Daniel Pomarède

Daniel Pomarède graduated from the Interuniversity Magister degree in Physics of the Ecole Normale Supérieure de Paris and Paris Universities (1991–1994), training in diverse research projects: experimental atomic physics in the group led by Marie-Anne Bouchiat at Kastler–Brossel Laboratory, waveguide optics at the Laser Research Group, University of Manchester, supersymmetry at CEA Theoretical Physics Department in Saclay.ORCID [https://orcid.org/0000-0003-2038-0488]

He served overseas as a national service scientific cooperant at Brookhaven National Laboratory in New York and got a Master of Science degree from the University of South Carolina, contributing to the preparation and analysis of nuclear physics experiments on the spin structure of the nucleon.Scholar [https://scholar.google.fr/citations?hl=fr&user=trHB0qQAAAAJ&view_op=list_works&sortby=pubdate#d=gs_md_cita-d&u=%2Fcitations%3Fview_op%3Dview_citation%26hl%3Dfr%26user%3DtrHB0qQAAAAJ%26cstart%3D200%26pagesize%3D100%26sortby%3Dpubdate%26citation_for_view%3DtrHB0qQAAAAJ%3AM7yex6snE4oC%26tzom%3D-120]

In 1999, he completed his Ph.D. in particle physics and cosmology at the Laboratoire de Physique Nucléaire des Hautes Energies at Ecole Polytechnique with a thesis on the search for cosmological antimatter in TeV cosmic rays, using the 10m Imaging Atmospheric Cerenkov Telescope at the F.L. Whipple Observatory in Arizona.Ecole Polytechnique Open Archive [https://hal-polytechnique.archives-ouvertes.fr/in2p3-00008474#]{{Cite web |date=1999 |title=Search for antimatter in 1012 eV cosmic rays using Artemis method and interpretation of the cosmic rays spectrum |url=https://inis.iaea.org/search/46048791 |website=IAEA International Nuclear Information System}}

He then went on postdoctoral positions at CEA Service de Physique des Particules in Saclay and at the Physics Department of the University of Rome, La Sapienza, to work on the preparation of the ATLAS Experiment at CERN.Scholar [https://scholar.google.fr/citations?user=trHB0qQAAAAJ] Back in Saclay, he co-founded in 2005 the COAST Computational Astrophysics Program dedicated to supercomputer simulations in astronomy, in the context of which he developed the SDvision Saclay Data Visualization software.Scholar [https://scholar.google.fr/citations?hl=fr&user=trHB0qQAAAAJ&view_op=list_works&sortby=pubdate%23d=gs_md_cita-d&u=%2Fcitations%3Fview_op%3Dview_citation%26hl%3Dfr%26user%3DtrHB0qQAAAAJ%26cstart%3D200%26pagesize%3D100%26sortby%3Dpubdate%26citation_for_view%3DtrHB0qQAAAAJ%3AVL0QpB8kHFEC%26tzom%3D-120] As of 2010 he is applying these data visualization and analysis techniques in the field of cosmography.New York Times "Beyond the Milky Way, a Galactic Wall" Dennis Overbye, 10 juillet 2020 [https://www.nytimes.com/2020/07/10/science/astronomy-galaxies-attractor-universe.html]NBC News "Master plan of the universe revealed in new galaxy maps" Corey S. Powell, Aug. 11, 2019 [https://www.nbcnews.com/mach/science/master-plan-universe-revealed-new-galaxy-maps-ncna1040936]MIT Technology review "New Science of Cosmography Reveals 3-D Map of the Local Universe" Emerging Technology from the arXiv, June 5, 2013 [https://www.technologyreview.com/2013/06/05/178176/new-science-of-cosmography-reveals-3-d-map-of-the-local-universe]Wired "Spectacular Cosmographic Maps Chart Galaxies and Superclusters in Local Universe" Adam Mann, June 12, 2013 [https://www.wired.com/2013/06/cosmography-maps/]Los Angeles Times "This video is a trip – through the known universe" Geoffrey Mohan, June 14, 2013 [https://www.latimes.com/science/sciencenow/la-sci-sn-video-maps-universe-20130613-story.html]

