physics of time without requiring a single equation. As entertaining as it is enlightening, this is first-rate science writing.
Gribbon's essay is short enough that can be easily digested in a single sitting. It clearly and concisely covers a number of competing theories about the mystery of time. For those reasons I gave the essay four stars.Unfortunately, it appears that the author adheres to the Block Universe model, which holds that the "arrow of time" is an illusion. According to BU model, space-time is likened to a block of cheese, where events are like pieces of string, called world lines, embedded in the cheese. The lengths and positions of the world lines are fixed within the block, so time does not actually unfold ; past, present and future coexist as an unchanging eternity. This implies time is fundamentally reversible, as in LaPlace's clockwork universe where all information regarding the future has already been encoded in the past and present.The fallacy with the BU model is that the total amount of information contained within the "block" must remain constant along the entire "time axis"; however, this is demonstrably false. First, information is equivalent to entropy, and like entropy it cannot be constant. Every physical process is inherently irreversible with an amount of entropy/information that must increase between the cause and effect. Thus, if information were to remain constant according to the BU mode, it would be inconsistent with causality. Second, it has been repeatedly proven by experiments that measurements of quantum states are entirely stochastic; there are no hidden variables that determine what the next quantum state will be. Each observation of a quantum generates a brand-new set of bits of information that simply did not exist prior to making the observation. Furthermore, not only is the future fundamentally unknowable because there is insufficient information available in the present; there is no mechanism that can erase information in the present in order to "go back to the past" when there was less information. Time is unidirectional and there truly is an arrow of time, and it is not just an illusion.
An exquisitely laid out scientific treatise of the true nature of time (no spoilers, but I will say the light came on in my head more than once). But just when the story gets to the heart of the matter, this short book ends. I kept pressing the next page button on my Kindle wondering when the discussion would pick up. Yes, there were conclusions, but those conclusions needed more context - a Q&A, maybe a list of "whatabout..." questions that Mr. Gribbin would answer. Alas, the story just ended with the usual message from Amazon: "You've finished". Perhaps much like time, we shouldn't expect a continuous flow from cause to effect. Still... I think I'll snoop around the internet for a discussion group.
John Gribbin leads the lay reader through a philosophical discussion of time and describes the block universe along with other theories and even recommends a science fiction book that discusses the concept of time. There is enough reference material for those with the knowledge and ability to search more in depth. The main audience for the book is the lay person. Reading it gives the reader a history of the research, problems encountered, and an appreciation for the implications of the dual nature of entities as both wave and particle. Those who wish to become scientists and engineers will have to study their college textbooks and do the actual experiments. The book is a good introduction to the subject matter and is good for general knowledge.
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