Papers by Frederik Coomans
Journal of High Energy Physics, 2013
We deform the action and the supersymmetry transformations of the d = 10 and d = 4 Maxwell superm... more We deform the action and the supersymmetry transformations of the d = 10 and d = 4 Maxwell supermultiplets so that at each order of the deformation the theory has 16 Maxwell multiplet deformed supersymmetries as well as 16 Volkov-Akulov type non-linear supersymmetries. The result agrees with the expansion in the string tension of the explicit action of the Dirac-Born-Infeld model and its supersymmetries, extracted from D9 and D3 superbranes, respectively. The half-maximal Dirac-Born-Infeld models with 8 Maxwell supermultiplet deformed supersymmetries and 8 Volkov-Akulov type supersymmetries are described by a new class of d = 6 vector branes related to chiral (2,0) supergravity, which we denote as 'Vp-branes'. We use a space-filling V5 superbrane for the d = 6 model and a V3 superbrane for the d = 4 half-maximal Dirac-Born-Infeld (DBI) models. In this way we present a completion to all orders of the deformation of the Maxwell supermultiplets with maximal 16+16 supersymmetries in d = 10 and 4, and half-maximal 8+8 supersymmetries in d = 6 and 4. e-mails: [email protected],
Journal of High Energy Physics, 2011
We use the superconformal method to construct the full off-shell action of N = (1, 0), D = 6 supe... more We use the superconformal method to construct the full off-shell action of N = (1, 0), D = 6 supergravity, which has apart from the graviton and the gravitino, a 2-form gauge field, a dilaton and a symplectic Majorana spinor. We give detailed formula for superconformal expressions that can be useful for extensions of the theory to more matter multiplets or gauged supergravity. †
We give an example of how conventional gauging methods obstruct a systematic analysis of gauged s... more We give an example of how conventional gauging methods obstruct a systematic analysis of gauged supergravities. We discuss how the embedding tensor formalism deals with these problems and argue that the gauge algebra related to the embedding tensor formalism is soft, open and reducible. We connect the embedding tensor formalism to the field-antifield (or Batalin-Vilkovisky) formalism, which is the most
We use the superconformal method to construct the full off-shell action of N=1,0, D=6 supergravit... more We use the superconformal method to construct the full off-shell action of N=1,0, D=6 supergravity, which has apart from the graviton and the gravitino, a 2-form gauge field, a dilaton and a symplectic Majorana spinor. We give detailed formula for superconformal expressions that can be useful for extensions of the theory to more matter multiplets or gauged supergravity.
We use the superconformal method to construct the full off-shell action of , D = 6 supergravity, ... more We use the superconformal method to construct the full off-shell action of , D = 6 supergravity, which has apart from the graviton and the gravitino, a 2-form gauge field, a dilaton and a symplectic Majorana spinor. We give detailed formula for superconformal expressions that can be useful for extensions of the theory to more matter multiplets or gauged supergravity.
Journal of High Energy Physics, 2012
Journal of High Energy Physics, 2013
ABSTRACT
Journal of High Energy Physics, 2010
We discuss the algebra of general gauge theories that are described by the embedding tensor forma... more We discuss the algebra of general gauge theories that are described by the embedding tensor formalism. We compare the gauge transformations dependent and independent of an invariant action, and argue that the generic transformations lead to an infinitely reducible algebra. We connect the embedding tensor formalism to the field-antifield (or Batalin-Vilkovisky) formalism, which is the most general formulation known for general gauge theories and their quantization. The structure equations of the embedding tensor formalism are included in the master equation of the field-antifield formalism. † e-mails: {Frederik.Coomans, Jan.DeRydt, Antoine.VanProeyen}@fys.kuleuven.be
Fortschritte der Physik, 2011
We give an example of how conventional gauging methods obstruct a systematic analysis of gauged s... more We give an example of how conventional gauging methods obstruct a systematic analysis of gauged supergravities. We discuss how the embedding tensor formalism deals with these problems and argue that the gauge algebra related to the embedding tensor formalism is soft, open and reducible. We connect the embedding tensor formalism to the field-antifield (or Batalin-Vilkovisky) formalism, which is the most general formulation known for gauge theories. † e-mails: {Frederik.Coomans, Jan.DeRydt, Antoine.VanProeyen}@fys.kuleuven.be arXiv:1102.4539v1 [hep-th]
Journal of High Energy Physics, 2012
ABSTRACT Six-dimensional (1,0) supersymmetric gauged Einstein-Maxwell supergravity is extended by... more ABSTRACT Six-dimensional (1,0) supersymmetric gauged Einstein-Maxwell supergravity is extended by the inclusion of a supersymmetric Riemann tensor squared invariant. Both the original model as well as the Riemann tensor squared invariant are formulated off-shell and consequently the total action is off-shell invariant without modification of the supersymmetry transformation rules. In this formulation, superconformal techniques, in which the dilaton Weyl multiplet plays a crucial role, are used. It is found that the gauging of the U(1) R-symmetry in the presence of the higher-order derivative terms does not modify the positive exponential in the dilaton potential. Moreover, the supersymmetric Minkowski(4) x S^2 compactification of the original model, without the higher-order derivatives, is remarkably left intact. It is shown that the model also admits non-supersymmetric vacuum solutions that are direct product spaces involving de Sitter spacetimes and negative curvature internal spaces.
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Papers by Frederik Coomans