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Recent posts
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.
On Harvard – again
By the way, why Harvard is called Harvard? Who is it named for? I guess, everybody knows that, but for me – it was a discovery of the day. It was named for English clergyman John Harvard. Mr. Harvard together with his wife has moved from London to America in 1673. He became a clergyman [...]
Saturday’s photoguess: what are they doing?
and where are they located? (take a careful look at the lower part of the photo.) The full answer is: they took a tour at the Sultan Hassan Mosque in Cairo, Egypt. The date was June 4, 2009. The mosque is one of the largest in the world (it was built in 1256). Via uzhas_sovka.
JHEP is to be published by Springer
Just received an interesting email: Dear Colleague, we would like to inform you that as of 1st January 2010, JHEP will be published by Springer. This agreement is based on the following key principles: * The scientific community will remain in full control of all the scientific and editorial aspects of the Journal. * As [...]
Biocentrism: book review
I was asked to review the book by Dr. Robert Lanza called “Biocentrism: how life and consciousness are the keys to understand true nature of the Universe“. If you are a scientist good enough in your area of expertise, at some point you start wondering whether you can explain everything around you, every single event, [...]
Harvard near bankruptcy
Just wanted to finally end my day and go to sleep (way too much work today), but heard some news and cannot help sharing it with you. According to Boston Magazine Harvard University is to face some very serious problems. The University currently spends about 1.5 billion USD/year, it has lost several billion during crisis [...]
Michio Kaku on artificial intelligence
Nowadays, it is fashionable to hypothesize that an advanced AI, when it appears, will wipe pathetic humans out of the face of the Earth (risk of unfriendly AI, as transhumanists like to call it). I think, what’s not taken into account in these considerations is that humans will evolve as well, will be willing to [...]
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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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