Wissam Chemissany
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Wissam Chemissany has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Mees de Roo
University of Groningen
2 shared publications - André Ploegh
Centre for Theoretical Physics University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
1 shared publication - Dennis B. Westra
Centre for Theoretical Physics University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
1 shared publication - Joost de Jong
Centre for Theoretical Physics University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
1 shared publication - Sudhakar Panda
Harish Chandra Research Institute 211019 Allahabad India
1 shared publication - Thomas Van Riet
Centre for Theoretical Physics University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
1 shared publication
Latest Publications
- Open Access
Scaling cosmologies, geodesic motion and pseudo-susy
One-parameter solutions in supergravity carried by scalars and a metric trace out curves on the scalar manifold. In ungauged supergravity these curves describe a geodesic motion. It is known that a geodesic motion sometimes occurs in the presence of a scalar potential and for time-dependent solutions this can happen for scaling cosmologies. This note contains a further study of such solutions in the context of pseudo-supersymmetry for multi-field systems whose first-order equations we derive using a Bogomol'nyi-like method. In particular we show that scaling solutions that are pseudo-BPS must describe geodesic curves. Furthermore, we clarify how to solve the geodesic equations of motion when the scalar manifold is a maximally non-compact coset such as occurs in maximal supergravity. This relies upon a parametrization of the coset in the Borel gauge. We then illustrate this with the cosmological solutions of higher-dimensional gravity compactified on a $n$-torus.
Open AccessScaling cosmologies, geodesic motion and pseudo-susy
One-parameter solutions in supergravity carried by scalars and a metric trace out curves on the scalar manifold. In ungauged supergravity these curves describe a geodesic motion. It is known that a geodesic motion sometimes occurs in the presence of a scalar potential and for time-dependent solutions this can happen for scaling cosmologies. This note contains a further study of such solutions in the context of pseudo-supersymmetry for multi-field systems whose first-order equations we derive using a Bogomol'nyi-like method. In particular we show that scaling solutions that are pseudo-BPS must describe geodesic curves. Furthermore, we clarify how to solve the geodesic equations of motion when the scalar manifold is a maximally non-compact coset such as occurs in maximal supergravity. This relies upon a parametrization of the coset in the Borel gauge. We then illustrate this with the cosmological solutions of higher-dimensional gravity compactified on a $n$-torus.
- Open Access
alpha'-Corrections to Heterotic Superstring Effective Action Revisited
In this letter we establish that the supersymmetric R^2 effective action for the heterotic string, obtained from the supersymmetrisation of the Lorentz Chern-Simons term, is to order $\alpha'$ equivalent modulo field redefinitions to heterotic string effective actions computed by different methods.Open Accessalpha'-Corrections to Heterotic Superstring Effective Action Revisited
In this letter we establish that the supersymmetric R^2 effective action for the heterotic string, obtained from the supersymmetrisation of the Lorentz Chern-Simons term, is to order $\alpha'$ equivalent modulo field redefinitions to heterotic string effective actions computed by different methods. - Open Access
Selfduality of non-linear electrodynamics with derivative corrections
In this paper we investigate how electromagnetic duality survives derivative corrections to classical non-linear electrodynamics. In particular, we establish that electromagnetic selfduality is satisfied to all orders in $\alpha'$ for the four-point function sector of the four dimensional open string effective action.Open AccessSelfduality of non-linear electrodynamics with derivative corrections
In this paper we investigate how electromagnetic duality survives derivative corrections to classical non-linear electrodynamics. In particular, we establish that electromagnetic selfduality is satisfied to all orders in $\alpha'$ for the four-point function sector of the four dimensional open string effective action. - Open Access
Coset Symmetries in Dimensionally Reduced Heterotic Supergravity
We investigate the coset structures which appear in the dimensional reduction of supergravity theories. Especially we investigate how to recognize the global symmetry groups if the coset is non-split. As an example we apply our analysis to the theories emanating from the dimensional reduction of Heterotic supergravity.
Open AccessCoset Symmetries in Dimensionally Reduced Heterotic Supergravity
We investigate the coset structures which appear in the dimensional reduction of supergravity theories. Especially we investigate how to recognize the global symmetry groups if the coset is non-split. As an example we apply our analysis to the theories emanating from the dimensional reduction of Heterotic supergravity.