Results 51 to 60 of about 2,969 (164)
Cosmological Evolution of Quasars [PDF]
The Astrophysical Journal, 1996 Latex, 2 PS figures, To Appear in ...
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Eurasian Physical Technical JournalA cosmological model of an expanding Universe with scalar–fermion interactions is considered.Our model is based on the interaction of scalar and fermion fields via a Yukawa-type coupling, which influences the development of cosmological expansion in its
Aisara Ratbay +3 more
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Quasars and Cosmological Evolution [PDF]
Symposium - International Astronomical Union, 1978 The first evidence that quasars exhibit a non-uniform distribution in the universe was obtained ten years ago from a sample of 33 quasars in the 3CR catalogue. Much larger samples of radio quasars are now available and we will discuss the results in terms of an exponential decrease of quasar numbers with cosmic time.
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Double-layered vacuum bubbles and cosmological phase transitions
European Physical Journal C: Particles and FieldsWe investigate the evolution and formation of double-layered vacuum bubbles during cosmological phase transitions with multiple vacua. We employ lattice simulations to show that flyover transitions can produce double-layered vacuum bubbles by overcoming ...
Dongdong Wei, Zong-Kuan Guo, Qiqi Fan
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Scaling properties of cosmological axion strings
Physics Letters B, 2019 There has been recent interest in the evolution and cosmological consequences of global axionic string networks, and in particular in the issue of whether or not these networks reach the scale-invariant scaling solution that is known to exist for the ...
C.J.A.P. Martins
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Scalar Field Cosmology -- Improving the Cosmological Evolutional Scenario
, 2011 4 pages, 3 figures; Proceedings of the XXIIIrd Rencontres de Blois, Chateau de Blois, Loire Valley, France, May 29 - June 3 ...
Szydłowski, Marek, Hrycyna, Orest
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Appearances are deceptive: can graviton have a mass?
Journal of High Energy PhysicsWe study the dynamics of linear gravitational perturbations on cosmological backgrounds of massive fermionic fields. We observe that, when gravitational and matter action are expanded to quadratic order in gravitational perturbations on cosmological ...
Leihua Liu, Tomislav Prokopec
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On the Decline of Star Formation during the Evolution of Galaxies
The Astrophysical Journal, 2023 Cosmological simulations predict that during the evolution of galaxies, the specific star formation rate continuously decreases. In a previous study we showed that generally this is not caused by the galaxies running out of cold gas but rather a decrease
Adelheid Teklu +4 more
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Cosmological Evolution of Gamma-Ray Bursts
The Astrophysical JournalGamma-ray bursts (GRBs) are classified as long (LGRBs) and short (SGRBs), with collapsars and compact-object mergers—neutron star–neutron star or or neutron star–black hole—as progenitors, respectively.
Sujay Champati +2 more
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SCALAR COSMOLOGICAL PERTURBATIONS OF PRESSURELESS MATTER IN THE BRANEWORLD MODEL
Odessa Astronomical Publications, 2012 We present a complete set of differential equations describing the evolution of scalar cosmological perturbations of pressureless matter on the brane in the general case where the action of the model contains the induced-curvature term as well as the ...
A. V. Viznyuk, Yu. V. Shtanov
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