44 research outputs found
The ghotul in muria society
This thesis is a field study of the Muria of Bastar district, Madhya Pradesh, India. The Muria Gonds are a tribal (adivasi) group practicing paddy agriculture in a heavily forested area. Chapters 1 to 7 of the thesis describe the setting, and the major features of Muria social structure. Chapters 8 to 10 are devoted to the most distinctive and well-known Muria social institutions, the Ghotul dormitory for the unmarried boys and girls of the village
Wash-Out in N_2-dominated leptogenesis
We study the wash-out of a cosmological baryon asymmetry produced via
leptogenesis by subsequent interactions. Therefore we focus on a scenario in
which a lepton asymmetry is established in the out-of-equilibrium decays of the
next-to-lightest right-handed neutrino. We apply the full classical Boltzmann
equations without the assumption of kinetic equilibrium and including all
quantum statistical factors to calculate the wash-out of the lepton asymmetry
by interactions of the lightest right-handed state. We include scattering
processes with top quarks in our analysis. This is of particular interest since
the wash-out is enhanced by scatterings and the use of mode equations with
quantum statistical distribution functions. In this way we provide a
restriction on the parameter space for this scenarios.Comment: 26 pages, 4 figures, profound revision, exposition is now in flavor
notation, one plot and discussion added, numerical error corrected, three
plots changed, text polished, main results remain unchanged, reference
added,matches published versio
Stability and renormalization of Yang-Mills theory with Background Field Method: a regularization independent proof
In this paper the stability and the renormalizability of Yang-Mills theory in
the Background Field Gauge are studied. By means of Ward Identities of
Background gauge invariance and Slavnov-Taylor Identities the stability of the
classical model is proved and, in a regularization independent way, its
renormalizability is verified. A prescription on how to build the counterterms
is given and the possible anomalies which may appear for Ward Identities and
for Slavnov-Taylor Identities are shown.Comment: 25 pages, Latex 2.09, no figure
bosons in supersymmetric models confront electroweak data
We study constraints on additional bosons predicted in the
supersymmetric (SUSY) models by using the updated results of electroweak
experiments -- -pole experiments, measurements and low-energy neutral
current (LENC) experiments. We find that the effects of - mixing are
parametrized by (i) a tree-level contribution to the -parameter, (ii) the
effective - mass mixing angle \xibar. In addition, the effect of the
direct exchange of the heavier mass eigenstate in the LENC processes is
parametrized by (iii) a contact term \contact. We give the theoretical
predictions for the observables in the electroweak experiments together with
the standard model radiative corrections. Constraints on and
\xibar from the -pole and experiments and those on \contact from
the LENC experiments are separately shown. Impacts of the kinetic mixing
between the and gauge bosons on the
-analysis are studied. We show the 95% CL lower mass limit of as
a function of the effective - mixing parameter , a combination of
the mass and kinetic mixings. Theoretical prediction on and is
found for the and models by assuming the minimal
particle content of the SUSY models. In a certain region of the parameter
space, the boson mass in the detectable range of LHC is still allowed.Comment: LaTeX, 36pages, 4 figures. One referece added. Final version to
appear in Nucl. Phys.
Spontaneous CP Phases and Flavour Changing Neutral Currents in the Left-Right Symmetric Model
We study the behaviour of the flavour changing neutral currents in the
Left-Right Symmetric Model related to the presence of spontaneous CP phases. To
do this, we explore four cases corresponding to combinations of maximal and no
CP violation in both the lepton and quark sector. We find that we can constrain
the flavour changing neutral currents to the experimental limit, by adjusting
the CP-violating phase of the quark sector, opening the possibility to obtain a
large CP violation in the lepton sector as well as new Higgs bosons at the
electroweak scale.Comment: LaTex File, 31 pages, no figures. Minor grammatical changes.
References updated and one added. Version to appear in Nuclear Physics
Are the New Physics Contributions from the Left-Right Symmetric Model Important for the Indirect CP Violation in the Neutral B Mesons?
Several works analyzing the new physics contributions from the Left-Right
Symmetric Model to the CP violation phenomena in the neutral B mesons can be
found in the literature. These works exhibit interesting and experimentally
sensible deviations from the Standard Model predictions but at the expense of
considering a low right scale \upsilon_R around 1 TeV. However, when we stick
to the more conservative estimates for \upsilon_R which say that it must be at
least 10^7 GeV, no experimentally sensible deviations from the Standard Model
appear for indirect CP violation. This estimate for \upsilon_R arises when the
generation of neutrino masses is considered. In spite of the fact that this
scenario is much less interesting and says nothing new about both the CP
violation phenomenon and the structure of the Left-Right Symmetric Model, this
possibility must be taken into account for the sake of completeness and when
considering the see-saw mechanism that provides masses to the neutrino sector.Comment: LaTex file. 19 pages, 4 figures. Change in the way the paper address
the problem. As a result, change in title, abstract, and some sections.
Conclusions unchanged. Version to appear in Foundations of Physics Letter
Looking ahead: forecasting and planning for the longer-range future, April 1, 2, and 3, 2005
This repository item contains a single issue of the Pardee Conference Series, a publication series that began publishing in 2006 by the Boston University Frederick S. Pardee Center for the Study of the Longer-Range Future. This was the Center's spring Conference that took place during April 1, 2, and 3, 2005.The conference allowed for many highly esteemed scholars and professionals from a broad range of fields to come together to discuss strategies designed for the 21st century and beyond. The speakers and discussants covered a broad range of subjects including: long-term policy analysis, forecasting for business and investment, the National Intelligence Council Global Trends 2020 report, Europe’s transition from the Marshal plan to the EU, forecasting global transitions, foreign policy planning, and forecasting for defense
The Role of Demography in the Transition to Sustainable Societies
Currently, although the global population has surpassed 7.5 billion and continues to increase in about 80 million each year, attention to demography is almost absent in most of the studies and publications related to the current situation of planetary emergency and the necessary transition to sustainable societies. For this reason, our first aim in this paper has been to discuss if this current lack of attention to demography is justified or not. With this purpose, we begin considering the scientific meaning of Sustainability, in order to overlay distorted and impoverish views of this concept that may hinder our study. Then, we analyse the reasons given by experts for and against the incidence of demographic growth in the current unsustainable situation of planetary emergency. Finally, we present proposals to face the ensemble of interconnected socio-environmental problems (including demographic evolution), to make possible an appropriate transition to sustainable societies. Aunque la población mundial ha sobrepasado los 7500 millones y continúa aumentando anualmente en alrededor de 80 millones, la atención a la demografía está hoy prácticamente ausente en la mayoría de los estudios y publicaciones acerca de la actual situación de emergencia planetaria y la necesidad de una transición a sociedades sostenibles. Con el propósito de analizar si esta falta de atención a la demografía está o no justificada, en esta contribución comenzamos discutiendo el significado científico de Sostenibilidad socioambiental, para evitar concepciones distorsionadas y empobrecidas de este concepto que pueden dificultar dicho análisis. A continuación estudiaremos las razones dadas por distintos expertos a favor y en contra de la incidencia del crecimiento demográfico en la insostenible situación actual de emergencia planetaria. Finalmente presentamos propuestas para hacer frente al conjunto de problemas estrechamente interconectados - incluido el problema demográfico - que caracterizan dicha situación, para hacer así posible una adecuada transición a sociedades sostenibles