Name or Title or Xtra
Institute of Space Sciences
James Peebles i la revolució cosmològica
Emili Elizalde
ICE/CSIC & IEEC, UAB
Conferencia de la Societat Catalana de FísicaInstitut d’Estudis Catalans
Activitat de la celebració IAU100
Barcelona, 29 Gen 2020
www.ice.csic.es/personal/elizalde/eli/eli.htm
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Institute of Space Sciences
Univers d’Anaximandre 610–546 BC
Univers de Copèrnic, Thomas Digges 1576
Univers de Ptolomeu, s.II
Diversos modelsd’Univers
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Institute of Space Sciences V de Lapparent, M J Geller, J P Huchra, ApJ 3 Mar 1986
Samuel Ting, Premi Nobel 76
Edward Witten, Fields Medal 90
History of Science Collections, University of Oklahoma
http://www.libraries.ou.edu/info/index.asp?id=20http://libraries.ou.edu/
M Grossmann M Maric
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Institute of Space Sciences 1917
Einstein field equations with Λ“Die Gröβte Eselei meines Lebens”
Beginning of (Theoretical) Modern Cosmology
Universe: eternal Universe: static why? Universe = Milky Way
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Institute of Space Sciences 1912
Year 1912
The Beginning of Modern Cosmology
Distances Henrietta S. Leavitt (Cepheids) Velocities Vesto M. Slipher (redshifts)
7 April 1912: Victor Hess discovers cosmic rays
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Institute of Space Sciences
Revista Española de Física • 33-4 • Octubre-diciembre 2019, pp. 39-47
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Institute of Space Sciences Extract from P James E Peebles webpage“Regarding the hypotheses of dark matter and quintessence, I draw attention to the verse
So now we are in Boston,The home of the bean and the cod,Where the Lowells talk only to Cabots,And the Cabots talk only to God.
One might be inclined to compare families of matter that interact only with gravity to the Cabot family. But Percival of the Lowell family used his fortune to establish The Lowell Observatory and bring the Slipher brothers to the Observatory; their notable contributions include the discovery of the cosmological redshift.”
From a toast given in 1910 at a Holy Cross alumni dinner "Here's to dear old Boston,..”
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Institute of Space Sciences Extract from P James E Peebles webpage“... Pel que fa a les hipòtesis de la matèria fosca i la quinta essència, crido l’atenció sobre el versAixí que som a Boston,Llar de les mongetes i del bacallà,On els Lowells només parlen amb els Cabots,Mentre que els Cabots només parlen amb Déu.Hom podria inclinar-se a comparar famílies de matèria que interaccionen només amb la gravetat amb la família Cabot. PeròPercival, de la família Lowell, va fer servir la seva fortuna per construir l'Observatori Lowell i portar-hi allí els germans Slipher; entre les seves notables contribucions hi ha el descobriment del corriment espectral cap al roig cosmològic (redshift) ...”
From a toast given in 1910 at a Holy Cross alumni dinner "Here's to dear old Boston,..”
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Institute of Space Sciences
Observatori Lowell, Flagstaff, Arizona, EEUU
Observatori Mount Wilson, Angeles National Forest, California, EEUU
Vesto Slipher
Edwin Hubble
La revolució cosmológica 1912-29
HenriettaLeavitt
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Institute of Space Sciences LEAVITT
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Institute of Space Sciences SLIPHER
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Institute of Space Sciences
had 25 results, 4 of them blueshifts, and he gave an interpretation on the enormous receding mean velocity, of nearly 500 km/s, of these objects: “This might suggest that the spiral nebulae are scattering but their distribution on the sky is not in accord with this since they are inclined to cluster.”
And he added that:“... our whole stellar system moves and carries us with it. It has for a long time been suggested that the spiral nebulae are stellar systems seen at great distances ... This theory, it seems to me, gains favor in the present observations."
By 1917 Slipher ...
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Institute of Space Sciences THE GREAT DEBATE
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Institute of Space Sciences
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Institute of Space Sciences
Image of H335H shows the glass side of the photographic plate, on which Hubble marked novae and, eventually, the first Cepheid in ink
Hubble variable number one, or V1, two million light-years away in the outer regions of the neighboring Andromeda galaxy, or M31
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Institute of Space Sciences
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Institute of Space Sciences In 1924 Karl Lundmark … In 1924 the Swedish astronomer Karl Lundmark, by making the
assumption that galaxies were standard objects, used their size and brightness to infer their distance from us.
He then tried to find a relationship between the Slipher’s redshifts and the distances and concluded that there might be one, but this was not clear enough.
Actually, Hubble did also make the same assumption but improvedthe table of distances by using Cepheid variable stars, when theywere available (and again Slipher’s redshifts). In this way he found a clear correlation.