Daniel Pomarède co-authored several papers in the field of cosmography, the mapping of large-scale matter distribution and kinematics of the observable universe, with the following most significant discoveries:

• Discovery of the Laniakea Supercluster (2014).{{cite journal|first1=R. Brent|last1=Tully|first2=Hélène|last2=Courtois|first3=Yehuda|last3=Hoffman|first4=Daniel|last4=Pomarède|title=The Laniakea supercluster of galaxies|journal=Nature|volume=513|number=7516|pages=71–73|date=4 September 2014|doi=10.1038/nature13674|pmid=25186900|arxiv=1409.0880|bibcode=2014Natur.513...71T|doi-access=free}} This structure was discovered in the velocity field inferred from the Cosmicflows-2 catalogue of peculiar velocities and distances of galaxies, where flowlines within a three-dimensional basin of attraction of typical size 160 Mpc converge on a single attractor (the Great Attractor). The volume enclosing this basin of attraction draws the frontiers of the supercluster within which is located our galaxy, the Milky Way. The structure is named Laniakea, association of the Hawaiian terms Lani, heaven, and Akea, immense, to honor the Polynesian navigators and astronomers who used stars and oceanic currents to guide themselves in the immensity of the Pacific Ocean. This discovery makes the cover[https://web.archive.org/web/20150530163109/http://blogs.nature.com/ofschemesandmemes/2014/09/05/under-the-covers-nature-revealed-4-september-2014 "Under the covers (Nature revealed) - 4 September 2014"] by Alex Jackson in the Nature community blog Of Schemes And Memes (5 September 2014) of Nature, September 4, 2014 edition[https://www.nature.com/nature/volumes/513/issues/7516 Nature, September 4, 2014 edition] and is accompanied by a News article,{{cite news |journal=Nature|url= http://www.nature.com/news/earth-s-new-address-solar-system-milky-way-laniakea-1.15819 |title= Earth's new address: 'Solar System, Milky Way, Laniakea' |author= Elizabeth Gibney |date= 3 September 2014 |doi= 10.1038/nature.2014.15819}} a News & Views article,{{cite journal|author=Elmo Tempel|title=Meet the Laniakea supercluster|journal=Nature|date=3 September 2014|volume=513|issue=7516|pages=41–42|doi=10.1038/513041a|pmid=25186896|doi-access=free}} an Editorial,{{cite journal|title=Heavenly homes|journal=Nature|date=3 September 2014|volume=513|issue=7516|page=6|doi=10.1038/513006a|pmid=25186868|bibcode=2014Natur.513Q...6.|doi-access=free}} and a Nature Video[https://www.youtube.com/watch?v=rENyyRwxpHo Nature Video "Laniakea: Our home supercluster"]
• Discovery of the Dipole Repeller (2017).{{cite journal|first3=R. Brent|last3=Tully|first4=Hélène|last4=Courtois|first1=Yehuda|last1=Hoffman|first2=Daniel|last2=Pomarède|s2cid=7537393|title=The dipole repeller|url=https://www.nature.com/articles/s41550-016-0036.epdf?author_access_token=LO1ZzMmXNoznoF9dgYvoutRgN0jAjWel9jnR3ZoTv0PhlcSZQ0-WVqxmZlvNntQNchpcNIZEIAIyyRO-hIvlJOsrrDINWxB-hIlP3lfBKMMwHrhWHB1caKEySCLlCKdaJLMoaNmo4LVZxG4PcA7UpA%3D%3D |journal=Nature Astronomy|volume=1|pages=0036|date=30 January 2017|issue=2|doi=10.1038/s41550-016-0036|arxiv=1702.02483|bibcode=2017NatAs...1E..36H}} The visualization and analysis of cosmic flows revealed that the velocity field diverges from a region, presumably a large void, that is antialigned with the motion of our galaxy at 630 km/s (which causes a dipole in the temperature distribution of the Cosmic Microwave Background radiation). Matter flowing from underdense to overdense regions, such an underdense region of the Universe act as effective repeller, though the only fundamental force in action is gravitation, an attractive force. The influence of this repeller (push) on our motion is found to be comparable in amplitude to that of the Shapley supercluster (pull). This discovery was published in the newly created Nature Astronomy journal.
