Results 11 to 20 of about 74,681 (258)

Type V singularities with inhomogeneous equations of state

Physics Letters B, 2022
Interest in cosmological singularities has remarkably grown in recent times, particularly on future singularities with the discovery of late-time acceleration of the universe and dark energy.
Oem Trivedi
doaj   +1 more source

Relativistic Fractional-Dimension Gravity

Universe, 2021
This paper presents a relativistic version of Newtonian Fractional-Dimension Gravity (NFDG), an alternative gravitational model recently introduced and based on the theory of fractional-dimension spaces.
Gabriele U. Varieschi
doaj   +1 more source

Cosmological analogies, Lagrangians, and symmetries for convective–radiative heat transfer

European Physical Journal C: Particles and Fields, 2020
A formal analogy between the Friedmann equation of relativistic cosmology and models of convective–radiative cooling/heating of a body (including Newton’s, Dulong–Petit’s, Newton–Stefan’s laws, and a generalization) is discussed.
Valerio Faraoni, Farah Atieh, Steve Dussault   +2 more
doaj   +1 more source

CHARLES SANDERS PEIRCE AND THE PLACE OF CHAOS IN THE NEW WORLD ORDER [PDF]

Filozofia i Nauka
This article examines the main ideas of the metaphysics of the prominent American logician and philosopher Charles Sanders Peirce. It is shown that a significant part of his „scientific metaphysics” is evolutionary cosmology, characterized, in particular,
Volodymyr Ratnikov
doaj   +1 more source

N-body methods for relativistic cosmology [PDF]

, 2014
We present a framework for general relativistic N-body simulations in the regime of weak gravitational fields. In this approach, Einstein's equations are expanded in terms of metric perturbations about a Friedmann-Lema\^itre background, which are assumed
Adamek, Julian, Durrer, Ruth, Kunz, Martin   +2 more
core   +1 more source

Correspondence between dark energy quantum cosmology and Maxwell equations

European Physical Journal C: Particles and Fields, 2019
A Friedmann–Robertson–Walker cosmology with dark energy can be modelled using a quintessence field. That system is equivalent to a relativistic particle moving on a two-dimensional conformal spacetime.
Felipe A. Asenjo, Sergio A. Hojman
doaj   +1 more source

Analogy between equilibrium beach profiles and closed universes

Physical Review Research, 2019
We reformulate the variational problem describing equilibrium beach profiles in the thermodynamic approach of Jenkins and Inman [J. Geophys. Res.: Oceans 111, C02003 (2006)10.1029/2005JC002899].
Valerio Faraoni
doaj   +1 more source

Cosmic Analogues of Classic Variational Problems

Universe, 2020
Several classic one-dimensional problems of variational calculus originating in non-relativistic particle mechanics have solutions that are analogues of spatially homogeneous and isotropic universes.
Valerio Faraoni
doaj   +1 more source

On the time delay between ultra-relativistic particles

Physics Letters B, 2016
The time delay between the receptions of ultra-relativistic particles emitted simultaneously is a useful observable for both fundamental physics and cosmology.
Pierre Fleury
doaj   +1 more source

Analogues of glacial valley profiles in particle mechanics and in cosmology

FACETS, 2017
An ordinary differential equation describing the transverse profiles of U-shaped glacial valleys has two formal analogies, which we explore in detail, bridging these different areas of research.
Valerio Faraoni, Adriana M. Cardini
doaj   +1 more source