13,267 research outputs found
Kahler Independence of the G2-MSSM
The G2-MSSM is a model of particle physics coupled to moduli fields with
interesting phenomenology both for colliders and astrophysical experiments. In
this paper we consider a more general model - whose moduli Kahler potential is
a completely arbitrary G2-holonomy Kahler potential and whose matter Kahler
potential is also more general. We prove that the vacuum structure and spectrum
of BSM particles is largely unchanged in this much more general class of
theories. In particular, gaugino masses are still supressed relative to the
gravitino mass and moduli masses. We also consider the effects of higher order
corrections to the matter Kahler potential and find a connection between the
nature of the LSP and flavor effects.Comment: Final version, matches the version published in JHE
Phase transition and hybrid star in a SU(2) chiral sigma model
We use a modified SU(2) chiral sigma model to study nuclear matter at high
density using mean field approach. We also study the phase transition of
nuclear matter to quark matter in the interior of highly dense neutron stars.
Stable solutions of Tolman-Oppenheimer-Volkoff equations representing hybrid
stars are obtained with a maximum mass of 1.69 , radii around 9.3
kms and a quark matter core constituting nearly 55-85 % of the star radii.Comment: 19 pages, 9 figures, accepted for Mod. Phys. Letts.
Heterotic strings on G_2 orbifolds
We study compactification of heterotic strings to three dimensions on
orbifolds of G_2 holonomy. We consider the standard embedding and show that the
gauge group is broken from E_8 x E_8 or SO(32) to F_4 x E_8 or SO(25)
respectively. We also compute the spectrum of massless states and compare with
the results obtained from reduction of the 10-dimensional fields. Non-standard
embeddings are discussed briefly. For type II compactifications we verify that
IIB and IIA have equal massless spectrum.Comment: LaTex, 21 page
Towards A Topological G_2 String
We define new topological theories related to sigma models whose target space
is a 7 dimensional manifold of G_2 holonomy. We show how to define the
topological twist and identify the BRST operator and the physical states.
Correlation functions at genus zero are computed and related to Hitchin's
topological action for three-forms. We conjecture that one can extend this
definition to all genus and construct a seven-dimensional topological string
theory. In contrast to the four-dimensional case, it does not seem to compute
terms in the low-energy effective action in three dimensions.Comment: 15 pages, To appear in the proceedings of Cargese 2004 summer schoo
Scherk-Schwarz reduction of M-theory on G2-manifolds with fluxes
We analyse the 4-dimensional effective supergravity theories obtained from
the Scherk--Schwarz reduction of M-theory on twisted 7-tori in the presence of
4-form fluxes. We implement the appropriate orbifold projection that preserves
a G2-structure on the internal 7-manifold and truncates the effective field
theory to an N=1, D=4 supergravity. We provide a detailed account of the
effective supergravity with explicit expressions for the Kaehler potential and
the superpotential in terms of the fluxes and of the geometrical data of the
internal manifold. Subsequently, we explore the landscape of vacua of M-theory
compactifications on twisted tori, where we emphasize the role of geometric
fluxes and discuss the validity of the bottom-up approach. Finally, by reducing
along isometries of the internal 7-manifold, we obtain superpotentials for the
corresponding type IIA backgrounds.Comment: 43 pages, Latex; v3 typos corrected, one reference added, JHEP
versio
Knowledge of Maternal and Newborn Care Among Primary Level Health Workers in Kapilvastu District of Nepal
Background: Higher maternal and neonatal deaths are common in low‑ and middle‑income countries; due to less access to skilled help. Adequate knowledge and skills on maternal and newborn care (MNC) of community health workers can improve maternal and newborn health.Aims: To identify the knowledge of primary level health workers on some components of MNC.Subjects and Methods: Respondents were selected using simple random sampling method. For collecting the data, enumerators visited health institutions for 2 months from 1|st October to 31st November 2012, and structured interview schedule was used to gather the information. A cross‑sectional study was conducted in a total of one hundred