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SUMMARY:The impact of nearby soil conditions on the MIST global 21-cm expe
 riment
DTSTART;VALUE=DATE-TIME:20261028T182200Z
DTEND;VALUE=DATE-TIME:20261028T182300Z
DTSTAMP;VALUE=DATE-TIME:20261025T193327Z
UID:indico-contribution-3717@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Francis McGee (McGill University)\nGlobal 21-cm expe
 riments are designed to capture the sky-averaged 21-cm signal emitted by n
 eutral hydrogen and use it to probe the conditions present during the earl
 iest epochs of the universe. Other experiments\, such as EDGES and SARAS 3
 \, probe the signal produced during the era of cosmic dawn\; however\, the
 ir reported results are in tension with each other. One proposed explanati
 on for the EDGES feature is systematic effects associated with the finite 
 metal ground plane beneath the antenna.\nThe Mapper of the Intergalactic M
 edium (IGM) Spin Temperature (MIST) is a global 21-cm experiment located i
 n the radio-quiet Canadian High Arctic. MIST is designed to provide an ind
 ependent probe of the cosmic dawn signal without a fixed ground plane\, re
 lying on careful electrical modeling of the soil beneath the antenna. Past
  work for MIST has treated the soil as laterally homogeneous and extending
  infinitely horizontally.\nWe will present an overview of the MIST experim
 ent\, along with results from new simulations focusing on the impact of so
 il surface features on the recovered global signal. Three cases will be ex
 amined: individual rocks on the surface\, a selection of rocks scattered a
 cross the surface\, and undulating soil mimicking smooth Arctic surface co
 nditions. Each case will be examined using soil parameter combinations spa
 nning representative Arctic soil conditions around the antenna.\nThe findi
 ngs presented have applicability beyond the MIST experiment and the global
  21-cm community\, informing more traditional experiments about the behavi
 or of soils beyond the edges of their ground planes.\n\nhttps://nyx.physic
 s.mcgill.ca/event/587/contributions/3717/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3717/
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