Many Worlds in One: The Search for Other Universes. Alex Vilenkin, Author. Hill & Wang $24 (p) ISBN Many Worlds in One has ratings and 20 reviews. John said: I’m not sure who is the better scientist, but in terms of the prose required to address thi. RENOWNED cosmologist Alex Vilenkin, who is director of the Tufts University Institute of Cosmology in Massachusetts is known for his theory.

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First, we will need to map the landscape. There are 8 reviews from readers on Amazon, all gave the book 5 stars, well justified. Sean Carroll is credited with the following story: He also describes the reaction to his anthropic arguments back during the years when these were not all the rage like they are now:.

We find that for such probability distributions, the likelihood that we live in a typical, worls universe is generally quite small. Thank you very much, Mark. Of course science provides a way to answer that: The book chapter introduces relativity and cosmology, and chapters discuss the central ideas of eternal cosmic inflation: More great sites from Kalmbach Media: With humankind reduced to absolute cosmic insignificance, our descent from the center of the world is now complete.

## General Relativity and Quantum Cosmology

Hence, for cars to exist, the roads must possess very constrained, predictable features. Now, we all know the low multipole of the CMB is underpowered…people write tons of papers trying to come up with alternative theories to explain it. He has made seminal contributions to the theory of cosmological inflation, the idea that the universe may contain topological remnants from particle physics phase transitions, to quantum cosmology, and to many other central topics.

String theory and its landscape are the ultimate obfuscation with which to sink any questions anyone asks about physics.

Since no one can find the solution explicitely because of Douglas Complexity paper I think it is indeed fair to say the whole subject is at its end. One finds this tone continued through the entire book; it is refreshing and adds to the appeal of the subject matter.

There are an infinite number of possible a,ex, and trying to make this finite so one can do statistics requires putting in cutoffs, with results then strongly depending on the cutoff. Nov 26, Richard rated it liked it. These traits are central to his claim that there are a finite number of histories, thus an infinite vilenmin of copies of those histories.

During inflation, two rival processes were occurring; false vacuum decay characterized by a half-life, and false vacuum-space-multiplication expansion characterized by its doubling time. I will quote the author from the fly leaf of the book: Vilenkin is a very good writer, he writes in a literary language which is normally reserved for fiction. Unless you really have something new to say, please resist the temptation to start rehashing various aspects vielnkin the anthropic principle every time the landscape gets mentioned here.

Return to Book Page. This book is not yet featured on Listopia. To this end Alex devotes a chapter to string theory and, in particular, to the idea of the landscape as an example of how many different vacua, with different values of the cosmological constant might arise. In particular, we have no idea whether string theory really allows things like nucleation of baby universes, etc.

John Peterson rated it it was amazing Nov 16, The large numbers of these vacua make any attempts to identify ones that agree with the real world computationally completely intractable. The response I got from other colleagues was also less than enthusiastic. A breezy survey of the view you get from the top of a mountain called Cosmic Inflation Theory. Look on the bright side, Peter. Open Preview See a Problem? It’s worth reading for knowing the big ideas behind Quantum Cosmology.

Michael rated it really liked it Mar 03, There used to be a time when finding vilemkin something was unbelievably rare was regarded as good reason for ignoring that possibility…. You have one such measurement…. For example, in electroweak vacuum, electrons are mass-less and are like neutrinos, in addition electromagnetic, and weak interactions have the same strength and manifested as a single force. I was a little surprised by this, since it seems to me to be merely a plain statement of what science really means.

It is a perfectly logically possibility that some features of our universe are anthropically determined. This means that the inflation never ends pne the multiverse and the volume of inflating regions keeps growing unabated resulting in eternal inflation. A theoretical search for parallel universes This book is not for the faint hearted; it requires basic knowledge of physics and cosmology.

### Many Worlds In One | Not Even Wrong

If you are specifically interested in anthropic discussion, there is a great piece from the book on Edge. Is this Copernicus coming back to haunt us? Here, the discussion is juxtaposed against the backdrop of ancient creation myths.

I think the cancer of corruption in physics is that in default of real understanding, obfuscation onr preferred. I think Vilenkin exaggerates the entropy problem in these cyclic models, but surely there wasn’t room for him to totally explain his reasoning in this book, and it would have taken him far afield from his main emphasis.

I was disheartened by such a cool reception…. It does appear Steinahardt likes to get under some peoples skin. We have performed a vast computer survey of solutions to the stringy consistency apex and present their statistical implications with special emphasis on the frequency of Standard Model features.

### Alex Vilenkin – Many Worlds in One – Cosmic Variance : Cosmic Variance

There are two types of vacuum; false vacuum and true vacuum. Cosmologists ask many difficult questions and often vilennkin up with strange answers. Vilenkin provides us not only with a fascinating account of the physics, but also with a fun and, in places, humorous picture of life as a scientist. According to this theory, at any given moment some distant parts of the multiverse are filled with false vacuum and are undergoing exponential inflationary expansion, a,ex regions like ours the inflation has ended inflation must not be confused with normal universe expansion.

Linking it to the landscape is like tieing your boat to the Titanic. July 4, at 7: