Geometric approach to asymptotic expansion of Feynman integrals     Geometric  asymptotic expansion  Feynman integrals       font style='font-size:12px;'> 2010/12/27

We present an algorithm that reveals relevant contributions in non-threshold-type asymptotic expansion of Feynman integrals about a small parameter. It is shown that the problem reduces to finding a c...

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On the high-density expansion for Euclidean Random Matrices     the high-density expansion  Euclidean Random Matrices       font style='font-size:12px;'> 2010/12/27

Diagrammatic techniques to compute perturbatively the spectral properties of Euclidean Random Matrices in the high-density regime are introduced and discussed in detail. Such techniques are developed ...

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The 1/N expansion of colored tensor models     The 1/N expansion  colored tensor models       font style='font-size:12px;'> 2010/12/27

In this paper we perform the 1/N expansion of the colored three dimensional Boulatov tensor model. As in matrix models, we obtain a systematic topological expansion, with more and more complicated to...

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High--order connected moments expansion for the Rabi Hamiltonian     High-order connected moments expansion  Rabi Hamiltonian       font style='font-size:12px;'> 2010/11/9

We analyze the convergence properties of the connected moments expansion (CMX) for the Rabi Hamiltonian. To this end we calculate the moments and connected moments of the Hamiltonian operator to a suf...

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Green's Function expansion of scalar and vector fields in the presence of a medium     Green's Function expansion  scalar and vector fields  presence of a medium       font style='font-size:12px;'> 2010/11/5

Based on a canonical approach and functional-integration techniques, a series expansion of Green's function of a scalar field, in the presence of a medium, is obtained. A series expansion for Lifshitz...

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