Publications

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}
}
Download

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  -
Download

Note to staff:  Adding new publications to a research group

  1. Log in to Symplectic.
  2. Click on Menu > Create Links
  3. Choose what you want to create links between – in this case ‘Publications’ and ‘Organisational structures’.
  4. Choose the organisational structure (research group) into which you want to link the publications and check the box next to it.
  5. Now check the box of any publication you want to add to that group. You can use the filters to find what you want and select multiple publications if necessary. 
  6. Scroll to the bottom and click the blue ‘Create new link’ button to link them.
  7. The publications will be added to the group, and will be displayed on the group publications feed within 24 hours (it is not immediate).

Any problems, talk to Tim Evans or the Faculty Web Team.