Results 181 to 190 of about 786,932 (316)

Gravitational lensing phenomena of Ellis-Bronnikov-Morris-Thorne wormhole with global monopole and cosmic string

Physics Letters B
In this paper, we theoretically investigate gravitational lensing within the space-time framework of traversable wormholes, focusing on the combined effects of a global monopole and a cosmic string.
Faizuddin Ahmed, İzzet Sakallı, Ahmad Al-Badawi   +2 more
doaj  

Strong gravitational lensing by $$Sgr A^*$$ S g r A ∗ and $$M87^*$$ M 87 ∗ black holes embedded in dark matter halo exhibiting string cloud and quintessential field

European Physical Journal C: Particles and Fields
We investigate the strong gravitational lensing phenomena caused by a black hole with a dark matter halo in the presence of cloud string and quintessence.
Niyaz Uddin Molla, Himanshu Chaudhary, G. Mustafa, Farruh Atamurotov, Ujjal Debnath, Dhruv Arora   +5 more
doaj   +1 more source

Weak gravitational lensing

, 2013
Lecture given as part of the International School of Physics Enrico Fermi "New Horizons for Observational Cosmology", Varenna, July 1-6, 2013, eds. A. Melchiori, A. Cooray, E.
openaire   +3 more sources

How Early Trauma Shapes CEO Risk Appetite for Public Debt Versus Bank Debt

Financial Review, EarlyView.
ABSTRACT This study examines the impact of CEOs’ early disaster experiences on the choice of debt structure. We find that firms led by CEOs who have endured disasters are more inclined to shift from bank debt to public debt. This evidence remains robust across various alternative measures, empirical specifications, and identification tests aimed at ...
Houjian Li, Yiwei Li, Wei Song, Thanos Verousis, Haolan Yang   +4 more
wiley   +1 more source

Is the Flat Spectrum Double 1830-211 a Result of Gravitational Lensing? [PDF]

, 1989
G. A. Swarup, R. Subrahmanyan, D. Narasimha, A. Pramesh Rao   +3 more
openalex   +1 more source

Forecasting the Detection of Lyman-alpha Forest Weak Lensing from the Dark Energy Spectroscopic Instrument and Other Future Surveys

The Open Journal of Astrophysics
The apparent angular positions of quasars are deflected on the sky by the gravitational field sourced by foreground matter. This weak lensing effect is measurable through the distortions it introduces in the lensed quasar spectra.
Patrick Shaw, Rupert A. C. Croft, R. Benton Metcalf   +2 more
doaj   +1 more source

Navigating the Uncertainties of Post‐disruption Dynamics in Discourse: A Case Study of the EU–UK Security Relationship After Brexit

JCMS: Journal of Common Market Studies, EarlyView.
Abstract The article presents a model that conceptualizes the discursive construction of post‐disruption dynamics endorsed and reproduced by the affected parties and its potential to (not) contribute to future co‐operation. Conceiving of Brexit as a prime case of a broader phenomenon of post‐disruption contexts, this paper applies this model to the ...
Monika Brusenbauch Meislová
wiley   +1 more source

Diffraction in gravitational lensing for compact objects of low mass

, 1986
Shuji Deguchi, W. D. Watson
openalex   +1 more source

A novel gravitational lensing feature by wormholes

Physics Letters B, 2019
Horizonless compact objects with light rings (or photon spheres) are becoming increasingly popular in recent years for several reasons. In this paper, we show that a horizonless object such as a wormhole of Morris–Thorne type can have two photon spheres.
Rajibul Shaikh, Pritam Banerjee, Suvankar Paul, Tapobrata Sarkar   +3 more
doaj  

Weak Gravitational Lensing

, 2006
180 pages, 57 figures, to appear in: Kochanek, C.S., Schneider, P., Wambsganss, J.: Gravitational Lensing: Strong, Weak & Micro. Lecture Notes of the 33rd Saas-Fee Advanced Course, G. Meylan, P. Jetzer & P.
openaire   +2 more sources