12,262 research outputs found
Developments in General Relativity: Black Hole Singularity and Beyond
At the 20-th Texas Symposium on Relativistic Astrophysics there was a plenary
talk devoted to the recent developments in classical Relativity. In that talk
the problems of gravitational collapse, collisions of black holes, and of black
holes as celestial bodies were discussed. But probably the problems of the
internal structure of black holes are a real great challenge. In my talk I want
to outline the recent achievements in our understanding of the nature of the
singularity (and beyond!) inside a realistic rotating black hole. This
presentation also addresses the following questions: Can we see what happens
inside a black hole? Can a falling observer cross the singularity without being
crushed? An answer to these questions is probably "yes".Comment: 13 page
Low-Temperature Decoherence of Qubit Coupled to Background Charges
We have found an exact expression for the decoherence rate of a Josephson
charge qubit coupled to fluctuating background charges. At low temperatures
the decoherence rate is linear in while at high temperatures it
saturates in agreement with a known classical solution which, however, reached
at surprisingly high . In contrast to the classical picture, impurity states
spread in a wide interval of energies () may essentially contribute to
.Comment: Both figures are changed to illustrate a more generic case of
impurity states spread in wide interval of energies. Some changes have been
made to the abstract and the introductio
- …