Results 31 to 40 of about 2,969 (164)

Formation and Evolution of Structure in Loop Cosmology [PDF]

Physical Review Letters, 2007
Inhomogeneous cosmological perturbation equations are derived in loop quantum gravity, taking into account corrections in particular in gravitational parts. This provides a framework for calculating the evolution of modes in structure formation scenarios related to inflationary or bouncing models.
Bojowald, M., Hernandez, H., Kagan, M., Singh, P., Skirzewski, A.   +4 more
openaire   +5 more sources

Gravitational Lenses and Cosmological Evolution [PDF]

Symposium - International Astronomical Union, 1982
Empirical descriptions of cosmological evolution rely on an assumed relation between luminosity distance and redshift in order to derive the luminosity function and its epoch dependence. This relation is usually taken to be that of an idealised Friedmann cosmology, despite the obvious abundance of small-scale structure in the Universe.
openaire   +2 more sources

Evolution of cosmological perturbations in the brane world [PDF]

Physical Review D, 2000
28 pages, 4 figures, typos in published version are ...
Koyama, K, Soda, J
openaire   +2 more sources

Perturbations in Bianchi-V Spacetimes with Varying Λ, G and Viscous Fluids

Universe, 2023
As a follow-up of a recent article in which we investigated the cosmological background expansion history of the universe in Bianchi type-V cosmological models with bulk viscous fluid and evolving cosmological Λ and Newtonian G parameters, we study the ...
Amare Abebe, Alnadhief H. A. Alfedeel, Değer Sofuoğlu, Eltegani I. Hassan, Rishi Kumar Tiwari   +4 more
doaj   +1 more source

Cosmological evolution of global monopoles [PDF]

Physical Review D, 2001
6 pages, 2 figures, to appear in Phys. Rev. D (R)
openaire   +2 more sources

The Maxwell–Chern–Simons gravity, and its cosmological implications

European Physical Journal C: Particles and Fields, 2017
We consider the cosmological implications of a gravitational theory containing two vector fields coupled via a generalized Chern–Simons term. One of the vector fields is the usual Maxwell field, while the other is a constrained vector field with constant
Zahra Haghani, Tiberiu Harko, Shahab Shahidi   +2 more
doaj   +1 more source

Chaos and Topological Evolution in Cosmology [PDF]

International Journal of Bifurcation and Chaos, 1997
An elementary account on the chaoticity of galactic world-lines in an open universe is given. A new type of cosmic evolution by global metrical deformations, unpredicted by Einstein's equations, is pointed out. Physical effects of this evolution are backscattering of electromagnetic fields and particle creation in quantum fields.
openaire   +2 more sources

COSMOLOGICAL EVOLUTION IN A BRANE UNIVERSE [PDF]

The Ninth Marcel Grossmann Meeting, 2002
2 pages, "mprocl.sty" with LaTeX 2.09; contribution to the 9th Marcel Grossmann Meeting (MG9), Rome, July ...
openaire   +2 more sources

Cosmological evolution of the rolling tachyon [PDF]

Physics Letters B, 2002
The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon rolls down to the minimum of its potential the universe expands.
openaire   +2 more sources

Interacting dark energy models within the context of the particle creation framework: A dynamical systems study

Results in Physics
In this paper, we employ the dynamical system method to probe the cosmological evolution in a matter creation model admitting interacting dark energy behavior.
Aman Shukla, Ashutosh Singh, Raghavendra Chaubey   +2 more
doaj   +1 more source