R. Hilfer1,2, B. Biswal1,3, H.G. Mattutis4, W. Janke5
1ICA-1, Universität Stuttgart, Pfaffenwaldring 27, 70569 Stuttgart, Germany
2Institut für Physik, Universität Mainz, 55099 Mainz, Germany,
3Department of Physics, Sri Venkateswara College, University of Delhi, New Delhi - 110 021, India
4Tokyo University of Electro-communications, Dept. of Mechanical and Control Engineering,
Chofu, Tokyo 182-8585, Japan
5Institut für Theoretische Physik, Universität Leipzig,
Augustusplatz 10/11, D-04109 Leipzig, Germany
Abstract.
The tails of the critical order-parameter distribution of the
two-dimensional Ising model are investigated through extensive
multicanonical Monte Carlo simulation. Results for fixed boundary
conditions are reported here, and compared with known results for
periodic boundary conditions. Clear numerical evidence for “fat”
stretched exponential tails exists below the critical temperature,
indicating the possible presence of fat tails at the critical
temperature. Our work suggests that the true order parameter
distribution at the critical temperature must be considered to be
unknown at present.
