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Recent posts
134. Cosmic strings – simple and nice introduction into the topic
After my recent post on textures I have been asked what could a newcomer to the field read about topological defects in cosmology apart from the canonical book by Vilenkin and Shellard that I’ve recommended? Occasionally, a very good introduction level review of cosmic strings has recently appeared in Archives – the paper by A. [...]
133. Multi-Field Inflation on the Landscape
This is the guest blog post by my friend Thorsten Battefeld from Princeton. Dmitry. Dmitry asked me to write a guest post about a recent paper written by Diana and myself on “Multi-field Inflation on the Landscape” (a followup to “Staggered Multi-Field Inflation”) where we ask a simple question: assuming that inflaton is driven by [...]
132. Fun with Amazon.com
As you know very well, Amazon.com is an incredible source of extremely valuable assets which can become yours with just one click (well… several clicks… and giving them your credit card number… and more clicks… but, anyway, let me be positive ). For example, till this very day I had no idea that it is [...]
131. Non-gaussianities from postinflationary universe
Mark Trodden and Alessandra Silvestri have recently released a paper about signatures of non-gaussianity from the post-inflationary early Universe. The title of the paper is speaking for itself: one can immediately recall that CMB fluctuations can be generated from cosmic strings and other topological defects, i.e., they may be partially sourced by various phase transitions [...]
130. A question in general relativity and another poll
I have been asked the following question by one of my friends: “I know that the frame of reference determines that it is the stay-at-home twin who ages faster than the twin travelling at some fraction of light speed. Some years back, an experiment in which one of a pair of synchronized atomic clocks was [...]
129. Metamodern – the trajectory of technology
Hi friends Just wanted to let you know that Eric Drexler, considered by many as a founding father of nanotechnology, the man of great vision enormously respected by your humble correspondent , the author of “Nanosystems” and “Engines of creation“, has just made his own blog “Metamodern” open for public. It turns out that he [...]
128. Melancholy
Jim Kotsybar has just sent me his another poem, which I liked very much (as usual) and would want to share it with you. And yes, very often such a poem would reflect perfectly the mood of a physicist… RARIFIED by James Ph. Kotsybar The physicist had reached the end of equations he’d worked for [...]
127. Ashtekar at Perimeter Institute
Abhay Ashtekar has recently visited the Perimeter Institute and gave a couple of talks – about loop quantum gravity of course, since he is one of the major players in the LQG field (considered to be its inventor). I think, both of the talks are worth watching (or at least scanning through his transparencies available [...]
126. From quarks to strings. Migdal-Makeenko equation and AdS-CFT correspondence
Although Lubos wants to see my answer to the poll , I decided to finish my analysis of the recent Polyakov’s paper today. Page 6. In order to justify my picture I have used intuition coming from the loop equation, while Klebanov and Maldacena appealed to the D brane picture of the gauge fielauds. Both [...]
125. From quarks to strings. On Liouville mode, instantons and confinement in abelian theories
Alexander Polyakov have released this week a preprint about history of string theory, which is also so full of non-trivial physical ideas that I decided to list some of them in this post as well as to include my comments (or rather my ramblings ) So, here we go. On Page 2. It took some [...]
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Large non-Gaussianity from axion inflation
January 31, 2012 14:01 -
On strong disorder renormalization
March 18, 2011 20:03 -
Relaunching NEQNET
January 20, 2011 21:01 -
Saturday’s photoguess: what does this monkey symbolize?
June 20, 2009 19:06 -
Dynamics of space storm
June 19, 2009 12:06
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Micro: Can 2 question provide a common solution? Black holes, information loss paradox and Ultra high energy cosmic rays. ...
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James Ph. Kotsybar: SAGITTARIUS A* -- James Ph. Kotsybar Mysteriously cloaked, obscure despite Interior illuminating glare, Long ...
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cad: The presentation can be found in several formats at http://pirsa.org/08110051/...
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Leo: Ok I have a question: if a black hole is supermassive, say 100 billion solar mass, let's suppose Alice fells int...
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superkuh: I am glad you are back! No more disapointing weekly refreshings of that monkey....
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Ariel Amir: Very interesting, thanks. It indeed seems to be very close to what we discuss here. I wonder whether the distributi...
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