12 research outputs found
Deformations in Closed String Theory --- Canonical Formulation and Regularization
No full text: We study deformations of closed string theory by primary fields of conformal weight (1; 1), using conformal techniques on the complex plane. A canonical surface integral formalism for computing commutators in a non-holomorphic theory is constructed, and explicit formulae for deformations of operators are given. We identify the unique regularization of the arising divergences that respects conformal invariance, and consider the corresponding parallel transport. The associated connection is metric compatible and carries no curvature. accepted for publication in Nucl.Phys. B. email addresses: [email protected] [email protected] [email protected] Cederwall, von Gussich, Sundell: Deformations in Closed String Theory : : : : : : : : : : : 2 1. Introduction and Summary Probably the most important theoretical problem concerning string theory is the lack of a "covariant" formulation. Despite the fact that closed string theory contains gravity as part of the infinite spectrum, the..
Deformations in closed string theory - canonical formulation and regularization
No full textWe study deformations of closed string theory by primary fields of conformal weight (1,1), using conformal techniques on the complex plane. A canonical surface integral formalism for computing commutators in a non-holomorphic theory is constructed, and explicit formulae for deformations of operators are given. We identify the unique regularization of the arising divergences that respects conformal invariance, and consider the corresponding parallel transport. The associated connection is metric compatible and carries no curvature
Deformations in Closed String Theory — Canonical Formulation and Regularization
No full textAbstract: We study deformations of closed string theory by primary fields of conformal weight (1, 1), using conformal techniques on the complex plane. A canonical surface integral formalism for computing commutators in a non-holomorphic theory is constructed, and explicit formulæ for deformations of operators are given. We identify the unique regularization of the arising divergences that respects conformal invariance, and consider the corresponding parallel transport. The associated connection is metric compatible and carries no curvature
The Dirichlet super three-brane in ten-dimensional type IIB supergravity
No full textWe give the full supersymmetric and kappa-symmetric action for the Dirichlet three-brane, including its coupling to background superfields of ten-dimensional type IIB supergravity
The Dirichlet super p-branes in ten-dimensional type IIA and IIB supergravity
No full textWe give the full supersymmetric and kappa-symmetric actions for the Dirichlet p-branes, including their coupling to background superfields of ten-dimensional type IIA and IIB supergravity
On the Dirac-Born-Infeld action for D-branes
No full textIn this note, we consider the reformulation of the Dirac-Born-Infeld action for a Dirichlet p-brane in Brink-Di Vecchia-Howe-Tucker form, i.e., including an independent non-propagating world-volume metric. When p>2, the action becomes non-polynomial. A closed expression is derived for p=3. For selfdual field-strengths, the DBI action is reproduced by an action with a simple F^2 term. We speculate on supersymmetrization of the D_3-brane action. We also give the governing equations for arbitrary p, and derive an implicit expression for the D_4-brane lagrangian
The Dirichlet super-three-brane in ten-dimensional type IIB supergravity
No full textWe give the full supersymmetric and-symmetric action for the Dirichlet three-brane, including its coupling to background superfields of ten-dimensional type IIB supergravity
Estimates of biomass carbon stocks of the Baltic Sea ecosystem, version 2
No full textWe have estimated the standing stocks in carbon units per m² in the Baltic Sea ecosystem for 18 living and non-living groups relevant to carbon cycle and management activities in the Baltic Sea. We included three non-living apartments: POC, DOC and sediment carbon. The living groups comprise: phytoplankton, protozooplankton, bacteria, zooplankton, macrophythes, benthos, plaice, flounder, herring, sprat, cod, ringed seals, seals, grey seals and harbour porpoises. The estimates are based on ICES raw data and literature data and represent spatial and temporal averages. Data, data sources, assumptions and calculations are described in detail to ensure reproducibility
Feasibility studies for the measurement of time-like proton electromagnetic form factors from at at FAIR
No full textInternational audienceThis paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, and , using the reaction at (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at , using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is , due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented
