• Off-diagonal wormhole and black hole deformations and dark energy in two measure/bi-metric modified gravity theories 

  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 ...
• Generic off-diagonal solutions and jet deformations in modified and/or higher dimension gravity theories 

  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 ...
• Locally anisotropic cosmological systems in modified two measure and massive gravity theories 

  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 ...
• Nonholonomic ricci flows and Finsler-Lagrange f(R,F,L)-modified gravity and dark matter effects 

  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 ...
• Geometric methods for constructing cosmological solutions for EYMH systems in two measure, f(R) and massive gravity theories 

  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. ...
• Numerical Methods for Partial Differential Equations 

  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, ...
• Charge symmetry of the nuclear force as off-shell constraint 

  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 ...
• Off-energy-shell continuation of the nucleon-nucleon and meson-nucleon transition matrices in the presence of inelasticities 

  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 ...
• Does it make sense to talk about NΔ phase shifts? 

  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 ...
• Three-body force from kinematical effects in the three-nucleon system 

  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 ...
• Role of the neutron charge form factor in electron scattering from the three-nucleon system 

  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, ...
• Two-body electrodisintegration of the three-nucleon bound state with Δ-isobar excitation 

  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 ...
• Light-front Bethe-Salpeter equation 

  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 ...
• Polarization effects in pion electroproduction from 3He 

  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 ...
• Discrepancy in the cross section minimum of elastic nucleon-deuteron scattering 

  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 ...
• Renormalization of the ladder light-front Bethe-Salpeter equation in the Yukawa model 

  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 ...
• Polarized deep-inelastic lepton scattering from the polarized two- and three-nucleon bound states 

  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 ...
• Inelastic electron scattering from the three-nucleon bound states with polarization 

  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 ...
• Effect of the NΔ interaction on observables of the πNN and γNN systems 

  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 ...
• Three-nucleon force and the Δ mechanism for pion production and pion absorption 

  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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