Salvatore Capozziello(Naples U., Italy).
Title. “FOUNDATION AND COSMOLOGICAL APPLICATIONS OF NON-LOCAL GRAVITY IN METRIC AND TELEPARALLEL FORMULATIONS”
Abstract. Recently, the so-called Non-Local Gravity acquired a lot of interest as an effective field theory towards the full Quantum Gravity. In this talk, we sketch its main features, discussing, in particular, possible infrared effects at astrophysical and cosmological scales. In particular, we focus on general non-local actions including curvature invariants like the Ricci scalar and the Gauss-Bonnet topological invariant, in metric formalism, or the torsion scalar, in Teleparallel formalism. In both cases, characteristic lengths emerge at cosmological and astrophysical scales. Furthermore, it is possible to fix the form of the Lagrangian and to study the cosmological evolution considering the existence of Noether symmetries.
Emmanuel Saridakis (Athens National Technical U., Greece).
Title. “TORSIONAL MODIFIED GRAVITIES: CAN GRAVITATIONAL WAVE OBSERVATIONS SERVE AS THEIR SMOKING GUN?”
Abstract. We investigate the effects of various torsional modified gravities on the properties of gravitational waves, and we analyze the possibility of using multi-messenger data as a smoking gun for this class of gravitational theories.
Eleonora Di Valentino (Manchester U., UK).
Title. “COSMIC DISCORDANCES”
Abstract. The Cosmic Microwave Background (CMB) temperature and polarization anisotropy measurements from the Planck mission have provided strong confirmation of the LCDM model of structure formation. However, there are a few interesting tensions with other cosmological probes and anomalies in the data that leave the door open to possible extensions to LCDM. The most famous ones are the Hubble constant and the σ8 parameter tensions, the Alens anomaly and a curvature of the Universe. I will review all of them, showing some interesting extended cosmological scenarios, in order to find a new concordance model that could explain the current cosmological data.
Alessio Spurio-Mancini (U. College London, UK)
Title. “CONSTRAINING DARK ENERGY AND MODIFIED GRAVITY WITH COMBINED LARGE-SCALE STRUCTURE PROBES”
Abstract. One of the main goals of current and future surveys is to combine cosmological probes to constrain dark energy and modified gravity models. In this talk I will demonstrate how weak gravitational lensing and other observables can be applied to achieve this. I will present a combined analysis of weak lensing, galaxy-galaxy lensing and galaxy clustering from the Kilo-Degree Survey (KiDS) and the Galaxy And Mass Assembly (GAMA) survey. This analysis sets constraints on Horndeski gravity, which includes a vast number of dark energy and modified gravity models. I will show how these constraints can be improved with future data from Stage IV surveys, such as Euclid, and discuss some of the challenges these surveys will face.
Diego Rubiera-Garcia (Madrid Complutense U., Spain)
Title. “TESTING MODIFIED GRAVITY WITH NON-RELATIVISTIC STARS”
Abstract. We argue that it is possible to test modified gravity using non-relativistic stars, and illustrate it with the computation of the minimum main-sequence mass in Palatini quadratic f(R) gravity and its comparison with observational data.
Jutta Kunz (Oldenburg U., Germany)
Title. “SCALARIZED BLACK HOLES”
Abstract. Black holes are excellent astrophysical laboratories to test the strong gravity regime and thus the Kerr hypothesis, since alternative theories of gravity may lead to black holes that differ distinctly from those of General Relativity. When adding higher curvature terms to gravity as, for instance, in the form of the Gauss-Bonnet term coupled to a scalar field, scalarized black holes result. Here we discuss several types of scalarization of black holes, including the recently found spin-induced spontaneous scalarization.
José Senovilla (Basque Country U., Spain )
Title. “WOMEN IN PHYSICS (AND MATHEMATICS)”