6 research outputs found

    Vacuum structure and effective potential at finite temperature: a variational approach

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    We compute the effective potential for Ď•4\phi^4 theory with a squeezed coherent state type of construct for the ground state. The method essentially consists in optimising the basis at zero and finite temperatures. The gap equation becomes identical to resumming the infinite series of daisy and super daisy graphs while the effective potential includes multiloop effects and agrees with that obtained through composite operator formalism at finite temperature.Comment: 15 pages, Revtex, No figures, to appear in Jou. of Phys.G(Nucl. and Part. Phys.

    Charged Particles in a 2+1 Curved Background

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    The coupling to a 2+1 background geometry of a quantized charged test particle in a strong magnetic field is analyzed. Canonical operators adapting to the fast and slow freedoms produce a natural expansion in the inverse square root of the magnetic field strength. The fast freedom is solved to the second order. At any given time, space is parameterized by a couple of conjugate operators and effectively behaves as the `phase space' of the slow freedom. The slow Hamiltonian depends on the magnetic field norm, its covariant derivatives, the scalar curvature and presents a peculiar coupling with the spin-connection.Comment: 22 page

    Das adrenocorticotrope Hormon (ACTH), die HormonederNebenniere(Cortison,Adrenalin) das Insulin, sowie die Hormone der SchilddrĂĽse und NebenschilddrĂĽse

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    Urticaria, Strophulus, Prurigo, Pruritus

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    Lichen ruber und Pityriasis rubra pilaris

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