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SUMMARY:The Earth as a transducer for dark-photon dark-matter detection
DTSTART;VALUE=DATE-TIME:20210830T154000Z
DTEND;VALUE=DATE-TIME:20210830T155500Z
DTSTAMP;VALUE=DATE-TIME:20260315T175637Z
UID:indico-contribution-15802@indico.ific.uv.es
DESCRIPTION:Speakers: Saarik Kalia (Stanford University)\nIn this talk\, I
  will propose the use of the Earth as a transducer for ultralight dark-mat
 ter detection.  In particular I will point out a novel signal of kinetical
 ly mixed dark-photon dark matter: a monochromatic oscillating magnetic fie
 ld generated at the surface of the Earth.  Similar to the signal in a labo
 ratory experiment in a shielded box (or cavity)\, this signal arises becau
 se the lower atmosphere is a low-conductivity air gap sandwiched between t
 he highly conductive interior of the Earth below and ionosphere or interpl
 anetary medium above.  At low masses (frequencies) the signal in a laborat
 ory detector is usually suppressed by the size of the detector multiplied 
 by the dark-matter mass.  Crucially\, in our case the suppression is by th
 e radius of the Earth\, and not by the (much smaller) height of the atmosp
 here.  The magnetic field signal exhibits a global vectorial pattern that 
 is spatially coherent across the Earth\, which enables sensitive searches 
 for this signal using unshielded magnetometers dispersed over the surface 
 of the Earth.  I will summarize the results of such a search using a publi
 cly available dataset from the SuperMAG collaboration.  The constraints fr
 om this search are complementary to existing astrophysical bounds.  Future
  searches for this signal may improve the sensitivity over a wide range of
  ultralight dark-matter candidates and masses.\n\nhttps://indico.ific.uv.e
 s/event/6178/contributions/15802/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15802/
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