• Discovery of the Cold Spot Repeller (2017).{{cite journal|first2=R. Brent|last2=Tully|first1=Hélène|last1=Courtois|first3=Yehuda|last3=Hoffman|first4=Daniel|last4=Pomarède|first5=Romain|last5=Graziani|first6=Alexandra|last6=Dupuy|s2cid=119481425|title=Cosmicflows-3: Cold Spot Repeller?|journal=The Astrophysical Journal Letters|pages=L6|date=14 September 2017|volume=847|issue=1|arxiv=1708.07547|doi=10.3847/2041-8213/aa88b2|bibcode=2017ApJ...847L...6C |doi-access=free }} The analysis of the more extensive Cosmicflows-3 catalogue of galaxies revealed the presence of a major basin of repulsion located in the approximate direction of the Cold Spot observed in the map of the Cosmic microwave background temperature fluctuations. It has been hypothetized that this cold spot might be caused by large voids, or supervoids. The discovery of the repeller provides increased evidence of a substantial void or succession of lesser voids, in the Cold Spot directions.
• Discovery of the South Pole Wall (2020).{{cite journal |first1=Daniel|last1=Pomarède|first2=R. Brent|last2=Tully|first3=Romain|last3=Graziani|first4=Hélène|last4=Courtois|first5=Yehuda|last5=Hoffman|first6=Jérémy|last6=Lezmy|s2cid=220425419|title=Cosmicflows-3: The South Pole Wall |arxiv=2007.04414 |date=10 July 2020 |journal=The Astrophysical Journal |volume=897 |number=2 |page=133|doi=10.3847/1538-4357/ab9952 |bibcode=2020ApJ...897..133P |doi-access=free }} The South Pole Wall is a large scale structure observed in the direction of the south celestial pole. With its heart located in the Chamaeleon constellation, this filament embraces the southernmost frontiers of the Laniakea supercluster. It is roughly the same size as the Sloan Great Wall, at half the distance.
• Discovery of Ho'oleilana (2023),{{Cite journal |last1=Tully |first1=R. Brent |last2=Howlett |first2=Cullan |last3=Pomarède |first3=Daniel |date=2023-09-01 |title=Ho'oleilana: An Individual Baryon Acoustic Oscillation? |journal=The Astrophysical Journal |volume=954 |issue=2 |pages=169 |doi=10.3847/1538-4357/aceaf3 |issn=0004-637X|doi-access=free |arxiv=2309.00677 }} a spherical shell-like structure 1 billion light-years in diameter, observed in the distribution of relatively nearby galaxies. This structure is interpreted as the fossil of a Baryon Acoustic Oscillation, produced in the primordial plasma.{{Cite web |last=University of Hawai'i News |date=2023-09-05 |title=Vast bubble of galaxies discovered, given Hawaiian name {{!}} University of Hawaiʻi System News |url=https://www.hawaii.edu/news/2023/09/05/bubble-of-galaxies-hooleilana/ |access-date=2023-10-05 |language=en-US}}{{Cite web |last=The University of Queensland |first=UQ News |date=7 September 2023 |title='Bubble' of galaxies discovery may revolutionise cosmology |url=https://www.uq.edu.au/news/node/135186}}{{Cite web |last=Parks |first=Jake |date=2023-09-08 |title=Giant cosmic bubble of galaxies thought to be relic from early universe {{!}} Astronomy.com |url=https://www.astronomy.com/science/giant-cosmic-bubble-of-galaxies-thought-to-be-relic-from-early-universe/ |access-date=2023-10-05 |website=Astronomy Magazine |language=en-US}}{{Cite web |last=Mann |first=Adam |title=Ho'oleilana, a Billion-Light-Year-Wide Bubble of Galaxies, Astounds Astronomers |url=https://www.scientificamerican.com/article/ho-oleilana-a-billion-light-year-wide-bubble-of-galaxies-astounds-astronomers/ |access-date=2023-10-05 |website=Scientific American |language=en}}{{Cite web |date=2023-09-07 |title=Billion-light-year-wide 'bubble of galaxies' discovered |url=https://www.france24.com/en/live-news/20230907-billion-light-year-wide-bubble-of-galaxies-discovered |access-date=2023-10-05 |website=France 24 |language=en}}{{Cite web |last=Starr |first=Michelle |date=2023-09-07 |title=This Ginormous Bubble of Nearby Galaxies Could Be a Relic of The Big Bang |url=https://www.sciencealert.com/this-ginormous-bubble-of-nearby-galaxies-could-be-a-relic-of-the-big-bang |access-date=2023-10-05 |website=ScienceAlert |language=en-US}}

