scholarly journals Euclidean wormholes and holography

2019 ◽  
Vol 2019 (6) ◽  
Author(s):  
P. Betzios ◽  
E. Kiritsis ◽  
O. Papadoulaki
Keyword(s):  
Euclidean Wormholes

scholarly journals What if? Exploring the multiverse through Euclidean wormholes

2017 ◽  
Vol 77 (10) ◽  
Author(s):  
Mariam Bouhmadi-López ◽  
Manuel Krämer ◽  
João Morais ◽  
Salvador Robles-Pérez
Keyword(s):  
Euclidean Wormholes

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.

scholarly journals Fuzzy Instantons in Landscape and Swampland: Review of the Hartle–Hawking Wave Function and Several Applications

Universe ◽  
2021 ◽  
Vol 7 (10) ◽  
pp. 367
Author(s):  
Dong-han Yeom
Keyword(s):  
Black Hole ◽  
Wave Function ◽  
Path Integral ◽  
Initial Conditions ◽  
Black Hole Physics ◽  
Slow Roll ◽  
Potential Shape ◽  
Euclidean Wormholes ◽  
The Universe ◽  
Origin Of The Universe

The Euclidean path integral is well approximated by instantons. If instantons are dynamical, they will necessarily be complexified. Fuzzy instantons can have multiple physical applications. In slow-roll inflation models, fuzzy instantons can explain the probability distribution of the initial conditions of the universe. Although the potential shape does not satisfy the slow-roll conditions due to the swampland criteria, the fuzzy instantons can still explain the origin of the universe. If we extend the Euclidean path integral beyond the Hartle–Hawking no-boundary proposal, it becomes possible to examine fuzzy Euclidean wormholes that have multiple physical applications in cosmology and black hole physics.

scholarly journals AdS Euclidean wormholes

2021 ◽  
Author(s):  
Donald M Marolf ◽  
Jorge Santos
Keyword(s):  
Euclidean Wormholes

scholarly journals Euclidean wormholes with minimally coupled scalar fields

2013 ◽  
Vol 30 (17) ◽  
pp. 175013 ◽  
Author(s):  
Soumendranath Ruz ◽  
Subhra Debnath ◽  
Abhik Kumar Sanyal ◽  
Bijan Modak
Keyword(s):  
Scalar Fields ◽  
Euclidean Wormholes

scholarly journals Hartle-Hawking wave function and large-scale power suppression of CMB

2018 ◽  
Vol 168 ◽  
pp. 08002
Author(s):  
Dong-han Yeom
Keyword(s):  
Wave Function ◽  
Power Spectrum ◽  
Quantum Cosmology ◽  
Large Scale ◽  
Integral Approach ◽  
Scale Invariant ◽  
Instanton Solution ◽  
Euclidean Wormholes ◽  
Potential Parameters ◽  
Suitable Potential

In this presentation, we first describe the Hartle-Hawking wave function in the Euclidean path integral approach. After we introduce perturbations to the background instanton solution, following the formalism developed by Halliwell-Hawking and Laflamme, one can obtain the scale-invariant power spectrum for small-scales. We further emphasize that the Hartle-Hawking wave function can explain the large-scale power suppression by choosing suitable potential parameters, where this will be a possible window to confirm or falsify models of quantum cosmology. Finally, we further comment on possible future applications, e.g., Euclidean wormholes, which can result in distinct signatures to the power spectrum.

QUANTUM STATE AND SPONTANEOUS SYMMETRY BREAKING IN GRAVITY

1994 ◽  
Vol 03 (01) ◽  
pp. 191-194
Author(s):  
PEDRO F. GONZALEZ-DIAZ
Keyword(s):  
Quantum Gravity ◽  
Symmetry Breaking ◽  
Density Matrix ◽  
Spontaneous Symmetry Breaking ◽  
Quantum State ◽  
Positive Definite ◽  
General Quantum ◽  
Breaking Mechanism ◽  
Euclidean Wormholes

A spontaneous symmetry breaking mechanism is used in quantum gravity to obtain a convergent positive definite density-matrix as the most general quantum state of Euclidean wormholes.

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