Table 1: Radial velocities in km/s of 25 spiral nebulae published by VM Slipher in 1917
Table 1: Distances in Mpc of spiral nebulae published by E Hubble in 1929
“… your velocities and my distances”. Letter of E.P. Hubble to V.M. Slipher, Mar 6, 1953. Biographical Memoirs, Vol 52, National Academy of Sciences (U.S.)
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Institute of Space Sciences
At large scale, the dominant movement of our Universe is dictated by the law:
V = Ho D
Interpretation: 1. Proper movement of the galaxies2. Movement of the reference system, of space-time
Both are right! –But the second prevails at large distances
Ho = (67.8 +/- 0.9) km/s/Mpc [500 Hubble, 1929]
Hubble’s Law
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Institute of Space Sciences
Hubble acknowledged Slipher's seminal contribution to his own work by declaring that:
“… the first steps in a new field are the most difficult and the most significant. Once the barrier is forced further development is relatively simple.”
E.P. Hubble, The realm of the nebulae, Dover Pub. Inc. 1958 [Biographical Memoirs, Vol 52, National Academy of Sciences (U.S.)]
Further: Hubble on Slipher’s contribution
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Institute of Space Sciences
In a letter by Hubble to Willem De Sitter in 1931, he stated his thoughts about the velocities by saying
"... we use the term 'apparent velocities' in order to emphasize the empirical feature of the correlation. The interpretation, we feel, should be left to you and the very few others who are competent to discuss the matter with authority."Sten Odenwald and Rick Fienberg, "Redshifts Reconsidered", Sky Pub Co (1993)
Hubble never said the universe was expanding! http://cecelia.physics.indiana.edu/life/redshift.html
Einstein was convinced in `31 by Eddington, Tolman, and de Sitter (notby Hubble) of the facts that his static model was unstable and that theuniverse was expanding. Harry Nussbaumer, Eur Phys J H39, 37–62 (2014)
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Institute of Space Sciences It took Einstein 10 years to understand …
“On the Curvature of Space”, A. Friedmann, Petersburg Received June 29, 1922, Zeitschrift für Physik
“the Universe may expand since General Relativity equations admit dynamical solutions"
Remark on the work of A. Friedmann, ZfP 1922, “On the Curvature of Space” A. Einstein, Berlin Received September 18, 1922, Zeitschrift für Physik
Albert Einstein and the Friedmann Equations, 8.286, 9/27/07: Alan Guthhttp://web.mit.edu/8.286/www/slides07/Einstein-and-Friedmann.pdf
Publication of the Friedmann Equations
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Institute of Space Sciences Sequence of Events June 29, 1922: Friedmann's paper received at Zeitschrift für Physik September 18, 1922: Einstein's refutation received at Zeitschrift für Physik December 6, 1922: Friedmann learns about Einstein's objection from his friend, Yuri
A. Krutkov, who is visiting in Berlin. Friedmann writes a detailed letter to Einstein. Einstein is traveling and does not read it
May, 1923: Einstein meets Krutkov in Leiden, both attending the farewell lecture by Lorentz, who was retiring
Krutkov's letters to his sister: “On Monday, May 7, 1923, I was reading, together with Einstein, Friedmann's article in the Zeitschrift für Physik." May 18: “I defeated Einstein in the argument about Friedmann. Petrograd's honor is saved!"
May 31, 1923: Einstein's retraction of his refutation is received at Zeitschrift für Physikhttp://web.mit.edu/8.286/www/slides07/Einstein-and-Friedmann.pdf
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Institute of Space Sciences Solvay Conference, Brussels, Belgium, 1927
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Institute of Space Sciences Another meaning for Big Bang
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Institute of Space Sciences Who was first to discover Universe expands? Vesto Slipher was the first to clearly notice, in 1914, that the universe could hardly be static
Albert Einstein first established the theoretical framework, GR in 1915 and applied his equations in 1917, for the first time, to describe the universe
Willem de Sitter was the first to find, in 1917, a solution of GR that describes an expanding universe, but containing no matter or energy (was dismissed as a toy model)
Alexandr Friedmann was the first, in 1922, to clearly say that our universe could be expanding, since he had found a solution to GR that could be interpreted as corresponding to a universe, with the characteristics of ours, which expands
Georges Lemaître was the first to formulate, in 1927, a scientific theory for an (eternal) universe. He linked astronomical data---e.g. speeds (Slipher redshifts) and distances (Hubble table), to get an empirical law of proportionality (two years before Hubble, who did it in 1929)---with a Friedmann solution to GR, which Lemaître himself had rediscovered in 1925
https://www.enciclopedia.cat/divulcat/Emili-Elizalde
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Institute of Space Sciences
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Institute of Space Sciences
L'expansió de l'Univers: Un dels descobriments mésimportants en tota la Història
de la Humanitat
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Institute of Space Sciences
La primera revolució cosmològica: canvià del tot la nostra visió de
l’Univers; de ser estàtic, immutable i etern va passar a tenir un origen –a partir del no-res– i a expansionar-se
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Institute of Space Sciences
Adam Riess Saul Perlmutter Brian SchmidtNobel Prize in Physics 2011
L’expansió de l’Univers no es frena per la gravetat, sino que, contrariament, s’accelera
A Riess, B Schmidt, et al. "Observational evidence fromsupernovae for an accelerating universe and a cosmologicalconstant". Astronomical Journal 116, 1009–38 (1998).