Cosmography studies published in scientific journals offer maps not only in the form of standard figures, but also in the form of extensive videos and interactive visualizations. Intended primarily for the specialists in the field of cosmology, these video maps turned out to be of interest to the general public.

A collection of such products developed by Pomarède and fellow co-authors aggregated approximately one million views on platforms such as Vimeo, YouTube and Sketchfab:

• "Cosmography of the Local Universe" is a 17 minutes long video exploring the structure of the nearby universe with a particular emphasis on the Great Attractor region, using the data from the Cosmicflows-1 catalogue of galaxies.{{cite web|title=Cosmography of the Local Universe|url=http://irfu.cea.fr/cosmography|publisher=CEA Paris-Saclay University Institutional website|date=2013}} Discover Magazine called it "The Most Amazing Map You’ll See Today (No Matter What Day It Is)";Discover Magazine [https://www.discovermagazine.com/the-sciences/the-most-amazing-map-youll-see-today-no-matter-what-day-it-is "The Most Amazing Map You’ll See Today (No Matter What Day It Is)"] Corey S. Powell, 1 June 2013 "New Science of Cosmography Reveals 3-D Map of the Local Universe" (MIT Technology Review); "Spectacular Cosmographic Maps Chart Galaxies and Superclusters in Local Universe" (Wired); "This video is a trip – through the known universe" (Los Angeles Times); "Astronomers create stunning 3D space maps of Earth’s nearest galaxies" (METRO);{{cite news|title=Astronomers create stunning 3D space maps of Earth's nearest galaxies|first=Mark|last=Molloy| work=METRO| date=15 June 2013 |url=https://metro.co.uk/2013/06/15/astronomers-create-stunning-3d-space-map-of-earths-nearest-galaxies-3842079/}} "Cosmic Cartography: Here Is Your (Local) Universe" (Scientific American).{{cite news|title=Cosmic Cartography: Here Is Your (Local) Universe=|first=Caleb A.|last=Scharf| work=Scientific American| date=17 June 2013 |url=https://blogs.scientificamerican.com/life-unbounded/cosmic-cartography-here-is-your-local-universe}}
• The discovery of Laniakea is described in a Nature Video "Laniakea: Our home supercluster" which collected 7.9 million views [https://www.youtube.com/watch?v=rENyyRwxpHo]. This video uses elements from "Cosmography of the Local Universe" and from the video "The Laniakea Supercluster of galaxies" [http://irfu.cea.fr/laniakea Laniakea: Our Supercluster of Galaxies] that is part of the scientific article.
• "Action Dynamics of the Local Supercluster" [https://sketchfab.com/3d-models/0981969137fc4a2aaef2b4645fc64d10 Action Dynamics of the Local Supercluster - Download Free 3D model by Daniel Pomarède (@pomarede) [0981969]] is presumably the first 4D interactive visualization ever included in a scientific journal article. Published in the Astrophysical Journal [https://doi.org/10.3847/1538-4357/aa9525 Action Dynamics of the Local Supercluster], this interactive animation shows the fully nonlinear gravitationally induced trajectories of a nearly complete set of galaxies, groups, and clusters in the Local Supercluster constructed in a Numerical Action Method (NAM) model constrained by data from the Cosmicflows survey and various distance indicators, with a time evolution running from the past 13.25 billion years to present.
• ‘The Cosmic V-Web" [http://irfu.cea.fr/vweb The Cosmic V-Web] offers both an 11 minutes-long video and a 3D interactive visualization of a map of the Cosmic Web inferred from the analysis of the velocity field, published in The Astrophysical Journal [https://doi.org/10.3847/1538-4357/aa7f78 The Cosmic V-Web].
• "Cosmicflows-3: Cosmography of the Local Void" [https://vimeo.com/326346346 Cosmicflows-3: Cosmography of the Local Void] is an 11 minutes long video map of the Local Void, a large underdense region of the Universe, on the outskirts of which is located our galaxy the Milky Way, and of its relation with other cosmic voids and major overdense neighbors, published in The Astrophysical Journal [https://doi.org/10.3847/1538-4357/ab2597 Cosmicflows-3: Cosmography of the Local Void]
• "The Cold-Spot Repeller" [https://sketchfab.com/3d-models/eab86b438d7d4bef8f11a8011361a61e The Cold-Spot Repeller - Download Free 3D model by Daniel Pomarède (@pomarede) [eab86b4] - Sketchfab] is an interactive visualization mapping the gravitational potential field and flow obtained with the Cosmicflows-3 catalog of galaxies peculiar velocities. Published in the Astrophysical Journal Letters [https://doi.org/10.3847/2041-8213/aa88b2 Cosmicflows-3: Cold Spot Repeller?], it shows the 3D structure of flow diverging from the Cold Spot Repeller and the Dipole Repeller, and converging dominantly on the Shapley Attractor.

