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- Universidade Federal do Rio de JaneiroBR853 papers
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9 papers · 1 filter
Magnetic Collapse of a Neutron Gas: No Magnetar Formation
Aurora Perez Martinez, Hugo Perez Rojas, Herman J. Mosquera Cuesta
A degenerate neutron gas in equilibrium with a background of electrons and protons in a magnetic field exerts its pressure anisotropically, having a smaller value perpendicular tha…
Can large fermion chemical potentials suppress the electroweak phase transition ?
Carlos Quimbay, John Morales, Rafael Hurtado
We calculate the critical temperature ) of the electroweak phase transition in the minimal standard model considering simultaneously temperature () and fermion chemical po…
Classical and Quantum Hamiltonian Ratchets
Holger Schanz, Marc-Felix Otto, Roland Ketzmerick +1
We explain the mechanism leading to directed chaotic transport in Hamiltonian systems with spatial and temporal periodicity. We show that a mixed phase space comprising both regula…
Bounds for Lepton Flavor Violation and the Pseudoscalar Higgs in the General Two Higgs Doublet Model using muon factor
Rodolfo A. Diaz, R. Martinez, J. -Alexis Rodriguez
Current experimental data from the muon factor, seems to show the necessity of physics beyond the Standard Model (SM), since the difference between SM and experimental predic…
Lepton Flavor Violation in the Two Higgs Doublet Model type III
R. Diaz, R. Martinez, J. -Alexis Rodriguez
We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level in the leptonic sector. In the framework of this mo…
Gravity-induced Wannier-Stark ladder in an optical lattice
J. Zapata, A. M. Guzman, M. G. Moore +1
We discuss the dynamics of ultracold atoms in an optical potential accelerated by gravity. The positions and widths of the Wannier-Stark ladder of resonances are obtained as metast…