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Recent posts
284. Kerr/CFT: A paradigm to understand the entropy of real black holes?
This is a guest blog post by Geoffrey Compere from the UCSB. Recently, a correspondence has been proposed between extremal black holes and a chiral two-dimensional CFT. This correspondence might be of interest for real astrophysical black holes. For example, the massive black hole in the Milky Way whose nickname is GRS 1915+105 has a [...]
283. Quantum kink and its excitations
This is a guest post by Arttu Rajantie from Imperial College. Dmitry. Dmitry has kindly asked me to write about my recent paper Quantum kink and its excitations, which I wrote with my PhD student David Weir. In it we show how one can obtained detailed information about kinks and other solitons in quantum field [...]
282. Communication among communities
This is a guest blog post by Massimo Ostilli from the Center of Statistical Mechanics and Complexity (INFM, Roma). Dmitry. In recent times, in the network science, the problem of detecting the community structure of a given network (a random graph), has attracted more attention. The general idea behind the concept of community structure comes [...]
281. Twitter updates for 2009-02-21
Importance of stupidity in scientific #research: http://jcs.biologists.org/cgi/…..21/11/1771 I feel stupid all the time… … but writing a paper about it seems bizarre idea Terence Tao on Hardy uncertainty principle: http://tinyurl.com/adbzjl Human eye could detect #entanglement at a distance: http://arxivblog.com/?p=1230 Unbelievable crap #Astronomy science fiction: http://tinyurl.com/cgajjx Pay-per-research: http://tinyurl.com/dlvyqx Evidence for the black hole event horizon: http://tinyurl.com/blxda5 [...]
280. An effect – could you explain the origin?
While watching “Iron man”, I’ve got interested by the following episode: while Mr. Stark flies to Afghanistan to destroy Al Qaeda hideouts, he apparently develops supersonic speed at some point – at list, I’ve clearly heard a shock wave. At the very moment the shock wave comes, a cone of mist is developed around him. [...]
279. Sommerfeld enhancement
This is a brief guest blog post by Roberto Iengo from SISSA (Trieste) who is going to explain us what is Sommerfeld enhancement. Dmitry. Consider two particles which collide and then undergo some reaction as the result of the collision. An interesting case is the annihilation of two dark matter particles, resulting in the emission [...]
278. Twitter updates for 2009-02-20
Chad Orzel on #gravity probe B: http://tinyurl.com/b6cazj Ballistic acceleration of supercurrent in #superconductor: http://link.aps.org/doi/10.110…..102.077001 Kinks in electronic specific heat: http://link.aps.org/doi/10.110…..102.076402 #Gauge coupling unification in F-theory #GUTs: http://link.aps.org/doi/10.110…..102.071601 http://tinyurl.com/df9a9k – how applied #science will look like in 2020. That’s it: Obama signed the #stimulus bill: http://tinyurl.com/bfme2c With all those stimulus money, we better be doing _really_ [...]
277. Video of the day: In search of giants
A nice video about history of particle physics (featuring Brian Cox).
276. Lattice Chirality and (non)Decoupling of the Mirror Fermions
Following my previous post on a brief overview of the current situation of lattice chiral gauge theories and the Ginsparg-Wilson formalism, I would like to say just a few words about what J. Giedt, E. Poppitz and I did in the recent series of papers. The idea of decoupling of the mirror fermions Our idea [...]
275. Twitter updates for 2009-02-19
UFO? http://tinyurl.com/dfa4ld Helping underprepared students in introductory physics: http://jijr.com/ypb Sean Carroll discusses search for #Higgs boson: http://tinyurl.com/b6oqre So, it is practically certain that #Higgs with mass around 165 GeV will be found at Fermilab before 2011 #Gene duplication and evolution: http://tinyurl.com/d7vf9y Lubos Motl on weak #gravity conjecture: http://tinyurl.com/cd8263 The puzzle of planet formation: http://arxivblog.com/?p=1224 – [...]
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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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