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234. Continuing dS/CFT. Why it is so hard to prove?
I continue today the discussion of dS/CFT correspondence started a week ago. As you probably remember, I finished last time pointing out the discrepancy between non-perturbative and perturbative values of the dimension of the dS Hilbert space. Namely, since the entropy of dS space is finite, the dimension of of the Hilbert space is finite [...]
233. Video of the day: Susskind’s lectures on special relativity 1 – 4
Fun to watch even for professional physicist – he also effectively teaches quite well how to present the subject. The lectures are quite extended (more than 1 hr 30 min each), so I’ll post one part today and another – tomorrow.
232. Twitter updates for 2009-02-05
Clifford Johnson http://snipr.com/bb3p5 (or more accurately Joe Polchinski) explains what is string theory #strings #stringtheory # Corot-Exo-7b: Venus from the other world – http://www.obspm.fr/actual/nou…..7.en.shtml #planetology Another distant planet! # David Berenstein is doing physics as two level system: http://jijr.com/lml #physics #fun # Lubos Motl continues his rant series on Lorentz symmetry: http://tinyurl.com/c97tfc #lorentz #relativity # [...]
230. Video of the day: viscosity or the arrow of time is reversible
A lot of fun to watch CP is clearly conserved in this experiment LOL LM explanation of the effect: The reason why it looks counterintuitive is the people normally confuse chaotic motion and organized motion. The entropy growth in the system is extremely slow – you can see that the droplets don?t change too quickly [...]
229. Twitter updates for 2009-02-04
David Wands on asymmetric universe: http://dx.doi.org/10.1038/nphys1195 #nature #cosmology # Fluid dynamics: bounce to chaos http://dx.doi.org/10.1038/nphys1187 #nature #hydrodynamics # Long lived quantum memory: http://dx.doi.org/10.1038/nphys1152 #nature #quantum # FIRST robotic challenge 2009: http://is.gd/ih0R #robotic # Quirks – new word in theoretical physics http://resonaances.blogspot.co…..uirks.html Don’t mix it with quarks #fun #quirks # Dark energy and particle physics – [...]
228. Book review: D. Yoshioka. The quantum Hall effect
About a week ago we have briefly discussed the physics of the quantum Hall effect. Let me remind you the conclusions we came to. We discriminate between the integer and fractional quantum Hall effects according to the value of the filling factor . The latter characterizes the many-particle wave function describing behaviour of electrons in [...]
227. Video of the day: Meissner effect in superconductors
Here is the video related to the Problem N8 that we have discussed yesterday (what you see is probably high superconductor – the liquid that the guy uses seems to be liquid nitrogen). The effect seems also to be related to the Problem N4 (confinement of quarks). I mentioned this idea several times on the [...]
226. Top ten open problems in physics
What is the ultimate purpose of my work as theoretical physicist and, if you want, my existence itself? Is it serving the community of other physicists like organizing and participating in conferences? Nop. Then, maybe teaching future physicists in the University, encourage young people to enter the exciting field of physics? Not quite. Writing good [...]
225. Video of the day: Google Earth 5 beta
New Google Earth beta version has been recently released and it is just amazingly cool: it supports historical imagery (that is, you can see how the part of the Earth’s surface you are interested in looked like 50, 100, 10000 years ago), ocean data (that is, you can now study the ocean’s floor with Google [...]
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Large non-Gaussianity from axion inflation
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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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