Conveners
Parallel session 11 (Quantum Gravity)
- Session convener: Fernando Barbero
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Rita Neves24/07/2024, 16:30
One of the criticisms of the inflationary paradigm is that scales that are observable today were trans-Planckian at the onset of inflation. This questions the validity of standard results regarding the primordial power spectrum. Standard cosmology also ignores pre-inflationary dynamics, since it loses predictability close to the initial singularity. Loop Quantum Cosmology (LQC) is an approach...
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Pelayo V. Calzada (Universidad de Alicante)24/07/2024, 16:45
The quantum nature of matter leads to the exploration of quantum features of the spacetime as a dynamical frame. In this line, the geometry has been theorized to be subject to quantum fluctuations that would constitute a spacetime foam structure at the Planck scale. In this contribution we propose an effective toy model on a Kruskal spacetime to analyze the low-energy effects of the spinfoam...
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LUCIA MENENDEZ-PIDAL DE CRISTINA (University Complutense of Madrid)24/07/2024, 17:00
One of the main motivations for developing a quantum theory of gravity is to resolve classical singularities. In many cosmological models, various quantum gravity theories have successfully replaced the Big Bang singularity with a "big bounce". However, black hole spacetimes have historically received less attention. In this talk, we focus on the Wheeler–DeWitt quantisation of one of the...
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Beatriz Elizaga Navascués (Louisiana State University)24/07/2024, 17:15
Understanding the quantum information aspects of fields in gravitational collapse scenarios remains an open issue to date. Here, we present a conservative QFT study about the entanglement structure of the Hawking effect in evaporating black holes. For this purpose, first we review the known concept of Hawking partners, as being the field modes that are entangled with, and thus purify, the...
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Pedro Baptista (GRIT, CENTRA, IST, University of Lisbon)24/07/2024, 17:30
In quantum field theory particle pairs can be spontaneously excited out of the quantum vacuum by a dynamical spacetime or background. Well-known examples include Hawking radiation by collapsing stars, or particle creation by accelerated mirrors. Although this topic is well-understood from a theoretical viewpoint, only few explicit examples can be calculated in full closed form using analytical...
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