String theory is used to compute the microscopic entropy for several examples of black holes in compactifications with N = 2 supersymmetry. Agreement with the Bekenstein-Hawking entropy and the moduli-independent N = 2 area formula is found in all cases.

Abstract For models with several time-dependent components generalized entropies can be defined. This is shown for the Bianchi type IX model. We first derive the Cardy-Verlinde formula under the assumption that the first law of thermodynamics is valid. This leads to an explicit expression of the total entropy associated with this type of universes. Assuming the validity of the Cardy entropy for...

Abstact We quantize the tachyon field in a static two dimensional dilaton gravity black hole background,and we calculate the Hawking radiation rate.We find that the thermal radiation flux,due to the tachyon field, is larger than the conformal matter one.We also find that massive scalar fields which do not couple to the dilaton,do not give any contribution to the thermal radiation, up to terms q...

other to achieve their goal. There are also heroes and heroines and Ashburner identifies these as including Gerry Rubin and Suzi Lewis in particular. Heroes come in all shapes and sizes and, despite what Scott Hawley says in his Epilogue, they most definitely include Michael Ashburner. The heroes of mythology were no less fallible than the rest of us and, characteristically and endearingly, Ash...

We established bird monitoring programs in two regions of Minnesota: the Chippewa National Forest and the Superior National Forest. The experimental design defined forest cover types as strata in which samples of forest stands were randomly selected. Subsamples (3 point counts) were placed in each stand to maximize field effort and to assess within-stand and between-stand variation for a variet...

We will define a problem regarding locating a simple random walk on a graph, and give bounds for the optimal solution on toruses of dimension 2,3. 1 Hunting a Random Walker There are several natural variants of the hunting problem, here is one. A bird performs a random walk on a graph. At each step a hunter picks a vertex and either catches the bird or gets to see if the bird visited there befo...

A derivation of the Hawking effect is given which avoids reference to field modes above some cutoff frequency ωc ≫ M−1 in the freefall frame of the black hole. To avoid reference to arbitrarily high frequencies, it is necessary to impose a boundary condition on the quantum field in a timelike region near the horizon, rather than on a (spacelike) Cauchy surface either outside the horizon or at e...