BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Role of large-scale structures in cosmological evolution with mult i-messenger signatures DTSTART;VALUE=DATE-TIME:20260915T150000Z DTEND;VALUE=DATE-TIME:20260915T152500Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31280@indico.ific.uv.es DESCRIPTION:Speakers: Archan S Majumdar (S. N. Bose National Centre for Ba sic Sciences)\nRecent observations have revealed the presence of cosmic st ructures at even very large scales in the Universe. This\, along with cos mological tensions\, motivates re-examination of the standard paradigm of the concordance model based on assumptions of homogeneous matter distribut ion at various cosmological scales. The observed large-scale matter inhomo geneities may possibly impact the background Hubble evolution through the ir backreaction on the cosmological metric. We compute the effects of bac kreaction through the Buchert formalism for averaging on spatial hypersurf aces\, employing various physically motivated ansatzes for multiple-domain cosmic inhomogeneities. The resulting altered Hubble evolution\, when co nfronted with data from various recent observations\, leads to tight const raints on the backreaction models. Remarkably\, our analysis predicts inte resting signatures on various kinds of astronomical signals\, such as the \, (a) red-shift drift\, (b) 21-cm brightness temperature\, and (c) amplit ude of gravitational waves from compact binaries. Moreover\, we show how t he Hubble tension gets alleviated through the obtained best-fit parameters of our backreaction models. \n\n\nReferences:\n[1] Effect of inhomogenei ties on the propagation of gravitational waves from binaries of compact ob jects\, S. S. Pandey\, A. Sarkar\, A. Ali\, A. S. Majumdar\, JCAP 06\, 021 (2022).\n[2] Global 21-cm brightness temperature in viscous dark energy models\, A. Halder\, S. S. Pandey\, A. S. Majumdar\, JCAP 10\, 049 (2022). \n[3] Viscous attenuation of gravitational waves propagating through an i nhomogeneous background\, S. S. Pandey\, A. Sarkar\, A. Ali\, A. S. Majumd ar\, Eur. Phys. J. C 83\, 435 (2023).\n[4] Future deceleration due to bac kreaction in a Universe with multiple inhomogeneous domains\, A. Halder\, S. S. Pandey\, A. S. Majumdar\, JCAP 08\, 064 (2023).\n[5] Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities\, S. S. Pandey\, A. Halder\, A. S. Majumdar\, Phys. Rev. D 110\, 043531 (20 24).\n[6] Constraining the Hubble parameter with the 21-cm brightness tem perature signal in a universe with inhomogeneities\, S. Mukherjee\, S. S. Pandey\, A. S. Majumdar\, Phys. Rev. D 112\, 063520 (2025).\n[7] Optical d epth to reionization in a Universe with multiple inhomogeneous domains\, S . S. Pandey\, Ruchika\, S. Mukherjee\, A. S. Majumdar\, arXiv: 2604.13718 [astro-ph.CO].\n\nhttps://indico.ific.uv.es/event/8160/contributions/31280 / LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31280/ END:VEVENT BEGIN:VEVENT SUMMARY:The Distance Network: a unified analysis of local H0 measurements DTSTART;VALUE=DATE-TIME:20260915T121000Z DTEND;VALUE=DATE-TIME:20260915T125000Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31282@indico.ific.uv.es DESCRIPTION:Speakers: Stefano Casertano (Space Telescope Science Institute )\nThe Distance Network provides a unified\, statistically rigorous framew ork for a robust combined statistical analysis of a broad variety of local measurements of the Hubble constant. This approach provides full error p ropagation\, accounting for commonalities between measurements\, and stati stical tests to identify possible outliers. We obtain an improved determi nation of the Hubble constant\, with a baseline value of 73.50+/-0.81 km/s /Mpc\, over 7 sigma from current Lambda-CDM based estimates. We test many variants that include\, exclude\, or modify various methods\; all yield v alues between 72.5 and 74.0 km/s/Mpc. The algorithm and data are publicall y available and allow the inclusion of future measurements in this framewo rk.\n\nhttps://indico.ific.uv.es/event/8160/contributions/31282/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31282/ END:VEVENT BEGIN:VEVENT SUMMARY:Wising up to CatWISE: using simulation-based inference to measure the cosmic dipole DTSTART;VALUE=DATE-TIME:20260915T141000Z DTEND;VALUE=DATE-TIME:20260915T143500Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31277@indico.ific.uv.es DESCRIPTION:Speakers: Oliver Oayda (The University of Sydney)\nWe apply Si mulation-Based Inference ('SBI') to the cosmic dipole problem for the firs t time\, measuring the distribution of quasar counts over the sky in the i nfrared CatWISE2020 sample. Our SBI-based approach alleviates systematic e ffects arising from the WISE instrument itself and enables direct inferenc e of the sample's dipole. We find a dipole that is twice as large as the C MB expectation but more seriously misaligned with the CMB direction (≈3 σ)\, adding further evidence to the persistent 'dipole tension'. This rem ains a serious challenge for ΛCDM. However\, our result highlights the po wer of SBI at machine-inferring a likelihood function in the presence of d ifficult systematics\, which will make it a natural choice for robust infe rence with new datasets. For example\, in the radio regime\, the Rapid ASK AP Continuum Survey contains a wealth of unexplored information but has po ssible systematics that must be understood before measuring the dipole. SB I will be a natural technique to disentangle the signal from the systemati c\, shedding new light on the dipole tension.