Fakultät für Mathematik und Physik

 

Recent Submissions

  • Gheorghiu, Tamara; Vacaru, Olivia; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    We find general parameterizations for generic off-diagonal spacetime metrics and matter sources in general relativity (GR) and two measure/bi-metric modified gravity theories, MGTs, when the field equations decouple with ...
  • Rajpoot, Subhash; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    Let g be a pseudo-Riemanian metric on a manifold V with conventional n+n dimensional splitting, n ≥ 2, for a nonholonomic (non-integrable) distribution N and consider a correspondingly adapted linear metric compatible ...
  • Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    We outline a geometric method of constructing generic off-diagonal and diagonal cosmological solutions of effective Einstein equations modeling modified gravity theories with two non-Riemannian volume forms and associated ...
  • Alexiou, Maria; Gheorghiu, Tamara; Stavrinos, Panayiotis C.; Vacaru, Olivia; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    We review the theory of geometric flows on nonholonomic manifolds and tangent bundles and self-similar configurations resulting in generalized Ricci solitons and Einstein-Finsler equations. There are provided new classes ...
  • Rajpoot, Subhash; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    A brief summary of the anholonomic frame deformation method, AFDM, for generating exact solutions with generic off-diagonal metrics and generalized nonlinear connections in modified gravity theories, MGTs, is presented. ...
  • Wick, Thomas (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2020-01-29)
    These lecture notes are devoted to the numerical solution of partial differential equations (PDEs). PDEs arise in many fields and are extremely important in modeling of technical processes with applications in physics, ...
  • Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1975)
    Off-shell changes are generated in the 1S0 nucleon-nucleon interaction using the Reid soft-core potential and unitary transformations of short range. Charge symmetry is assumed for the nuclear force. The same off-shell ...
  • Sauer, Peter Ulrich; Sevgen, A. (College Park, MD : American Physical Society, 1976)
    A technique for constructing the nucleon-nucleon transition matrices T in the presence of inelastic channels is given. The present technique avoids the usual potential fit and continues T off the energy shell directly ...
  • Garcilazo, H.; Mizutani, T.; Pea, M.T.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1990)
    The question of whether one can consistently define and extract nucleon-delta scattering parameters, phase shifts, and inelasticities from the partial-wave NN→NΔ amplitudes is discussed. We have studied the unitarity ...
  • Hajduk, Ch.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1980)
    A Galilean-noninvariant correction to ordinary one-boson-exchange potentials is derived. It gives rise to a three-body force in the three-nucleon system. Its importance for the properties of the three-nucleon bound state ...
  • Brandenburg, R.A.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1975)
    We investigate the effects which the experimental uncertainty of the neutron charge form factor can have on the charge form factors of 3H and 3He. NUCLEAR REACTIONS Elastic electron scattering, charge form factors, ...
  • Yuan, L.P.; Chmielewski, K.; Oelsner, M.; Sauer, Peter Ulrich; Adam, J. (College Park, MD : American Physical Society, 2002)
    Electrodisintegration of the three-nucleon bound state with two-body final states is described. The description uses nucleon degrees of freedom extended to include the excitation of a single nucleon to a Δ isobar. The ...
  • Sales, J.H.O.; Frederico, T.; Carlson, B.V.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 2000)
    A three-dimensional reduction of the two-particle Bethe-Salpeter equation is proposed. The proposed reduction is in the framework of light-front dynamics. It yields auxiliary quantities for the transition matrix and the ...
  • Schulze, R.-W.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1997)
    Inelastic electron scattering from 3He is studied in the kinematic region of pion production. Inclusive processes with polarization of the electron probe and of the 3He target are described in the plane wave impulse ...
  • Nemoto, S.; Chmielewski, K.; Oryu, S.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1998)
    Δ-isobar excitation in the nuclear medium yields an effective three-nucleon force. A coupled-channel formulation of nucleon-deuteron scattering with Δ-isobar excitation developed previously is used. The three-particle ...
  • Sales, J.H.O.; Frederico, T.; Carlson, B.V.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 2001)
    The reduction of the two-fermion Bethe-Salpeter equation in the framework of light-front dynamics is studied for the Yukawa model. It yields auxiliary three-dimensional quantities for the transition matrix and the bound ...
  • Schulze, R.-W.; Sauer, Peter Ulrich (College Park, MD : American Physical Society, 1997)
    A relativistic description of polarized deep-inelastic lepton scattering from polarized nuclei is presented. It is based on front form dynamics. Convolution formulas for the nuclear spin structure functions gA1 and gA2 are ...
  • Schulze, R.-W.; Sauer, P.U. (College Park, MD : American Physical Society, 1993)
    Spin-dependent inelastic electron scattering from polarized 3He is studied. The theoretical description uses the plane-wave impulse approximation. A spin-dependent spectral function, which summarizes all of the nuclear ...
  • Peña, M.T.; Garcilazo, H.; Oelfke, U.; Sauer, P.U. (College Park, MD : American Physical Society, 1992)
    Effects on the hadronic and electromagnetic properties of the two-nucleon system above pion threshold, arising from the interaction of the Δ isobar with nucleons, are investigated. The instantaneous nucleon-Δ potential is ...
  • Peña, M.T.; Sauer, P.U.; Stadler, A.; Kortemeyer, G. (College Park, MD : American Physical Society, 1993)
    The description of the three-nucleon system in terms of nucleon and Δ degrees of freedom is extended to allow for explicit pion production (absorption) from single dynamic Δ deexcitation (excitation) processes. This mechanism ...

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