5,684 research outputs found
Bubble wall dynamics, generalised Yukawa couplings and adequate electroweak baryogenesis in two-Higgs-doublet model
Baryogenesis at the electroweak scale depends on divers but identifiable
details of bubble wall dynamics and the particle physics. We show that
inclusion of the dynamics of relative phase in two-Higgs-doublet model (2HDM)
enhances the adiabatic order of the mechanism proposed by
McLerran-Shaposhnikov-Turok-Voloshin where the scalar-scalar-vector triangle
diagram with top quark in the loop gives rise to a significant contribution to
the effective chemical potential biasing the Chern-Simons number. We also show
that in 2HDM with less stringent constraints on Yukawa couplings than those
imposed by natural flavour conservation, there are additional diagrams
contributing to the effective chemical potential. These two effects can combine
with several others to produce adequate baryon asymmetry at the electroweak
scale.Comment: 7 pages, Latex, figures available upon reques
Cosmic Strings at the Electroweak Phase Transition
If cosmic strings are present at the electroweak phase transition, they can
act as seeds on which bubbles of true vacuum nucleate. We explore the nature of
such a phase transition, in particular the wall velocity and thickness of the
bubbles. {}From the viewpoint of electroweak baryogenesis, adiabatic conditions
exist in the expanding bubble walls, and such models of baryogenesis can be
successfully applied. In the present mechanism, the nature of the electroweak
phase transition is insensitive to the other details of the model, thus
reducing the uncertainties in the estimate of net baryon asymmetry.Comment: 11 Pages (figure available on request
Synthesis and Characterization of PT(II) Complexes for Anticancer Therapy
The first platinum-based drug was discovered and approved by Food and Drug Administration (FDA) in 1978 is cis-diamminedichloroplatinum (II) (cisplatin or CDDP). Cisplatin is used for about 50% of the chemotherapeutic cancer treatments along with its two analogues carboplatin and oxaliplatin. So far these drugs have been used extensively as treatment for ovarian, bladder, head and neck, and lung cancers. Although cisplatin has been used so often, it has toxic side effects and drug resistance.1-4 Due to these limitations other compounds have been synthesized. Specifically, our lab in conjunction with a biochemistry lab has recently published one article in this area. This project is a continuation to the development of anticancer drugs
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Discontinuous precipitation of Co3V in a complex Co-based alloy
Discontinuous precipitation of chromium-rich Co3V lamellae has been found in a Co-based alloy containing 2 wt% V after prolonged ageing at 800 {\degr}C. This discontinuous precipitation is associated with a noticeable redistribution of alloying elements in the alloy relative to those parts of the aged alloy that preserve the c.c.p.-L12 microstructure found in the as-cast and homogenized condition. The orientation relationship between the c.c.p. Co-rich matrix and these hexagonal phase chromium-rich Co3V precipitates is shown to be || and [1 1 1]Co || , i.e. || and [1 1 1]Co || in the four-index notation. 3 × 3 transformation matrices relating directions and planes in the two phases have been established. The observed orientation relationship between the two phases is consistent with low lattice misfit between the two phases.We would also like to acknowledge the EPSRC/Rolls-Royce plc Strategic
Partnership (EP/H500375/1) for funding this work.This is the author accepted manuscript. The final version can be found on the publisher's website at: http://www.tandfonline.com/doi/abs/10.1080/14786435.2013.861946#.U8fYa_ldXH
Effect of paclobutrazol and sucrose on in vitro cormel formation in gladiolus
Studies with excised shoots of six gladiolus cultivars viz., Bellariana, Blue Moon, Cream White, Friendship, Her Majesty and Top Brass indicated that paclobutrazol enhanced early cormel initiation and development. The interaction between paclobutrazol and sucrose was significant for cormel size. Supplementation of 10 mg L–1 paclobutrazol and 120 g L–1 sucrose to Murashige and Skoog’s medium favored formation of bigger cormels. Among the cultivars response to exogenous sucrose supplementation varied significantly and absence of paclobutrazol produced longer leaves, roots and smaller cormels
Shell model study of the pairing correlations
A systematic study of the pairing correlations as a function of temperature
and angular momentum has been performed in the sd-shell region using the
spherical shell model approach. The pairing correlations have been derived for
even-even, even-odd and odd-odd systems near N=Z and also for the asymmetric
case of N=Z+4. The results indicate that the pairing content and the behavior
of pair correlations is similar in even-even and odd-mass nuclei. For odd-odd
N=Z system, angular momentum I=0 state is an isospin, t=1 neutron-proton paired
configuration. Further, these t=1 correlations are shown to be dramatically
reduced for the asymmetric case of N=Z+4. The shell model results obtained are
qualitatively explained within a simplified degenerate model
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