- Irene Valenzuela - A Swampland Review for Cosmologists
- Nils Schöneberg - A Cosmology Review for String Theorists
There are many impacts of string theory on cosmology, both in building consistent theories and in the allowed model space. In particular, the proposed Swampland criteria are at times in stark contrast to the current model-building paradigm that is based on the current cosmological standard model. In this talk I review the impact of these criteria on cosmology with particular focus on inflation and the late-time acceleration of the universe caused by dark energy. I also present the recent work of arXiv:2307.15060 in which the impact of the Swampland criteria on quintessence are thoroughly discussed. I also comment on the aspects of the difficulty of doing a model-independent reconstruction of the quintessence potential and the de-Sitter parameter and the novel consideration of fine-tuning of possible interactions with the electromagnetic field.
- Fernando Quevedo, Danièle Steer - Questions to cosmologists and to string theorists
- Marco Raveri - TBA
Abstract
- Sébastien Renaux-Petel - TBA
Abstract
- Gary Shiu - TBA
Abstract
- Dimitrios Tsimpis - Accelerated expansion in an open universe
In 2210.10813 we constructed time-dependent 10d solutions of type II supergravity of the form (warped) M4 x M6 where M4 is a 4d Friedmann-Lemaître-Robertson-Walker cosmology. It was found that solutions where M4 exhibits transient accelerated expansion in a near-de Sitter state with parametric control of the number of e-foldings are abundant, provided M4 has negative spatial curvature (open-universe cosmology). The same is true of solutions with (semi-)eternal acceleration and solutions with rollercoaster behavior. In 2309.03938 we re-examine these findings from the point of view of an effective 4d theory with an exponential potential e^{-gamma phi}. We revisit the corresponding dynamical system and show that, for an open universe, there exists a stable fixed point P if gamma > sqrt{2}. In addition, cosmological solutions asymptoting to P exhibit accelerated expansion in the various aforementioned fashions (semi-eternal, eternal, transient with parametrically controlled number of e-foldings, or rollercoaster).
- Julien Larena - What do large-scale structure have to tell us about spatial curvature?
In this talk I will review recent constraints obtained on spatial curvature from the analysis of large-scale structure. After presenting some estimators of clustering and their properties, I will show how, combined with purely geometric probes in the late-time universe they can yield some constraints on spatial curvature independent from analyses of the cosmic microwave background.
- David Andriot, Francesco Nitti, Vivian Poulin - Discussion
