Zobrazeno 1 - 10
of 95
pro vyhledávání: '"Graziani, Romain"'
The problem of the reconstruction of the large scale density and velocity fields from peculiar velocities surveys is addressed here within a Bayesian framework by means of Hamiltonian Monte Carlo (HMC) sampling. The HAmiltonian Monte carlo reconstruc
Externí odkaz:
http://arxiv.org/abs/2203.02369
Autor:
Pomarede, Daniel, Tully, R. Brent, Graziani, Romain, Courtois, Helene M., Hoffman, Y., Lezmy, Jeremy
Velocity and density field reconstructions of the volume of the universe within 0.05c derived from the Cosmicflows-3 catalog of galaxy distances has revealed the presence of a filamentary structure extending across ~ 0.11c. The structure, at a charac
Externí odkaz:
http://arxiv.org/abs/2007.04414
Secular extragalactic parallax caused by the solar system's velocity relative to the cosmic microwave background rest frame may be observable as a dipole proper motion field with amplitude $78~\mu$as yr$^{-1}$ Mpc. Nearby galaxies also exhibit proper
Externí odkaz:
http://arxiv.org/abs/1912.11935
Autor:
Kourkchi, Ehsan, Courtois, Helene M., Graziani, Romain, Hoffman, Yehuda, Pomarede, Daniel, Shaya, Edward J., Tully, R. Brent
Publikováno v:
2020, AJ, 159, 67
Tools are provided at the Extragalactic Distance Database website that provide relationships between the distances and velocities of galaxies based on smoothed versions of the velocity fields derived by the Cosmicflows program.
Comment: 10 pages
Comment: 10 pages
Externí odkaz:
http://arxiv.org/abs/1912.07214
Autor:
Graziani, Romain
Le modèle de concordance de la cosmologie moderne repose entre autre sur l'existence de matière dite « noire », matière qui n'intéragirait que gravitationellement et qui ne peut donc pas être observée directement. Les vitesses particulières
Externí odkaz:
http://www.theses.fr/2018LYSE1143/document
Autor:
Courtois, Helene M., Kraan-Korteweg, Renee. C., Dupuy, Alexandra, Graziani, Romain, Libeskind, Noam I
The universe region obscured by the Milky Way is very large and only future blind large HI redshift, and targeted peculiar surveys on the outer borders will determine how much mass is hidden there. Meanwhile, we apply for the first time two independe
Externí odkaz:
http://arxiv.org/abs/1909.08875
Autor:
Tully, R Brent, Pomarede, Daniel, Graziani, Romain, Courtois, Helene M, Hoffman, Yehuda, Shaya, Edward J
Cosmicflows-3 distances and inferred peculiar velocities of galaxies have permitted the reconstruction of the structure of over and under densities within the volume extending to 0.05c. This study focuses on the under dense regions, particularly the
Externí odkaz:
http://arxiv.org/abs/1905.08329
Publikováno v:
Ideology of Power and Power of Ideology in Early China. 124:155-180
