Citation

BibTex format

@article{Alexandre:2024:02/036,
author = {Alexandre, B and Gielen, S and Magueijo, J},
doi = {02/036},
journal = {Journal of Cosmology and Astroparticle Physics},
title = {Overall signature of the metric and the cosmological constant},
url = {http://dx.doi.org/10.1088/1475-7516/2024/02/036},
volume = {2024},
year = {2024}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We consider a little known aspect of signature change, where the overall sign of the metric is allowed to change, with physical implications. We show how, in different formulations of general relativity, this type of classical signature change across boundaries with a degenerate metric can be made consistent with a change in sign (and value) of the cosmological constant Λ. In particular, the separate "mostly plus" and "mostly minus" signature sectors of Lorentzian gravity are most naturally associated with different signs of Λ. We show how this general phenomenon allows for classical solutions where the open dS patch can arise from a portion of AdS space time. These can be interpreted as classical "imaginary space" extensions of the usual Lorentzian theory, with a2 < 0.
AU  - Alexandre,B
AU  - Gielen,S
AU  - Magueijo,J
DO  - 02/036
PY  - 2024///
SN  - 1475-7516
TI  - Overall signature of the metric and the cosmological constant
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2024/02/036
UR  - http://hdl.handle.net/10044/1/110252
VL  - 2024
ER  -
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