Results 31 to 40 of about 727,398 (339)
Book culture and education in Early Byzantium (4th — 7th centuries CE): Asia Minor
Материалы по археологии и истории античного и средневекового Причерноморья, 2021 The paper considers the role of book culture, the state and evolution of education in the Eastern Mediterranean of the early Byzantine time (4th — 7th centuries) in the context of the cultural continuity between Antiquity and the Middle Ages, using the ...
Denisova, I.V.
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Structure of the Baryon Halo Around a Supermassive Primordial Black Hole
ParticlesAccording to some theoretical models, primordial black holes with masses of more than 108 solar masses could be born in the early universe, and their possible observational manifestations have been investigated in a number of works. Dense dark matter and
Boris Murygin +2 more
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Particle decays during the cosmic dark ages [PDF]
, 2003 We consider particle decays during the cosmic dark ages with two aims: (1) to explain the high optical depth reported by the Wilkinson Microwave Anisotropy Probe (WMAP), and (2) to provide new constraints to the parameter space for decaying particles. We
Chen, Xuelei, Kamionkowski, Marc
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, 2004 The currently available values and confidence limits for Omega_m0, H_0 and globular cluster ages still indicate that the dark energy that dominates the Universe could also be a form of quintessence or phantom energy.
Aurich +32 more
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Constraints on holographic dark energy models using the differential ages of passively evolving galaxies [PDF]
, 2007 Using the absolute ages of passively evolving galaxies observed at different redshifts, one can obtain the differential ages, the derivative of redshift $z$ with respect to the cosmic time $t$ (i.e. ${\rm d} z/{\rm d}t$). Thus, the Hubble parameter $H(z)$
Abraham R. G. +6 more
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GUY HALSALL, WORLDS OF ARTHUR. FACTS AND FICTIONS OF THE DARK AGES
Journal of Ancient History and Archaeology, 2015 Guy Halsall, Worlds of Arthur. Facts and Fictions of the Dark Ages, Oxford: University Press, 2014. 384 pp.
Vlad Andrei Lazarescu
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Vision Research, 1999 Older adults have serious difficulty seeing under low illumination and at night, even in the absence of ocular disease. Optical changes in the aged eye, such as pupillary miosis and increased lens density, cannot account for the severity of this problem, and little is known about its neural basis.
Jackson, Gregory R. +2 more
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A smoother end to the dark ages
, 2011 Independent lines of evidence suggest that the first stars, which ended the cosmic dark ages, came in pairs, rather than singly. This could change the prevailing view that the early Universe had a Swiss-cheese-like appearance.Comment: Nature News and ...
A Stacy +15 more
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21-cm observations and warm dark matter models [PDF]
, 2019 Observations of the redshifted 21-cm signal (in absorption or emission) allow us to peek into the epoch of "dark ages" and the onset of reionization. These data can provide a novel way to learn about the nature of dark matter, in particular about the ...
Boyarsky, Alexey +4 more
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Dark energy gravitational wave observations and ice age periodicity
Physics Letters B, 2020 Dark Energy is the dominant component of the energy density of the Universe. However, it is also very elusive since its interaction with the rest of the Universe is primarily gravitational.
Anupam Singh
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