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X-WR-CALDESC:Évènements pour Institut de Recherche en Astrophysique et Planétologie
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DTSTART;TZID=Europe/Paris:20261008T110000
DTEND;TZID=Europe/Paris:20261008T120000
DTSTAMP:20260921T095343Z
CREATED:20260921T093254Z
LAST-MODIFIED:20260921T095343Z
UID:19638-1791457200-1791460800@www.irap.omp.eu
SUMMARY:Can the Standard Model of Particle Physics Explain Dark Energy?
DESCRIPTION:Ludovic van Waerbake  (U. of British Columbia\, Canada) \n\n\n\n\n\n\n\n\n\nThe discovery of cosmic acceleration established dark energy as one of the central problems in cosmology. In the standard cosmological model\, dark energy is described by a cosmological constant\, yet its extremely small value remains difficult to reconcile with expectations from quantum field theory. Recent DESI results\, combined with other cosmological probes\, suggest that dark energy may evolve with cosmic time. In this talk\, I will first review the observational evidence for dark energy\, what current data tell us about its properties\, and why evolving dark energy is theoretically challenging. I will then discuss the possibility that dark energy may not require a new particle or field\, but could instead emerge from known but overlooked physics within the Standard Model of particle physics.
URL:https://www.irap.omp.eu/event/can-the-standard-model-of-particle-physics-explain-dark-energy/
LOCATION:Salle Lyot – IRAP Belin\, 14 avenue Edouard Belin\, Toulouse\, 31400\, FR
CATEGORIES:Séminaire IRAP
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DTSTART;TZID=Europe/Paris:20261217T110000
DTEND;TZID=Europe/Paris:20261217T120000
DTSTAMP:20260915T074914Z
CREATED:20260915T074913Z
LAST-MODIFIED:20260915T074914Z
UID:19623-1797505200-1797508800@www.irap.omp.eu
SUMMARY:Extreme and Rapid Accretion in Supermassive Black Holes
DESCRIPTION:Claudio Ricci (U. Geneva) \n\n\n\n\n\n\n\n\n\nAccreting supermassive black holes are known to be variable\, changing in brightness across all wavelengths and timescales. In recent years\, a remarkable subset of these Active Galactic Nuclei (AGN) has been discovered to show extreme spectral variability. These changing-look events are thought to arise from extreme and rapid changes in how fast the black hole is feeding\, defying the expected accretion timescales for black holes with masses of millions to billions of solar masses. Such rapid variations provide unique insights into the physics of accretion in supermassive black holes. With the upcoming Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST)\, we expect to uncover thousands of these dramatic transformations\, thanks to its combination of depth and rapid\, repeated imaging of the sky. In this talk\, I will review what we have learned about changing-look AGN so far\, and look ahead to how LSST\, combined with new large-scale spectroscopic surveys such as 4MOST\, will open a new era in our understanding of black hole accretion physics.
URL:https://www.irap.omp.eu/event/extreme-and-rapid-accretion-in-supermassive-black-holes/
LOCATION:Salle de Conférence – IRAP Roche\, 9 avenue du Colonel Roche\, Toulouse\, 31400\, FR
CATEGORIES:Séminaire IRAP
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