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Archive for June, 2009
Lithium problem
Apart from being a very nice review of Big Bang Nucleosynthesis (BBN), recent paper by Karsten Jedamzik and Maxim Pospelov discusses an important open problem in the physics of BBN. In short, the lithium problem in physics of Big Bang Nucleosynthesis is seeming underproduction of . What do we mean by that? Well, the lithium [...]
Rocky Kolb’s lecture on Dark Universe
… namely, about dark matter and dark energy as you may imagine. The lecture itself (2009 Buhl lecture at Carnegie Mellon U) is actually very clear and suitable for newcomers/non-scientists. So, if you want to know in some details (more or less technical) what the modern cosmology is all about, please check out this lecture.
Other interesting things in ArXiv (11 Jun 2009)
Basically, there were so many interesting and useful papers (or at least they were useful for me) – lecture notes, reviews – that it will give me hard time posting reviews of all of them here – since I am lazy, I’ll just try to list some of them. Umut Gursoy et al. “Thermal Transport [...]
Notes on strongly coupled QCD in the continuum
By continuum here we mean using methods different from lattice QCD, which is currently our main instrument for quantitative understanding of QCD physics at strong coupling. What can we actually do apart from lattice simulations to study properties of QCD in this regime? Not much really. As recent minireview paper by M. Pennington explains, one [...]
Carnegie Mellon’s contribution to Star Trek universe
… apart from training Spock, I mean – the head of the Computer Science Department at Carnegie Mellon U. discusses several interesting projects being developed at the University which are worth putting into the universe of Star Trek.
Tour of Ares IX
Jim Halsell (former astronaut) takes Miles O’Brien on a tour through the various components of the new NASA Ares IX rocket.
Into dark ages or again about GRB090423
Back in April, I already wrote about GRB090423 – currently the most distant detected object in the Universe. Yesterday, two papers with details of mesurement have appeared in astro-ph (unfortunately, Icannot give you the links – see my comment below). Let me remind you that currently the redshift of the most distant galaxy we observed [...]
How to spot a black hole on the Sky
Here is a video from NewScientist featuring simulations by Loeb and his collaborators (we have discussed Loeb’s results several times on NEQNET). The idea is that BH acts as a strong gravitational lense, so if we have a close system “star-BH”, we will see a very specific pattern of light when the companion star crosses [...]
This and that in ArXiv on Monday
Due to unbelievable overload of the last days let me simply list the recent papers in ArXiv that I found the most interesting: 1. Quantum information T. Tilma el al., “Is entanglement a critical resource for quantum metrology?” Can we beat the shot-noise limit (and get to the Heisenberg limit) in quantum metrology by playing [...]
Three last Susskind’s lectures on general relativity
… that is, lectures 10, 11 and 12: gravity in 4+1 dimensions, dynamics of scalars in curved spacetimes (and behavior of gravitational potential – which is scalar), a bit of topology (Euler characteristics), Lagrangian of a relativistic massive point particle, geodesics in curved spacetime and, finally, Schwarzschild solution.
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On moduli stabilisation in heterotic orbifolds
April 24, 2012 09:04 -
A holographic model of the quantum Hall effect
April 19, 2012 09:04 -
Transdimensional Multiverse Measures
April 18, 2012 11:04 -
Large non-Gaussianity from axion inflation
January 31, 2012 14:01 -
On strong disorder renormalization
March 18, 2011 20:03
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Momchil: I want to ask the experts about an apparent confusion, that appears in many papers on the Unruh effect. As you stat...
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Paul: Excellent list! how lucky you are to be involved in the effort to solve some of these. On time, I question its re...
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philbert: Simple illustration and may apply to mixed layer boundary layers, how about the stable and other types of boundary ...
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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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