Results 91 to 100 of about 71,531 (348)

LenNet: direct detection and localization of strong gravitational lenses in wide-field sky survey images

Frontiers in Astronomy and Space Sciences
Strong gravitational lenses are invaluable for tackling fundamental astrophysics questions, such as the nature of dark matter and cosmic expansion.
Pufan Liu, Pufan Liu, Hui Li, Ziqi Li, Ziqi Li, Xiaoyue Cao, Xiaoyue Cao, Xiaoyue Cao, Rui Li, Hao Su, Ran Li, Nicola R. Napolitano, Léon V. E. Koopmans, Valerio Busillo, Crescenzo Tortora, Liang Gao, Liang Gao   +16 more
doaj   +1 more source

Primordial black hole detection through diffractive microlensing

, 2018
Recent observations of gravitational waves motivate investigations for the existence of Primordial Black Holes (PBHs). We propose the observation of gravitational microlensing of distant quasars for the range of infrared to the submillimeter wavelengths ...
Mehrabi, A., Naderi, T., Rahvar, S.
core   +1 more source

Sequelae of child maltreatment: Umbrella synthesis of 148 meta‐analyses on the mental health correlates

JCPP Advances, EarlyView.
Our umbrella synthesis found strong, often equivalent, associations between child maltreatment and all examined mental health difficulties. Different types of maltreatment appear to have comparably negative effects on mental health. If replicated, these findings may cause us to reconsider conventional wisdom that suggests some forms of CM are less ...
Barry Coughlan, Robbie Duschinsky, Marian J. Bakermans‐Kranenburg, Lianne Bakkum, Guy C. M. Skinner, Alfred Markham, Helen Beckwith, Marinus H. van Ijzendoorn   +7 more
wiley   +1 more source

Velocity effects on second order contributions to gravitational frequency shift by a moving Kerr–Newman black hole

European Physical Journal C: Particles and Fields, 2019
The significance of the radial velocity effects on the leading-order gravitational frequency shift in some special cases was reported recently. This paper investigates the gravitational shift of frequency of light propagating in the equatorial plane of a
Guansheng He, Chaohong Pan, Wenbin Lin
doaj   +1 more source

Gravitational lens theory

Eos, Transactions American Geophysical Union, 1980
‘… imagine an observer, an isolated galaxy acting as a lens, and a quasar, nearly in a line. Two images would be formed on either side of the lens, and a third one would be formed near the center of the galaxy because the bending for central rays will be small.’ [Jerome Christian, in Physics Today, September 1980.
openaire   +1 more source

Executive Function and Entrepreneurial Opportunity Exploitation Under Risk and Uncertainty

Strategic Change, EarlyView.
ABSTRACT This study examines how executive functions shape entrepreneurial opportunity exploitation under different knowledge environments. Drawing on Knight's distinction between risk and uncertainty, we conducted a vignette experiment with 200 working adults.
Ipek Koparan, Gorkem Aksaray, Tatiana Manolova, Linda Edelman   +3 more
wiley   +1 more source

Navigating the Twin Transformation: How Digitalization and Sustainability Shape the Future

Strategic Change, EarlyView.
ABSTRACT Amid growing societal and scholarly interest in the interplay between sustainability transformation (ST) and digital transformation (DT), this study conducts a systematic literature review to advance the understanding of twin transformation (TT). Analyzing 65 peer‐reviewed articles, this review makes three key contributions: (1) It synthesizes
Jonas Hammerschmidt, Janina Burtscher, Johanna Gast, Sascha Kraus, Kaisu Puumalainen   +4 more
wiley   +1 more source

A New Way to Discover Strong Gravitational Lenses: Pairwise Spectroscopic Search from DESI DR1

The Astrophysical Journal Supplement Series
We present a new method to search for strong gravitational-lensing systems by pairing spectra that are close together on the sky in a spectroscopic survey. We visually inspect 26,621 spectra in the Dark Energy Spectroscopic Instrument (DESI) Data Release
Yuan-Ming Hsu, Xiaosheng Huang, Christopher J. Storfer, Jose Carlos Inchausti, David Schlegel, John Moustakas, J. Aguilar, S. Ahlen, A. Anand, S. Bailey, D. Bianchi, D. Brooks, F. J. Castander, T. Claybaugh, A. Cuceu, A. de la Macorra, J. Della Costa, Arjun Dey, Biprateep Dey, P. Doel, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, D. Huterer, R. Joyce, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, O. Lahav, M. Landriau, L. Le Guillou, M. Manera, A. Meisner, R. Miquel, S. Nadathur, N. Palanque-Delabrouille, W. J. Percival, F. Prada, I. Pérez-Ràfols, G. Rossi, E. Sanchez, M. Schubnell, J. Silber, D. Sprayberry, G. Tarlé, B. A. Weaver, R. Zhou, H. Zou, (DESI Collaboration)   +50 more
doaj   +1 more source

Perturbative reconstruction of a gravitational lens: when mass does not follow light

, 2009
The structure and potential of a complex gravitational lens is reconstructed using the perturbative method presented in Alard 2007, MNRAS, 382L, 58; Alard 2008, MNRAS, 388, 375. This lens is composed of 6 galaxies belonging to a small group.
Alard, Alard, Alard, Blandford, Brewer, C. Alard, Cabanac, Clowe, Diego, Evans, Grossman, Kochanek, Krist, Lynds, Nelder, Paczynski, Peirani, Saha, Suyu, Suyu, Trotter, Vegetti, Wallington, Warren, Wayth, Wucknitz   +25 more
core   +2 more sources

Intuition–Driven Prospection and Uncertainty Misalignment: Sources of Entrepreneurial Agency Problems in Ventures

Strategic Change, EarlyView.
ABSTRACT Start‐up CEOs are usually more aligned with the interests of the venture board compared to CEOs in legacy firms, and therefore it is usual to conclude that the traditional agency problem is lower in ventures. In this article, it is argued that this is only half of the story, and that the agency problem is reversed in early ventures such that ...
Glenn Kristiansen
wiley   +1 more source