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Markos M. Cueli29/08/2023, 15:00
In recent years, the galaxy-mass cross-correlation has predominantly been probed within weak gravitational lensing via the correlation between foreground positions and background galaxy ellipticities. However, the cross-correlation between the positions of background and foreground galaxies is an alternative observable which, up to now, has been largely overlooked. The corresponding signal is...
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Giovanni Gandolfi29/08/2023, 15:00
Understanding the properties of Dark Matter is one of the most demanding challenges in modern Astrophysics and Cosmology. The Cold Dark Matter paradigm is at variance with some aspects of the observed sub-galactic scale phenomenology, hence several non-standard Dark Matter particle candidates have been considered to solve these issues. In this talk, I present a novel way to constrain and...
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Yan Lai29/08/2023, 15:25
The concordance model of the universe – Lambda Cold Dark Matter (LCDM) model has enjoyed a streak of success in the last twenty years. However, there is still no consensus solution to the mysterious dark matter and dark energy. Furthermore, the measurements of Hubble constant and amplitude of matter fluctuation (σ_8) from early universe are in tension with the measurements from the late...
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Isabelle John (Stockholm University)29/08/2023, 15:25
High-energy cosmic-ray electrons and positrons cool rapidly as they propagate through the Galaxy, due to synchrotron interactions with magnetic fields and inverse-Compton scattering interactions with photons of the interstellar radiation field. Typically, these energy losses have been modelled as a continuous process. However, inverse-Compton scattering is a stochastic process, characterised...
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Chiara Moretti (University of Edinburgh)29/08/2023, 15:50
Stage IV galaxy redshift surveys will sample the large-scale structure of the Universe over unprecedented volumes with high-density tracers, allowing for precise measurements of the clustering statistics. In order to properly exploit the full potential of such data, a robust likelihood pipeline is required, starting with an accurate theoretical prediction of cosmological observables, down to...
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Veronica Lora29/08/2023, 15:50
When falling into a galaxy cluster, galaxies experience the loose of gas due to ram pressure stripping. In particular disk galaxies loose gas from their disks and very large tentacles (in the order of hundreds of kpc) can be formed. Because of the morphology of these stripped galaxies they have received the name jellyfish galaxies. It has been found that star formation is triggered not only in...
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Bohdan Novosyadlyj (Ivan Franko National University of Lviv)29/08/2023, 16:35
We analyze the formation of the redshifted hyperfine structure line 21-cm of hydrogen atoms in Dark Ages at 50≤z≤500 in the different cosmologies. To study its dependence on the values of cosmological parameters and physical conditions in the intergalactic medium, the evolution of the global (sky-averaged) differential brightness temperature in this line was computed in standard and...
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Tanja Petrushevska29/08/2023, 16:35
The searches and observations of supernovae (SNe) have been motivated by the fact that they are exceptionally useful for various astrophysical and cosmological applications. Most prominently, Type Ia SNe (SNe Ia) have been used as distance indicators showing that the expansion rate of the Universe is accelerating. The strong gravitational lensing effect provides another powerful tool and...
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Jaume Zuriaga-Puig29/08/2023, 17:00
We focus on the combined analysis of 5 concentric regions in the Galactic Center (GC), observed by the High Energy Stereoscopic System (HESS) in very high energy gamma-ray spectra, as a possible way to constrain the Dark Matter (DM) density distribution in a radius smaller than 450 pc. Inspired by the multi-TeV DM interpretation of the gamma-ray cut-off, detected by HESS in the inner 15 pc, we...
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Shantanu Desai (IIT Hyderabad)29/08/2023, 17:00
The Indian Pulsar Timing Array Consortium (InPTA) is an Indo-Japanese collaboration which does precision timing of millisecond pulsars with the upgraded Giant Metrewave Radio Telescope (uGMRT) and is part of the International Pulsar timing array since 2021. The InPTA effort stands out with its unique ability to simultaneously monitor IPTA pulsars in the L and P bands using the uGMRT. Our...
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Arianna Favale29/08/2023, 17:25
The direct and inverse cosmic distance ladder methods provide two independent ways of estimating the Hubble constant by means of their calibrators, the absolute magnitude of Supernovae of Type Ia (SNIa), M, and the sound horizon at the baryon-drag epoch, rd. In light of the increasing relevance of the Hubble tension, it is thus of utmost importance to measure them following model-independent...
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Sébastien Comerón29/08/2023, 17:25
According to the LambdaCDM cosmology, present-day galaxies with stellar masses M>10^11 M_sun should contain a sizable fraction of dark matter within their stellar body. Models indicate that in massive early-type galaxies (ETGs) with M~1.5x10^11 Msun dark matter should account for ~15% of the dynamical mass within one effective radius (1 Re) and for ~60% within 5 Re. Most massive ETGs have been...
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Jaime Salcido
Upcoming large-scale structure surveys will measure the matter power spectrum to approximately percent level accuracy with the aim of searching for evidence for new physics beyond the standard model of cosmology. In order to avoid biasing our conclusions, the theoretical predictions need to be at least as accurate as the measurements for a given choice of cosmological parameters. However,...
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Eduardo Schiappucci
The kinematic SZ Sunyaev-Zel’dovich (kSZ) effect is produced by the peculiar motion of electrons in galaxy cluster when they scatter off of cosmic microwave background (CMB) photons. As such, the kSZ effect carries information about the cosmic velocity field on large-scales and the gastrophysics of galaxy clusters, providing potentially powerful tests of gravity and structure formation....
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