Colloquium APC

Active Galactic Nuclei: fueling and feedback

Dynamical mechanisms are essential to exchange angular momentum in galaxies, 
drive the gas to the center, and fuel the central super-massive black holes. 
While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent observations 
reaching 10pc scale, or 60mas with ALMA, have revealed, within the sphere of influence
of the black hole, smoking gun evidence of fueling. Observations of AGN feedback 
will be described, together with the suspected responsible mechanisms. Molecular 

APC colloquium

Dear all,

We are very happy to welcome Andrzej M. Szelc (Royal Society University Research Fellow, the University of Manchester) at APC this week.

Andrzej will talk about the "Long- and Short-Baseline Neutrino Oscillation Experiments” (abstract and poster below) in Amphi PGG on Friday, February 7th at 11am.

Vincent and Josquin

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Title: Long- and Short-Baseline Neutrino Oscillation Experiments  

DESI, unraveling dark energy

I will present the stage-IV Dark Energy Spectroscopic Instrument (DESI). The scientific goals of DESI on dark energy, redshift space distortions and constraints on inflation or neutrino mass will be compared to current measurements and limits set by ongoing experiments, in particular by the SDSS BOSS and eBOSS projects. I will illustrate the construction status of DESI, which is nearing completion, and give the timeline of the five-year survey. The project has successfully observed its first spectroscopic light and is now under commissioning.

Colloquium APC

GWTC-1: First LIGO/Virgo Gravitational-Wave Transient Catalog

Abstract: After the end of the O2 observing run, the LIGO and Virgo data were reprocessed and reanalyzed delivering the final O1 and O2 results. We will discuss the content of the catalog consisting of 10 BBH merger signals (4 of which are new discoveries) and one BNS merger signal (arXiv:1811.12907). We will also report the results of the companion article devoted to the astrophysical rates and parameters of the previously not known stellar-mass BH population (arXiv:1811.12940).

Colloquium APC : Concordance of the Dirac-Milne Universe

Concordance of the Dirac-Milne universe

Abstract:
« The Dirac-Milne universe, a matter-antimatter universe where antimatter
has a negative gravitational mass, presents several elements
of concordance with our universe, except apparently for two tests:
primordial helium-3, and BAO, at least if the latter is interpreted in a
conventional way.
After a discussion on the definition of a negative mass particle,
I will describe the formation of structures in the Dirac-Milne universe,

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