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Dmitry Podolsky

374. How big is the Universe: video of the day

Well, if you recall that it takes more than 3 years for a photon emitted by the Sun to reach the nearest star… the size of the causal patch, 14 billion light years, should impress you If words did not really impress you, then maybe this nice video will – Update: Daniel also liked this [...]

ASTRO April 27, 2009 3 Comments
Dmitry Podolsky

373. Some musings about Unruh effect

Good new long work week, science geeks! I’ve just finished reading a recent paper by Ugo Moschella and Richard Schaeffer “Quantum fields on curved space times and a new look at the Unruh effect” and wanted to share some of my thoughts with you… 1. Unruh effect. Gravitation and thermodynamics The subject of the paper [...]

ASTRO, HEP-TH/PH April 27, 2009 3 Comments
Dmitry Podolsky

372. On science (in Russia)

As I believe, in the long run the most painful hit that Russia got in final rounds of Cold War wasn’t a decrease of its military might or loss of political influence. It should be rather clear that those who suffer in war the most are the ones who cannot really defend themselves. The most [...]

Uncategorized April 26, 2009 12 Comments
Dmitry Podolsky

371. Saturday’s photoguess

Kindly take a look at photos below and try to guess what are these nice guys building and where exactly does it happen Hint: Photo 3 has all information you need to guess correctly what it is. Answer: This is the launch pad for Soyuz rocket being built in Korou, French Guyana. Kudos to Gabriel

Uncategorized April 25, 2009 6 Comments
Dmitry Podolsky

370. The future of science blogs

I’ve just finished a reading rather interesting article by Mark Penn on WSJ called “America’s newest profession: bloggers for hire“. Penn presents rather interesting stats there (based on analysis by Technorati): The best studies we can find say we are a nation of over 20 million bloggers, with 1.7 million profiting from the work, and [...]

Uncategorized April 25, 2009 3 Comments
Dmitry Podolsky

369. Stephen Hawking’s “Black holes and beyond”: video of the day

Black holes, wormholes, initial singularity in cosmology… as explained by Stephen Hawking. Rumor says he is in Addenbrooke’s hospital now fighting with chest infection. I wish you quick and full recovery, Prof. Hawking.

ASTRO April 24, 2009 1 Comment
Dmitry Podolsky

368. Inertial confinement: more on interaction of laser emission with matter

Yeah… so, where did we stop last time? I’ve just said another triviality – that laser emission strongly interacts with material of the fuel capsule. There are several mechanisms of this interaction: deflection (ablator and fuel are almost transparent but not quite), absorption and scattering. Wired Science visits LLNL and National Ignition Facility As for [...]

APPLIED, COND-MAT, HEP-TH/PH April 24, 2009 3 Comments
Dmitry Podolsky

367. ATLAS/CERN 2009 multimedia contest: video of the day

Are you a graduate student at physics department who is badly annoyed by the fact that your girlfriend calls you nerd? Do you want to be like Brian Cox instead? (oh God, my answer would be resounding No ) or at least to get an internship at CERN, to take a closer look on LHC [...]

HEP-TH/PH April 23, 2009 1 Comment
Dmitry Podolsky

366. Some interesting recent papers in Arxiv

Just wanted to acknowledge their existence, although I’ll not be really able to review them due to the lack of time… 1. Quantum field theory 1.1. “Non-Abelian Duality and Confinement in N=2 Supersymmetric QCD” by Michail Shifman and Alesha Yung. The authors study transitions from weak to strong coupling in N = 2 SQCD that [...]

ASTRO, COND-MAT, HEP-TH/PH April 23, 2009 0 Comments
Dmitry Podolsky

365. Inertial confinement – using lasers for compression

I hope you are not getting bored too much by my discussion of thermonuclear fusion in inertial confinement reactors, because today I’m going to continue and finally start explaining why do they want to use lasers in HiPER to compress plasma. Basically, the main bonus of using lasers is their ability to concentrate huge energy [...]

APPLIED April 22, 2009 6 Comments
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  • James Ph. Kotsybar: SAGITTARIUS A* -- James Ph. Kotsybar Mysteriously cloaked, obscure despite Interior illuminating glare, Long ...
  • cad: The presentation can be found in several formats at http://pirsa.org/08110051/...
  • James Ph. Kotsybar: COMMENTS FOR THIS ENTRY ARE CLOSED -- James Ph. Kotsybar When the general public hears about A breakthrough in...
  • James Ph. Kotsybar: FEARFUL SYMMETRY (from Songs Of Experiments) -- James Ph. Kotsybar Beyond notice, out of sight in dimensions c...
  • James Ph. Kotsybar: OFF THE SCALE -- James Ph. Kotsybar The young lady known simply as Bright, who could travel at speeds f...
  • James Ph. Kotsybar: COSMIC PREDICTION -- James Ph. Kotsybar Betelgeuse is gonna blow! It?s just a matter of time It?s only ten...
  • Leo: Ok I have a question: if a black hole is supermassive, say 100 billion solar mass, let's suppose Alice fells int...
  • James Ph. Kotsybar: HIGHER DIMENSIONS -- James Ph. Kotsybar From point to line to plane to sphere there?s only three dimensi...
  • superkuh: I am glad you are back! No more disapointing weekly refreshings of that monkey....
  • Dmitry: Thank you James, beautiful and inspiring as usual :)...
  • Dmitry: Yes, renormalization group should still be applicable, but crit. exponents have to be different. By the way, if we ...
  • James Ph. Kotsybar: UNIQUE PARAMETERS -- James Ph. Kotsybar There is only one answer to creation. Though we don?t nearly understan...
  • Ariel Amir: Very interesting, thanks. It indeed seems to be very close to what we discuss here. I wonder whether the distributi...
  • Dmitry: Hi Ariel, thanks for the explanation! Let me now discuss a bit the application I had in mind. It has to do w...
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