Informe bienal (26 abril 1986-27 abril 1988) = Biennial report (26 April 1986-27 April 1988) = Rapport biennal (26 avril 1986-27 avril 1988)

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Informe bienal (28 abril 1988-11 mayo 1990) = Biennial report (28 April 1988-11 May 1990) = Rapport biennal (28 avril 1988-11 mai 1990)

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Informe bienal sobre las actividades de la Comisión desde el 27 de abril de 1979 = Biennial report on the work of the Commission since 27 April 1979

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Informe bienal (12 mayo 1990-15 abril 1992) = Biennial report (12 May 1990-15 April 1992) = Rapport biennal (12 mai 1990-15 avril 1992)

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Informe bienal (16 abril 1992-27 abril 1994) = Biennial report (16 April 1992-27 April 1994) = Rapport biennal (16 avril 1992-27 avril 1994)

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Informe bienal (28 abril 1994-20 abril 1996) = Biennial report (28 April 1994-20 April 1996) = Rapport biennal (28 avril 1994-20 avril 1996)

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Post-sphaleron baryogenesis and an upper limit on the neutron-antineutron oscillation time

A recently proposed scenario for baryogenesis, called post-sphaleron baryogenesis (PSB), is discussed within a class of quark-lepton unified framework based on the gauge symmetry SU(2)L×SU(2) R×SU(4)c realized in the multi-TeV scale. The baryon asymmetry of the Universe in this model is produced below the electroweak phase transition temperature after the sphalerons have decoupled from the Hubble expansion. These models embed naturally the seesaw mechanism for neutrino masses and predict color-sextet scalar particles in the TeV range which may be accessible to the LHC experiments. A necessary consequence of this scenario is the baryon-number-violating ΔB=2 process of neutron-antineutron (n-n̄) oscillations. In this paper we show that the constraints of PSB, when combined with the neutrino oscillation data and restrictions from flavor changing neutral currents mediated by the colored scalars, imply an upper limit on the n-n̄ oscillation time of 5×1010 sec regardless of the quark-lepton unification scale. If this scale is relatively low, in the (200-250) TeV range, τn-n̄ is predicted to be less than 1010 sec, which is accessible to the next generation of proposed experiments. © 2013 American Physical Society.

Bright solitons in quasi-one-dimensional dipolar condensates with spatially modulated interactions

We introduce a model for the condensate of dipolar atoms or molecules, in which the dipole-dipole interaction (DDI) is periodically modulated in space due to a periodic change of the local orientation of the permanent dipoles, imposed by the corresponding structure of an external field (the necessary field can be created, in particular, by means of magnetic lattices, which are available to the experiment). The system represents a realization of a nonlocal nonlinear lattice, which has a potential to support various spatial modes. By means of numerical methods and variational approximation (VA), we construct bright one-dimensional solitons in this system and study their stability. In most cases, the VA provides good accuracy and correctly predicts the stability by means of the Vakhitov-Kolokolov criterion. It is found that the periodic modulation may destroy some solitons, which exist in the usual setting with unmodulated DDI and can create stable solitons in other cases, not verified in the absence of modulations. Unstable solitons typically transform into persistent localized breathers. The solitons are often mobile, with inelastic collisions between them leading to oscillating localized modes. © 2013 American Physical Society.

Biennial report (3 July 2004-24 March 2006)

Includes bibliography

Biennial report (25 March 2006 - 13 June 2008)

Includes bibliography