Conveners
R1-2 Gravity and Cosmology II (DTP) | Gravité et cosmologie II (DPT)
- Randy Lewis
The history of baryonic material, particularly after the epoch of `Cosmic Dawn’ -- the onset of the earliest stars and galaxies -- is widely considered the ‘final frontier’ of cosmological surveys today. The technique of intensity mapping (IM) has emerged as the powerful tool to explore this phase of the Universe by measuring the integrated emission from sources over a broad range of...
Gravity can be described in several fashions. To name a few, we have the Einstein-Hilbert theories, the Palatini theories, and the Holst theories. In this talk, I will make a quick introduction of all of them (both in metric and tetrad variables) and prove their equivalence in the covariant phase space as well as the equivalence of the associated charges. This proof relies on the newly...
We discuss the plausibility of detection of quantum gravity effects in astrophysics, in particular near strong gravitating systems such as black holes. We also comment on the plausibility of finding gravitons, the quanta of gravitational waves.
In a non-local quantum superposition of a massive particle, does the gravitational field behave as the classical superposition of two particles separated by a spatial distance with half the mass located at each position or does the system behave as a quantum superposition with a far more interesting and subtle behaviour? We compute the differential scattering cross-section under the...
We reconsider the thermodynamics of AdS black holes in the context of gauge–gravity duality. In this new setting -- where both the cosmological constant Λ and the gravitational Newton constant G are varied in the bulk -- we rewrite the first law in a new form containing both Λ (associated with thermodynamic pressure) and the central charge C of the dual CFT theory and their conjugate...
