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We use perturbation theory in the strong-field regime to study the inspiral-to-plunge transition of a test particle into a Kerr black hole. We found a smooth transition, without burst, and with lower energy and angular momentum radiated in gravitational waves with respect to previous treatments in the literature. Besides their theoretical interest, our results are relevant for the waveform templates of binary black hole mergers used for gravitational waves detection which are constructed on the basis of a inspiral-to-plunge transition with a high energetic burst. 相似文献
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Astronomy Reports - Almost 50 years after “Introducing the Black Hole” [1], we are witnessing the clear evidence on the discovery of the moment of formation of the Black Hole in GRB... 相似文献
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César A. Zen Vasconcellos Dimiter Hadjimichef Magno Machado Benno Bodmann Marcelo Netz-Marzola Geovane Naysinger Mariana Vargas Magaña Peter O. Hess Horst Stöcker Steven Gullberg Remo Ruffini 《Astronomische Nachrichten》2024,345(2-3):e240029
We outline our experience in organizing the first edition of the Workshop on Matter, Astrophysics, Gravitation, Ions and Cosmology, held in virtual and in-person format, denominated MAGIC23, held from 6 to 10 March, 2023, in Praia do Rosa, Santa Catarina, Brazil. The event aimed to bring together leading academic scientists, professors, students, and research scholars for exchanging experiences and discuss the most recent innovations, trends, practical challenges, and experimental and theoretical solutions adopted in the investigation fields within the scope of the meeting. The workshop offered to the participants a platform for scientific and academic projects, partnerships, and presentation of high-quality research contributions describing original and unpublished results on topics related to matter, astrophysics, gravitation, ions, and cosmology. 相似文献
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Hydraulic and flood-loss modeling of levee,floodplain, and river management strategies,Middle Mississippi River,USA 总被引：4，自引：2，他引：2
In this investigation, four scenarios were used to quantify the balance between the benefits of levees for flood protection
and their potential to increase flood risk using Hazards U.S. Multi-Hazard flood-loss software and hydraulic modeling of the
Middle Mississippi River (MMR). The goals of this study were (1) to quantify the flood exposure under different flood-control
configurations and (2) to assess the relative contributions of various engineered structures and flood-loss strategies to
potential flood losses. Removing all the flood-control structures along the MMR, without buyouts or other mitigation, reduced
the average flood stages between 2.3 m (100-year flood) and 2.5 m (500-year), but increased the potential flood losses by
$4.3–6.7 billion. Removing the agricultural levees downstream of St. Louis decreased the flood stages through the metro region
by ~1.0 m for the 100- and 500-year events; flood losses, without buyouts or other mitigation, were increased by $4.3–6.7 billion. Removing the agricultural levees downstream of St. Louis decreased the flood stages through the metro region
by ~1.0 m for the 100- and 500-year events; flood losses, without buyouts or other mitigation, were increased by 155 million
for the 100-year flood, but were decreased by $109 million for the 500-year flood. Thus, agricultural levees along the MMR
protect against small- to medium-size floods (up to the ~100-year flood level) but cause more damage than they prevent during
large floods such as the 500-year flood. Buyout costs for the all the buildings within the 500-year floodplain downstream
of urban flood-control structures near St. Louis are ~40% less than the cost of repairing the buildings damaged by the 500-year
flood. This suggests large-scale buyouts could be the most cost-effective option for flood loss mitigation for properties
currently protected by agricultural levees. 相似文献
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Within the framework of a Gamow cosmology with massive neutrinos a scenario is proposed in which both galactic halos and globular clusters are formed due to the existence of a critical injection mass. Galactic halos are formed at red shift z10–100 by self-gravitating neutrinos, and globular clusters atz103 by a critical injection mass of primordial plasma (Gamow's Ylem). 相似文献
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R. Moradi R. Ruffini C. L. Bianco Y.-C. Chen M. Karlica J. D. Melon Fuksman D. Primorac J. A. Rueda S. Shakeri Y. Wang S. S. Xue 《Astronomy Reports》2018,62(12):905-910
In this work we study a role of baryon load and interstellarmediumdensity to explain the nature of peaks in the ultra-relativistic prompt emission (UPE) phase of Gamma-ray Bursts (GRBs). We study the behavior of their Γ Lorenz factor fromthe moment of transparency all the way up to interstellarmedium. We finally study the characteristic of equitemporal surfaces in the UPE phase. 相似文献
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Whole-rock geochemical analysis of metavolcanic and plutonic rocks from Mai Kenetal-Negash area, Tigrai, northern Ethiopia was carried out to evaluate their magma type and original tectonic environment. Their major element content has been modified by secondary alteration, and trace and rare-earth elements have been used to investigate their petrogenesis. The low content of compatible elements of the metavolcanic rocks and their relatively high content of incompatible elements and light REE point to a depleted source region, whereas the plutonic rocks show a more pronounced REE fractionation (LaN/LuN >4). Metavolcanic and plutonic rocks seem to be cogenetic. Discriminant diagrams suggest that the majority of the metavolcanic and all the plutonic rocks are members of a calc-alkaline suite developed in a volcanic arc setting. The overall geochemical characteristics of both sets of rocks are consistent with the arc accretion models postulated in Sudan, Egypt and Saudi Arabia for the Neoproterozoic evolution of the Arabian-Nubian Shield. 相似文献