Lucas Lombriser Explained

Lucas Lombriser (born 12 April 1982) is a Swiss National Science Foundation Professor at the Department of Theoretical Physics, University of Geneva.[1] His research is in Theoretical Cosmology, Dark Energy, and Alternative Theories of Gravity. In 2020[2] [3] [4] [5] [6] [7] [8] [9] and 2021[10] [11] [12] Lombriser proposed that the Hubble tension and other discrepancies between cosmological measurements imply significant evidence that we are living in a Hubble Bubble of 250 million light years in diameter which is 20% less dense than the cosmic average and lowers the locally measured cosmic microwave background temperature over its cosmic average. Previously, in 2019, he has proposed a solution to the cosmological constant problem from arguing that Newton's constant varies globally.[13] [14] [15] [16] [17] [18] [19] In 2015 and 2016, Lombriser predicted the measurement of the gravitational wave speed with a neutron star merger and that this would rule out alternative theories of gravity as the cause of the late-time accelerated expansion of our Universe,[20] [21] [22] [23] [24] a prediction that proved true with GW170817. Lombriser is a member of the Romansh-speaking minority in Switzerland.

Education and career

Lombriser did a Master in Physics at ETH Zurich in 2008 and completed his PhD at the Institute for Theoretical Physics, University of Zurich in 2011. His thesis advisor was Uroš Seljak.[25] Lombriser did postdoctoral research at the Institute of Cosmology and Gravitation, University of Portsmouth and the Institute of Astronomy, Royal Observatory Edinburgh, University of Edinburgh. He joined the Department of Theoretical Physics, University of Geneva in January 2018 on a Swiss National Science Foundation Professorship.

He is an Affiliate Member of the Higgs Centre for Theoretical Physics, University of Edinburgh.[26]

Research

Lombriser's research is in Theoretical Cosmology, Dark Energy, and Alternative Theories of Gravity. In 2010 he was part of a research group that succeeded in making the first measurement of the

EG

quantity, a model-independent estimator for gravitational interactions at cosmological distances.[27] [28] In 2015 and 2016, Lombriser predicted the measurement of the gravitational wave speed with a neutron star merger and that this would rule out alternative theories of gravity as the cause of the late-time accelerated expansion of our Universe. This prediction and its implications became reality with GW170817. In 2019, he proposed the additional global variation of the General Relativistic Einstein-Hilbert action with respect to Newton's constant. This leads to a constraint equation upon Einstein's field equations which, after evaluation over the observable Universe, provides a solution to the decades-old cosmological constant problem. In March 2020 Lombriser proposed that the much-debated Hubble tension implies significant evidence that we are living in a Hubble Bubble that is 250 million light years in diameter and is 20% less dense than the cosmic average. In April 2021 his team showed that this results in a higher cosmic microwave background temperature than measured locally, which eases further cosmological tensions.

Lombriser is involved in the Euclid space telescope mission of the European Space Agency (ESA) and the Euclid Consortium. He is also involved in the ESA Laser Interferometer Space Antenna (LISA) gravitational wave observatory.[29] He is the PI of the DeepThought Project.[30]

In June 2023, Lombriser reported an alternative way of interpreting the available scientific data which suggested that the notion of an expanding universe may be more a "mirage" than an actuality.[31] [32]

Media

Lombriser has given several interviews on his research work and life in the Swiss Romansh-speaking media, including TV,[33] radio,[34] and newspaper articles.[35] [36] [37] He has also spoken on BBC Radio Scotland.[38] His research works from 2010, 2016, 2019, 2020, and 2021 have received broad attention by news outlets worldwide.

