scholarly journals Reasons in Favor of a Hubble-Lemaître-Slipher’s (HLS) Law

Symmetry ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 35 ◽  
Author(s):  
Emilio Elizalde
Keyword(s):  
Expansion Of The Universe ◽  
Hubble’S Law ◽  
The Universe

Based on historical facts, revisited from a present-day perspective, and on the documented opinions of the scientists involved in the discovery themselves, strong arguments are given in favor of a proposal to add prominent astronomer Vesto Slipher to the suggested addition of Georges Lemaître’s name to Hubble’s law on the expansion of the universe and thus eventually call it the Hubble–Lemaître–Slipher (HLS) law.

scholarly journals Construcción de un diagrama de Hubble: Una herramienta para la Enseñanza de la Astronomía - Building a Hubble Diagram: A Tool for Teaching Astronomy

2016 ◽  
Vol 1 (24) ◽  
pp. 17
Author(s):  
Giovanni Cardona-Rodriguez ◽  
Jaime Duván Reyes- Roncancio ◽  
Mauricio Giraldo
Keyword(s):  
Hubble Parameter ◽  
Sloan Digital Sky Survey ◽  
Educational Activity ◽  
Hubble Diagram ◽  
Evolution Of The Universe ◽  
Sky Survey ◽  
Expansion Of The Universe ◽  
Para Determinar ◽  
Hubble’S Law ◽  
The Universe

Se presenta una actividad que puede apoyar el trabajo de los docentes que dirigen  clubes de Astronomía y quieren abordar el tema de evolución del Universo, ya que   se  reconstruye  la ley de Hubble  a partir de la construcción de un Diagrama de Hubble con  datos  tomados del Sloan Digital Sky Survey   (SDSS) ,  del  cual se obtiene el valor del parámetro de Hubble y se infiere la expansión del Universo. Esta actividad  didáctica permite a los profesores orientar a sus estudiantes por el camino que siguió Hubble  para determinar su ley, en este sentido se exponen algunas implicaciones de aplicación de la misma en el contexto de la formación de profesores de física y de los clubes de Astronomía. Construction of a Hubble Diagram: A tool for teaching astronomyThis article presents the construction and analysis of an activity that can support the work of teachers who run Astronomy clubs and want to address the issue of evolution of the Universe. Here Hubble's law is reconstructed by reproducing a Hubble diagram with Sloan Digital Sky Survey's (SDSS) data, from which the Hubble parameter value is obtained and the expansion of the Universe is inferred. This educational activity allows teachers to guide their students along the path followed by Hubble to determine his law. In this sense some implications of applying the latter are discussed in the context of teacher's training in Physics and Astronomy clubs.Construção de um diagrama de Hubble: Uma ferramenta para ensino de astronomíaSe apresenta uma actividade que pode apoiar o trabalho dos professores que dirigem clubes de Astronomia e querem abordar a questão da evolução do Universo, como a lei de Hubble é reconstruída a partir da reprodução de um diagrama de Hubble com os dados tomados do Sloan digital Sky Survey (SDSS), é achado o parâmetro de Hubble e inferida a expansão do universo. Esta actividade educativa permite aos professores orientar seus alunos ao longo do caminho seguido Hubble para determinar a lei. Neste sentido algumas implicações da aplicação da mesma no contexto da formação de professores de física e clubes astronomia. 

scholarly journals Reasons in favor of a Hubble-Lemaître-Slipher's (HLS) Law

2019 ◽  
Author(s):  
Emilio Elizalde
Keyword(s):  
Expansion Of The Universe ◽  
Hubble’S Law ◽  
The Universe

Based on historical facts, revisited from a present-day perspective, and on the documented opinions of the scientists involved in the discovery themselves, strong arguments are given in favor of a proposal to include prominent astronomer Vesto Slipher to the suggested addition of Georges Lemaître's name to Hubble's law on the expansion of the Universe, and thus eventually call it Hubble-Lemaître-Slipher's (HLS) law.

scholarly journals Reasons in favor of a Hubble-Lemaître-Slipher's (HLS) Law

2018 ◽  
Author(s):  
Emilio Elizalde
Keyword(s):  
Expansion Of The Universe ◽  
Hubble’S Law ◽  
The Universe

Based on historical facts, revisited from a present-day perspective, and on the documented opinions of the scientists involved in the discovery themselves, strong arguments are given in favor of a proposal to include prominent astronomer Vesto Slipher to the suggested addition of Georges Lemaître's name to Hubble's law on the expansion of the Universe, and thus eventually call it Hubble-Lemaître-Slipher's (HLS) law.

scholarly journals Universal expansion with spatially varying G

2019 ◽  
Vol 487 (1) ◽  
pp. L53-L57
Author(s):  
Dimitris M Christodoulou ◽  
Demosthenes Kazanas
Keyword(s):  
Dark Energy ◽  
Asymptotic Behaviour ◽  
Radial Velocity ◽  
Relativistic Case ◽  
Conservation Of Energy ◽  
Universal Expansion ◽  
Expansion Of The Universe ◽  
Hubble’S Law ◽  
Spatially Varying ◽  
The Universe

ABSTRACT We calculate the expansion of the Universe under the assumptions that G varies in space and the radial size r of the Universe is very large (we call this the MOND regime of varying-G gravity). The inferred asymptotic behaviour turns out to be different from that found by McCrea & Milne in 1934 and our equations bear no resemblance to those of the relativistic case. In this cosmology, the scale factor R(t) increases linearly with time t, the radial velocity is driven by inertia, and gravity is incapable of hindering the expansion. Yet, Hubble’s law is borne out without any additional assumptions. When we include a repulsive acceleration ade due to dark energy, the resulting universal expansion is then driven totally by this new term and the solutions for ade → 0 do not reduce to those of the ade ≡ 0 case. This is a realization of a new Thom catastrophe: The inclusion of the new term alters the conservation of energy and the dark energy solutions are not reducible to those in the case without dark energy.

Black Hole Universe: a grand cosmic recycler and Big Bang generator?

2019 ◽  
Author(s):  
Matheus Pereira Lobo
Keyword(s):  
Black Hole ◽  
Big Bang ◽  
Subsequent Increase ◽  
Expansion Of The Universe ◽  
The Universe

We propose the discussion of a highly speculative idea for the scenario where black hole collisions and their subsequent increase in sizes exceed the expansion of the universe.

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