Results 11 to 20 of about 3,248,739 (364)
Interstellar extinction curve variations towards the inner Milky Way: a challenge to observational cosmology [PDF]
, 2015 We investigate interstellar extinction curve variations toward $\sim$4 deg$^{2}$ of the inner Milky Way in $VIJK_{s}$ photometry from the OGLE-III and $VVV$ surveys, with supporting evidence from diffuse interstellar bands and $F435W,F625W$ photometry ...
David M. Nataf +20 more
openalex +3 more sources
Observational exclusion of a consistent loop quantum cosmology scenario [PDF]
, 2016 It is often argued that inflation erases all the information about what took place before it started. Quantum gravity, relevant in the Planck era, seems therefore mostly impossible to probe with cosmological observations. In general, only very \textit{ad
Boris Bolliet +3 more
openalex +3 more sources
Supernovae - a tool for observational cosmology [PDF]
Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017), 2018 Type Ia Supernovae (SNe) are excellent distance indicators in the Universe. Observations of distant SNe~Ia led to the discovery of the accelerating expansion of the Universe. The most recent analysis of SNe Ia indicates that considering a flat $\Lambda$CDM cosmology, the contribution of dark energy in the total density of the Universe is $\sim$70 ...
M. V. Pruzhinskaya, P.-F. Léget
openalex +4 more sources
Black hole shadow with a cosmological constant for cosmological observers [PDF]
The European Physical Journal C, 2019 We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological constant changes the angular size of the black hole shadow for static observers. However, the shadow size must be calculated for the appropriate cosmological observes.
Firouzjaee, Javad, Allahyari, Alireza
arxiv +6 more sources
Confronting Lemaitre–Tolman–Bondi models with observational cosmology [PDF]
, 2008 The possibility that we live in a special place in the universe, close to the centre of a large void, seems an appealing alternative to the prevailing interpretation of the acceleration of the universe in terms of a ΛCDM model with a dominant dark energy
J. García-Bellido, Troels Haugbølle
openalex +3 more sources
Stability analysis and observational measurement in chameleonic generalised Brans-Dicke cosmology [PDF]
, 2011 We investigate the dynamics of the chameleonic Generalised Brans-Dicke model in flat FRW cosmology. In a new approach, a framework to study stability and attractor solutions in the phase space for the model is developed by simultaneously best fitting the
H. Farajollahi, Amin Salehi
openalex +3 more sources
Barrow Entropy Cosmology: an observational approach with a hint of stability analysis [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 In this work, we use an observational approach and dynamical system analysis to study the cosmological model recently proposed by Saridakis (2020), which is based on the modification of the entropy-area black hole relation proposed by Barrow (2020).
G. Leon +5 more
semanticscholar +1 more source
A new approach to observational cosmology using the scattering transform [PDF]
Monthly notices of the Royal Astronomical Society, 2020 Parameter estimation with non-Gaussian stochastic fields is a common challenge in astrophysics and cosmology. In this paper, we advocate performing this task using the scattering transform, a statistical tool sharing ideas with convolutional neural ...
Sihao Cheng (程思浩) +3 more
semanticscholar +1 more source
Multipole decomposition of the general luminosity distance Hubble law — a new framework for observational cosmology [PDF]
, 2020 We present the luminosity distance series expansion to third order in redshift for a general space-time with no assumption on the metric tensor or the field equations prescribing it.
A. Heinesen
semanticscholar +1 more source
Observations in quantum cosmology
Classical and Quantum Gravity, 2023 AbstractIn this review, we focus on whether a canonical quantization of general relativity can produce testable predictions for cosmology. In particular, we examine how this approach can be used to model the evolution of primordial perturbations.
Leonardo Chataignier +2 more
openaire +2 more sources