BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:From Cosmos to Colliders: Understanding Dark Matter DTSTART:20260526T163000Z DTEND:20260526T180000Z DTSTAMP:20260730T224005Z UID:cae76030-6f7d-4c10-95cb-d3928c44263a SEQUENCE:2 CREATED:20260522T100803Z DESCRIPTION:The nature of the dark matter sector of the Universe remains u nknown\, including the possibility that more than one particle species con tributes to the observed dark matter abundance. In the first part of my ta lk\, I will present a prescription for identifying thermal scenarios with two stable and distinct dark matter components at high-energy lepton colli ders. Such scenarios can lead to characteristic double peaks (or humps) in the missing energy or missing transverse momentum distributions of the fi nal states. Depending on the underlying framework\, these features may app ear in multilepton or mono-X channels. In the second and third parts of th e talk\, I will discuss scenarios in which dark matter is produced nonther mally through BSM mediators. In particular\, I will explore the role of li ght BSM mediators and their implications for cosmological and astrophysica l observations\, focusing on constraints from the effective number of rela tivistic degrees of freedom\, Neff\, during CMB formation\, as well as ast rophysical probes such as Supernova (SN) 1987A. LAST-MODIFIED:20260522T100813Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/from-cosmos-to-colliders-u nderstanding-dark-matter/ X-ALT-DESC;FMTTYPE=text/html:

The nature of the d ark matter sector of the Universe remains unknown\, including the possibil ity that more than one particle species contributes to the observed dark m atter abundance. In the first part of my talk\, I will present a prescript ion for identifying thermal scenarios with two stable and distinct dark ma tter components at high-energy lepton colliders.

Such scenarios can lead to characteristic double peaks (or humps) in the missing energy o r missing transverse momentum distributions of the final states. Depending on the underlying framework\, these features may appear in multilepton or mono-X channels. In the second and third parts of the talk\, I will discu ss scenarios in which dark matter is produced nonthermally through BSM med iators.

In particular\, I will explore the role of light BSM med iators and their implications for cosmological and astrophysical observati ons\, focusing on constraints from the effective number of relativistic de grees of freedom\, Neff\, during CMB formation\, as well as astrophysical probes such as Supernova (SN) 1987A.

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