Mysteries of Modern Physics: Time

3.4
Time rules our lives. From the rising and setting of the sun to the cycles of nature, the thought processes in our brains, and the biorhythms in our day, nothing so pervades our existence and yet is so ifficult to comprehend. Time seems to be woven into the very fabric of the niverse. But why? Consider these contrasting views of time: A movie of a person diving into a pool has an obvious arrow of time. When the movie is played backward, everyone recognizes that it shows an event that would never occur in the real world. But zoom in on any part of the scene at the atomic scale and the movie wil be run backward or forward and be indistinguishable. Either way, the particle interactions are consistent with the laws of physics. Why does one movie have an arrow of time moving in only one direction and the other does not? Surprisingly, the search for an answer leads through some of the most pioneering fields of physics, including thermodynamics, relativity, quantum theory, and cosmology. The key concept is called " entropy, " which is related to the second law of thermodynamics, considered by many scientists to be he most secure law in all of physics. But that 's nly the beginning, since the quest for the ultimate theory of time draws on such exciting ideas as black holes, cosmic inflation, and dark energy, before closing in on a momentous question that until recently was considered unanswerable: What happened before the big bang? In 24 riveting half-hour lectures, Mysteries of Modern Physics: Time takes you on a mind-expanding journey through the past, present, and future, guided by Professor Sean Carroll, noted author and Senior Research Associate in Physics at the California Institute of Technology.
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12
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Published January 1st 2012 by The Teaching Company

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I just bought his latest book about Time.

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Indeed, great.Note that I have een over this material from various other Great Courses lectures.

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The energy must become equilibrium, which in turn there will be a flow of energy, and this creates useful work.In the second part, the second law of thermodynamics, the presenter also discusses Laplace 's demon, Boltzmann demon, Boltzmann 's brain, etc., all of which I could gather limited information, making my attempt to explain them disastrous; so I will skip that part.In the third part, Sean Caroll talks about Relativity and the aspects of modern cosmology.

He knows that our explanations on 'time' and what caused the Big Bang are not satisfying yet, and we need better theories and observations in order to predict the nature of time and our universe.

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his is catalogu of 24 lectures that carry a heavy dose of thermodynamics, relativity, quantum theory, and cosmology.

When I first started the lectures I thought eve the relativity of time in regar to gravity, velocit, and travel speed were mysteries to be understood.

he argumen that kept getting asked throughout the lectures was what caused the low entropy state of the multivers in the past.

In any ways the mystery being explored in this lectures is n't time, but even the change in entropy.All fundamental laws of physics allow time to be either positive or negative.

The direction is sometimes called " the arrow of time, " but really it 's he moving from lower to higher entropy.

he whole universe has been fueled by the hange in entropy for the last 13 billion years.

This final lecture reviews three possible explanations as to why the universe egan with low entropy at the big bang.

It exerts force all the way across the universe and even distorts time and the ath of photons ( i.e. light).

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I listened to these lectures on Audible.From Classical Newtonian physics to the more modern interpretation of quantum mechanics, time does not have direction.

So what accounts for our directional experience with time? The stars of he show are Boltzmann, entropy and the Big Bang.

Anothe Big Bang- an extremely low entropy state.

What accounts for the low entropy state during Big Bang?

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© Nicole Waggonner