Results 91 to 100 of about 186,042 (191)

Dynamical Systematics for Time-delay Lenses and the Impact on the Hubble Constant

The Astrophysical Journal
While time-delay lenses can independently probe H _0 , the estimates are degenerate with the convergence of the lens near the Einstein radius. Velocity dispersions, σ , can be used to break the degeneracy, with uncertainties Δ H / H _0  ∝ Δ σ ^2 / σ ^2 ...
R. Forés-Toribio, C. S. Kochanek, J. A. Muñoz   +2 more
doaj   +1 more source

Using Convolutional Neural Networks to Search for Strongly Lensed Quasars in KiDS DR5

The Astrophysical Journal
Gravitationally strongly lensed quasars (SL-QSO) offer invaluable insights into cosmological and astrophysical phenomena. With the data from ongoing and next-generation surveys, thousands of SL-QSO systems can be discovered expectedly, leading to ...
Zizhao He, Rui Li, Yiping Shu, Crescenzo Tortora, Xinzhong Er, Raoul Cañameras, Stefan Schuldt, Nicola R. Napolitano, Bharath Chowdhary N, Qihang Chen, Nan Li, Haicheng Feng, Limeng Deng, Guoliang Li, L. V. E. Koopmans, Andrej Dvornik   +15 more
doaj   +1 more source

Evidence for Substructure on the Inner Broad Line Region of the Lensed Quasar SDSS J1004+4112 from the Recurrence of Microlensing in the C IV Emission Line

The Astrophysical Journal
We use microlensing to probe the inner broad line region (BLR) of the lensed quasar SDSS J1004+4112, finding evidence of substructure. We study the recurrent microlensing events observed in the blue wing of the C IV emission line in image A of this ...
E. Mediavilla, J. Jiménez-Vicente, C. Fian, D. Chelouche, J. A. Muñoz, Raquel Forés-Toribio, S. Kaspi, G. R. Richards, P. Gómez-Álvarez   +8 more
doaj   +1 more source

Probing effective field theory corrections with quasinormal modes and gravitational lensing in Reissner–Nordström black holes

European Physical Journal C: Particles and Fields
Effective field theory (EFT) provides a systematic framework for parametrizing possible higher-energy corrections to general relativity through higher-curvature interactions.
Takamasa Kanai
doaj   +1 more source

Gravitational Lensing Effect on Cosmic Microwave Background

, 2007
Matter distribution in the Universe can cause the gravitational lensing effect, which would contaminate the cosmic microwave background (CMB) pattern we have observed today.
Wang, Fu-Cheng, 王富正
core  

Early Warning for Lensed Gravitational Wave Counterparts from Time Delays of Their Host Galaxies Observed in the Optical

The Astrophysical Journal
Gravitational lensing of gravitational waves can be leveraged to provide early-warning times of ${ \mathcal O }({\rm{hours}})$ to ${ \mathcal O }({\rm{days}})$ before the merger of binary neutron stars (BNSs) and neutron star black holes (NSBHs). This in
Sourabh Magare, Anupreeta More, Shasvath J. Kapadia   +2 more
doaj   +1 more source

Gravitational Lensing: Einstein's Unfinished Symphony (Free Astronomy Public Lectures)

, 2010
In 1919, Arthur Eddington demonstrated Einsteins's prediction that the Sun's gravity deflects the path of light rays. This phenomonon, termed 'gravitational lensing' is now one of the most powerful tools of the modern astronomer.
Professor Richard Ellis
core   +1 more source

Weak Gravitational Lensing and Cosmology [PDF]

, 2017
Albert Einstein’s General Theory of Relativity radically transformed our understanding of gravitation. Along with this transformative view came several powerful predictions.
Gibson, Clint
core  

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

Spacetime perspective of gravitational lensing in perturbed cosmologies. [PDF]

Sci Rep
Kling TP, Pooler SM.
europepmc   +1 more source