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Authors = Jorge L. Cervantes-Cota ORCID = 0000-0002-3057-6786

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53 pages, 5295 KiB  
Review
The Unsettled Number: Hubble’s Tension
by Jorge L. Cervantes-Cota, Salvador Galindo-Uribarri and George F. Smoot
Universe 2023, 9(12), 501; https://doi.org/10.3390/universe9120501 - 29 Nov 2023
Cited by 14 | Viewed by 7072
Abstract
One of main sources of uncertainty in modern cosmology is the present rate of the universe’s expansion, H0, called the Hubble constant. Once again, different observational techniques bring about different results, causing new “Hubble tension”. In the present work, we review [...] Read more.
One of main sources of uncertainty in modern cosmology is the present rate of the universe’s expansion, H0, called the Hubble constant. Once again, different observational techniques bring about different results, causing new “Hubble tension”. In the present work, we review the historical roots of the Hubble constant from the beginning of the twentieth century, when modern cosmology originated, to the present. We develop the arguments that gave rise to the importance of measuring the expansion of the Universe and its discovery, and we describe the different pioneering works attempting to measure it. There has been a long dispute on this matter, even in the present epoch, which is marked by high-tech instrumentation and, therefore, in smaller uncertainties in the relevant parameters. It is, again, currently necessary to conduct a careful and critical revision of the different methods before one invokes new physics to solve the so-called Hubble tension. Full article
(This article belongs to the Special Issue Universe: Feature Papers 2023—Cosmology)
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46 pages, 10736 KiB  
Review
The Legacy of Einstein’s Eclipse, Gravitational Lensing
by Jorge L. Cervantes-Cota, Salvador Galindo-Uribarri and George F. Smoot
Universe 2020, 6(1), 9; https://doi.org/10.3390/universe6010009 - 31 Dec 2019
Cited by 12 | Viewed by 13300
Abstract
A hundred years ago, two British expeditions measured the deflection of starlight by the Sun’s gravitational field, confirming the prediction made by Einstein’s General Theory of Relativity. One hundred years later many physicists around the world are involved in studying the consequences and [...] Read more.
A hundred years ago, two British expeditions measured the deflection of starlight by the Sun’s gravitational field, confirming the prediction made by Einstein’s General Theory of Relativity. One hundred years later many physicists around the world are involved in studying the consequences and use as a research tool, of the deflection of light by gravitational fields, a discipline that today receives the generic name of Gravitational Lensing. The present review aims to commemorate the centenary of Einstein’s Eclipse expeditions by presenting a historical perspective of the development and milestones on gravitational light bending, covering from early XIX century speculations, to its current use as an important research tool in astronomy and cosmology. Full article
(This article belongs to the Special Issue Universe: Feature Papers 2019 - Gravitational Physics)
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30 pages, 5467 KiB  
Review
A Brief History of Gravitational Waves
by Jorge L. Cervantes-Cota, Salvador Galindo-Uribarri and George F. Smoot
Universe 2016, 2(3), 22; https://doi.org/10.3390/universe2030022 - 13 Sep 2016
Cited by 58 | Viewed by 29512
Abstract
This review describes the discovery of gravitational waves. We recount the journey of predicting and finding those waves, since its beginning in the early twentieth century, their prediction by Einstein in 1916, theoretical and experimental blunders, efforts towards their detection, and finally the [...] Read more.
This review describes the discovery of gravitational waves. We recount the journey of predicting and finding those waves, since its beginning in the early twentieth century, their prediction by Einstein in 1916, theoretical and experimental blunders, efforts towards their detection, and finally the subsequent successful discovery. Full article
(This article belongs to the Special Issue 100 Years of Chronogeometrodynamics: the Status of the Einstein's Theory of Gravitation in Its Centennial Year)
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