Results 11 to 20 of about 2,376 (273)

Machine learning for observational cosmology

Reports on Progress in Physics, 2023
Abstract An array of large observational programs using ground-based and space-borne telescopes is planned in the next decade. The forthcoming wide-field sky surveys are expected to deliver a sheer volume of data exceeding an exabyte.
Kana Moriwaki, Takahiro Nishimichi, Naoki Yoshida   +2 more
openaire   +3 more sources

Highly Accreting Supermassive Black Holes as Eddington Standard Candles

Physical Sciences Forum, 2023
Supermassive black holes accreting matter at very high, perhaps even super-Eddington rates appear in the sky as a special class of luminous active galactic nuclei.
Paola Marziani
doaj   +1 more source

Cosmological observations in non-local F(R) cosmology [PDF]

Astrophysics and Space Science, 2011
12 pages, 7 figures, will be published in Astrophysics and space ...
Farajollahi, H., Tayebi, F., Milani, F., Enayati, M.   +3 more
openaire   +3 more sources

Observational Cosmology with Artificial Neural Networks

Universe, 2022
In cosmology, the analysis of observational evidence is very important when testing theoretical models of the Universe. Artificial neural networks are powerful and versatile computational tools for data modelling and have recently been considered in the ...
Juan de Dios Rojas Olvera, Isidro Gómez-Vargas, Jose Alberto Vázquez   +2 more
doaj   +1 more source

Temporal and Spectral Variability of OJ 287 before the April–June 2020 Outburst

Galaxies, 2020
We present the results of a temporal and spectral study of the BL Lacertae object OJ 287 in optical, UV, and X-ray bands with observations performed by Swift satellite during September 2019–March 2020.
Nibedita Kalita, Alok C. Gupta, Minfeng Gu   +2 more
doaj   +1 more source

Predicting cosmological observables with PyCosmo

Astronomy and Computing, 2021
Astronomy and Computing ...
F. Tarsitano, U. Schmitt, A. Refregier, J. Fluri, R. Sgier, A. Nicola, J. Herbel, A. Amara, T. Kacprzak, L. Heisenberg   +9 more
openaire   +3 more sources

Cross-correlating Dark Sirens and Galaxies: Constraints on H 0 from GWTC-3 of LIGO–Virgo–KAGRA

The Astrophysical Journal
We apply the cross-correlation technique to infer the Hubble constant ( H _0 ) of the Universe using gravitational-wave (GW) sources without electromagnetic counterparts (dark sirens) from the third GW Transient Catalog (GWTC-3) and the photometric ...
Suvodip Mukherjee, Alex Krolewski, Benjamin D. Wandelt, Joseph Silk   +3 more
doaj   +1 more source

Transient Antiskyrmion‐Mediated Topological Transitions in Isotropic Magnets

Advanced Science, EarlyView.
A transient antiskyrmion‐mediated pathway that drives repeated stripe‐to‐skyrmion transitions is revealed, producing a net increase in topological charge in isotropic Dzyaloshinskii–Moriya interaction films. Experiments and simulations identify the antiskyrmion as a metastable excitation, enabling stochastic bitstream generation for probabilistic ...
Bingqian Dai, Tianyi Wang, Albert Lee, Shijie Xu, Zhongjian Bian, Xinyue Zhu, Puyang Huang, Aadi Chaturvedi, Yaochen Li, Yang Cheng, Qingyuan Shu, Haoran He, Hanshen Huang, Lixuan Tai, Kin Wong, Jinbo Yang, Anjan Soumyanarayanan, Zhaochu Luo, Kang L. Wang   +18 more
wiley   +1 more source

“Observables” in causal set cosmology [PDF]

Physical Review D, 2003
LaTeX, 1+19 pages, 2 ...
Brightwell, Graham, Dowker, H. Fay, Garcia, Raquel S., Henson, Joe, Sorkin, Rafael D.   +4 more
openaire   +2 more sources

‘Turkeys Cannot Vote for Christmas’: Why Epistemic Disobedience in an Anti‐Black World Matters

Australian Journal of Social Issues, EarlyView.
ABSTRACT Never in the history of global coloniality has the idea of epistemic disobedience been as important as in the 21st century. This is not only because the struggle for decolonisation has shifted from physical confrontation between the coloniser and the colonised into a battle of ideas but also because the former has deployed the idea of ...
Morgan Ndlovu
wiley   +1 more source