Results 61 to 70 of about 63,611 (230)

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, EarlyView.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source

Lensing galaxies: light or dark? [PDF]

, 1998
In a recent paper, Hawkins (1997) argues on the basis of statistical studies of double-image gravitational lenses and lens candidates that a large population of dark lenses exists and that these outnumber galaxies with more normal mass-to-light ratios by
Browne, I. W. A., Fassnacht, C. D., Helbig, P., Jackson, N., Koopmans, L. V. E., Marlow, D. R., Wilkinson, P. N.   +6 more
core   +3 more sources

Youth activism in Poland: Perceptions, participation and diverging perspectives from young people and activists

British Educational Research Journal, EarlyView.
Abstract Recent years have seen a growing scholarly interest in youth activism (YA), a phenomenon often viewed as a positive development in response to declining civic and political engagement among young people. However, most of the research focuses on the activists themselves and gives less attention to how YA is perceived by the broader youth ...
Martyna Elerian, Miri Yemini, Katarzyna Jasikowska   +2 more
wiley   +1 more source

Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes

The Astrophysical Journal
A moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
doaj   +1 more source

‘Fish in simulated water’? A Bourdieusian analysis of Chinese doctoral students' learning experiences in Southeast Asian developing countries

British Educational Research Journal, EarlyView.
Abstract International student mobility (ISM) has historically followed a pattern of movement from developing regions to developed countries. However, in recent years, there has been a noticeable increase in the number of Chinese students pursuing doctoral studies in Southeast Asian developing countries, an area that has received relatively little ...
Yueyang Zheng, Kun Dai, Alan C. K. Cheung   +2 more
wiley   +1 more source

Gravitational lensing by a dark compact object in modified gravity and observational constraints from Einstein rings

European Physical Journal C: Particles and Fields
In this manuscript, we provide a comprehensive study of gravitational lensing by dark compact objects predicted by modified gravity (MOG) based on the scalar–vector–tensor action, with the aim of providing new insights into the nature of gravitational ...
Nagina Rehman, Zoe C. S. Chan, Mubasher Jamil, Mustapha Azreg-Aïnou   +3 more
doaj   +1 more source

Quasi-geometrical Optics Approximation in Gravitational Lensing

, 2004
The gravitational lensing of gravitational waves should be treated in the wave optics instead of the geometrical optics when the wave length $\lambda$ of the gravitational waves is larger than the Schwarzschild radius of the lens mass $M$.
Baraldo, Bartelmann, Bontz, De Paolis, De Paolis, Deguchi, Nakamura, Navarro, Ohanian, Peters, Press, R. Takahashi, Ruffa, Seto, Takahashi, Zakharov   +15 more
core   +1 more source

‘School is their whole world’: Teachers' perspectives on loneliness among children and adolescents from England and mainland China

British Educational Research Journal, EarlyView.
Abstract As front‐line observers and active participants in pupils' daily lives, teachers closely monitor pupils' social interactions, emotional states and behavioural changes. Their unique perspective enables them to detect problems in the social lives of their pupils that may not be immediately visible to peers, parents or mental health professionals.
Yixuan Zheng, Charlotte Bagnall, Caroline Bond, Elizabeth Birchinall, Pamela Qualter   +4 more
wiley   +1 more source

Inferring Properties of Dark Galactic Halos Using Strongly Lensed Gravitational Waves

The Astrophysical Journal
Gravitational waves (GWs) can be deflected, similarly to electromagnetic (EM) waves, by massive objects through the phenomenon of gravitational lensing .
Eungwang Seo, Tjonnie G. F. Li, Martin A. Hendry   +2 more
doaj   +1 more source

The spread of non‐native species

Biological Reviews, EarlyView.
ABSTRACT The global redistribution of species through human agency is one of the defining ecological signatures of the Anthropocene, with biological invasions reshaping biodiversity patterns, ecosystem processes and services, and species interactions globally.
Phillip J. Haubrock, Ali Serhan Tarkan, Irene Martín‐Forés, Stelios Katsanevakis, Ronaldo Sousa, Ismael Soto, Andy J. Green, Antonín Kouba, Teun Everts, Victoria Dominguez Almela, Nadège Belouard, Cang Hui, Jamie Bojko, Victor Deklerck, Margaux Boeraeve, Franz Essl, J. Robert Britton   +16 more
wiley   +1 more source