scholarly journals The dynamical evolution of 3-space in a higher dimensional steady state universe

2013 ◽  
Vol 45 (5) ◽  
pp. 959-986 ◽  
Author(s):  
Özgür Akarsu ◽  
Tekin Dereli
Keyword(s):  
Steady State ◽  
Dynamical Evolution ◽  
Higher Dimensional ◽  
State Universe

scholarly journals Testing a Dilaton Gravity Model Using Nucleosynthesis

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Boran ◽  
E. O. Kahya
Keyword(s):  
Steady State ◽  
Gravity Model ◽  
Big Bang ◽  
Universe Model ◽  
Light Elements ◽  
Dilaton Gravity ◽  
Microwave Background ◽  
Big Bang Nucleosynthesis ◽  
Higher Dimensional ◽  
State Universe

Big bang nucleosynthesis (BBN) offers one of the most strict evidences for theΛ-CDM cosmology at present, as well as the cosmic microwave background (CMB) radiation. In this work, our main aim is to present the outcomes of our calculations related to primordial abundances of light elements, in the context of higher dimensional steady-state universe model in the dilaton gravity. Our results show that abundances of light elements (primordial D,3He,4He, T, and7Li) are significantly different for some cases, and a comparison is given between a particular dilaton gravity model andΛ-CDM in the light of the astrophysical observations.

scholarly journals Time Direction of Information Propagation and Cosmology

1972 ◽  
Vol 25 (2) ◽  
pp. 207 ◽  
Author(s):  
DT Pegg
Keyword(s):  
Steady State ◽  
Ad Hoc ◽  
Big Bang ◽  
Information Propagation ◽  
The Past ◽  
The Future ◽  
Consistent Solution ◽  
Electrodynamic Theory ◽  
The Universe ◽  
State Universe

In conventional electrodynamic theory, the advanced potential solution of Maxwell's equations is discarded on the ad hoc basis that information can be received from the past only and not from the future. This difficulty is overcome by the Wheeler?Feynman absorber theory, but unfortunately the existence of a completely retarded solution in this theory requires a steady-state universe. In the present paper conventional electrodynamics is used to obtain a condition which, if satisfied, allows information to be received from the past only, and ensures that the retarded potential is the only consistent solution. The condition is that a function Ua of the future structure of the universe is infinite, while the corresponding function Ur of the past structure is finite. Of the currently acceptable cosmological models, only the steady-state, the open big-bang, and the Eddington-Lema�tre models satisfy this condition. In these models there is no need for an ad hoc reason for the preclusion of advanced potentials.

scholarly journals Magnetic Braking and the Oblique Rotator Model

1970 ◽  
Vol 4 ◽  
pp. 269-273
Author(s):  
L. Mestel ◽  
C. S. Selley
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Stellar Wind ◽  
Rotation Axis ◽  
Dynamical Evolution ◽  
Magnetic Star ◽  
Rotator Model ◽  
Oblique Rotator ◽  
Magnetic Braking

This work investigates the dynamical evolution of a rotating magnetic star which drives a stellar wind. The basic magnetic field of the star is supposed symmetric about an axis, which is inclined at an angle X to the rotation axis k (Figure 1). We adopt the familiar equations of an inviscid perfectly conducting gas. In a steady state, the velocity as seen in a frame rotating with the star is taken as

Steady-State theory and the cosmological controversy

2019 ◽  
pp. 161-205
Author(s):  
Helge Kragh
Keyword(s):  
Steady State ◽  
Big Bang ◽  
State Theory ◽  
Steady State Model ◽  
Big Bang Theory ◽  
Big Bang Model ◽  
Fred Hoyle ◽  
The Big Bang ◽  
The Universe ◽  
State Universe

The presently accepted big-bang model of the universe emerged during the period 1930-1970, following a road that was anything but smooth. By 1950 the essential features of the big-bang theory were established by George Gamow and his collaborators, and yet the theory failed to win recognition. A major reason was that the big-bang picture of the evolving universe was challenged by the radically different picture of a steady-state universe favoured by Fred Hoyle and others. By the late 1950s there was no convincing reason to adopt one theory over the other. Out of the epic controversy between the two incompatible world models arose our modern view of the universe. Although the classical steady-state model was abandoned in the mid-1960s, attempts to modify it can be followed up to the present.

Gravitation and cosmic expansion in conformal space-time

1953 ◽  
Vol 49 (2) ◽  
pp. 285-291 ◽  
Author(s):  
Feza Gürsey ◽  
H. Bondi
Keyword(s):  
Steady State ◽  
Scalar Function ◽  
Space Time ◽  
Conformal Space ◽  
Newtonian Theory ◽  
Cosmic Expansion ◽  
Tensor Theory ◽  
Cosmological Problem ◽  
Theory Of Gravitation ◽  
State Universe

AbstractA simple theory of gravitation is formulated in conformal Riemannian space-time. The metric is determined by a scalar function which satisfies a linear equation. A conclusion in favour of Einstein's general tensor theory is drawn from a discussion of the corrections to the Newtonian theory for purely gravitational phenomena. Finally the theory is applied to the cosmological problem and especially to the possibility of a steady-state universe. The velocity-distance law is shown to be compatible with a constant uniform distribution of matter without the need of artificial assumptions.

From the Solar system comet cloud to near-Earth space

1999 ◽  
Vol 173 ◽  
pp. 339-344 ◽  
Author(s):  
V.V. Emel'yanenko
Keyword(s):  
Steady State ◽  
Solar System ◽  
Dynamical Evolution ◽  
Oort Cloud ◽  
High Eccentricity ◽  
Earth Space ◽  
Near Earth Space ◽  
Short Period ◽  
Absolute Magnitudes ◽  
Continuous Source

AbstractThe dynamical evolution of objects from different zones of the solar system comet cloud to near-Earth space has been investigated. The steady-state number of objects with perihelion distancesq< 1.5 AU and periodsP <20 yr, arising from the near-parabolic flux of comets with absolute magnitudes brighter thanH10= 7 is ∼ 200 − 1000. The corresponding number for Halley-type comets is hundreds of times larger than the number of known Halley-type comets. The flux of objects in the Centaurs zone, captured from the near-parabolic flux is 300 times as large as the flux of new comets. The total number of cometary objects with semi-major axesain the range 50 <a< 500 AU andq∼ 1 AU is ∼ 10 times as large as the number of active comets. The probability of the transfer of objects from the trans-Neptunian orbits with 35 <q< 50 AU anda∼ 600 AU into the Jupiter family is ∼ 0.0001. The calculations show that trans-Neptunian objects on high-eccentricity orbits can be a significant continuous source for both the replenishment of the Oort cloud and the capture to short-period orbits.

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