S Perlmutter, ..., P Ruiz‐Lapuente, et al. "Measurementsof Omega and Lambda from 42 high redshiftsupernovae". Astrophysical Journal 517, 565–86 (1999).
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Institute of Space Sciences
La segona revolució cosmològica: hem après, a més, que l’expansió s’accelera constantment, creant
així un misteri absolut on abans hi havia completa certesa
Fritz Zwicky 1898-1974
F. Zwicky, Die Rotverschiebung von extragalaktischen Nebeln, Helvetica Physica Acta, 6: 110–127 (1933) F. Zwicky, On the Masses of Nebulae and of Clusters of Nebulae, Astrophysical Journal, 86: 217 (1937)F. Zwicky, Nebulae as Gravitational Lenses, PhysicalReview 51, 290 (1937)
DunkleMaterie
Corbes de rotació de les Galaxies
Vera Rubin 1928-2016 William K Ford 1931-
“All That Matter ... in One Big Bang ...,” & Other Cosmological SingularitiesE Elizalde *
Galaxies 2018, 6, 25; doi:10.3390/galaxies6010025
arXiv:1801.09550v3 [physics.hist-ph] 25 Jan 2018https://arxiv.org/pdf/1801.09550.pdf
https://www.preprints.org/search?action=search&field=authors&search=Emilio+Elizaldehttps://arxiv.org/pdf/1801.09550.pdf
Reasons in Favor of a Hubble-Lemaître-Slipher’s(HLS) LawEmilio Elizalde
Institute of Space Sciences (ICE/CSIC and IEEC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Bellaterra (Barcelona), Spain
Symmetry 2019, 11(1), 35; https://doi.org/10.3390/sym11010035arXiv:1810.12416 [physics.hist-ph]
https://doi.org/10.3390/sym11010035
OBRINT ELS ULLS...
Big BangEls orígens i el significat del terme
• Una breu (però essencial) lliçó de física -- Llull, Galileu, Newton, Einstein i Hawking: de la fenomenologia a la llei universal
• Sorprenentment (o no) hi ha qui sí que entén la mecànica quàntica --Sobre el significat de la paraula entendre
• L'expansió de l'Univers: Edwin Hubble, Georges Lemaître, Vesto Slipher-- Rescatant Vesto Slipher de l'oblit
• Què és, i què no és, una teoria científica -- Hubble mai no va creure que l'univers s'expandeix
• Vers el final de la ciència? -- Hi ha de fet algun problema amb la física? Diria que no, per molt que alguns ho creuen
• Les dues revolucions cosmològiques del segle XX -- L’univers s’expandeixi va tenir un origen; i encara més, l’expansió de l’univers s’accelera
Divulgació científica en català
http://enciclopedia.cat/divulcat/Emili-Elizaldehttp://enciclopedia.cat/divulcat/Emili-Elizaldehttp://enciclopedia.cat/divulcat/Emili-Elizalde
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Institute of Space Sciences
Gràcies !
L’Univers
Model: • Superfície (2 dimensions, ‘globus goma’)• Res a dins, res per fora; no hi ha un ‘centre’• El ‘globus’ s’expandeix …acceleradament!• El radi del globus és el temps• Tot objecte al voltant nostre s’allunya (redshift)
http://en.wikipedia.org/wiki/Image:Sphere-wireframe.png
Origen de l’Univers… del (quasi) no-res !
Què és el ‘no-res’ ??• En Física Clàssica fonamental, GR:
la sol. de Sitter és la sol. d’energia zero de les EEqs.• En Física Quàntica:
L’estat buit d’un sistema quàntic• De l’espai-temps quàntic Krauss-
Wilczek ‘15, no!• D’un camp escalar (Higgs, inflató, …)
Número de diapositiva 2Número de diapositiva 3Número de diapositiva 4Número de diapositiva 5Número de diapositiva 6Número de diapositiva 7Número de diapositiva 9Número de diapositiva 10Número de diapositiva 11Número de diapositiva 12Número de diapositiva 13Número de diapositiva 17Número de diapositiva 18Número de diapositiva 19Origen de l’Univers
