STRINGS THEORY HOW TO
On the LQG side, people are still hard at work on specific sorts of degrees of freedom and how to quantize them. There is a difference in how the communities think about “what are the fundamental degrees of freedom for gravity?” On the string theory side they’ve given up on that, the answer now is that gauge-gravity duality and emergence are supposed to allow you not to care about fundamental degrees of freedom.
In the case of string theory the big selling point originally was that it gave a theory of matter, but the string community has for a long time given up on that. This has been true of LQG since the beginning. Another commonality is that both communities are focused on the gravitational field, with nothing to say about particle physics and matter in general. There are some very broad similarities between what both communities are doing, with overlaps in interest around black holes, entanglement, holography (in the form of large symmetry groups at infinity). It’s quite interesting to compare and contrast the two sets of talks. Update: Paolo Bertozzini points out to me that the LQG community has scheduled its big yearly conference LOOPS2022 at exactly the same time as the string theory community one (this week). Maldacena’s title is “What happens when you look at supersymmetric black holes for a long time?” which seems also an interesting question about the field itself. Looking at the talk titles, the most common words in the titles are “holography” and “black holes”, with the center of gravity of the subject now for a couple decades the effort to use holography to say something about black holes. Engelhardt’s title is “The Black Hole Information Paradox: A resolution on the horizon?” and Strominger’s is “Black Holes: the Most Paradoxical Objects in the Universe”. They have nothing to do with string theory, but they do make very clear what the string theory community has found to replace string theory: black holes. This year’s versions will be given by Netta Engelhardt and Andy Strominger. I’m guessing this will mostly be about the swampland, not string theory.Ī tradition at these conferences is one or more public talks designed to publicize string theory. One of three parallel discussion sessions is entitled “Strings and the Real World” and will be chaired by Cumrun Vafa. Looking at the program, only two out of 44 talks seem to be significantly about string theory. Taking a look at the program, one thing that stands out is that the string theory community has almost completely stopped doing string theory. This year’s version will be held next week in Vienna, for more information see here. I’ve often written about these conferences on the blog, see here. Also see another old posting, here.Įach summer for nearly a quarter-century there has been a big yearly conference bringing together the string theory community. Update: Will Kinney reminds me that he wrote a paper about this, see here, as well as here and here for more about the story of that paper. I’ve come to the conclusion that best to not waste more time on this. Few physicists though seem to care that bogus claims and pseudo-science about the multiverse have overrun their field and become its public face. I don’t see anything like that in a quick look at the papers.įor many years I’ve spent a significant amount of time reading books and papers purporting to offer scientific evidence for a multiverse, trying to carefully understand the author’s arguments and write about them here (one example involved earlier claims by this author, see here). Presumably this is a reference to these three papers, but who knows.
I spent a few minutes today looking through the book in the bookstore, trying to figure out where to find the details of the “spectacularly vindicated with observational evidence.” I didn’t see any references in the book, just a claim that in 2018 the author collaborated with Eleonora Di Valentino on showing vindication by observation. In recent years, Laura Mersini-Houghton’s ground-breaking theory, spectacularly vindicated with observational evidence, has turned the multiverse from philosophical speculation to one of the most compelling and credible explanations of our universe’s origins. One of the world’s most celebrated cosmologists presents her breakthrough explanation of our origins in the multiverse. There’s a new book out this month, Before the Big Bang: The Origin of the Universe from the Multiverse, about which we’re told:
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