Searching for low mass dark matter via phonon creation in superfluid 4He
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Searching for low mass dark matter via phonon creation in superfluid 4He. / Baym, Gordon; Beck, D. H.; Filippini, Jeffrey P.; Pethick, C. J.; Shelton, Jessie.
I: Physical Review D, Bind 102, Nr. 3, 035014, 11.08.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Searching for low mass dark matter via phonon creation in superfluid 4He
AU - Baym, Gordon
AU - Beck, D. H.
AU - Filippini, Jeffrey P.
AU - Pethick, C. J.
AU - Shelton, Jessie
PY - 2020/8/11
Y1 - 2020/8/11
N2 - We consider the scattering of dark matter particles from superfluid liquid He-4, which has been proposed as a target for their direct detection. Focusing on dark matter masses below similar to 1 MeV, we demonstrate from sum-rule arguments the importance of the production of single phonons with energies. omega less than or similar to 1 meV. We show further that the anomalous dispersion of phonons in liquid He-4 at low pressures [i.e., d(2)omega(q)/dq(2) > 0, where q and omega(q) are the phonon momentum and energy] has the important consequence that a single phonon will decay over a relatively short distance into a shower of lower-energy phonons centered on the direction of the original phonon. Thus, the experimental challenge in this regime is to detect a shower of low-energy phonons, not just a single phonon. Additional information from the distribution of phonons in such a shower could enhance the determination of the dark matter mass.
AB - We consider the scattering of dark matter particles from superfluid liquid He-4, which has been proposed as a target for their direct detection. Focusing on dark matter masses below similar to 1 MeV, we demonstrate from sum-rule arguments the importance of the production of single phonons with energies. omega less than or similar to 1 meV. We show further that the anomalous dispersion of phonons in liquid He-4 at low pressures [i.e., d(2)omega(q)/dq(2) > 0, where q and omega(q) are the phonon momentum and energy] has the important consequence that a single phonon will decay over a relatively short distance into a shower of lower-energy phonons centered on the direction of the original phonon. Thus, the experimental challenge in this regime is to detect a shower of low-energy phonons, not just a single phonon. Additional information from the distribution of phonons in such a shower could enhance the determination of the dark matter mass.
KW - THERMAL-CONDUCTIVITY
KW - LIQUID-HE-4
KW - DISPERSION
KW - SCATTERING
KW - TRANSPORT
KW - SPECTRUM
U2 - 10.1103/PhysRevD.102.035014
DO - 10.1103/PhysRevD.102.035014
M3 - Journal article
VL - 102
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 3
M1 - 035014
ER -
ID: 247493911