45 citations · 180 across the 9 of their papers we have counts for
9 papers
Blowups in tame monomial ideals
E. Faber, D. B. Westra
We study blowups of affine n-space with center an arbitrary monomial ideal and call monomial ideals that render smooth blowups tame ideals. We give a combinatorial criterion to dec…
Classical and Quantum Mechanics via Lie algebras
Arnold Neumaier, Dennis Westra
The goal of this book is to present classical mechanics, quantum mechanics, and statistical mechanics in an almost completely algebraic setting, thereby introducing mathematicians,…
Scaling Cosmologies of N=8 Gauged Supergravity
Jan Rosseel, Thomas Van Riet, Dennis B. Westra
We construct exact cosmological scaling solutions in N=8 gauged supergravity. We restrict to solutions for which the scalar fields trace out geodesic curves on the scalar manifold.…
Gauging CSO groups in N=4 Supergravity
Mees de Roo, Dennis B. Westra, Sudhakar Panda
We investigate a class of CSO-gaugings of N=4 supergravity coupled to six vector multiplets. Using the CSO-gaugings we do not find a vacuum that is stable against all scalar pertur…
Dynamics of Generalized Assisted Inflation
Jelle Hartong, André Ploegh, Thomas Van Riet +1
We study the dynamics of multiple scalar fields and a barotropic fluid in an FLRW-universe. The scalar potential is a sum of exponentials. All critical points are constructed and t…
Coset Symmetries in Dimensionally Reduced Heterotic Supergravity
D. B. Westra, W. Chemissany
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…