\n\nhttps://indico.ific.uv.es /event/8160/contributions/31277/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31277/ END:VEVENT BEGIN:VEVENT SUMMARY:Simulation-based tension quantification of the cosmic dipole anoma ly DTSTART;VALUE=DATE-TIME:20260915T143500Z DTEND;VALUE=DATE-TIME:20260915T150000Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31278@indico.ific.uv.es DESCRIPTION:Speakers: Mali Land-Strykowski (UNIVERSITY OF SYDNEY)\nThe co smic dipole observed in the matter distribution of galaxy surveys consiste ntly disagrees with the kinematic expectation set by the cosmic microwave background\, posing a serious challenge to the Cosmological Principle and the standard model of cosmology. However\, the fidelity of the dipoles we infer rests on our understanding of the systematics present in the surveys . For many systematics\, their analytical effect on the source counts is u nknown\, rendering the likelihood function intractable. We demonstrate tha t Simulation-Based Inference (SBI) is an effective tool for quantifying te nsions between cosmic dipole data sets\, enabling inference when likelihoo ds are intractable. Here\, we apply neural-ratio estimation to the cosmic dipole for the first time\, recovering tensions between Planck\, NVSS\, RA CS\, and CatWISE under different treatments of systematics. Our SBI archit ecture provides a robust machinery for future dipole analyses with LSST\, Euclid\, and the SKA\, where it will be essential to model complex observa tional systematics.\n\nhttps://indico.ific.uv.es/event/8160/contributions/ 31278/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31278/ END:VEVENT BEGIN:VEVENT SUMMARY:Beyond LCDM with future surveys: Rubin LSST\, SKAO and Simons Obse rvatory DTSTART;VALUE=DATE-TIME:20260915T134500Z DTEND;VALUE=DATE-TIME:20260915T141000Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31279@indico.ific.uv.es DESCRIPTION:Speakers: Chandra Shekhar Saraf (Korea Astronomy and Space Sci ence Institute)\nRecent results from the Dark Energy Spectroscopic Instrum ent has shifted our understanding about dark energy\, preferring about 2-3 sigma evidence for evolving dark energy. The phantom crossing of the dark energy equation of state has motivated the search of new cosmological mod els. In this talk\, I will discuss how combinations of data from Rubin Obs ervatory LSST\, Simons Observatory and SKAO can assist in better understan ding the nature of dark energy and solutions to cosmological tensions. I w ill present forecasts on Rapid Transition Dark Energy and Early Dark Energ y models\, and discuss the challenges and systematics in different dataset s. Specifically\, I will present which combinations to datasets generate b est constraints on extended models.\n\nhttps://indico.ific.uv.es/event/816 0/contributions/31279/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31279/ END:VEVENT BEGIN:VEVENT SUMMARY:Coffee Break DTSTART;VALUE=DATE-TIME:20260915T131500Z DTEND;VALUE=DATE-TIME:20260915T134500Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31283@indico.ific.uv.es DESCRIPTION:https://indico.ific.uv.es/event/8160/contributions/31283/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31283/ END:VEVENT BEGIN:VEVENT SUMMARY:Convergence in the value of H0 from Type Ia Supernovae DTSTART;VALUE=DATE-TIME:20260915T125000Z DTEND;VALUE=DATE-TIME:20260915T131500Z DTSTAMP;VALUE=DATE-TIME:20260922T142657Z UID:indico-contribution-5699-31281@indico.ific.uv.es DESCRIPTION:Speakers: PIlar Ruiz-Lapuente (Instituto de Física Fundamenta l (CSIC) and ICCUB)\nConvergence in the value of H0 from Type Ia Supernova e\n\n In this talk\, I will review new findings that point towards a\n c oncordant value of the Hubble constant (H0) from data based in\n the SH0 ES collaboration and the Chicago--Carnegie Supernova Project\n using the ''SNe Ia twins method'' and using\, as well\, the common\n ''SNe Ia ligh t curve method''.\n There has been usually a discrepancy in the H0 value given by the\n two collaborations. Here we show that such disagreement sh ould not exist. \n I will present the advancement to convergence in the v alue of H0 and\n the improvements being made in the field.\n\nhttps://ind ico.ific.uv.es/event/8160/contributions/31281/ LOCATION: URL:https://indico.ific.uv.es/event/8160/contributions/31281/ END:VEVENT END:VCALENDAR