Results 81 to 90 of about 400,960 (288)
Bulk Viscosity, Decaying Dark Matter, and the Cosmic Acceleration [PDF]
, 2006 We discuss a cosmology in which cold dark-matter particles decay into relativistic particles. We argue that such decays could lead naturally to a bulk viscosity in the cosmic fluid.
A. G. Doroshkevich +7 more
core +3 more sources
American Journal of Community Psychology, Volume 76, Issue 3-4, Page 459-471, December 2025.Abstract This qualitative study explores how Indigenous, racialized, and Global South practitioners and scholars engage in liberatory praxis, drawing on decolonial theory and critical psychologies, to reimagine community wellbeing and mental health (CWMH) beyond Western‐based psychological frameworks.
Ramy Barhouche
wiley +1 more source
New explanation for accelerated expansion and flat galactic rotation curves
European Physical Journal C: Particles and Fields, 2020 Employing the non-additive Tsallis entropy, $$S\sim A^{\beta }$$ S∼Aβ , for the large-scale gravitational systems, we disclose that in the cosmological scales both the Friedmann equation and the equation of motion for Newtonian cosmology get modified ...
Ahmad Sheykhi
doaj +1 more source
Modified cosmology through Kaniadakis horizon entropy
European Physical Journal C: Particles and Fields, 2021 We apply the gravity-thermodynamics conjecture, namely the first law of thermodynamics on the Universe horizon, but using the generalized Kaniadakis entropy instead of the standard Bekenstein–Hawking one.
Andreas Lymperis +2 more
doaj +1 more source
Non-Relativistic Spacetimes with Cosmological Constant
, 1999 Recent data on supernovae favor high values of the cosmological constant. Spacetimes with a cosmological constant have non-relativistic kinematics quite different from Galilean kinematics.
A L Barbosa +18 more
core +2 more sources
Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies [PDF]
, 2017 We obtain novel closed form solutions to the Friedmann equation for cosmological models containing a component whose equation of state is that of radiation $(w=1/3)$ at early times and that of cold pressureless matter $(w=0)$ at late times.
Portillo, Stephen KN, Slepian, Zachary
core +2 more sources
The Stochastic‐Dissipative Störmer Problem‐Trajectories and Radiation Patterns
Annalen der Physik, Volume 537, Issue 12, December 2025.We consider charged particle motion and radiation in a dipole magnetic field, in the presence of friction and of stochastic forces. The numerical solutions of the Langevin equation reveal how these forces modify the complex dynamics of particles, and they offer some new insights into the nonlinear processes relevant to planetary radiation belts ...
Tiberiu Harko, Gabriela Raluca Mocanu
wiley +1 more source
Gravitational matter creation, multi-fluid cosmology and kinetic theory
European Physical Journal C: Particles and Fields, 2023 A macroscopic and kinetic relativistic description for a decoupled multi-fluid cosmology endowed with gravitationally induced particle production of all components is proposed.
S. R. G. Trevisani, J. A. S. Lima
doaj +1 more source
Late Decaying Dark Matter, Bulk Viscosity and the Cosmic Acceleration
, 2008 We discuss a cosmology in which cold dark matter begins to decay into relativistic particles at a recent epoch (z < 1). We show that the large entropy production and associated bulk viscosity from such decays leads to an accelerating cosmology as ...
A. G. Doroshkevich +11 more
core +1 more source
Provincializing Frankfurt: A Postcolonial Rereading of Habermasian Theory
Constellations, EarlyView.
Floris Biskamp
wiley +1 more source