Spring workshop on gravity and cosmology

Session

session V

May 29, 2020, 9:05 AM

Jagiellonian University

45. The universe as a quantum gravity condensate and effective cosmological dynamics

Daniele Oriti

5/29/20, 10:00 AM

46. Approximate Killing symmetries in non-perturbative quantum gravity

Marcus Reitz

5/29/20, 10:50 AM

47. Possible observational consequences of Planckian granularity

Alejandro Perez

5/29/20, 11:45 AM

I will argue that discreteness at the Planck scale (naturally expected to arise from quantum gravity) might manifest in the form of minute violations of energy-momentum conservation of the matter degrees of freedom when described in terms of (idealized) smooth fields on a smooth spacetime. In the context of applications to cosmology, such “energy diffusion” from the low energy matter degrees...

48. Disformal transformations in modified teleparallelism

Maria Jose Guzman

5/29/20, 12:35 PM

51. Quantum fate of the BKL scenario

Włodzimierz Piechocki

5/29/20, 2:00 PM

I will present the quantum model of the asymptotic dynamics underlying the Belinski-Khalatnikov-Lifshitz (BKL) scenario. The classical BKL scenario concerns generic singularity of general relativity. The quantum BKL scenario shows that gravitational singularity can be replaced by quantum bounce. I will suggest that quantum general relativity has a good chance to be free from singularities.

49. Stochastic shear in bouncing cosmologies

Julien Grain

5/29/20, 3:20 PM

Bouncing cosmologies is a popular alternative to (or an extension of) primordial inflation. However, the contracting phase preceding the bounce is known to be flawed with a shear instability with important consequences on the fate of the bouncing universe. Depending on the concrete model, this instability could either prevent the bounce to occur or drive the universe in an expanding phase...

50. TBA