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Quasi-local observables in quantum gravity

Total Cost €


EC-Contrib. €






Project "QLO-QG" data sheet

The following table provides information about the project.


Organization address
postcode: YO10 5DD

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country United Kingdom [UK]
 Project website
 Total cost 183˙454 €
 EC max contribution 183˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2015
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2016
 Duration (year-month-day) from 2016-07-01   to  2018-06-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITY OF YORK UK (YORK NORTH YORKSHIRE) coordinator 183˙454.00


 Project objective

While a full theory of quantum gravity remains yet elusive, one can still make quantum-gravitational predictions by treating gravity perturbatively around a fixed classical background. This approach is particularly important in cosmology, where tree-level predictions have been confirmed in observations, and next-generation experiments measuring the 21-cm hydrogen line are very likely sensitive enough to test loop corrections. The objective of this proposal is the study of correlation functions at fixed geodesic distance. These observables possess two desirable properties: a) they are confined to a region of finite physical size, and thus measurable, so that one can test the predictions of any theory of quantum gravity against them; and b) they are gauge-invariant, and thus can be used to separate physical effects from gauge artefacts in many gauge-fixed loop calculations that have been carried out in cosmology. The main open problem about these observables is how to renormalise them, which has not been solved even at the one-loop order in perturbation theory. To solve this problem, we apply ideas from the study of Wilson loops in non-Abelian gauge theories, the only other nonlocal observable in quantum field theory which has been investigated in detail. Since these observables are also potentially important in AdS/CFT correspondence, we study them for all maximally symmetric spaces, i.e. Minkowski, de Sitter as well as anti-de Sitter spaces.


year authors and title journal last update
List of publications.
2018 Markus B Fröb
Gauge-invariant quantum gravitational corrections to correlation functions
published pages: 55006, ISSN: 0264-9381, DOI: 10.1088/1361-6382/aaa74c
Classical and Quantum Gravity 35/5 2019-06-13
2017 Markus B. Fröb, Enric Verdaguer
Quantum corrections for spinning particles in de Sitter
published pages: 022-022, ISSN: 1475-7516, DOI: 10.1088/1475-7516/2017/04/022
Journal of Cosmology and Astroparticle Physics 2017/04 2019-06-13
2018 Markus B Fröb, Thomas-Paul Hack, Igor Khavkine
Approaches to linear local gauge-invariant observables in inflationary cosmologies
published pages: 115002, ISSN: 0264-9381, DOI: 10.1088/1361-6382/aabcb7
Classical and Quantum Gravity 35/11 2019-06-13
2017 Markus B. Fröob, Thomas-Paul Hack, Atsushi Higuchi
Compactly supported linearised observables in single-field inflation
published pages: 043-043, ISSN: 1475-7516, DOI: 10.1088/1475-7516/2017/07/043
Journal of Cosmology and Astroparticle Physics 2017/07 2019-06-13
2018 Markus B Fröb, William C C Lima
Propagators for gauge-invariant observables in cosmology
published pages: 95010, ISSN: 0264-9381, DOI: 10.1088/1361-6382/aab427
Classical and Quantum Gravity 35/9 2019-06-13
2018 Fröb, Markus B.
Anomalies in time-ordered products and applications to the BV-BRST formulation of quantum gauge theories
published pages: , ISSN: , DOI:
1 2019-06-13
2016 Markus B. Fröb
Quantum gravitational corrections for spinning particles
published pages: , ISSN: 1029-8479, DOI: 10.1007/JHEP10(2016)051
Journal of High Energy Physics 2016/10 2019-06-13
2018 Fröb, Markus B.
One-loop quantum gravitational backreaction on the local Hubble rate
published pages: , ISSN: , DOI:
1 2019-06-13
2018 Markus B. Fröb, Mojtaba Taslimi Tehrani
Green’s functions and Hadamard parametrices for vector and tensor fields in general linear covariant gauges
published pages: 25022, ISSN: 2470-0010, DOI: 10.1103/PhysRevD.97.025022
Physical Review D 97/2 2019-06-13
2018 Markus B Fröb
One-loop quantum gravitational corrections to the scalar two-point function at fixed geodesic distance
published pages: 35005, ISSN: 0264-9381, DOI: 10.1088/1361-6382/aa9ad1
Classical and Quantum Gravity 35/3 2019-06-13

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