2,445 research outputs found
Neutron-star Radius from a Population of Binary Neutron Star Mergers
We show how gravitational-wave observations with advanced detectors of tens
to several tens of neutron-star binaries can measure the neutron-star radius
with an accuracy of several to a few percent, for mass and spatial
distributions that are realistic, and with none of the sources located within
100 Mpc. We achieve such an accuracy by combining measurements of the total
mass from the inspiral phase with those of the compactness from the postmerger
oscillation frequencies. For estimating the measurement errors of these
frequencies we utilize analytical fits to postmerger numerical-relativity
waveforms in the time domain, obtained here for the first time, for four
nuclear-physics equations of state and a couple of values for the mass. We
further exploit quasi-universal relations to derive errors in compactness from
those frequencies. Measuring the average radius to well within 10% is possible
for a sample of 100 binaries distributed uniformly in volume between 100 and
300 Mpc, so long as the equation of state is not too soft or the binaries are
not too heavy.Comment: 9 pages and 7 figure
Increasing number of secondary dengue cases: a concern
ackground: Dengue fever is caused by mosquito borne arbovirus of family Flaviviridae, Aedes agypti as the principle vector. In the recent past Delhi has witnessed several outbreaks affecting thousands of individuals and many of them get re-infected during subsequent years forming a bulk of secondary dengue cases putting them at risk of developing severe dengue.Methods: A total of 150 serum samples from suspected dengue cases were tested for dengue fever by NS-1 antigen and IgM antibody enzyme-linked immunosorbent assay (ELISA) followed by categorization into primary and secondary dengue using IgG avidity ELISA.Results: Out of total 150 clinically suspected dengue cases, 56 were positive either by Dengue NS-1 antigen or dengue IgM antibody or both. On the basis of dengue IgG avidity ELISA among 56 diagnosed dengue cases, 30 (53.57%) were found to be of secondary dengue.Conclusions: There is increasing trend of dengue cases in Delhi since past one decade. Being hyper-endemic area for dengue, more than 25% population have been reported to have past infection of dengue. Due to increased prevalence and simultaneous circulation of more than one serotypes, number of secondary dengue cases is also increasing. Since majority of severe dengue cases are associated with secondary dengue, early diagnosis and treatment can significantly reduce the fatal outcome. Thus, avidity testing for IgG antibody becomes an important tool
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