| Issue |
EPL
Volume 110, Number 4, May 2015
|
|
|---|---|---|
| Article Number | 40008 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/110/40008 | |
| Published online | 11 June 2015 | |
Solution to the cosmological-constant problem in a Regge quantum gravity model
1 Departamento de Matemática, Universidade Lusófona de Humanidades e Tecnologias Av. do Campo Grande, 376, 1749-024 Lisboa, Portugal
2 Grupo de Fisica Matemática da Universidade de Lisboa - Av. Prof. Gama Pinto, 2, 1649-003 Lisboa, Portugal
(a) amikovic@ulusofona.pt
(b) vmarko@ipb.ac.rs
Received: 21 January 2015
Accepted: 20 May 2015
We show that it is possible to solve the cosmological constant (CC) problem in a discrete quantum gravity theory based on Regge calculus by using the effective action approach and a special path-integral measure. The effective cosmological constant is given as a sum of 3 terms: the classical CC, the quantum gravity CC and the matter CC. Since the observations can only measure the sum of these 3 terms, we can choose the classical CC to be equal to the negative value of the matter CC. Hence the effective CC is given only by the quantum gravity CC, which is determined by the path-integral measure. Since the path-integral measure depends on a free parameter, this parameter can be chosen such that the effective CC gives the observed value.
PACS: 04.60.Pp – Loop quantum gravity, quantum geometry, spin foams / 04.60.Gw – Covariant and sum-over-histories quantization / 04.62.+v – Quantum fields in curved spacetime
© EPLA, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.