Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Bossche, B. Van den"'
New finite-dimensional representations of specific polynomial deformations of sl(2,R) are constructed. The corresponding generators can be, in particular, realized through linear differential operators preserving a finite-dimensional subspace of mono
Externí odkaz:
http://arxiv.org/abs/quant-ph/0303062
We propose a general method for constructing quasi-exactly solvable potentials with three analytic eigenstates. These potentials can be real or complex functions but the spectrum is real. A comparison with other methods is also performed.
Externí odkaz:
http://arxiv.org/abs/quant-ph/0209080
We construct new quasi-exactly solvable one-dimensional potentials through Darboux transformations. Three directions are investigated: Reducible and two types of irreducible second-order transformations. The irreducible transformations of the first t
Externí odkaz:
http://arxiv.org/abs/quant-ph/0201105
We construct a general algorithm generating the analytic eigenfunctions as well as eigenvalues of one-dimensional stationary Schroedinger Hamiltonians. Both exact and quasi-exact Hamiltonians enter our formalism but we focus on quasi-exact interactio
Externí odkaz:
http://arxiv.org/abs/quant-ph/0201100
A matricial Darboux operator intertwining two one-dimensional stationary Dirac Hamiltonians is constructed. This operator is such that the potential of the second Dirac Hamiltonian as well as the corresponding eigenfunctions are determined through th
Externí odkaz:
http://arxiv.org/abs/quant-ph/0111163
Autor:
Kleinert, H., Bossche, B. Van den
Publikováno v:
Nucl.Phys.B632:51-68,2002
The effective potential of scalar QED is computed analytically up to two loops in the Landau gauge. The result is given in 4-epsilon dimensions using minimal subtraction and epsilon-expansions. In three dimensions, our calculation is intended to help
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104102
Autor:
Kleinert, H., Bossche, B. Van den
Publikováno v:
Phys. Rev. E 63, 056113 (2001)
We use variational perturbation theory to calculate various universal amplitude ratios above and below T_c in minimally subtracted phi^4-theory with N components in three dimensions. In order to best exhibit the method as a powerful alternative to Bo
Externí odkaz:
http://arxiv.org/abs/cond-mat/0011329
Autor:
Kleinert, H., Bossche, B. Van den
The Van Vleck-Pauli-Morette fluctuation determinant is derived from the global group property of the time evolution amplitude in a continuous formulation of path integrals.
Comment: Author Information under http://www.physik.fu-berlin.de/~kleine
Comment: Author Information under http://www.physik.fu-berlin.de/~kleine
Externí odkaz:
http://arxiv.org/abs/quant-ph/0002008
Autor:
Kleinert, H., Bossche, B. Van den
In contrast to common belief, the chirally symmetric Nambu--Jona-Lasinio model does not contain massless pions, due to strong chiral fluctuations. Although quarks acquire spontaneously a nonzero constituent mass $M$, pions have a nonzero mass equal t
Externí odkaz:
http://arxiv.org/abs/hep-ph/9908284
Autor:
Kleinert, H., Bossche, B. Van den
Publikováno v:
Phys.Lett. B474 (2000) 336-346
We argue that the spontaneous breakdown of symmetry in the chirally symmetric Nambu--Jona-Lasinio model which was supposed to illustrate the origin of the low mass of pions in hadron physics does not occur due to strong fluctuations in the sigma - pi
Externí odkaz:
http://arxiv.org/abs/hep-ph/9907274