Results 11 to 20 of about 12,766 (215)
Scalar Field Evolution at Background and Perturbation Levels for a Broad Class of Potentials
Fortschritte der Physik, Volume 71, Issue 10-11, November 2023., 2023 Abstract In this paper, a non‐interacting scalar field cosmology with an arbitrary potential using the f‐deviser method that relies on the differentiability properties of the potential is investigated. Using this alternative mathematical approach, a unified dynamical system analysis at a scalar field's background and perturbation levels with arbitrary ...
Genly Leon +5 more
wiley +1 more source
Effect of the metallicity of the intergalactic medium in the Lyman‐α forest correlation function
Astronomische Nachrichten, Volume 344, Issue 1-2, January-February 2023., 2023 Abstract The Lyman‐α (Lyα) forest allows to constraint cosmological parameters at redshifts above 1.8$$ 1.8 $$ using the technique of standard rulers determined by baryon acoustic oscillations. This makes it an important tracer for the study of the universe at high redshift.
Andrea Muñoz‐Gutiérrez +1 more
wiley +1 more source
Theoretical and Experimental Challenges in the Measurement of Neutrino Mass
Advances in High Energy Physics, Volume 2023, Issue 1, 2023., 2023 Neutrino masses are yet unknown. We discuss the present state of effective electron antineutrino mass from β decay experiments; effective Majorana neutrino mass from neutrinoless double‐beta decay experiments; neutrino mass squared differences from neutrino oscillation: solar, atmospheric, reactor, and accelerator‐based experiments; sum of neutrino ...
Jyotsna Singh +2 more
wiley +1 more source
Mit eROSITA und eBOSS auf der Jagd nach Dunkler Materie und Energie
Physik in unserer Zeit, Volume 53, Issue 2, Page 64-71, March 2022., 2022 Das Röntgenteleskop eROSITA auf der russisch‐deutschen Weltraummission SRG ist seit seinem Start im Juli 2019 extrem erfolgreich in der Kartographierung des Röntgenhimmels. In Kombination mit SDSS, einem optischen Teleskop in New Mexico, USA, kann man die Entwicklung der Materieverteilung im Universum mit hoher Präzision und über einen Zeitraum von ...
Johan Comparat, Peter Predehl
wiley +1 more source
Progress and Challenges in Electromechanical Coupling of Radio Telescopes
International Journal of Antennas and Propagation, Volume 2022, Issue 1, 2022., 2022 Radio astronomy is a discipline of dynamics and wonders. The vast universe has many secrets to unravel. As one of the important facilities in this discipline, radio telescopes play a key role in collecting astronomical data and unraveling mysteries.
Yuefei Yan +10 more
wiley +1 more source
Phenomenology of Trimaximal Mixing with One Texture Equality
Advances in High Energy Physics, Volume 2022, Issue 1, 2022., 2022 We study neutrino mass matrices with one texture equality and the neutrino mixing matrix having either its first (TM1) or second (TM2) column identical to that of the tribimaximal mixing matrix. We found that out of total fifteen possible neutrino mass matrices with one texture equality, only six textures are compatible with TM1 mixing and six textures
S. Dev, Desh Raj, Omar G. Miranda
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Model-independent traversable wormholes from baryon acoustic oscillations
, 2023 In this paper, we investigate the model-independent traversable wormholes from baryon acoustic oscillations. Firstly, we place the statistical constraints on the average dark energy equation of state $\omega_{av}$ by only using BAO data.
Wang, Deng
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Small Scale Cosmological Perturbations: An Analytic Approach [PDF]
, 1995 Through analytic techniques verified by numerical calculations, we establish general relations between the matter and cosmic microwave background (CMB) power spectra and their dependence on cosmological parameters on small scales. Fluctuations in the CMB,
Hu, Wayne, Sugiyama, Naoshi
core +2 more sources
The Physics of Microwave Background Anisotropies [PDF]
, 1995 Cosmic microwave background anisotropies provide a vast amount of information on both structure formation in the universe and the background dynamics and geometry.
Hu, Wayne +2 more
core +3 more sources
Bianchi Type‐I Bulk Viscosity with a DE Cosmological Model
Advances in High Energy Physics, Volume 2020, Issue 1, 2020., 2020 The finding article presents Bianchi type‐I universe in the presence of bulk viscous and DE fluid nature of a cosmological model. The solutions of field equations were obtained by assuming hybrid expansion law. The physical significance of the obtained findings illustrates the dominance of bulk viscosity in early and dominance of dark energy fluid ...
Daba Meshesha Gusu, Saibal Ray
wiley +1 more source