Colloquium APC

GW190521 and alike: what can we learn from multi-band observations

Stas Babak (APC), 11am on zoom

In this talk I introduce GW event GW190521 and describe its properties. 
Then I will assume its association with the optical flare observed by the Zwicky Transient 
Facility in an Active Galactic Nucleus (AGN). After giving some plausible explanation of this association, 
I will move to possibility observing GW190521-like event(s) with LISA. LISA should detect few tens 
of stellar-mass black hole binaries few years before the 3rd generation of ground-based GW 

Quantum gravity Induced Entanglement of Masses (QGEM) protocol

Understanding gravity in the framework of quantum mechanics is one of the great challenges in modern physics. Along this line, a prime question is to find whether gravity is a quantum entity subject to the rules of quantum mechanics. It is fair to say that there are no feasible ideas yet to test the quantum coherent behaviour of gravity directly in a laboratory experiment. Here, I will introduce an idea for such a test based on the principle that two objects cannot be entangled without a quantum mediator.

CPT-Symmetric Universe

After reviewing the notion of CPT symmetry, I will introduceourproposal that the state of the universe does *not* spontaneously violate CPT.Instead, the universe after the big bang is the CPT image of the universebefore it, both classically and quantum mechanically. The pre- and post-bangepochs may be thought of as a universe/anti-universe pair, emerging fromnothing directly into a hot, radiation-dominated era.

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 

Dark Energy from Planck to Euclid: degeneracies in the dark sector

We are happy to welcome Valeria Pettorino (CosmoStat, CEA Paris-Saclay) for our colloquium next week. Valeria will talk about "Dark Energy from Planck to Euclid: degeneracies in the dark sector”  in Amphi PGG on Friday, March 6th at 11am. 

You are welcome to distribute this announcement to anyone who might be interested!

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

—————————

Title: Long- and Short-Baseline Neutrino Oscillation Experiments  

Colloquium APC