Results 91 to 100 of about 196,671 (220)

A theoretical prediction for the dipole in nearby distances using cosmography

The Open Journal of Astrophysics
Cosmography is a widely applied method to infer kinematics of the Universe at small cosmological scales while remaining agnostic about the theory of gravity at play.
Hayley J Macpherson, Asta Heinesen
doaj   +1 more source

Spinning Systems in Quantum Mechanics: An Overview and New Trends

Universe
The study of spinning systems plays a question of interest in several research branches in physics. It allows the understanding of simple classical mechanical systems but also provides us with tools to investigate a wide range of phenomena, from ...
E. Brito, Júlio E. Brandão, Márcio M. Cunha   +2 more
doaj   +1 more source

New accelerating cosmology without dark energy: the particle creation approach and the reduced relativistic gas

European Physical Journal C: Particles and Fields
The standard procedure to explain the accelerated expansion of the Universe is to assume the existence of an exotic component with negative pressure, generically called dark energy.
P. W. R. Lima, J. A. S. Lima, J. F. Jesus   +2 more
doaj   +1 more source

Cosmological comoving behavior of the configurational entropy

Physics Letters B, 2019
It has been shown that a functional dependence of the configurational entropy (CE) density exhibits a cosmological comoving behavior related to the scale parameter, a, of the FRW flat universe.
A.E. Bernardini, R. da Rocha
doaj   +1 more source

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

The IXPE Science of Pulsars and Their Nebulae

Galaxies
Pulsars (PSRs) and Pulsar Wind Nebulae (PWNe) form some of the most interesting high-energy astrophysical systems. Their prominent synchrotron emission makes them ideal candidates for polarimetry.
Niccolò Bucciantini, Roger W. Romani, Fei Xie, Josephine Wong   +3 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

The Birth of the Universe

, 2015
Presented on April 7, 2015 at 6:00 p.m. in the Clough Undergraduate Learning Commons, room 144.George Efstathiou is the Professor of Astrophysics at the University of Cambridge.
Efstathiou, George
core   +1 more source