ADMX: Recent results at the DFSZ frontier

• David Tanner (University of Florida)

Room: Auditorium The Axion Dark Matter eXperiment (ADMX) is conducting a search for axions trapped in the dark-matter halo of our Galaxy. ADMX employs a large-volume superconducting magnet, a high-Q tunable microwave cavity, an ultrasensitive SQUID microwave amplifier, and a high-performance dilution refrigerator to enable temperatures in the 80-200 mK range for cavity and SQUID. In the last year, this "Generation 2" ADMX detector has reached the sensitivity to detect axions even in the case where their coupling to two photons is as weak as the somewhat pessimistic DFSZ theory. The ADMX detector, located at the University of Washington, has completed its first run at this design sensitivity. There were no detections and the search continues with a second science run. The resulting limits on axion mass, the prospects for the ongoing search, and the outlook for the future will be discussed.

Gravitational waves and modified gravity

• Ignacy Sawicki (CEICO, Institute of Physics, Czech Academy of Sciences)

Room: Auditorium I will discuss the implication of the recent measurement by LIGO of the speed of gravitational waves on models of modified gravity, mainly for mechanisms for acceleration but also for alternatives to dark matter. I will discuss the remaining parameter space and the sort of physics we might still expect to see in the upcoming generation of cosmological surveys focused on measuring the properties of the dark sector.

Small scales, big differences: nonlinear structures beyond cold dark matter

• Jens Niemeyer (University of Goettingen)

Room: Auditorium The cold dark matter (CDM) paradigm of gravitational structure formation faces its strongest challenges on small, nonlinear scales where deviations from interactions, initial conditions, or bosonic effects can become pronounced. At the same time, the growing importance of baryons makes a clear identification of beyond-CDM phenomena difficult. I will present a short overview of the existing hints for possible bCDM physics and upcoming opportunities for probing the small-scale structure of dark matter.

Workshop photo Room: In front of the Auditorium

WIMP Searches 2018

• Rafael Lang (Purdue University)

Room: Auditorium This talk will summarize the current status of direct WIMP searches, from old time favorites such as liquid xenon experiments to new ideas which are pushing our technologies into the sub-GeV mass range.

Dark matter axion mass

• Javier Redondo Martin (Zaragoza U / MPP Munich)

Room: Auditorium