• Fleurance Astronomy Festival 2017 [https://www.youtube.com/watch?v=g96E2DWAOzk]
• The Mysteries of the 21st century in Saint-Tropez 2019 [https://www.youtube.com/watch?v=7fJhI4Ml9Fc]
• The Astronomy Week 2016 in Nantes [https://www.san.asso.fr/conferen/aff_conf.php?date=2016-01-22 SAN : Laniakea, notre superamas de galaxies]

• France Culture, La Méthode Scientifique « Cosmos : les métamorphoses du vide » [https://www.franceculture.fr/emissions/la-methode-scientifique/la-methode-scientifique-emission-du-mardi-28-janvier-2020 Cosmos : les métamorphoses du vide]
• France Culture, La Méthode Scientifique « Filaments galactiques, un univers en dentelle » [https://www.franceculture.fr/emissions/la-methode-scientifique/la-methode-scientifique-emission-du-mardi-24-decembre-2019 Filaments galactiques, un univers en dentelle]
• France Inter, La Tête au Carré « Laniakea, un continent de galaxies » [https://www.franceinter.fr/emissions/la-tete-au-carre/la-tete-au-carre-11-septembre-2014 Laniakea, un continent de galaxies du 11 septembre 2014 - France Inter]
• France Inter, La Tête au Carré, La une de la science [https://www.franceinter.fr/emissions/la-tete-au-carre/la-tete-au-carre-31-janvier-2017 Histoire des maladies infectieuses]

{{reflist|30em}}

• Daniel Pomarède on Twitter: [https://twitter.com/danielpomarede]
• Daniel Pomarède on Scholar: [https://scholar.google.fr/citations?hl=fr&user=trHB0qQAAAAJ&view_op=list_works&sortby=pubdate Daniel Pomarède - Google Scholar]
• Daniel Pomarède on the Astrophysics Data System: [https://ui.adsabs.harvard.edu/search/q=pomarede%2C%20daniel&sort=date%20desc%2C%20bibcode%20desc&p_=0 NASA/ADS]
• "Master plan of the universe revealed in new galaxy maps" NBC News (Aug. 11, 2019) [https://www.nbcnews.com/mach/science/master-plan-universe-revealed-new-galaxy-maps-ncna1040936 Master plan of the universe revealed in new galaxy maps] by Corey S. Powell

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Category:French astrophysicists

Category:1971 births

Category:Living people

Category:People associated with CERN