223 research outputs found
Inferring the astrophysical population of gravitational wave sources in the presence of noise transients
No full textThe global network of interferometric gravitational wave (GW) observatories (LIGO, Virgo, KAGRA) has detected and characterized nearly 100 mergers of binary compact objects. However, many more real GWs are lurking sub-Threshold, which need to be sifted from terrestrial-origin noise triggers (known as glitches). Because glitches are not due to astrophysical phenomena, inference on the glitch under the assumption it has an astrophysical source (e.g. binary black hole coalescence) results in source parameters that are inconsistent with what is known about the astrophysical population. In this work, we show how one can extract unbiased population constraints from a catalogue of both real GW events and glitch contaminants by performing Bayesian inference on their source populations simultaneously. In this paper, we assume glitches come from a specific class with a well-characterized effective population (blip glitches). We also calculate posteriors on the probability of each event in the catalogue belonging to the astrophysical or glitch class, and obtain posteriors on the number of astrophysical events in the catalogue, finding it to be consistent with the actual number of events included
A Century of Mathematical Excellence at Spelman College
No full textThis file consists of the presentation slides of a presentation by Colm Mulcahy at the AMS-NAM Joint Special Session on The Mathematics of the Atlanta University Center. The event was held Thursday January 5, 2017, 8:00 a.m.-4:00 p.m. at the Marriott Marquis in Atlanta, Georgia. KEYWORDS: Mathematics, Spelman College, Histor
Massively parallel Bayesian inference for transient gravitational-wave astronomy
No full textUnderstanding the properties of transient gravitational waves (GWs) and their sources is of broad interest in physics and astronomy. Bayesian inference is the standard framework for astrophysical measurement in transient GW astronomy. Usually, stochastic sampling algorithms are used to estimate posterior probability distributions over the parameter spaces of models describing experimental data. The most physically accurate models typically come with a large computational overhead which can render data analsis extremely time consuming, or possibly even prohibitive. In some cases highly specialized optimizations can mitigate these issues, though they can be difficult to implement, as well as to generalize to arbitrary models of the data. Here, we investigate an accurate, flexible, and scalable method for astrophysical inference: parallelized nested sampling. The reduction in the wall-time of inference scales almost linearly with the number of parallel processes running on a high-performance computing cluster. By utilizing a pool of several hundreds or thousands of CPUs in a high-performance cluster, the large wall times of many astrophysical inferences can be alleviated while simultaneously ensuring that any GW signal model can be used ‘out of the box’, i.e. without additional optimization or approximation. Our method will be useful to both the LIGO-Virgo-KAGRA collaborations and the wider scientific community performing astrophysical analyses on GWs. An implementation is available in the open source gravitational-wave inference library pBilby (parallel bilby)
Short Stories, Novels and Spain. An Interview With Colm Tóibín
No full textColm Tóibín (Enniscorthy, 1955) is the author of five novels, The South (1990), The Heather Blazing (1992), The Story of the Night (1996), The Blackwater Lightship(1999) and The Master (2004). This last novel won the IMPAC Dublin Literary Award, the Los Angeles Times Novel of the Year, the Prix du Meilleur Livre Etranger for the best foreign novel published in 2005 in France, and it was shortlisted for the Man Booker Prize. Colm Tóibín has a long career in journalism and was the editor of the magazine Magill from 1982 to 1985. He is also the author of several non-fiction books, including Homage to Barcelona (1990) and The Sign of the Cross: Travels in Catholic Europe (1994). He edited The Penguin Book of Irish Fiction (1999) and has recently published his first book of short stories,Mothers and Sons (2006). Colm Tóibín attended the 10th International Conference on the Short Story in English, held at University College Cork on 19-21 June 2008, where this interview took place
A Guest at the Feast
No full textColm Tóibín\u27s touching memoir, A Guest at the Feast, beautifully read by the author himself. A Guest at the Feast moves from the small town of Enniscorthy to Dublin, from memories of a mother who always had a book on the go to the author\u27s early adulthood, from a love of literature to the influences of place and family. Tóibín\u27s captivating memoir is the story of a writer coming of age and his connections between home, work and love. It is a perfect gem of a book.https://corescholar.libraries.wright.edu/dlpp_all/1452/thumbnail.jp
[CODE] joshspeagle/dynesty: v2.1.3
No full textThis is mostly a bug fix release. Some changes to bounding strategy. Some warnings were added. See more details in the changelog.Sergey Koposov, Josh Speagle, Kyle Barbary, Gregory Ashton, Ed Bennett, Johannes Buchner, Carl Scheffler, Ben Cook, Colm Talbot, James Guillochon, Patricio Cubillos, Andrés Asensio Ramos, Ben Johnson, Dustin Lang, Ilya, Matthieu Dartiailh, Alex Nitz, Andrew McCluskey, & Anne Archibald. (2023). joshspeagle/dynesty: v2.1.3 (v2.1.3). Zenodo. https://doi.org/10.5281/zenodo.840870
Making-with, Making-do: Constellations of Concepts and Practices around Adaptive Reuse
No full textEvery demolition is an act of violence with devastating ecological and cultural repercussions that reverberate for generations. Responding to a reality in which not just buildings but even entire communities are treated as disposable, this research supports and advances adaptive reuse as a more sustainable alternative to wasteful construction models based on demolition and reconstruction. To do so, it engages not only with the material, technical and economic aspects of reusing existing buildings, but also with the wider historical, political and socio-cultural contexts that influence and shape every architectural act.
