Imperial College London
Alternate

Prof Joao Magueijo

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
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Contact

 

j.magueijo Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Magueijo:2020:10.1103/physrevd.102.064006,
author = {Magueijo, J and Zlosnik, T and Speziale, S},
doi = {10.1103/physrevd.102.064006},
journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology},
pages = {064006  1--064006  14},
title = {Quantum cosmology of a dynamical Lambda},
url = {http://dx.doi.org/10.1103/physrevd.102.064006},
volume = {102},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - By allowing torsion into the gravitational dynamics one can promote the cosmological constant Λ to a dynamical variable in a class of quasitopological theories. In this paper we perform a minisuperspace quantization of these theories in the connection representation. If Λ is kept fixed, the solution is a delta-normalizable version of the Chern-Simons (CS) state, which is the dual of the Hartle and Hawking and Vilenkin wave functions. We find that the CS state solves the Wheeler–De Witt equation also if Λ is rendered dynamical by an Euler quasitopological invariant, in the parity-even branch of the theory. In the absence of an infrared (IR) cutoff, the CS state suggests the marginal probability P(Λ)=δ(Λ). Should there be an IR cutoff (for whatever reason), the probability is sharply peaked at the cut off. In the parity-odd branch, however, we can still find the CS state as a particular (but not most general) solution, but further work is needed to sharpen the predictions. For the theory based on the Pontryagin invariant (which only has a parity-odd branch) the CS wave function no longer is a solution to the constraints. We find the most general solution in this case, which again leaves room for a range of predictions for Λ.
AU  - Magueijo,J
AU  - Zlosnik,T
AU  - Speziale,S
DO  - 10.1103/physrevd.102.064006
EP  - 1
PY  - 2020///
SN  - 1550-2368
SP  - 064006
TI  - Quantum cosmology of a dynamical Lambda
T2  - Physical Review D: Particles, Fields, Gravitation and Cosmology
UR  - http://dx.doi.org/10.1103/physrevd.102.064006
UR  - https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.064006
UR  - http://hdl.handle.net/10044/1/82747
VL  - 102
ER  -
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