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:20260802T051641Z UID:cae76030-6f7d-4c10-95cb-d3928c44263a SEQUENCE:1 CREATED:20260522T100754Z DESCRIPTION: The nature of the dark matter sector of the Universe remains unknown\, including the possibility that more than one particle species co ntributes to the observed dark matter abundance. In the first part of my t alk\, I will present a prescription for identifying thermal scenarios with two stable and distinct dark matter components at high-energy lepton coll iders. Such scenarios can lead to characteristic double peaks (or humps) i n the missing energy or missing transverse momentum distributions of the f inal states. Depending on the underlying framework\, these features may ap pear in multilepton or mono-X channels. In the second and third parts of t he talk\, I will discuss scenarios in which dark matter is produced nonthe rmally through BSM mediators. In particular\, I will explore the role of l ight BSM mediators and their implications for cosmological and astrophysic al observations\, focusing on constraints from the effective number of rel ativistic degrees of freedom\, Neff\, during CMB formation\, as well as as trophysical probes such as Supernova (SN) 1987A. LAST-MODIFIED:20260522T100754Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/from-cosmos-to-colliders-un derstanding-dark-matter/ X-ALT-DESC;FMTTYPE=text/html:

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

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

In particular\, I will explore the role of light BSM me diators and their implications for cosmological and astrophysical observat ions\, focusing on constraints from the effective number of relativistic d egrees of freedom\, Neff\, during CMB formation\, as well as astrophysical probes such as Supernova (SN) 1987A.

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