Earliest astrophysical object yet seen

Physics Today ◽  
2009 ◽  
Keyword(s):  
1980 ◽  
Vol 58 (11) ◽  
pp. 1595-1598 ◽  
Author(s):  
R. B. Mann ◽  
J. W. Moffat

The wave equation for a scalar field ψ is solved in the background metric of a new theory of gravity, based on a non-Riemannian field structure with a nonsymmetric Hermitian gμν. In contrast to the solution of the problem in a Schwarzschild background metric, in which only orbits close to r ~ 3M yield significant gravitational radiation, the new metric leads to an effective potential with stable orbits for a substantial range of r. The solution yields ψ = (1 − ℓ4/r4)−1/2ψGR where ℓ is a new integration constant. The null surface r = ℓ determines an astrophysical object called a "deflectar", which for ℓ > 2M conceals the Schwarzschild black-hole event horizon at r = 2M. As r → ℓ the gravitational synchrotron radiation increases to infinity. The actual power output of gravitational radiation for physically allowed stable orbits closest to r = ℓ is estimated, demonstrating that a deflectar is a potentially strong source of gravitational radiation.


Author(s):  
V. O. Gladyshev ◽  
A. A. Tereshin ◽  
I. V. Fomin ◽  
M. B. Chelnokov ◽  
V. L. Kauts ◽  
...  

2014 ◽  
Vol 348 ◽  
pp. 189-215
Author(s):  
R. Leticia Corral Bustamante ◽  
Evelyn M. Rodríguez Corral ◽  
José Nino Hernández Magdaleno ◽  
Gilberto Irigoyen Chávez

In this work it is presented the modeling and simulation of energy transfer and fluid flow of a stationary spherical arrangement of particles surrounding a gravitational body such as an astrophysical object that carries the curvature of space-time continuum in general relativity, taking into account the thermodynamics of the second law. This model also predicts the drag of space and time around an astrophysical object as it rotates, with results close to the experimental data reported by other authors. To model the energy transfer of the mass and the fluid flow in the space-time, it is used a 4-dimensional system. In order to make measurements of entropy in the arrow of time (past-present), tensors in General Relativity were used to calculate this thermodynamic quantity and with this, the big bang ́s low entropy condition in phase space of coarse graining (Hawking ́s box), according to Weyl curvature hypothesis (WCH) of Roger Penrose. Contribution of this paper is presented by tensors which carry information that has to do with something as non-distortion effect in fluid flow around the astrophysical object and the low entropy condition that is believed to exist in the past, in the big bang;what leads us to search for a new physical-mathematical science to continue. At this point, the Einstein field equations are out of context, which leads us to conclude that it is necessary a mathematical science that allows us to make calculations to rescue lost information due to collapse of matter to a black hole. This math should allow us to clear up physical phenomena (like origin of the universe) and their relationship, with the objective of unifying theories that lead to a physical science without uncertainties, as at the present time. In this regard, we propose a metric in hyperbolic coodinates to build a physical wormhole shaped object where gravitational bodies can be housed that allow us to link the past entropy with the present entropy according to the second law of thermodynamics, as a kind of mathematical space or alternative model to compensate in some way, the link between WCH and the phase space volume of the Hawking's box, and the link between WCH and the quantum-mechanical state-vector reduction, , proposed by Penrose which still have not been determined by any author. Nomenclature


2019 ◽  
Vol 35 (07) ◽  
pp. 2050034 ◽  
Author(s):  
Tuhina Manna ◽  
Farook Rahaman ◽  
Monimala Mondal

In this paper, we have investigated the classical tests of General Relativity like precession of perihelion, deflection of light and time delay by considering a phenomenological astrophysical object like Sun, as a neutral regular Hayward black hole in Rastall gravity. We have tabulated all our results for some appropriate values of the parameter [Formula: see text]. We have compared our values with [Formula: see text], which corresponds to the Schwarzschild case. Also the value of [Formula: see text] is of particular interest as it gives some promising results.


1997 ◽  
Vol 180 ◽  
pp. 259-259
Author(s):  
F.C. McKenna ◽  
F. P. Keenan ◽  
L. H. Aller ◽  
S. Hyung ◽  
W. A. Feibelman ◽  
...  

The 2s21S0–2s2p 3P1 intercombination line at 1218.34 Å of Be-like O V has been observed in IUE spectra of gaseous nebulae such as RR Tel (Doschek & Feibelman 1993). However, the forbidden line at 1213 Å has not been detected to date in any astrophysical object, with the possible exception of the Sun, where Sandlin, Brueckner & Tousey (1977) very tentatively identify the line at 1213.90 Å in an off-limb spectrum.


1986 ◽  
Vol 64 (11) ◽  
pp. 1566-1568
Author(s):  
C. Wolf

The common belief that ultrarelativistic particles and disordered radiation obeying the equation of state P = ε/3 cannot be contained by the gravitational field is shown to be incorrect if a thin film of Higgs vacuum (away from the minimum of the potential) is allowed to provide a transition region between the interior and the true vacuum outside the astrophysical object.


Nature ◽  
1990 ◽  
Vol 346 (6285) ◽  
pp. 637-638 ◽  
Author(s):  
T. Tomov ◽  
D. Kolev ◽  
L. Georgiev ◽  
R. Zamanov ◽  
A. Antov ◽  
...  
Keyword(s):  

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