152 citations · 1.7k across the 44 of their papers we have counts for
39 papers · 1 filter
Non-Supersymmetric Vacua and Self-Adjoint Extensions
J. Mourad, A. Sagnotti
Internal intervals spanned by finite ranges of a conformal coordinate and terminating at a pair of singularities are a common feature of many string compactifications with brok…
A 4D IIB Flux Vacuum and Supersymmetry Breaking. I. Fermionic Spectrum
J. Mourad, A. Sagnotti
We consider the type-IIB supergravity vacua that include an internal , depend on a single coordinate and respect a four-dimensional Poincaré symmetry, with the aim of high…
On Warped String Vacuum Profiles and Cosmologies, II. Non-Supersymmetric Strings
J. Mourad, A. Sagnotti
We investigate the effects of the leading tadpole potentials of 10D tachyon-free non-supersymmetric strings in warped products of flat geometries of the type M(p+1) x R x T(10-p-2)…
On Warped String Vacuum Profiles and Cosmologies, I. Supersymmetric Strngs
J. Mourad, A. Sagnotti
We investigate in detail solutions of supergravity that involve warped products of flat geometries of the type M(p+1) x R x T(D-p-2) depending on a single coordinate. In the absenc…
String (In)Stability Issues with Broken Supersymmetry
J. Mourad, A. Sagnotti
We review the main results of our investigations motivated by the tadpole potentials of ten-dimensional strings with broken supersymmetry. While these are at best partial indicatio…
On Boundaries, Charges and Fermi Fields
J. Mourad, A. Sagnotti
We address some general issues related to torsion and Noether currents for Fermi fields in the presence of boundaries, with emphasis on the conditions that guarantee charge conserv…
On Classical Stability with Broken Supersymmetry
I. Basile, J. Mourad, A. Sagnotti
We study the perturbative stability of four settings that arise in String Theory, when dilaton potentials accompany the breaking of Supersymmetry, in the USp(32) and U(32) orientif…
An Update on Brane Supersymmetry Breaking
J. Mourad, A. Sagnotti
"Brane supersymmetry breaking" is a peculiar phenomenon that can occur in perturbative orientifold vacua. It results from the simultaneous presence, in the vacuum, of non-mutually…
Continuous-spin field propagator and interaction with matter
Xavier Bekaert, Jihad Mourad, Mojtaba Najafizadeh
Action principles for the single and double valued continuous-spin representations of the Poincare group have been recently proposed in a Segal-like formulation. We address three r…
Vacua from Dilaton Tadpoles and Form Fluxes
J. Mourad, A. Sagnotti
We describe how unbounded three--form fluxes can lead to families of vacua, with constant dilaton profiles, in the model with "brane supersymmetry brea…
Translation invariant time-dependent massive gravity: Hamiltonian analysis
Jihad Mourad, Karim Noui, Danièle A. Steer
The canonical structure of the massive gravity in the first order moving frame formalism is studied. We work in the simplified context of translation invariant fields, with mass te…
Translation invariant time-dependent solutions to massive gravity II
J. Mourad, D. A. Steer
This paper is a sequel to arXiv:1310.6560 [hep-th] and is also devoted to translation-invariant solutions of ghost-free massive gravity in its moving frame formulation. Here we con…
Covariant constraints in ghost free massive gravity
C. Deffayet, J. Mourad, G. Zahariade
We show that the reformulation of the de Rham-Gabadadze-Tolley massive gravity theory using vielbeins leads to a very simple and covariant way to count constraints, and hence degre…
Comments on higher-spin holography
Xavier Bekaert, Euihun Joung, Jihad Mourad
The conjectured holographic duality between vector models with quartic interaction and higher-spin field theory in the bulk is reviewed, with emphasis on some versions and generali…
Boundary action of free AdS higher-spin gauge fields and the holographic correspondence
Euihun Joung, Jihad Mourad
We determine the boundary terms of the free higher-spin action which reproduce the AdS Fronsdal equations in an AdS manifold with a finite distance boundary. The boundary terms are…
Effective action in a higher-spin background
Xavier Bekaert, Euihun Joung, Jihad Mourad
We consider a free massless scalar field coupled to an infinite tower of background higher-spin gauge fields via minimal coupling to the traceless conserved currents. The set of Ab…
Unconstrained Higher Spins of Mixed Symmetry. II. Fermi Fields
Andrea Campoleoni, Dario Francia, Jihad Mourad +1
This paper is a sequel of arXiv:0810.4350 [hep-th], and is also devoted to the local "metric-like" unconstrained Lagrangians and field equations for higher-spin fields of mixed sym…
On higher spin interactions with matter
Xavier Bekaert, Euihun Joung, Jihad Mourad
Cubic couplings between a complex scalar field and a tower of symmetric tensor gauge fields of all ranks are investigated. A symmetric conserved current, bilinear in the scalar fie…
Unconstrained Higher Spins of Mixed Symmetry. I. Bose Fields
Andrea Campoleoni, Dario Francia, Jihad Mourad +1
This is the first of two papers devoted to the local "metric-like" unconstrained Lagrangians and field equations for higher-spin gauge fields of mixed symmetry in flat space. Here…
Three Dimensional Quantum Geometry and Deformed Poincare Symmetry
E. Joung, J. Mourad, K. Noui
We study a three dimensional non-commutative space emerging in the context of three dimensional Euclidean quantum gravity. Our starting point is the assumption that the isometry gr…
(A)dS exchanges and partially-massless higher spins
D. Francia, J. Mourad, A. Sagnotti
We determine the current exchange amplitudes for free totally symmetric tensor fields $\vf_{μ_1 ... μ_s}$ of mass in a -dimensional space, extending the results previou…
Group theoretical approach to quantum fields in de Sitter space I. The principal series
E. Joung, J. Mourad, R. Parentani
Using unitary irreducible representations of the de Sitter group, we construct the Fock space of a massive free scalar field. In this approach, the vacuum is the unique dS invarian…
Continuous spin particles from a string theory
J. Mourad
It has been shown that the massless irreducible representations of the Poincaré group with continuous spin can be obtained from a classical point particle action which admits a gen…
Continuous spin and tensionless strings
J. Mourad
A classical action is proposed which upon quantisation yields massless particles belonging to the continuous spin representation of the Poincaré group. The string generalisation of…