http://cp3.irmp.ucl.ac.be:80/PAI 0_common, 1_CP3, 2_IIHE, 3_Joint-THEP, 4_Antwerpen, 5_PhTh-FI-ULB, 6_IFPA-ULg, Antwerpen, BEL-center, BEL-center_pheno, BEL-center_theory, CP3, IFPA-ULg, IIHE, Joint-THEP, PhTh-FI-ULB, THEP_Leuven, VUB, common Calendar - Oct 2026 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261001&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 1 2026 12:30 PM: PhysTh+seminar+room+%28Building+NO%2C+7th+floor%2C+room+110%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261001&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 1 2026 1:00 PM: Group lunch B5c B5A+or+B5C http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261002&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Fri Oct 2 2026 11:00 AM: <b>Enhanced cosmic structure: not-quite-primordial black holes and early star formation</b><br><b><br></b><br>While density fluctuations are well measured on large scales, the matter power spectrum on small scales remains largely unconstrained. Enhanced primordial overdensities on these scales can collapse at very early times, giving rise to astrophysical objects earlier than in the standard cosmological picture. In this talk, I will explore several consequences of this early collapse, including the formation of supermassive black hole seeds and the first galaxies and star clusters, as well as their impact on cosmological observables such as the CMB power spectrum.<b><br></b> http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261006&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Tue Oct 6 2026 1:00 PM: Enhanced cosmic structure: not-quite-primordial black holes and ea rly star formation http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261007&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 7 2026 1:00 PM: Belgian-Dutch Gravitational Wave Meeting Aula+Magna http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261007&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 7 2026 12:15 PM: http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261008&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 8 2026 1:00 PM: Belgian-Dutch Gravitational Wave Meeting Aula+Magna http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261008&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 8 2026 12:30 PM: PhysTh+seminar+room+%28Building+NO%2C+7th+floor%2C+room+110%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261008&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 8 2026 1:00 PM: Group lunch B5c B5A+or+B5C http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261009&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Fri Oct 9 2026 1:00 PM: Belgian-Dutch Gravitational Wave Meeting Aula+Magna http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261013&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Tue Oct 13 2026 1:00 PM: Fei Huang, "Cosmological Stasis and Its Phenomenological Implicat ions" http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261014&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 14 2026 12:00 PM: http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261014&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 14 2026 12:15 PM: http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261015&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 15 2026 12:30 PM: PhysTh+seminar+room+%28Building+NO%2C+7th+floor%2C+room+110%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261015&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 15 2026 1:00 PM: Group lunch B5c B5A+or+B5C http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261016&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Fri Oct 16 2026 11:00 AM: <b>Dark matter imprints on the diffuse X-ray sky</b><br><b><br></b><br><br>Sub-GeV dark matter particles and primordial black holes represent very different possibilities for the nature of dark matter, yet they can both leave an imprint on the X-ray sky. Electrons and positrons produced by dark matter annihilation or decay, or by Hawking evaporation, can upscatter ambient photons through inverse Compton scattering, generating diffuse Galactic X-ray emission.In this seminar, I will discuss how X-ray observations constrain both scenarios, highlighting the central role of cosmic-ray transport. Diffusion, energy losses and reacceleration shape the predicted signals, determining both the sensitivity of these searches and their main uncertainties. Building on analyses of INTEGRAL and other X-ray datasets, I will present recent results using twenty years of INTEGRAL/IBIS observations. By combining the energy spectrum and spatial distribution of the diffuse emission with physically motivated http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261016&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Fri Oct 16 2026 2:00 PM: IIHE Invited seminar: The Dark Side of the Universe Seen Through ( Strong) Gravitational Lenses G%2F1-G.1.03+-+J.+Sacton+%28Building+G%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261020&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Tue Oct 20 2026 1:00 PM: Thermal Effects of Standard-Model Leptons in the Early Universe http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261021&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 21 2026 12:15 PM: http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261022&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 22 2026 12:30 PM: PhysTh+seminar+room+%28Building+NO%2C+7th+floor%2C+room+110%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261022&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 22 2026 1:00 PM: Group lunch B5c B5A+or+B5C http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261023&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Fri Oct 23 2026 2:00 PM: IIHE Invited seminar: TBD G%2F1-G.1.03+-+J.+Sacton+%28Building+G%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261026&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Mon Oct 26 2026 2:00 PM: <b>Dark matter from phase transitions - phase transitions from dark matter</b>I will present the intriguing interplay between cosmological phase transitions and the out-of-equilibrium production of dark matter. If dark matter is produced non-thermally via non-renormalisable interactions (so-called UV-dominated freeze-in), the resulting abundance depends sensitively on the entire cosmological history. In particular, it can be strongly affected by cosmological first-order phase transition, after which the decaying scalar field transfers its energy density to the SM radiation and dilutes pre-existing particle abundances. I will discuss how this phase-in mechanism introduces a dependence of the final DM abundance on the details of the phase transition, in particular the subsequent equation of state of the universe. Using results from lattice simulations, I will show that the collision of highly-relativistic bubble walls leads to an equation of state that may differ significantly fro http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261027&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Tue Oct 27 2026 10:00 AM: Solvay+room http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261028&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Wed Oct 28 2026 10:00 AM: Solvay+room http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261029&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 29 2026 10:00 AM: Solvay+room http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261029&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 29 2026 12:30 PM: PhysTh+seminar+room+%28Building+NO%2C+7th+floor%2C+room+110%29 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261029&cal=0_common%2C1_CP3%2C2_IIHE%2C3_Joint-THEP%2C4_Antwerpen%2C5_PhTh-FI-ULB%2C6_IFPA-ULg%2CAntwerpen%2CBEL-center%2CBEL-center_pheno%2CBEL-center_theory%2Ccommon%2CCP3%2CIFPA-ULg%2CIIHE%2CJoint-THEP%2CPhTh-FI-ULB%2CTHEP_Leuven%2CVUB Thu Oct 29 2026 1:00 PM: Group lunch B5c B5A+or+B5C