5,847 research outputs found
Gravitational wave signals from long-lasting binary–single black hole encounters
No full textIn the dense regions of star clusters, close encounters with black holes (BHs) can occur giving rise to a new class of gravitational-wave (GW) signals. Binary–single encounters between three BHs are expected to dominate the rate of signals from unbound systems in the frequency band of terrestrial GW detectors. The encounter can describe a quasi-hyperbolic trajectory, which was the focus of a recent study. In some cases, the encounter can take a more complex form including one or two BH mergers as a result of the encounter, repeating cycles of close proximity between the BHs, and the exchange of a BH that is part of the binary. The variety of types of encounters leads to a variety of GW signals emerging from these encounters. Using the ARWV N-body code, we performed 42 numerical simulations, to explore various outcomes of binary–single interaction, and we characterize the diverse GW signatures produced during these encounters. Additionally, we evaluated the detectability of these GW signals by injecting them into the simulated noise of the Einstein Telescope and exploring different methods to detect the signals. Our findings shed light on the complexities of these interactions and their potential implications for GW astronomy
Gravitational wave signals from binary-single black hole encounters in star clusters
No full textStar clusters are the main dynamical formation channel for binary black holes (BBHs). In these dense environments, BBH mergers are driven by gravitational wave emission and binary-single encounters with other objects in the cluster. This work is focused on the gravitational wave (GW) signals emitted by close encounters between a BBH and an isolated black hole, highlighting the various outcomes that can arise from these interactions. To estimate the GW spectrum of these signals, numerical simulations are performed using the N-body code ARWV, with stellar mass black holes serving as input masses. Our study considers the potential for these burst signals to fall within the sensitivity band of current and future ground-based detectors, depending on the parameters involved
Encuentros con Elena Poniatowska
No full textThe author analyzes testimonial literature from the perspective of female literature through his meeting with Elena Poniatowska. An analysis of reality vs. Fiction in Elena, Jesusa and Tinisima.El autor analiza, desde su encuentro con Elena Poniatowska, la vertiente de la literatura testimonial como literatura de mujeres. Un análisis interior de la relación entre realidad y ficción, entre Elena, Jesusa o Tinísima
Bio-bibliografía de y sobre Elena Poniatowska Amor
No full textThe objective of this article is to collect and present: I. the chronology of the life and work of Elena Poniatowska; II. the complete works (as principal and secondary author), and III. the bibliography on the author (books, chapters, and articles).El objetivo de este artículo es reunir y presentar: I. los datos cronológicos fundamentales de la vida y la obra de Elena Poniatowska; II. El compendio de sus obras (como autora principal y como secundaria); y III. la bibliografía sobre la escritora (libros, capítulos de libros y artículos)
El Tlacuache Núm. 698 (2015). 698 Año 13 (2015) noviembre. El Tlacuache
No full textLa mujer vista por cronistas en tiempos novohispanos por Laura Elena Hinojosa. - El Códice Mauricio de la Arena forma parte de Los códices de Tlaquiltenango por Laura Elena Hinojosa
Study on the detectability of gravitational radiation from single-binary encounters between black holes in nuclear star clusters: The case of hyperbolic flybys
No full textWith the release of the third Gravitational-Wave Transient Catalogue (GWTC-3), 90 observations of compact-binary mergers by Virgo and LIGO detectors are confirmed. Some of these mergers are suspected to have occurred in star clusters. The density of black holes at the cores of these clusters is so high that mergers can occur through a few generations forming increasingly massive black holes. These conditions also make it possible for three black holes to interact, most likely via single-binary encounters. In this paper, we present a first study of how often such encounters can happen in nuclear star clusters (NSCs) as a function of redshift and whether these encounters are observable by gravitational-wave (GW) detectors. This study focuses on effectively hyperbolic encounters leaving out the resonant encounters. We find that in NSCs single-binary encounters occur rarely compared to binary mergers and that hyperbolic encounters most likely produce the strongest GW emission below the observation band of terrestrial GW detectors. While several of them can be expected to occur per year with peak energy in the LISA band, their amplitude is low, and detection by LISA seems improbable
Encounters with Elena Poniatowska
No full textEl autor analiza, desde su encuentro con Elena Poniatowska, la vertiente de la literatura testimonial como literatura de mujeres. Un análisis interior de la relación entre realidad y ficción, entre Elena, Jesusa o Tinísima.The author analyzes testimonial literature from the perspective of female literature through his meeting with Elena Poniatowska. An analysis of reality vs. Fiction in Elena, Jesusa and Tinisima
Was There a Quiet Revolution? Belarus After the 2006 Presidential Election
No full textThe 2006 presidential election in Belarus mobilized a large cross-section of society to protest against the Lukashenko regime. Although unprecedented, the mass mobilization was short-lived, failing to develop into another kind of coloured revolution in the region. The key to our understanding of the endurance of Lukashenko's regime seems to lie in its internal environment, and notably, in the seemingly contradictory feature of the Belarusian electorate. Not only do they fully identify with the president, thus effectively legitimizing his politics and policies; they also do so knowingly, through their strategic learning of how to survive and even thrive under Lukashenko's regime. This type of learning, however, may not necessarily lead to a critical reflection of the regime's malpractice, and thus is unlikely to challenge its foundations
From trans-disciplinary to "undisciplined" design learning: educating through/to disruption
No full textThe paper is fruit of a coordinated work, however the author of paragraphs 1 and 4 is Flaviano Celaschi, the author of paragraph 2 is Elena Formia and the author of paragraphs 3 and 5 is Eleonora Lup
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