# Savoirs en partage

Le portail des ressources scientifiques
et pédagogiques de l'AUF

# Ressources

Le portail « Savoirs en partage » favorise la diffusion de documents scientifiques mis en ligne par les établissements membres de l'Agence Universitaire de la Francophonie en collaboration avec les Campus numériques francophones, Direction régionales, etc. : un ensemble d'ouvrages, revues, articles, cours en ligne, etc sont ainsi simplement accessibles. Un moteur de recherche permet de les interroger simultanément
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301721 ressources correspondant à votre recherche (Fil RSS)
Auteur: Choi, Soo-Min, Lee, Hyun Min, Mambrini, Yann, Pierre, Mathias
Résumé: We consider a novel scenario for Vector Strongly Interacting Massive Particle (VSIMP) dark matter with local $SU(2)_X\times U(1)_{Z'}$ symmetry in the dark sector. Similarly to the Standard Model, after the dark symmetry is broken spontaneously by the VEVs of dark Higgs fields, the approximate custodial symmetry determines comparable but split ...
Auteur: Mambrini, Yann, Olive, Keith A., Olive, Keith, Quevillon, Jeremie, Zaldivar, Bryan
Résumé: We study a new mechanism for the production of dark matter in the universe which does not rely on thermal equilibrium. Dark matter is populated from the thermal bath subsequent to inflationary reheating via a massive mediator whose mass is above the reheating scale, T_R. To this end, we consider ...
Auteur: Lebedev, Oleg, Mambrini, Yann
Résumé: We consider the possibility that fermionic dark matter (DM) interacts with the Standard Model fermions through an axial Z' boson. As long as Z' decays predominantly into dark matter, the relevant LHC bounds are rather loose. Direct dark matter detection does not significantly constrain this scenario either, since dark matter ...
Auteur: Lebedev, Oleg, Löwen, Valéri, Mambrini, Yann, Nilles, Hans Peter, Ratz, Michael
Résumé: In the context of flux compactifications, metastable vacua with a small positive cosmological constant are obtained by combining a sector where supersymmetry is broken dynamically with the sector responsible for moduli stabilization, which is known as the F-uplifting. We analyze this procedure in a model-independent way and study phenomenological properties ...
Auteur: Domingo, Florian, Lebedev, Oleg, Mambrini, Yann, Quevillon, Jeremie, Ringwald, Andreas
Résumé: If the hidden sector contains more than one U(1) groups, additional dim-4 couplings (beyond the kinetic mixing) between the massive U(1) fields and the hypercharge generally appear. These are of the form similar to the Chern-Simons interactions. We study the phenomenology of such couplings including constraints from laboratory experiments and ...
Auteur: Arcadi, Giorgio, Mambrini, Yann, Tytgat, Michel H. G., Zaldivar, Bryan, Tytgat, Michel, Zaldıvar, Bryan
Résumé: We consider a simple, yet generic scenario in which a new heavy $Z'$ gauge boson couples both to SM fermions and to dark matter. In this framework we confront the best LHC limits on an extra gauge boson $Z'$ to the constraints on couplings to dark matter from direct detection ...
Auteur: Dudas, Emilian, Heurtier, Lucien, Mambrini, Yann
Résumé: We propose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural values of the couplings ...
Auteur: Falkowski, Adam, Lebedev, Oleg, Mambrini, Yann
Résumé: We study SUSY phenomenology of the KKLT (Kachru-Kallosh-Linde-Trivedi) scenario of string theory compactifications with fluxes. This setup leads to a specific pattern of soft masses and distinct phenomenological properties. In particular, it avoids the cosmological gravitino/moduli problems. Remarkably, the model allows for the correct abundance of SUSY dark matter consistently ...
Auteur: Dudas, Emilian, Heurtier, Lucien, Mambrini, Yann, Zaldivar, Bryan
Résumé: A general analysis is performed on the dimension-six operators mixing an almost hidden Z' to the Standard Model (SM), when the Z' communicates with the SM via heavy mediators. These are fermions charged under both Z' and the SM, while all SM fermions are neutral under Z'. We classify the ...
Auteur: Chu, Xiaoyong, Mambrini, Yann, Quevillon, Jeremie, Zaldivar, Bryan
Résumé: We study the genesis of dark matter in the primordial Universe for representative classes of Z'-portals models. For weak-scale Z' mediators we compute the range of values of the kinetic mixing allowed by WMAP/PLANCK experiments corresponding to a FIMP regime. We show that very small values of the kinetic coupling ...