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[en] This article is written as a review of the Hamiltonian formalism for the bigravity with de Rham-Gabadadze-Tolley (dRGT) potential, and also of applications of this formalism to the derivation of the background cosmological equations. It is demonstrated that the cosmological scenarios are close to the standard ΛCDM model, but they also uncover the dynamical behavior of the cosmological term. This term arises in bigravity regardless on the choice of the dRGT potential parameters, and its scale is given by the graviton mass. Various matter couplings are considered.
Journal
Physics of Particles and Nuclei; ISSN 1063-7796; 
; v. 48(2); p. 287-308
; v. 48(2); p. 287-308
[en] The principle of causality yields the important result that the velocity of a material object cannot be equal to or greater than that of light. Combined with special theory of relativity, it leads to the conclusion that, except for photons, particles of zero rest mass cannot exist in nature. Hence neutrinos of all flavours must be massive. (Author)
Source
Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear (CEADEN), La Habana (Cuba); Instituto Superior de Tecnologias y Ciencias Aplicadas (InSTEC), La Habana (Cuba); Agencia de Energia Nuclear y Tecnologias de Avanzada (AENTA), La Habana (Cuba); 1 CD-ROM; ISBN 978-959-7136-79-8; ; Feb 2011; 584 KB; WONP-NURT 2011: 7. International Symposium on Nuclear and Related Techniques; La Habana (Cuba); 7-11 Feb 2011; 13. Workshop on Nuclear Physics; La Habana (Cuba); 7-11 Feb 2011; Available from Centro de Aplicaciones Tecnologica y Desarrollo Nuclear (CEADEN), La Habana (CU). Email. marta@ceaden.edu.cu; Centro de Gestion de la Informacion y Desarrollo de la Energia (Cubaenergia), La Habana (CU) ,Email. belkis@cubaenergia.cu; 10 refs.
; Feb 2011; 584 KB; WONP-NURT 2011: 7. International Symposium on Nuclear and Related Techniques; La Habana (Cuba); 7-11 Feb 2011; 13. Workshop on Nuclear Physics; La Habana (Cuba); 7-11 Feb 2011; Available from Centro de Aplicaciones Tecnologica y Desarrollo Nuclear (CEADEN), La Habana (CU). Email. marta@ceaden.edu.cu; Centro de Gestion de la Informacion y Desarrollo de la Energia (Cubaenergia), La Habana (CU) ,Email. belkis@cubaenergia.cu; 10 refs.
[en] We construct a supergravity-Maxwell theory with a novel embedding of the Fayet-Iliopoulos D-term, leading to spontaneous supersymmetry breaking. The gauging of the R-symmetry is not required and a gravitino mass is allowed for a generic vacuum. When matter couplings are introduced, an uplift through a positive definite contribution to the scalar potential is obtained. We observe a notable similarity to the uplift constructions and we give a natural description in terms of constrained multiplets.
Journal
Journal of High Energy Physics (Online); ISSN 1029-8479; ; v. 2018(04); p. 32
; v. 2018(04); p. 32
[en] We discuss the running masses of the known quarks. When these are used in the Glashow determinant condition they produce the t quark mass accessible at PETRA and PEP. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; ; v. 39(4); p. 447-450
; v. 39(4); p. 447-450
[en] 't Hooft's conditions for massless composite fermions are discussed. We then study the various mechanisms through which such composite fermions can acquire a small mass. Two new mass generation mechanisms are proposed. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; ; v. 103(6); p. 437-439
; v. 103(6); p. 437-439
[en] The relation between the astrophysical/cosmological conditions and the physical nature of the neutrinos is discussed. In the framework of grand unification theory of interactions and elementary particles, the neutrino rest mass plays an important role. The actual experimental state of neutrino rest mass measurements is presented. (orig./GSCH)
[de]
Im vorliegenden ersten Teil dieses Aufsatzes wird die enge und wechselseitige Verknuepfung zwischen diesen astrophysikalisch-kosmologischen Bedingungen und der physikalischen Natur der Neutrinos behandelt. Dabei spielt im Rahmen der vereinheitlichten Theorie der Kraefte und Elementarteilchen besonders die Ruhmasse der Neutrinos eine Schluesselrolle. Es wird deshalb auch auf den gegenwaertigen Stand experimenteller Neutrinoruhmassenbestimmungen eingegangen. (orig./GSCH)Journal
Physikalische Blaetter; ISSN 0031-9279; ; v. 39(7); p. 233-237
; v. 39(7); p. 233-237
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