1,336 research outputs found
The Swan Song of a Neutron Star Binary:Fundamental physics and astrophysics with gravitational waves from compact binary coalescence
Brand, J.F.J. van den [Promotor]Broeck, C.F.F. van den [Copromotor
Sustainable valorisation of organic urban wastes : insights from African case studies
Understanding the problems and potentials of the organic waste stream is perhaps the single most important step that city authorities in Africa could take in moving towards sustainable, affordable, effective and efficient waste management. This publication presents four examples of recent attempts to manage organic waste sustainably in the African context. The participants in the ‘Nairobi organic urban waste’ project have structured this case exercise in order to use the case studies as object lessons, to harvest genuine insights into the feasibility of a variety of ways to successfully and sustainably valorise urban organic waste streams. Three contemporary case examples of compost production are presented. These include composting by a community-based organisation in the Kenyan private sector and by a public-private partnership in Malawi. In all three cases, the project and case study focus is on the relations between city waste and the agricultural supply chain. A fourth case study describes the technical and economic potential to produce and use biogas from urban organic waste
Core collapse in massive scalar-tensor gravity
This paper provides an extended exploration of the inverse-chirp
gravitational-wave signals from stellar collapse in massive scalar-tensor
gravity reported in [Phys. Rev. Lett. {\bf 119}, 201103]. We systematically
explore the parameter space that characterizes the progenitor stars, the
equation of state and the scalar-tensor theory of the core collapse events. We
identify a remarkably simple and straightforward classification scheme of the
resulting collapse events. For any given set of parameters, the collapse leads
to one of three end states, a weakly scalarized neutron star, a strongly
scalarized neutron star or a black hole, possibly formed in multiple stages.
The latter two end states can lead to strong gravitational-wave signals that
may be detectable in present continuous-wave searches with ground-based
detectors. We identify a very sharp boundary in the parameter space that
separates events with strong gravitational-wave emission from those with
negligible radiation.STFC Consolidator Grant No. ST/P000673/1
GWverse COST Action Grant No. CA16104
H2020-ERC-MaGRaTh–646597
NSF-XSEDE Grant No. PHY-090003
DiRRAC through STFC capital Grants No. ST/P002307/1 and No. ST/R002452/1, and STFC operations Grant No. ST/R00689X/
Testing the no-hair theorem with black hole ringdowns using TIGER
The Einstein Telescope (ET), a proposed third-generation gravitational wave
observatory, would enable tests of the no-hair theorem by looking at the
characteristic frequencies and damping times of black hole ringdown signals. In
previous work it was shown that with a single black hole
at distance Gpc (or redshift ), deviations of a few
percent in the frequencies and damping times of dominant and sub-dominant modes
would be within the range of detectability. Given that such sources may be
relatively rare, it is of interest to see how well the no-hair theorem can be
tested with events at much larger distances and with smaller signal-to-noise
ratios, thus accessing a far bigger volume of space and a larger number of
sources. We employ a model selection scheme called TIGER (Test Infrastructure
for GEneral Relativity), which was originally developed to test general
relativity with weak binary coalescence signals that will be seen in
second-generation detectors such as Advanced LIGO and Advanced Virgo. TIGER is
well-suited for the regime of low signal-to-noise ratio, and information from a
population of sources can be combined so as to arrive at a stronger test. By
performing a range of simulations using the expected noise power spectral
density of Einstein Telescope, we show that with TIGER, similar deviations from
the no-hair theorem as considered in previous work will be detectable with
great confidence using sources distributed uniformly in
co-moving volume out to 50 Gpc ().Comment: 11 pages, 20 figures. Matches version in PR
Constraining the neutron star equation of state with gravitational wave signals from coalescing binary neutron stars