and thirty‑seven primary level health workers in Kapilvastu district, Nepal. The Chi‑square test was employed to examine the association between the knowledge of health workers on MNC and designation and work experience. Data were analyzed using SPSS version 17.Results: In a total of 137 primary level health workers, more than half 53.2% (73/137) were senior auxiliary health workers/health assistant. Health workers having correct knowledge on contents of MNC were‑registration 32.1% (44/137), major components of antenatal care 57.7% (79/137), danger signs of pregnancy 39.4% (54/137), five cleans 59.1% (81/137), postnatal health problems 54.0% (74/137), majority to health action to newborn care, newborn bath and meaning of exclusive breastfeeding. There was a statistical association between designation of health workers and above‑mentioned components of MNC (P < 0.05).Conclusions: The differentials in the knowledge of MNC among primary level health suggest improving knowledge of the grass root level health workers with appropriate training and development programs.Keywords: Knowledge, Maternal and newborn care, Primary level health worker
Preliminary PCR-based screening indicates a higher incidence of Porcine Endogenous Retrovirus subtype C (PERV-C) in feral versus domestic swine
Xenotransplantation is considered a potential alternative to allotransplantation to relieve the current shortage of human organs. Due to their similar size and physiology, the organs of pigs are of particular interest for this purpose. Endogenous retroviruses are a result of integration of retroviral genomes into the genome of infected germ cells as DNA proviruses, which are then carried in all cells of the offspring of the organism. Porcine endogenous retroviruses (PERVs) are of special concern because they are found in pig organs and tissues that might otherwise be used for xenotransplantation. PERV proviruses can be induced to replicate and recombine in pigs, and have been shown to infect human cells in vitro. There are three subtypes of PERVs based on differences in the receptor binding domain of the env protein; PERV-A, PERV-B, and PERV-C. PERVs A and B can infect human cells in vitro and can recombine with PERV-C, resulting in a recombinant virus with a higher rate of replication in pig and human cell lines. In this study, we used a PCR-based analysis of 50 domestic and 35 feral pigs to study the distribution of PERVs A, B, and C in swine raised under domestic conditions, versus feral swine from rural areas. PERV-A and PERV-B were universal in both domestic and feral swine. Feral swine had a higher incidence of PERV-C (85.7%) compared to domestic swine (42.0%). Further studies in other feral swine herds are ongoing to verify this observation
Role of Lashuna Rasayana in Margavaranaja Pakshagahta - A Case Study
The health of an individual is accessed by the optimum structural and functional wellbeing. The functional ability of the body may be physiological or physical is attributed to Vata. In morbidity, the same Vatadosha will affect the functionality, in terms of motor or sensory functions. The wide spectrum of disorders due to morbid Vatadosha is put under the heading of Vatavyadhi. Depending upon the affected part of the body further it is categorized as, Ekangavata, Sarvangavata and Pakshaghata. In Pakshaghata Chestanivrutti of one half of the body either left or right may be observed.[1] Pakshghata is one among 80 Nanatmaja Vyadhi.[2] There are three distinct Nidana for Pakshaghata. Dhatukshayaja, Margavarana and Swakopa.[3] Margavarana refers to the obstruction of the Raktamarga. Prime causative factors for Margavarana is Santarpanajanya Nidana leads to Dhamani Pratichyaya ends up in Pakshaghata. In modern science it is better understood as stroke syndrome. Lashunsa Rasayana4 is considered to be best in case of Vata Vyadhi. It is even indicated in Pakshaghata. In the present study role of Lashunsa Rasayana is done on the patients suffering from Margavaranaja Pakshaghata
No Eigenvalue in Finite Quantum Electrodynamics
We re-examine Quantum Electrodynamics (QED) with massless electron as a
finite quantum field theory as advocated by Gell-Mann-Low, Baker-Johnson,
Adler, Jackiw and others. We analyze the Dyson-Schwinger equation satisfied by
the massless electron in finite QED and conclude that the theory admits no
nontrivial eigenvalue for the fine structure constant.Comment: 13 pages, Late
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