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SUMMARY:Marina Cermeno - Novel signatures of leptophilic dark matter from 
 the centre of galaxies - Marina Cermeno
DTSTART:20220311T160000Z
DTEND:20220311T170000Z
UID:TALK168272@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:Dark Matter (DM) constitutes most of the matter in the present
 ly accepted cosmological model for our Universe. However\, despite the inc
 reased sensitivity of experimental searches\, no signal from DM particles 
 has been detected so far.\nConventional indirect searches look for an exce
 ss of photons from DM self-annihilation in high DM density regions but the
 ir polarisation has so far not been explored.\n\nIn this talk\, I will arg
 ue that the photon polarisation is an important feature to understand new 
 physics interactions. In particular\, circular polarisation can be generat
 ed from Beyond the Standard Model interactions if they violate parity and 
 there is an asymmetry in the number of particles which participate in the 
 interaction.\n\nI will consider a simplified model where the DM candidate 
 is a Majorana fermion which interacts with right-handed electrons via a sc
 alar mediator and study photon signatures from high density sources such a
 s the Galactic Centre and the active galactic nuclei of Centaurus A. Parti
 cular stress is given to the possibility of detecting circular polarised s
 ignals from the interaction of DM with high energy electrons\, finding tha
 t the degree of polarization can reach up to values of 90-100%. Taking int
 o account current experimental constraints\, I will estimate the required 
 sensitivity from future experiments to detect this signal.\n\nFinally\, si
 nce the origin of the photons in the GeV-TeV range from Centaurus A is not
  completely clear and an exotic origin is compatible with the observations
 \, I will show that this excess could be explained with signals from DM an
 nihilation.
LOCATION:Potter Room (B1.19)
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