7,746 research outputs found
Chiral asymmetry during the EWPT from CP-violating scattering off bubble walls
We compute a net electric current during a first order EWPT arising from the
asymmetric propagation of fermion chiral modes due to a CP-violating
interaction with the Higgs. The interaction is quantified in terms of a
CP-violating phase in the bubble wall that separate both false and true vacuum
phases. We comment on the possibility of this current to generate a seed
magnetic field and its implications for primordial magne- togenesis in the
early Universe.Comment: To appear in the proceedings of the XLVII of the International
Symposium of Multiparticle Dynamics, Tlaxcala, Mexico, September 10-15, 201
The Disconnection Between Sexuality and Reproduction. A Major Challenge for Public Health
Objectives: This chapter aims to reflect on the need to address the issue of sexuality as a process of social construction, more than the predominant biological vision. It also highlights the importance of integrating this position not only in the speeches of sexual and reproductive health but also in programs providing care for people in health institutions
Critical behavior of an Ising model with aperiodic interactions
We write exact renormalization-group recursion relations for a ferromagnetic
Ising model on the diamond hierarchical lattice with an aperiodic distribution
of exchange interactions according to a class of generalized two-letter
Fibonacci sequences. For small geometric fluctuations, the critical behavior is
unchanged with respect to the uniform case. For large fluctuations, the uniform
fixed point in the parameter space becomes fully unstable. We analyze some
limiting cases, and propose a heuristic criterion to check the relevance of the
fluctuations.Comment: latex file, 5 figures, accepted by Braz. Jour. Phy
Polydispersity Effects in the Dynamics and Stability of Bubbling Flows
The occurrence of swarms of small bubbles in a variety of industrial systems
enhances their performance. However, the effects that size polydispersity may
produce on the stability of kinematic waves, the gain factor, mean bubble
velocity, kinematic and dynamic wave velocities is, to our knowledge, not yet
well established. We found that size polydispersity enhances the stability of a
bubble column by a factor of about 23% as a function of frequency and for a
particular type of bubble column. In this way our model predicts effects that
might be verified experimentally but this, however, remain to be assessed. Our
results reinforce the point of view advocated in this work in the sense that a
description of a bubble column based on the concept of randomness of a bubble
cloud and average properties of the fluid motion, may be a useful approach that
has not been exploited in engineering systems.Comment: 11 pages, 2 figures, presented at the 3rd NEXT-SigmaPhi International
Conference, 13-18 August, 2005, Kolymbari, Cret
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