Recently exploratory studies were performed on the possibility of constraining the neutron star equation of state (EOS) using signals from coalescing binary neutron stars, or neutron star–black hole systems, as they will be seen in upcoming advanced gravitational wave detectors such as Advanced LIGO and Advanced Virgo. In particular, it was estimated to what extent the combined information from multiple detections would enable one to distinguish between different equations of state through hypothesis ranking or parameter estimation. Under the assumption of zero neutron star spins both in signals and in template waveforms and considering tidal effects to 1 post-Newtonian (1PN) order, it was found that O(20) sources would suffice to distinguish between a stiff, moderate, and soft equation of state. Here we revisit these results, this time including neutron star tidal effects to the highest order currently known, termination of gravitational waveforms at the contact frequency, neutron star spins, and the resulting quadrupole-monopole interaction. We also take the masses of neutron stars in simulated sources to be distributed according to a relatively strongly peaked Gaussian, as hinted at by observations, but without assuming that the data analyst will necessarily have accurate knowledge of this distribution for use as a mass prior. We find that especially the effect of the latter is dramatic, necessitating many more detections to distinguish between different EOSs and causing systematic biases in parameter estimation, on top of biases due to imperfect understanding of the signal model pointed out in earlier work. This would get mitigated if reliable prior information about the mass distribution could be folded into the analyses
Characterization of a novel angular dioxygenase from fluorene-degrading Sphingomonas sp. strain LB126
In this study, the genes involved in the initial attack on fluorene by
Sphingomonas sp. LB126 were investigated. The ? and ? subunits of a dioxygenase
complex (FlnA1A2), showing 63% and 51% sequence identity respectively, with the
subunits of an angular dioxygenase from Gram-positive Terrabacter sp. DBF63,
were identified. When overexpressed in E. coli, FlnA1A2 was responsible for the
angular oxidation of fluorene, fluorenol, fluorenone, dibenzofuran and
dibenzo-p-dioxin. Moreover, FlnA1A2 was able to oxidize polycyclic aromatic
hydrocarbons and heteroaromatics, some of which were not oxidized by the
dioxygenase from Terrabacter sp. DBF63. Quantification of resulting oxidation
products showed that fluorene and phenanthrene were preferred substrates
Towards a generic test of the strong field dynamics of general relativity using compact binary coalescence: Further investigations
In this paper we elaborate on earlier work by the same authors in which a
novel Bayesian inference framework for testing the strong-field dynamics of
General Relativity using coalescing compact binaries was proposed. Unlike
methods that were used previously, our technique addresses the question whether
one or more 'testing coefficients' (e.g. in the phase) parameterizing
deviations from GR are non-zero, rather than all of them differing from zero at
the same time. The framework is well-adapted to a scenario where most sources
have low signal-to-noise ratio, and information from multiple sources as seen
in multiple detectors can readily be combined. In our previous work, we
conjectured that this framework can detect generic deviations from GR that can
in principle not be accomodated by our model waveforms, on condition that the
change in phase near frequencies where the detectors are the most sensitive is
comparable to that induced by simple shifts in the lower-order phase
coefficients of more than a few percent ( radians at 150 Hz). To
further support this claim, we perform additional numerical experiments in
Gaussian and stationary noise according to the expected Advanced LIGO/Virgo
noise curves, and coherently injecting signals into the network whose phasing
differs structurally from the predictions of GR, but with the magnitude of the
deviation still being small. We find that even then, a violation of GR can be
established with good confidence.Comment: 15 pages, 7 figures, Amaldi 9 proceeding
Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the quantum limit is the injection of squeezed vacuum states of light into the interferometer's dark port. Here, we report on the successful application of this quantum technology to improve the shot noise limited sensitivity of the Advanced Virgo gravitational-wave detector. A sensitivity enhancement of up to 3.2±0.1 dB beyond the shot noise limit is achieved. This nonclassical improvement corresponds to a 5%-8% increase of the binary neutron star horizon. The squeezing injection was fully automated and over the first 5 months of the third joint LIGO-Virgo observation run O3 squeezing was applied for more than 99% of the science time. During this period several gravitational-wave candidates have been recorded
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