Results 81 to 90 of about 2,376 (273)
Constraints on Coasting Cosmological Models from Gravitational-wave Standard Sirens
The Astrophysical JournalWe present the first test of coasting cosmological models with gravitational-wave (GW) standard sirens observed in the first three observing runs of the LIGO–Virgo–KAGRA detector network. We apply the statistical galaxy catalog method adapted to coasting
Peter Raffai +3 more
doaj +1 more source
Observational Constraints on Cosmological Superstrings
Theoretical Physics, 2017 From theoretical point of view and not being in contradiction with current observational data, the cosmic strings should have fundamentally different origin and are characterized by wide range of energies. The paper is devoted to search for possible cosmological observational tests on superstring theory, among them to identification of observational ...
Sazhina, Olga S., Mukhaeva, Alfiia I.
openaire +2 more sources
Meteoritics &Planetary Science, EarlyView.Abstract The majority of planetary impacts occur at oblique angles. Impact structures on Earth are commonly eroded or buried, rendering the identification of the direction and angle of impact—using methods such as asymmetries in ejecta distribution, surface topographic expression, central uplift structure, and geophysical anomalies—challenging. In this
Eloise E. Matthews +5 more
wiley +1 more source
On the Number of Galaxies at High Redshift
Galaxies, 2015 The number of galaxies at a given flux as a function of the redshift, z, is derived when the z-distance relation is non-standard. In order to compare different models, the same formalism is also applied to the standard cosmology.
Lorenzo Zaninetti
doaj +1 more source
Dark energy and dark matter unification from dynamical space time: observational constraints and cosmological implications [PDF]
, 2019 Fotios K. Anagnostopoulos +3 more
openalex +1 more source
Observational Constraints on Loop Quantum Cosmology
Physical Review Letters, 2011 In the inflationary scenario of loop quantum cosmology in the presence of inverse-volume corrections, we give analytic formulas for the power spectra of scalar and tensor perturbations convenient to compare with observations. Since inverse-volume corrections can provide strong contributions to the running spectral indices, inclusion of terms higher ...
Bojowald, M. +2 more
openaire +5 more sources
Vertical profiling of shock attenuation at the Rochechouart impact structure, France
Meteoritics &Planetary Science, EarlyView.Abstract Rochechouart, south‐west France, is a complex impact structure. Here, we present the first report of shock barometry of quartz from what are likely parautochthonous basement units at depth, based on samples from the 2017 C.I.R.I.R drilling campaign. The crystallographic orientations of 725 sets of PDFs in 512 quartz grains in samples from four
P. Struzynska +4 more
wiley +1 more source
Piotr Flin (1945–2018) – In Memoriam (in Polish)
Studia Historiae Scientiarum, 2018 In this note we present brief curriculum vitae and scientific achievements of the recently deceased astronomer Piotr Flin.
Krzysztof Maślanka
doaj +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract The Campo del Cielo iron meteorite (IAB‐MG) provides a unique window into early solar system processes, particularly the formation and evolution of carbon phases in non‐magmatic iron meteorites. In this study, we conducted a systematic nanostructural investigation of three distinct graphite occurrences—cliftonite (type I), interstitial ...
Xiao Tian Deng +8 more
wiley +1 more source
Wstęp do bayesowskiej metodologii współczesnej kosmologii
Zagadnienia Filozoficzne w Nauce, 2009 The Bayesian framework is used in reconstruction of modern cosmology which actually concentrates on estimation of model parameters. The authors demonstrate that observational cosmology should be treated as an effective theory of the Universe. It realizes
Aleksandra Kurek +3 more
doaj