ONE-LOOP QUANTUM GRAVITY ON DE SITTER SPACE

1993 ◽  
Vol 08 (09) ◽  
pp. 1637-1652 ◽  
Author(s):  
D.V. VASSILEVICH
Keyword(s):  
Quantum Gravity ◽  
Path Integral ◽  
Loop Quantum Gravity ◽  
De Sitter Space ◽  
De Sitter

We demonstrate that being formulated properly all the approaches to de Sitter quantum gravity give the same one-loop path integral as was obtained by Taylor and Veneziano in a framework of the gauge fixed procedure.

scholarly journals Comment on Coleman-DeLuccia instantons

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Thomas Banks ◽  
Bingnan Zhang
Keyword(s):  
Models Of Quantum Gravity ◽  
Quantum Gravity ◽  
Transition Probabilities ◽  
Detailed Balance ◽  
De Sitter Space ◽  
Positive Energy ◽  
De Sitter ◽  
Finite Area ◽  
Quantum Models

We complete an old argument that causal diamonds in the crunching region of the Lorentzian continuation of a Coleman-Deluccia instanton for transitions out of de Sitter space have finite area, and provide quantum models consistent with the principle of detailed balance, which can mimic the instanton transition probabilities for the cases where this diamond is larger or smaller than the causal patch of de Sitter space. We review arguments that potentials which do not have a positive energy theorem when the lowest de Sitter minimum is shifted to zero, may not correspond to real models of quantum gravity.

THERMODYNAMICS OF de SITTER SPACE–TIME IN YORK'S FORMALISM

2001 ◽  
Vol 16 (23) ◽  
pp. 1487-1492 ◽  
Author(s):  
BO-BO WANG ◽  
CHAO-GUANG HUANG
Keyword(s):  
Black Holes ◽  
Cosmological Constant ◽  
Path Integral ◽  
De Sitter Space ◽  
Space Time ◽  
Integral Approach ◽  
De Sitter ◽  
First Law Of Thermodynamics ◽  
Path Integral Approach ◽  
Thermodynamics Of Black Holes

The York's formalism of path-integral approach to the thermodynamics of black holes is applied to de Sitter space–time. The first law of thermodynamics for de Sitter space–time is given, which includes a "work term" with respect to the cosmological constant.

scholarly journals REAL OR IMAGINARY? ON PAIR CREATION IN DE SITTER SPACE

2010 ◽  
Vol 25 (33) ◽  
pp. 2815-2823 ◽  
Author(s):  
EMIL T. AKHMEDOV
Keyword(s):  
Scalar Field ◽  
Path Integral ◽  
Effective Action ◽  
Particle Production ◽  
De Sitter Space ◽  
Pair Creation ◽  
De Sitter ◽  
Feynman Propagator

Using properly defined Feynman propagator we obtain nonzero imaginary contribution to the scalar field effective action in even-dimensional de Sitter space. Such a propagator follows from the path integral in de Sitter space and obeys composition principle proposed in arXiv:0709.2899. The obtained expression for the effective action shows particle production with the Gibbons–Hawking rate.

nflation from the Persepective of Quantum Gravity

2020 ◽  
Vol 29 (11) ◽  
pp. 26-30
Author(s):  
Seoktae KOH ◽  
Jinn-Ouk GONG ◽  
Min-Seok SEO
Keyword(s):  
Field Theory ◽  
Quantum Gravity ◽  
Effective Field Theory ◽  
Model Building ◽  
Quantum Fluctuations ◽  
De Sitter Space ◽  
Effective Field ◽  
De Sitter ◽  
Space Model

A brief review on inflation is given from the quantum gravity perspective. Using the effective field theory, we discuss quantum fluctuations and how they evolve into classical perturbations. We then list some limitations on de Sitter space model building and unresolved issues of inflation theory, together with persepectives.

Sign in / Sign up

Export Citation Format

Share Document