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- Vasiliki Plerou, P. Gopikrishnan, Bernd Rosenow, Luis A. Nunes Amaral, Thomas Guhr, Harry Eugene Stanley
- Physical review. E, Statistical, nonlinear, and…
- 2002

We analyze cross correlations between price fluctuations of different stocks using methods of random matrix theory (RMT). Using two large databases, we calculate cross-correlation matrices C of… (More)

We use methods of random matrix theory to analyze the cross-correlation matrix C of stock price changes of the largest 1000 U.S. companies for the 2-year period 1994–1995. We find that the statistics… (More)

It is common knowledge that any two rms in the economy are correlated. Even rms belonging to di erent sectors of an industry may be correlated because of “indirect” correlations. How can we analyze… (More)

- P. Gopikrishnan, Bernd Rosenow, Vasiliki Plerou, Harry Eugene Stanley
- Physical review. E, Statistical, nonlinear, and…
- 2001

Firms having similar business activities are correlated. We analyze two different cross-correlation matrices C constructed from (i) 30-min price fluctuations of 1000 US stocks for the two-year period… (More)

- Michael J. Levin, Bertrand I Halperin, Bernd Rosenow
- Physical review letters
- 2007

We show that the particle-hole conjugate of the Pfaffian state-or "anti-Pfaffian" state-is in a different universality class from the Pfaffian state, with different topological order. The two states… (More)

- Bernd Rosenow, Bertrand I Halperin
- Physical review letters
- 2007

In quantum Hall systems with two narrow constrictions, tunneling between opposite edges can give rise to quantum interference and Aharonov-Bohm-like oscillations of the conductance. When there is an… (More)

We discuss the effects of quenched disorder on a model of charge density wave (CDW) ordering on the square lattice. Our model may be applicable to the cuprate superconductors, where a random… (More)

In recent years, physicists have started applying concepts and methods of statistical physics to study economic problems. The word “Econophysics” is sometimes used to refer to this work. Much recent… (More)

Diversification of an investment into independently fluctuating assets reduces its risk. In reality, movement of assets are are mutually correlated and therefore knowledge of cross–correlations among… (More)

- Friedrich W. Hehl, Yuri N. Obukhov, Bernd Rosenow
- Physical review letters
- 2004

Most of the experiments on the quantum Hall effect (QHE) were made at approximately the same height above sea level. A future international comparison will determine whether the gravitational field… (More)