Results 21 to 30 of about 116,847 (299)

The Dark Ages' 21-cm Trispectrum

, 2022
We investigate tomography of 21-cm brightness temperature fluctuations during the Dark Ages as a probe for constraining primordial non-Gaussianity. We expand the 21- cm brightness temperature up to cubic order in perturbation theory and improve previous ...
de Wild, Tim, Flöss, Thomas; id_orcid, Meerburg, P. Daniel, Wild, Tim de, Koopmans, Léon V. E., Flöss, Thomas, Meerburg, P. Daniel; id_orcid   +6 more
core   +1 more source

Breaking through the cosmic fog: JWST/NIRSpec constraints on ionizing photon escape in reionization-era galaxies

Astronomy & Astrophysics
Aims. The escape fraction of Lyman continuum photons (fesc(LyC)) is the last key unknown in our understanding of cosmic reionization. Directly estimating the escape fraction (fesc) of ionizing photons in the epoch of reionization (EoR) is impossible, due
Giovinazzo Emma, Oesch Pascal A., Weibel Andrea, Meyer Romain A., Witten Callum, Bhagwat Aniket, Brammer Gabriel, Chisholm John, de Graaff Anna, Gottumukkala Rashmi, Jecmen Michelle, Katz Harley, Leja Joel, Marques-Chaves Rui, Maseda Michael, Shivaei Irene, Trebitsch Maxime, Verhamme Anne   +17 more
doaj   +1 more source

Dark triad and cyber aggression among Chinese adolescents during COVID-19: A moderated mediation model

Frontiers in Psychology, 2022
During the COVID-19 pandemic, the use of online learning has become a necessary choice for students, and would increase the probability of cyber aggression (CA).
Zhen Zhang, Shengnan Bian, Hui Zhao, Chunhui Qi   +3 more
doaj   +1 more source

GLIMPSE-D: Metallicity decline in faint galaxies: Implications for [O III]+Hβ luminosity function and re-ionisation budget

Astronomy & Astrophysics
We report the measurement of the R3 = [O III] λ5008/Hβ ratios for 54 galaxies in the GLIMPSE-D survey. Thanks to gravitational lensing, our sample includes galaxies with −20 ≲ MUV 
Korber Damien, Schaerer Daniel, Marques-Chaves Rui, Adamo Angela, Basu Arghyadeep, Chisholm John, Dessauges-Zavadsky Miroslava, McQuinn Kristen. B. W., Saldana-Lopez Alberto, Atek Hakim, Endsley Ryan, Fujimoto Seiji, Furtak Lukas J., Kokorev Vasily, Naidu Rohan P., Pan Richard   +15 more
doaj   +1 more source

Searching for the dark force with 21-cm spectrum in light of EDGES

Physics Letters B, 2019
The EDGES Collaboration has recently announced the detection of the 21-cm spectrum with an absorption profile centred at 78 megahertz, of which the depth is deeper than that expected by the standard cosmological paradigm. To enrich the heating process of
Chunlong Li, Yi-Fu Cai
doaj   +1 more source

The Dark Age of the Universe

Science, 2003
The Dark Age is the period between the time when the cosmic microwave background was emitted and the time when the evolution of structure in the universe led to the gravitational collapse of objects, in which the first stars were formed. The period of reionization started with the ionizing light from the first stars, and it ended when all ...
openaire   +3 more sources

POLAR

Astronomy & Astrophysics
Context. Galaxies may suffer some starburst and quenched periods in their history due to galaxy mergers and feedback. However, semi-numerical simulations of the Epoch of Reionization (EoR) do not accurately model the effects of the star formation history
Ma Qing-Bo, Ghara Raghunath, Ciardi Benedetta, Acharya Anshuman, Yue Bin, Iliev Ilian T., Koopmans Léon V. E., Mellema Garrelt, Zaroubi Saleem   +8 more
doaj   +1 more source

Possible combinations of early and late time cosmologies through BAO scales

European Physical Journal C: Particles and Fields, 2023
The theoretical scenarios of early universe and late time accelerated expansion constitute an open problem in cosmology. Relative Baryon Acoustic Oscillation (BAO) scales measured by 6dFGS, $$\mathrm SDSS+2dFGRS$$ S D S S + 2 d F G R S , BOSS DR11 Ly ...
Sanjeev Kalita, Chayanika Rabha
doaj   +1 more source

The cosmic dark ages

, 2010
How did the elements come into existence, and how we can use them to count the number of stars in the early Universe? This talk will reveal the dark ages of the Universe.
Emma Ryan-Weber (18924055)
core   +1 more source

From mice to humans—divergent strategies for intestinal homeostasis and regeneration

FEBS Letters, EarlyView.
Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa, Shinya Sugimoto, Toshiro Sato   +2 more
wiley   +1 more source