Notes and References

  1. Web site: Lucas Lombriser | Cosmology and Astroparticle Physics - University of Geneva . cosmology.unige.ch.
  2. Lombriser . Lucas . 2020 . Consistency of the local Hubble constant with the cosmic microwave background . Physics Letters B . 803 . 135303 . 1906.12347 . 2020PhLB..80335303L . 10.1016/j.physletb.2020.135303 . 195750638 . free.
  3. Web site: Solved: The mystery of the expansion of the universe . phys.org.
  4. Web site: swissinfo.ch . S. W. I. . Corporation . a branch of the Swiss Broadcasting . Womöglich leben wir in einer "Hubble-Bubble" . SWI swissinfo.ch.
  5. Web site: Ferreira . Becky . March 11, 2020 . We Actually Live Inside a Huge Bubble in Space, Physicist Proposes .
  6. Web site: March 12, 2020 . ¿Resuelto el misterio de la velocidad de expansión del Universo? . abc.
  7. Web site: red . science ORF at/Agenturen . March 11, 2020 . Leben wir in einer "Hubble-Bubble"? . science.ORF.at.
  8. Web site: Is our galaxy in a cosmic 'bubble?' . RT America youtube.
  9. Web site: Best of Last Year: The top Phys.org articles of 2020 . phys.org.
  10. News: 25 May 2021 . L'univers serait plus chaud qu'on croyait . Le Matin .
  11. Web site: Expansion des Universums: "Simple Theorie" löst Diskrepanz bei Hubble-Konstante . heise.de.
  12. Web site: June 2021 . L'Univers serait plus chaud que prévu . sciencesetavenir.fr.
  13. Lombriser . Lucas . 2019 . On the cosmological constant problem . Physics Letters B . 797 . 134804 . 1901.08588 . 2019PhLB..79734804L . 10.1016/j.physletb.2019.134804 . 119274583 . free.
  14. Web site: Providing a solution to the worst-ever prediction in physics . phys.org.
  15. Web site: Lea . Robert . September 10, 2019 . Tackling Cosmological Constant Problem with a new approach . Medium.
  16. Web site: Childers . Tim . 6 September 2019 . 'Einstein's Biggest Blunder' May Have Finally Been Fixed . livescience.com.
  17. Web site: September 1, 2019 . Una solución para la peor predicción de la historia de la Física . abc.
  18. Web site: September 11, 2019 . El error más grave de Einstein puede que haya sido al fin resuelto . El Confidencial.
  19. Web site: 3 March 2021 . A new generation takes on the cosmological constant problem . Physics World.
  20. Lombriser . Lucas . Taylor . Andy . 2016 . Breaking a dark degeneracy with gravitational waves . Journal of Cosmology and Astroparticle Physics . 2016 . 3 . 031 . 1509.08458 . 2016JCAP...03..031L . 10.1088/1475-7516/2016/03/031 . 73517974.
  21. Lombriser . Lucas . Lima . Lima . 2017 . Challenges to self-acceleration in modified gravity from gravitational waves and large-scale structure . Physics Letters B . 765 . 382–385 . 1602.07670 . 2017PhLB..765..382L . 10.1016/j.physletb.2016.12.048 . 118486016 . free.
  22. Web site: 26 September 2017 . Challenges to Cosmic Self Acceleration in Modified Gravity from Gravitational Waves and Large-Scale Structure . . IPhT-TV.
  23. Web site: Rzetelny . Xaq . February 25, 2017 . Theoretical battle: dark energy vs. modified gravity . Ars Technica.
  24. Web site: Quest to settle riddle over Einstein's theory may soon be over . phys.org.
  25. Web site: Lucas Lombriser - The Mathematics Genealogy Project. www.genealogy.math.ndsu.nodak.edu.
  26. Web site: Higgs Centre for Theoretical Physics. higgs.ph.ed.ac.uk.
  27. Reyes. Reinabelle. Mandelbaum. Rachel. Seljak. Uroš. Baldauf. Tobias. Gunn. James. Lombriser. Lucas. Smith. Robert. 2010. Confirmation of general relativity on large scales from weak lensing and galaxy velocities. Nature. 464. 7286. 256–258. 10.1038/nature08857. 20220843. 1003.2185. 2010Natur.464..256R. 205219902.
  28. Web site: Ein weiterer Triumph für Einstein | NZZ. Neue Zürcher Zeitung.
  29. Web site: lombriser | Lisamission.org. www.elisascience.org.
  30. Web site: The DeepThought β Collaboration. deepthought-beta.net.
  31. News: Lea . Robert . The expansion of the universe could be a mirage, new theoretical study suggests - New research looking at the cosmological constant problem suggests the expansion of the universe could be an illusion. . 20 June 2023 . . live . https://archive.today/20230620205854/https://www.livescience.com/physics-mathematics/dark-energy/the-expansion-of-the-universe-could-be-a-mirage-new-theoretical-study-suggests . 20 June 2023 . 20 June 2023 .
  32. Lombriser . Lucas . Lucas Lombriser . Cosmology in Minkowski space . 2 June 2023 . Classical and Quantum Gravity. 10.1088/1361-6382/acdb41 . live . https://archive.today/20230620211220/https://iopscience.iop.org/article/10.1088/1361-6382/acdb41 . 20 June 2023 . 20 June 2023 . 2306.16868 .
  33. Web site: Lucas Lombriser cumprova teoria da Einstein - TV. Play RTR.
  34. Web site: Bunura: Lucas Lombriser e la cosmologia - Radio. Play RTR.
  35. Web site: In skywalker da la scienza perscrutescha undas da gravitaziun, La Quotidiana, 2 October 2017.
  36. Astrofisicher Lucas Lombriser, La Quotidiana, 4 June 2018
  37. Web site: Cosmologia - In sguard en la vita da l'astrofisicher Lucas Lombriser. December 10, 2019. Radiotelevisiun Svizra Rumantscha (RTR).
  38. Web site: BBC Radio Scotland - Newsdrive - Available now. BBC.

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