Results 41 to 50 of about 74,681 (258)

Anselm's Temporal‐Ontological Proof

Noûs, EarlyView.
ABSTRACT In his Reply to Gaunilo, Anselm presented two additional arguments for the existence of God beyond those that appear in the Proslogion. In “The Logical Structure of Anselm's Argument,” Robert M. Adams isolates each. One, he develops into a modal ontological argument along the lines of other 20th century ontological arguments (e.g., those of ...
Daniel Rubio
wiley   +1 more source

Loop quantum cosmology and singularities

Scientific Reports, 2017
Loop quantum gravity is believed to eliminate singularities such as the big bang and big crunch singularity. This belief is based on studies of so-called loop quantum cosmology which concerns symmetry-reduced models of quantum gravity. In this paper, the
Ward Struyve
doaj   +1 more source

On the emergence of a classical isotropic universe from a quantum f(R) Bianchi cosmology in the Jordan frame

European Physical Journal C: Particles and Fields, 2023
We demonstrate a spontaneous tendency of quantum wave packets to become quasi-classical, providing a classical limit for the Universe dynamics. However, this limit is not maintained in the future (after a critical value of the relational time) and a ...
Mariaveronica De Angelis, Giovanni Montani   +1 more
doaj   +1 more source

The natural science of cosmology

, 2012
The network of cosmological tests is tight enough now to show that the relativistic Big Bang cosmology is a good approximation to what happened as the universe expanded and cooled through light element production and evolved to the present. I explain why
Bernardi M, Guedes J, Hogg D W, Hubble E, Just D W, Kogut A J, Kolb E W, Komatsu E, Kormendy J, Kormendy J, Lin Y-T, López-Sanjuan C, Magoulas C, McGaugh S S, Nair P, Narlikar J V, O'Dea K P, P J E Peebles, Perlmutter S, Riess A G, Siegel E R, Zhu G   +21 more
core   +1 more source

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, A. G. Doroshkevich, George M. Fuller, Grant J. Mathews, James R. Wilson, L. D. Landau, M. T. Ressell, S. Weinberg   +7 more
core   +3 more sources

On the Possibility of Driving the Electron Flux Probabilistic Models by the AE Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract We present the new probabilistic model of the electron fluxes designed to assess the risks of the spacecraft surface charging for missions with near‐equatorial orbits in the inner magnetosphere. It is a second model developed within a frame of the European Space Agency's activity “Plasma Environment Modeling in the Earth's Magnetosphere ...
S. Dubyagin, N. Ganushkina, A. Sicard, J.‐C. Matéo‐Vélez, L. Monnin, D. Heynderickx, P. Jiggens, G. Deprez, F. Cipriani   +8 more
wiley   +1 more source

Global Morphology of Chorus Waves in the Outer Radiation Belt and the Effect of Geomagnetic Activity and fpe ${f}_{pe}$/fce ${f}_{ce}$

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract Whistler‐mode chorus waves play a key role in driving radiation belt dynamics by enabling both acceleration of electrons to relativistic energies as well as their loss into the atmosphere via pitch‐angle scattering. The ratio between the electron plasma frequency (fpe ${f}_{pe}$) and the electron gyrofrequency (fce ${f}_{ce}$) significantly ...
K. A. Bunting, N. P. Meredith, J. Bortnik, Q. Ma, R. Matsuura, X.‐C. Shen   +5 more
wiley   +1 more source

Zagadnienia kosmologiczne przed Einsteinem

Zagadnienia Filozoficzne w Nauce, 2005
Einstein's first cosmological work, published in 1917, marked the beginning of relativistic cosmology, but it was well founded on earlier questions concerning the world as a whole.
Michał Heller
doaj  

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, Aldrovandi R, Bacry H, Bartlet J G, Cariñena J F, Derome J-R, Gilmore R, Gürsey F, Hall G S, Hawking S W, J G Pereira, Kim A G, Kobayashi S, Künzle H P, Künzle H P, L C B Crispino, R Aldrovandi, Riess Adam G, Weinberg S   +18 more
core   +2 more sources

Causal propagation of geometrical fields in relativistic cosmology [PDF]

, 1998
We employ the extended 1+3 orthonormal frame formalism for fluid spacetime geometries $({\cal M}, {\bf g}, {\bf u})$, which contains the Bianchi field equations for the Weyl curvature, to derive a 44-D evolution system of first-order symmetric hyperbolic
A. Abrahams, C. Bona, C. Bona, D. H. King, D. Kramer, E. Newman, F. A. E. Pirani, F. B. Estabrook, G. F. R. Ellis, G. F. R. Ellis, G. Salzman, George F. R. Ellis, H. Bondi, H. Friedrich, H. Friedrich, H. Friedrich, H. van Elst, H. van Elst, H. van Elst, Henk van Elst, J. A. Wheeler, J. Ehlers, J. Ehlers, J. L. Synge, J. M. Bardeen, J. M. Stewart, J. Wainwright, K. O. Friedrichs, M. A. Scheel, M. Bruni, M. E. Araujo, M. H. P. M. van Putten, P. Szekeres, P. Szekeres, R. Arnowitt, R. Courant, R. Geroch, R. Geroch, R. M. Wald, R. Maartens, R. T. Jantzen, S. Boersma, S. Chandrasekhar, S. Kind, S. Matarrese, S. W. Goode, V. N. Lukash, W. A. Hiscock   +47 more
core   +2 more sources