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Dark energy models which alter the relative scaling behavior of dark energy and matter could provide a natural solution to the cosmic coincidence problem-why the densities of dark energy and dark matter are comparable today. A generalized class of dark energy models is introduced which allows noncanonical scaling of the ratio of dark matter and dark energy… (More)

- A H Hoang, A V Manohar, I W Stewart, T Teubner
- 2001

The total cross section for top quark pair production close to threshold in e + e − annihilation is investigated. Details are given about the calculation at next-to-next-to-leading logarithmic order. The summation of logarithms leads to a convergent expansion for the normalization of the cross section, and small residual dependence on the subtraction… (More)

- C Caso, G Conforto, A Gurtu, M Aguilar-Benitez, C Amsler, R M Barnett +45 others
- 1998

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