Dec
02
Teaser:

Cosmic rays are microscopic, charged particles that permanently bombard Earth from outer space. 100 years after their discovery their origin is still a mystery. It is also not clear how cosmic rays can obtain energies that are sometimes billion times larger than what can be produced in the most powerful particle accelerator on Earth, the LHC, where the Higgs particle was discovered last year. Possible particle accelerators that nature provides are very exotic sites in the universe like exploding stars, massive black holes, gamma-ray bursts, and pulsars. To find out more about these...

Nov
23
Teaser:

To accept Special Relativity we give up Absolute Time. What do we give up to accept Quantum Theory?  After all these years Heisenberg's 1925 discovery paper for Quantum Theory is still opaque, in contrast to  Einstein's for Special Relativity. In hindsight, to accept Quantum Theory we must give up the Classical Principle, which is hardly ever even stated, for the Quantum Principle.  Today this is naturally inferred from a well-known polarization study of Malus in 1805.  Problems  like "spooky...

Nov
18
Teaser:
One of the aims of the annual Astro-GR meetings is to develop and strengthen the links between the astrophysics and relativity communities by highlighting outstanding scientific issues which can only be resolved through collaboration of these groups. In that spirit this workshop will dwell on questions which are intimately related to the formation, growth, and interaction of black holes with their environments, from cosmological scales all the way to the event horizon. - See more at: http://members.aei.mpg.de/amaro-seoane/astro-gr-atlanta/#Rationale

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Nov
15
Teaser:

Sources of single photons (as opposed to sources which produce on average a single photon) are of great current interest for quantum information
processing. Perhaps surprisingly, it is not easy to produce a single photon efficiently and in a controlled way. Following earlier progress, recent experimental activity has resulted in the production of single photons by taking advantage of strong inter-particle interactions in cold atomic gases. I will show how the systematic use of the method of steepest descents can be used to understand the dynamics of the single photon source developed here...

Nov
13
Teaser:

Nov
06
Teaser:

Nov
04
Teaser:

Quantum Simulation with cold atoms is a very ambitious program in AMO research that is being pursued in many laboratories worldwide. The goal is to use cold atoms in optical lattices and in different environment to simulate important yet unsolved theoretical models. In this talk, I shall review the current progress of this effort, its success, and the serious challenges it faces. I shall discuss the possible solutions and the exciting future it holds.

Oct
30
Teaser:

Remoras (echeneid fish) reversibly attach and detach to marine hosts, almost instantaneously, to “hitchhike” and feed. The adhesion mechanisms that they use are remarkably insensitive to substrate topology and quite different from the latching and suction cup-based systems associated with other species at similar length scales.  Remora adhesion is also anisotropic; drag forces induced by the host’s swimming increase adhesive strength, while rapid detachment occurs when the remora reverses this shear load.  In this presentation, an investigation of the adhesive system’s...

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