scholarly journals WORMHOLE SOLUTION IN VACUUM REAL BRANS-DICKE THEORY

1994 ◽  
Vol 43 (11) ◽  
pp. 1907
Author(s):  
XIAO XING-GUO ◽  
LIU LIAO
Keyword(s):  
Wormhole Solution

scholarly journals A NEW TWO-WAY TRAVERSABLE WORMHOLE SOLUTION FOR VACUUM BRANS-DICKE EQUATIONS

1999 ◽  
Vol 48 (11) ◽  
pp. 2011
Author(s):  
HE FENG ◽  
LIU JIN-WANG ◽  
LIU LIAO
Keyword(s):  
Wormhole Solution ◽  
Traversable Wormhole

scholarly journals Traversability of quantum improved wormhole solution

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
R. Moti ◽  
A. Shojai
Keyword(s):  
Wormhole Solution

Wormhole solution in1Nexpansion scheme of quantum gravity

1991 ◽  
Vol 43 (2) ◽  
pp. 410-418 ◽  
Author(s):  
Kazuo Ghoroku ◽  
Masaru Tanaka
Keyword(s):  
Quantum Gravity ◽  
Wormhole Solution

QUANTUM GRAVITATIONAL EFFECTS AND THE COMPACTIFICATION SCALE IN THE HETEROTIC SUPERSTRING THEORY

1999 ◽  
Vol 14 (01) ◽  
pp. 119-127 ◽  
Author(s):  
M. D. POLLOCK
Keyword(s):  
Black Holes ◽  
Wormhole Solution ◽  
Superstring Theory ◽  
Gravitational Effects ◽  
Parity Symmetry ◽  
Anomalous Term ◽  
Higher Derivative ◽  
Euclidean Action ◽  
Model Independent ◽  
Virtual Black Holes

It is known that quantum gravitational effects due to virtual black holes and wormholes can exert an important influence by violating global symmetries. These processes have recently been investigated by Kallosh et al., who found, for the heterotic superstring theory, that there is a sufficient suppression of deleterious effects via the Euclidean action S E from the presence of higher-derivative terms occurring as a topological invariant, the Euler characteristic χ, regardless of the precise details of the underlying wormhole solution. Here, we consider this result further, arguing, in the absence of inflation, that there are no large wormholes in the heterotic superstring theory for which the wormhole action per se is large enough, topological suppression being the only possibility. The model-independent superstring axion may be susceptible to these corrections, because, as shown by Witten, it possesses a non-linearly realized, global U(1) symmetry, being a real scalar field coupled to the anomalous term [Formula: see text] from the outset, and they are relevant to the R-parity symmetry. Allowing for the unknown effect of the black holes, however, we conjecture that these quantum gravitational effects produce no observable consequences.

BRANS–DICKE AND RELATED EUCLIDEAN WORMHOLES

1998 ◽  
Vol 13 (12) ◽  
pp. 961-971 ◽  
Author(s):  
D. H. COULE
Keyword(s):  
Gravitational Constant ◽  
Einstein Frame ◽  
Quantum Mechanical ◽  
Minimum Length ◽  
Length Scale ◽  
Conformal Transformations ◽  
Wormhole Solution ◽  
Euclidean Wormholes ◽  
Minimum Length Scale ◽  
Euclidean Wormhole

In a recent paper1 Euclidean wormhole solution has been obtained with a vacuum Brans–Dicke theory with parameter ω=0. These wormholes suffer from unphysical values of the gravitational constant. One can relate the various known wormholes by means of conformal transformations; although one should not transform them directly to the Einstein frame as the gravitational constant there is "forced" physical: so removing the wormholes. However, by arguing for the existence of a fundamental minimum length scale such wormholes can now be considered as representative of quantum gravitational phenomena. One can also obtain wormholes as solutions of the quantum mechanical Wheeler–De Witt equation; now in Brans–Dicke for any ω>-3/2.

Noncommutative wormhole solutions in F(T, T𝒢) gravity

2017 ◽  
Vol 32 (13) ◽  
pp. 1750083 ◽  
Author(s):  
M. Sharif ◽  
Kanwal Nazir
Keyword(s):  
Noncommutative Geometry ◽  
Energy Conditions ◽  
Spherically Symmetric ◽  
Wormhole Solution

This paper is devoted to the study of static spherically symmetric wormhole solutions along with noncommutative geometry in the background of F(T, T[Formula: see text]) gravity. We assume a nonzero redshift function as well as two well-known models of this gravity and discuss the behavior of null/weak energy conditions graphically. We conclude that there does not exist any physically acceptable wormhole solution for the first model, but there is a chance to develop physically acceptable wormhole solution in a particular region for the second model.

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