Next Article in Journal
Solvability of the Class of Two-Dimensional Product-Type Systems of Difference Equations of Delay-Type (1, 3, 1, 1)
Next Article in Special Issue
Behaviour of Charged Spinning Massless Particles
Previous Article in Journal
Testing Lorentz Symmetry Using High Energy Astrophysics Observations
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessFeature PaperArticle
Symmetry 2017, 9(10), 202;

Towards a New Proposal for the Time Delay in Gravitational Lensing

Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy
Author to whom correspondence should be addressed.
I.N.F.N.—Sezione di Genova.
Received: 12 September 2017 / Revised: 12 September 2017 / Accepted: 24 September 2017 / Published: 25 September 2017
(This article belongs to the Special Issue Symmetry in Quantum Field Theory)
PDF [425 KB, uploaded 27 September 2017]


One application of the Cosmological Gravitational Lensing in General Relativity is the measurement of the Hubble constant H 0 using the time delay Δ t between multiple images of lensed quasars. This method has already been applied, obtaining a value of H 0 compatible with that obtained from the SNe 1A, but non-compatible with that obtained studying the anisotropies of the CMB. This difference could be a statistical fluctuation or an indication of new physics beyond the Standard Model of Cosmology, so it desirable to improve the precision of the measurements. At the current technological capabilities it is possible to obtain H 0 to a percent level uncertainty, so a more accurate theoretical model could be necessary in order to increase the precision about the determination of H 0 . The actual formula which relates Δ t with H 0 is approximated; in this paper we expose a proposal to go beyond the previous analysis and, within the context of a new model, we obtain a more precise formula than that present in the literature. View Full-Text
Keywords: classical general relativity; gravitational lenses classical general relativity; gravitational lenses

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Alchera, N.; Bonici, M.; Maggiore, N. Towards a New Proposal for the Time Delay in Gravitational Lensing. Symmetry 2017, 9, 202.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Symmetry EISSN 2073-8994 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top