Representing an exercise in sympoiesis or ‘making-with’, the project deliberately positions itself between practice and research. Through engaging in conversation with a range of practitioners and thinkers, it emphasises how adaptive reuse blurs authorial boundaries – not just across time, through working with previous and future authors, but also across space, as more collaborative modes of practice question previously accepted notions of a single, autonomous author-architect.
The project’s three-part outcome comprises an open-access web platform www.adaptreuse.org, the main thesis publication and a handbook for practitioners.
The thesis represents a literary practice of adaptive reuse, a polyform and polyphonic exploration that embodies and performs the ideas it explores. Instead of attempting to develop a universal, fixed theoretical framework, the thesis takes a weak theory approach: it configures a collection of diverse fragments into an open, relational and generative constellation that accommodates rather than resolves difference. Bending time and space, this constellation challenges linear narratives to illuminate and reveal insights across disparate spacetimes.
Through a reparative reading of several key examples, the accompanying handbook offers students and practitioners a set of verbs or lemmas that can be conjugated differently according to the specific context or situation. These lemmas represent concrete, transformative actions that can be translated not only across different projects, but also different disciplines.
The critical contribution of the project lies in how it creates new possibilities for the wider discipline of architecture by expanding its existing vocabulary and concepts, offering alternative ways of viewing and engaging with the world, and therefore of constructing it.The members of the doctoral jury were Dr. Kate Briggs, Dr. Elke Couchez, Arch. Ing. Jan Haerens, Dr. Catalina Mejía Moreno, Prof. Dr. Kris Pint, Dr. Mia You
Making-with, Making-do: Constellations of Concepts and Practices around Adaptive Reuse
No full textEvery demolition is an act of violence with devastating ecological and cultural repercussions that reverberate for generations. Responding to a reality in which not just buildings but even entire communities are treated as disposable, this research supports and advances adaptive reuse as a more sustainable alternative to wasteful construction models based on demolition and reconstruction. To do so, it engages not only with the material, technical and economic aspects of reusing existing buildings, but also with the wider historical, political and socio-cultural contexts that influence and shape every architectural act.
Representing an exercise in sympoiesis or ‘making-with’, the project deliberately positions itself between practice and research. Through engaging in conversation with a range of practitioners and thinkers, it emphasises how adaptive reuse blurs authorial boundaries – not just across time, through working with previous and future authors, but also across space, as more collaborative modes of practice question previously accepted notions of a single, autonomous author-architect.
The project’s three-part outcome comprises an open-access web platform www.adaptreuse.org, the main thesis publication and a handbook for practitioners.
The thesis represents a literary practice of adaptive reuse, a polyform and polyphonic exploration that embodies and performs the ideas it explores. Instead of attempting to develop a universal, fixed theoretical framework, the thesis takes a weak theory approach: it configures a collection of diverse fragments into an open, relational and generative constellation that accommodates rather than resolves difference. Bending time and space, this constellation challenges linear narratives to illuminate and reveal insights across disparate spacetimes.
Through a reparative reading of several key examples, the accompanying handbook offers students and practitioners a set of verbs or lemmas that can be conjugated differently according to the specific context or situation. These lemmas represent concrete, transformative actions that can be translated not only across different projects, but also different disciplines.
The critical contribution of the project lies in how it creates new possibilities for the wider discipline of architecture by expanding its existing vocabulary and concepts, offering alternative ways of viewing and engaging with the world, and therefore of constructing it.The members of the doctoral jury were Dr. Kate Briggs, Dr. Elke Couchez, Arch. Ing. Jan Haerens, Dr. Catalina Mejía Moreno, Prof. Dr. Kris Pint, Dr. Mia You
joshspeagle/dynesty: v2.1.4
No full textThis is bug-fix release. The main user-visible changes is that npdim= option of dynesty is removed. Also because of the code change, you will not be able to resume previous dynesty runs from earlier (Sergey Koposov, Josh Speagle, Kyle Barbary, Gregory Ashton, Ed Bennett, Johannes Buchner, Carl Scheffler, Ben Cook, Colm Talbot, James Guillochon, Patricio Cubillos, Andrés Asensio Ramos, Matthieu Dartiailh, Ilya, Erik Tollerud, Dustin Lang, Ben Johnson, jtmendel, Edward Higson, … Danny Goldstein. (2024). joshspeagle/dynesty: v2.1.4 (v2.1.4). Zenodo. https://doi.org/10.5281/zenodo.1253746
Silence and Familial Homophobia in Colm Tóibín’s “Entiendes” and “One Minus One”
No full textThe present study focuses on two of Colm Tóibín’s gay short-stories – “Entiendes” (1993) and “One Minus One” (2010) – in which the homosexual son meditates on his attachment to the dead mother. In both texts, Tóibín characterises the mother-son bond as being fraught with silence, resentment and lack of communication. In “One Minus One” and “Entiendes”, the son’s closeted homosexuality coexists with familial legacies of shame, uneasiness and duplicity. The central characters in the two texts are similar, as they experience the same type of existential exile, solitude and alienation derived from their complex attachments to home and family. As shall be explained, the author dwells on the damaging effects of familial homophobia, highlighting the limitations of the dominant heteronormative family model to accommodate gay sensibilities
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