Results 71 to 80 of about 881 (177)

On the emergence of the $$\mathbf{\Lambda }$$ Λ CDM model from self-interacting Brans–Dicke theory in $$\mathbf{d= 5}$$ d=5

European Physical Journal C: Particles and Fields, 2018
We investigate whether a self-interacting Brans–Dicke theory in $$d=5$$ d=5 without matter and with a time-dependent metric can describe, after dimensional reduction to $$d=4$$ d=4 , the FLRW model with accelerated expansion and non-relativistic matter ...
Luz Marina Reyes, Santiago Esteban Perez Bergliaffa   +1 more
doaj   +1 more source

On the Perturbed Friedmann Equations in Newtonian Gauge

Universe
Based on Newtonian mechanics, in this article, we present a heuristic derivation of the Friedmann equations, providing an intuitive foundation for these fundamental relations in cosmology.
Jaume de Haro, Emilio Elizalde, Supriya Pan   +2 more
doaj   +1 more source

The kinematic cosmic dipole beyond Ellis and Baldwin

Astronomy & Astrophysics
The cosmic dipole anomaly–currently detected at a significance exceeding 5σ in several independent surveys poses a significant challenge to the standard model of cosmology.
Bonnefous Albert
doaj   +1 more source

Quantum Big-Bounce as a phenomenology of RQM in the Mini-superspace

Physics Letters B
We investigate the emergence of a quantum Big-Bounce in the context of an isotropic Universe, filled by a self-interacting scalar field, which plays the role of a physical clock. The bouncing cosmology is the result of a scattering process, driven by the
Simone Lo Franco, Giovanni Montani
doaj   +1 more source

CHEX-MATE: Relationship between X-ray and millimetre inferences of galaxy cluster temperature profiles

Astronomy & Astrophysics
Thermodynamic profiles from X-ray and millimetre observations of galaxy clusters are often compared under the simplifying assumptions of a smooth, spherically symmetric intracluster medium.
De Luca F., Bourdin H., Mazzotta P., Luzzi G., Campitiello M. G., De Petris M., Eckert D., Ettori S., Ferragamo A., Forman W., Gaspari M., Gastaldello F., Ghizzardi S., Gitti M., Kay S. T., Kim J., Lovisari L., Macías-Pérez J. F., Maughan B. J., Muñoz-Echeverría M., Oppizzi F., Pointecouteau E., Pratt G. W., Rasia E., Rossetti M., Saxena H., Sayers J., Sereno M.   +27 more
doaj   +1 more source

Transverse Velocities in Real-Time Cosmology: Position Drift in Relativistic N-Body Simulations

The Open Journal of Astrophysics
The era of real-time cosmology has begun. It is now possible to directly measure the apparent drift of high-redshift astronomical sources across the sky $\textit{in real time}$.
Alexander Oestreicher, Chris Clarkson, Julian Adamek, Sofie Marie Koksbang   +3 more
doaj   +1 more source

Little rip, pseudo rip and bounce cosmology with generalized equation of state in non-standard backgrounds

European Physical Journal C: Particles and Fields
The discovery of universe’s late-time acceleration and dark energy has overseen a great deal of research into cosmological singularities and particularly future singularities.
Oem Trivedi, Alexander V. Timoshkin
doaj   +1 more source

Matematyka i kosmologia

Zagadnienia Filozoficzne w Nauce, 2012
The mathematical and cosmological works of a group associated with the Copernicus Center for Interdisciplinary Studies in Cracow are summarized. The group consists mainly of M. Heller, L. Pysiak, W. Sasin, Z. Odrzygóźdź and J. Gruszczak.
Michał Heller
doaj  

The Rényi Entropy and Entropic Cosmology. [PDF]

Entropy (Basel)
Kruglov SI.
europepmc   +1 more source

Fractal nature of galaxy clustering in the updated CfA redshift catalog. [PDF]

Sci Rep
Macek WM, Wójcik D.
europepmc   +1 more source