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SUMMARY:Axion Cosmology
DTSTART:20200217T080000Z
DTEND:20200313T160000Z
DTSTAMP:20260608T141500Z
UID:indico-event-4442@indico.ph.tum.de
DESCRIPTION:What’s the nature of dark matter? has become one of the most
  important questions in modern particle physics and cosmology. The QCD axi
 on\, hypothetical particle arising in the Peccei-Quinn-Weinberg-Wilczek 
 “mechanism” to explain the shocking absence of CP violation in the str
 ong interactions (“strong-CP problem”) is one of the leading candidate
 s. Unfortunately\, so far it has received comparatively less attention tha
 n the “weakly-interacting-massive-particles” WIMPs. The QCD axion\, as
  a very weakly interacting and small-mass particle\, behaves in very diffe
 rent ways than a WIMP promising very distinct phenomenology and demanding 
 extraordinarily different experimental searches.\n\nIn the last decade the
 re has been a steady increase in the study of the theory and phenomenology
  of axion dark matter and a parallel interest has grown in the experimenta
 l community. The QCD axion has been generalised to axion-like particles (A
 LPs) and more broadly to weakly-interacting-slim particles (WISPs). Many n
 ew experimental techniques have been proposed and R&D projects have been l
 aunched to test them. With such a strain\, important aspects of the theory
  of axion DM lag behind the experimental developments and will not be read
 y to interpret accurately the results of axion DM searches expected during
  the next decade. Furthermore\, certain ranges of parameter space are curr
 ently untargeted by any realistic experimental technique.\n\nIn this works
 hop we will address the most relevant questions still open today in axion 
 dark matter phenomenology by putting together scientists with the relevant
  expertise.\n\n \n\nThe workshop will concentrate on 5 basic aspects:\n\n
 • Axions radiated from cosmic strings and the axion DM mass.\n\nWe will 
 discuss current simulation techniques and future avenues\, extrapolations 
 to physical values of string tension\, effective tension simulations\, the
  local-string limit ...\n\n• Bose-condensation of Axion DM\; Quantum vs.
  classical behaviour Theoretical description\, phenomenological implicatio
 ns\, like in structure formation\, galactic and subgalactic features...\n\
 n• Small scale behaviour of axion DM: Miniclusters\, Bose stars\n\nWe wi
 ll discuss numerical simulations of minicluster formation\, evolution unti
 l today\, survival in the galaxy\, morphology\, density profiles\, formati
 on of axion stars and axitons\, indirect and direct detection...\n\n• Di
 rect searches for axion DM\n\nWe will focus on DM searches above an below 
 the vanilla haloscope micro-eV masses\, theory\, technical challenges\, fu
 ture investments required\; coupling of multiple cavities\, MADMAX and new
  open resonators\, topological insulators and other novel concepts...\n\n
 • Indirect searches for axion DM\n\nWe will discuss observation of axion
  DM spontaneous/stimulated decay\, targets (compact objects with large B-f
 ields\, quiet dwarf-spheroidals...)\, theory\, astrophysical models\, pote
 ntial reach...\n\n \n\nThe workshop will seek the active collaboration of
  its participants and will foster a multidisciplined environment by combin
 ing theorists\, phenomenologists\, observers and experimentalists to maxim
 ise the awareness of the severe issues and develop new ideas and strategie
 s to tackle the unsolved problems.\n\n \n\n \n\nhttps://indico.ph.tum.de
 /event/4442/
URL:https://indico.ph.tum.de/event/4442/
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