Relatives of cyanomethylene: replacement of the divalent carbon by B−, N+, Al−, Si, P+, Ga−, Ge, and As+

Abbott, Boyi Z.; Hoobler, Preston R.; Schaefer, Henry F.

doi:10.1039/c9cp05777c

Cited by 13 publications

(12 citation statements)

References 138 publications

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“…Our ability to experimentally validate GR (or otherwise) in the strong-field regime is continually improving, with now over a dozen measurements of gravitational waves from events involving BHs [46]. For this reason, there is interest in developing generic, parameterised BH spacetimes [22][23][24], with the goal of using these to test for a variety of hypothetical deviations from the Kerr metric in a theory-agnostic way.…”

Section: Discussionmentioning

confidence: 99%

Quantifying closeness between black hole spacetimes: a superspace approach

Suvorov

2020

Class. Quantum Grav.

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The set of all metrics that can be placed on a given manifold defines an infinite-dimensional 'superspace' that can itself be imbued with the structure of a Riemannian manifold. Geodesic distances between points on Met(M) measure how close two different metrics over M are to one another. Restricting our attention to only those metrics that describe physical black holes, these distances may therefore be thought of as measuring the level of geometric similarity between different black hole structures. This allows for a systematic quantification of the extent to which a black hole, possibly arising as an exact solution to a theory of gravity extending general relativity in some way, might be 'non-Kerr'. In this paper, a detailed construction of a superspace for stationary black holes with an arbitrary number of hairs is carried out. As an example application, we are able to strengthen a recent claim made by Konoplya and Zhidenko about which deviation parameters describing a hypothetical, non-Schwarzschild black hole are likely to be most relevant for astrophysical observables.

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Section: Discussionmentioning

confidence: 99%

Quantifying closeness between black hole spacetimes: a superspace approach

Suvorov

2020

Class. Quantum Grav.

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“…After a detection, LISA will generate a posterior probability density for the sky localization of the source in the sky, similarly to what is routinely done by groundbased gravitational-wave detectors (e.g. Singer & Price (2016); Abbott et al (2019)). If the binary is detected sufficiently early, however, the localization will most likely receive periodic updates as more data is acquired, and will become more and more precise over time, "zooming" into the final estimate.…”

Section: Gravitational-wave Observationmentioning

confidence: 99%

Detectability of Modulated X-Rays from LISA’s Supermassive Black Hole Mergers

Canton

Mangiagli

Noble

et al. 2019

ApJ

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One of the central goals of LISA is the detection of gravitational waves from the merger of supermassive black holes. Contrary to stellar-mass black hole mergers, such events are expected to be rich X-ray sources due to the accretion of material from the circumbinary disks onto the black holes. The orbital dynamics before merger is also expected to modulate the resulting X-ray emission via Doppler boosting in a quasi-periodic way, and in a simple phase relation with the gravitational wave from the inspiral of the black holes. Detecting the X-ray source would enable a precise and early localization of the binary, thus allowing many telescopes to observe the very moment of the merger. Although identifying the correct X-ray source in the relatively large LISA sky localization will be challenging due to the presence of many confounding point sources, the quasi-periodic modulation may aid in the identification. We explore the practical feasibility of such idea. We simulate populations of merging supermassive black holes, their detection with LISA and their X-ray lightcurves using a simple model. Taking the parameters of the X-ray Telescope on the proposed NASA Transient Astrophysics Probe, we then design and simulate an observation campaign that searches for the modulated X-ray source while LISA is still observing the inspiral of the black holes. Assuming a fiducial LISA detection rate of 10 mergers per year at redshift closer than 3.5, we expect a few detections of modulated X-ray counterparts over the nominal duration of the LISA mission.

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“…The third observing run (O3), which began in April 2019, has already yielded the detection of many binary black hole systems (Singer et al 2019a;Shawhan et al 2019;Chatterjee et al 2019a;Singer et al 2019b;Chatterjee et al 2019b;Ghosh et al 2019) and a few with at least one neutron star (Singer et al 2019b;Chatterjee et al 2019b). This builds on the success of the Advanced LIGO and Advanced Virgo first and second observing runs, which led to ten binary black hole detections (Abbott et al 2018) and the detection of one binary neutron star (BNS) merger GW170817 (Abbott et al 2017a). The BNS detection was unique in many ways, including the observation of the electromagnetic signature of the ejected matter.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, with the two LIGO detectors having more than twice the sensitivity of Virgo during O3, and with different antenna pattern distributions over the three detectors, the two-detector observations will be the most likely case for any binary neutron star merger candidate in O3. This will effect the 1-50 BNS detections expected during O3, and will continue to be important into O4, when the number of expected detections varies between 4-80 per year (Abbott et al 2018). Note that the angle-averaged binary neutron star range is already at 140 Mpc for LIGO Livingston (and about 120 Mpc for LIGO Hanford), whereas available catalogs such as GLADE (Dálya et al 2018) are only complete below ∼ 100 Mpc (although nearly complete at ∼ 150 Mpc).…”

Section: Introductionmentioning

confidence: 99%

Optimizing multitelescope observations of gravitational-wave counterparts

Coughlin

Antier

Corre

et al. 2019

Monthly Notices of the Royal Astronomical Society

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The ever-increasing sensitivity of the network of gravitational-wave detectors has resulted in the accelerated rate of detections from compact binary coalescence systems in the third observing run of Advanced LIGO and Advanced Virgo. Not only has the event rate increased, but also the distances to which phenomena can be detected, leading to a rise in the required sky volume coverage to search for counterparts. Additionally, the improvement of the detectors has resulted in the discovery of more compact binary mergers involving neutron stars, revitalizing dedicated follow-up campaigns. While significant effort has been made by the community to optimize single telescope observations, using both synoptic and galaxy-targeting methods, less effort has been paid to coordinated observations in a network. This is becoming crucial, as the advent of gravitational-wave astronomy has garnered interest around the globe, resulting in abundant networks of telescopes available to search for counterparts. In this paper, we extend some of the techniques developed for single telescopes to a telescope network. We describe simple modifications to these algorithms and demonstrate them on existing network examples. These algorithms are implemented in the opensource software gwemopt, used by some follow-up teams, for ease of use by the broader community.

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Relatives of cyanomethylene: replacement of the divalent carbon by B⁻, N⁺, Al⁻, Si, P⁺, Ga⁻, Ge, and As⁺

Abstract: The lowest lying singlet and triplet states of nine relatives of cyanomethylene are studied with highly rigorous ab initio methods, and periodic trends in their electronic structures are analyzed.

Cited by 13 publications

References 138 publications

Quantifying closeness between black hole spacetimes: a superspace approach

Quantifying closeness between black hole spacetimes: a superspace approach

Detectability of Modulated X-Rays from LISA’s Supermassive Black Hole Mergers

Optimizing multitelescope observations of gravitational-wave counterparts

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