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Dr Obinna Umeh

Research Fellow

  1. 2020
  2. Published

    Multipoles of the relativistic galaxy bispectrum

    Eline M. de Weerd, Chris Clarkson, Sheean Jolicoeur, Professor Roy Maartens & Dr Obinna Cosmas Umeh, 11 May 2020, In : Journal of Cosmology and Astroparticle Physics. 2020, 05, p. 1-36 36 p., 018.

    Research output: Contribution to journalArticle

  3. Published

    Detecting the relativistic galaxy bispectrum

    Professor Roy Maartens, Sheean Jolicoeur, Dr Obinna Cosmas Umeh, Eline M. De Weerd, Chris Clarkson & Stefano Camera, 31 Mar 2020, In : Journal of Cosmology and Astroparticle Physics. 2020, 03, 19 p., 065.

    Research output: Contribution to journalArticle

  4. 2019
  5. Published

    The galaxy bias at second order in general relativity with Non-Gaussian initial conditions

    Dr Obinna Cosmas Umeh & Professor Kazuya Koyama, 16 Dec 2019, In : Journal of Cosmology and Astroparticle Physics. 2019, 12, 21 p., 048.

    Research output: Contribution to journalArticle

  6. Published

    The dipole of the galaxy bispectrum

    Chris Clarkson, Eline M. de Weerd, Sheean Jolicoeur, Professor Roy Maartens & Dr Obinna Cosmas Umeh, Jun 2019, In : Monthly Notices of the Royal Astronomical Society. 486, 1, p. L101-L104

    Research output: Contribution to journalArticle

  7. Published

    General relativistic effects in the galaxy bias at second order

    Dr Obinna Cosmas Umeh, Professor Kazuya Koyama, Professor Roy Maartens, Fabian Schmidt & Chris Clarkson, 13 May 2019, In : Journal of Cosmology and Astroparticle Physics. 05, 19 p., 020.

    Research output: Contribution to journalArticle

  8. Published

    The full-sky angular bispectrum in redshift space

    Enea Di Dio, Ruth Durrer, Professor Roy Maartens, Francesco Montanari & Dr Obinna Cosmas Umeh, 29 Apr 2019, In : Journal of Cosmology and Astroparticle Physics. 04, p. 1-32 32 p., 053.

    Research output: Contribution to journalArticle

  9. Published

    Imprints of local lightcone projection effects on the galaxy bispectrum IV: second-order vector and tensor contributions

    Sheean Jolicoeur, Alireza Allahyari, Chris Clarkson, Julien Larena, Dr Obinna Cosmas Umeh & Professor Roy Maartens, 1 Mar 2019, In : Journal of Cosmology and Astroparticle Physics. 2019, 03, p. 1-17 17 p., 004.

    Research output: Contribution to journalArticle

  10. 2018
  11. Published

    The observed galaxy bispectrum from single-field inflation in the squeezed limit

    Professor Kazuya Koyama, Dr Obinna Cosmas Umeh, Professor Roy Maartens & Daniele Bertacca, 23 Jul 2018, In : Journal of Cosmology and Astroparticle Physics. 2018, 07, 20 p., 050.

    Research output: Contribution to journalArticle

  12. Published

    Imprints of local lightcone projection effects on the galaxy bispectrum. Part III. Relativistic corrections from nonlinear dynamical evolution on large-scales

    Sheean Jolicoeur, Dr Obinna Cosmas Umeh, Professor Roy Maartens & Chris Clarkson, 22 Mar 2018, In : Journal of Cosmology and Astroparticle Physics. 03, 16 p., 036.

    Research output: Contribution to journalArticle

  13. Published

    A scale dependent bias on linear scales: the case for HI intensity mapping at z=1

    Aurélie Pénin, Dr Obinna Cosmas Umeh & Mario Santos, 1 Feb 2018, In : Monthly Notices of the Royal Astronomical Society. 473, 1, p. 4297–4305

    Research output: Contribution to journalArticle

  14. 2017
  15. Published

    Imprints of local lightcone \ projection effects on the galaxy bispectrum. Part II

    Sheean Jolicoeur, Dr Obinna Cosmas Umeh, Professor Roy Maartens & Chris Clarkson, 28 Sep 2017, In : Journal of Cosmology and Astroparticle Physics. 09, p. 1-26 26 p., 040.

    Research output: Contribution to journalArticle

  16. Published

    Imprint of non-linear effects on HI intensity mapping on large scales

    Dr Obinna Cosmas Umeh, 5 Jun 2017, In : Journal of Cosmology and Astroparticle Physics. 2017, 06, 005.

    Research output: Contribution to journalArticle

  17. Published

    A general relativistic signature in the galaxy bispectrum: the local effects of observing on the lightcone

    Dr Obinna Cosmas Umeh, Sheean Jolicoeur, Professor Roy Maartens & Chris Clarkson, 14 Mar 2017, In : Journal of Cosmology and Astroparticle Physics. 03, p. 1-10 11 p., 034.

    Research output: Contribution to journalArticle

  18. 2016
  19. Published

    Nonlinear modulation of the HI power spectrum on ultra-large scales. I

    Dr Obinna Cosmas Umeh, Professor Roy Maartens & Mario Santos, 31 Mar 2016, In : Journal of Cosmology and Astroparticle Physics. 03, 061.

    Research output: Contribution to journalArticle

  20. 2015
  21. Published

    Cosmological evolution of the gravitational entropy of the large-scale structure

    Giovanni Marozzi, Jean-Philippe Uzan, Dr Obinna Cosmas Umeh & Chris Clarkson, 5 Sep 2015, In : General Relativity and Gravitation. 47, 10, 114.

    Research output: Contribution to journalArticle

  22. Published

    Cosmological ensemble and directional averages of observables

    Camille Bonvin, Chris Clarkson, Ruth Durrer, Professor Roy Maartens & Dr Obinna Cosmas Umeh, Jul 2015, In : Journal of Cosmology and Astroparticle Physics. 2015, 7, p. 040 040.

    Research output: Contribution to journalArticle

  23. Published

    Do we care about the distance to the CMB? clarifying the impact of second-order lensing

    Camille Bonvin, Chris Clarkson, Ruth Durrer, Professor Roy Maartens & Dr Obinna Cosmas Umeh, Jun 2015, In : Journal of Cosmology and Astroparticle Physics. 2015, 6, p. 050 050.

    Research output: Contribution to journalArticle

  24. 2014
  25. Published

    What is the distance to the CMB?

    Chris Clarkson, Dr Obinna Cosmas Umeh, Professor Roy Maartens & Ruth Durrer, Nov 2014, In : Journal of Cosmology and Astroparticle Physics. 2014, 11, p. 036 036.

    Research output: Contribution to journalArticle

  26. Published

    Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification: II. derivation

    Dr Obinna Cosmas Umeh, Chris Clarkson & Professor Roy Maartens, 1 Oct 2014, In : Classical and Quantum Gravity. 31, 20, p. 205001 205001.

    Research output: Contribution to journalArticle

  27. Published

    Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification: I. key results

    Dr Obinna Cosmas Umeh, Chris Clarkson & Professor Roy Maartens, 1 Oct 2014, In : Classical and Quantum Gravity. 31, 20, p. 202001 202001.

    Research output: Contribution to journalArticle

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