What Came Before the Big Bang?Why do we remember the past, but not the future?…

What Came Before the Big Bang?

Why do we remember the past, but not the future? Why don’t we meet people who grow younger as they age? Why do things, left by themselves, tend to become messier and more chaotic? What would Maxwell’s Demon say to a Boltzmann Brain? What came before the Big Bang?
The answers can be traced to the moment of the Big Bang — or possibly before, discussed below by rock-star theoretical physicist Sean Carroll, at the California Institute of Technology. His research involves theoretical physics and astrophysics, focusing on issues in cosmology, field theory, and gravitation.

Time pervades our lives — we keep track of it, lament its loss, put it to good use. The rhythms of our clocks and our bodies let us measure the passage of time, as a ruler lets us measure the distance between two objects. But unlike distances, time has a direction, pointing from past to future. From Eternity to Here examines this arrow of time, which is deeply ingrained in the universe around us. The early universe — the hot, dense, Big Bang — was very different from the late universe — cool, empty, expanding space — and that difference in felt in all the workings of Nature, from the melting of ice cubes to the evolution of species.

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