Conveners
Dark matter
- Victor Flambaum (University of New South Wales)
Dark matter
- Giorgio Busoni
Dark matter
- Yi Cai
Dark matter
- pyungwon ko (Korea Inst. for Advanced Study (KIAS))
Dark matter
- Robert Foot
Dark matter
- Juan Herrero Garcia (University of Adelaide - CoEPP)
The Large Underground Xenon (LUX) is a dark matter experiment searching for direct evidence of Weakly Interacting Massive
Particles (WIMPs), a favored dark matter candidate. It is a 250 kg active mass dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in USA. The results from the second and final science run with a total of 332 live days of...
The COSINE experiment is a joint collaboration between the KIMS-NaI and the DM-Ice NaI(Tl) experiments to prove or refute DAMA/LIBRA's annual modulation result with the same NaI(Tl) crystals. The first phase of the experiment consisting of ~106 kg of NaI(Tl) crystals and ~2000 liters of liquid scintillator as an active veto has started at the Yangyang underground laboratory in Korea.The...
Despite the overwhelming cosmological evidence for the existence of dark matter, and the considerable effort of the scientific community over decades, there is no evidence for dark matter in terrestrial experiments.
The GPS.DM observatory uses the existing GPS constellation as a 50,000 km-aperture sensor array, analysing the satellite and terrestrial atomic clock data for exotic physics...
Local measurements of Galactic cosmic-ray antiprotons are known to provide constraints on the properties of annihilating cold dark matter (CDM). It is also known that CDM candidates generically lead to the structuring of matter on scales much smaller than typical galaxies. This clustering translates into a very large population of subhalos in galaxies, which induces an enhancement of the...
Dark matter (DM) annihilations have been widely studied as a possible explanation of excess gamma rays from the galactic centre seen by the Fermi-LAT. However, most such models are in conflict with constraints from dwarf spheroidals. Motivated by this tension, in this talk I will show that p-wave annihilating dark matter can easily accommodate both sets of observations due to the lower DM...
Semi-annihilation is a generic feature in dark matter theories with symmetries beyond Z2. We investigate some examples with either single- or multi- component dark sectors where semi-annihilation affects the phenomenology substantially. We also present a systematic tool to study models with semi-annihilation.
We consider the indirect detection signals for models containing a fermionic DM candidate, a dark gauge boson, and a dark Higgs field. Compared with a model containing only a dark matter
candidate and vector mediator, the addition of the scalar provides a mass generation mechanism for the dark sector particles which, in some cases, is required in order to avoid unitarity violation at high...
An excess of gamma rays has been observed at the centre of the Galaxy. While dark matter
annihilation within the Milky Way’s halo has been shown to provide a good fit to the observed excess, evidence has recently arisen to suggest that the excess is emitted by a large number of point sources, such as millisecond pulsars. In this talk I present recent results that investigate gamma rays...
I will present the latest results for global fits to the Higgs portal scalar singlet extended standard model using complementary probes of dark matter. In doing so I will introduce the new global and modular beyond the standard model inference tool (GAMBIT) which is used to achieve these results in a statistically consistent and modular way. I will also demonstrate the flexibility and...
We perform a global study of the effective vector and fermion Higgs portal models of dark matter (DM) using the Global And Modular Beyond-the-Standard-Model Inference Tool (GAMBIT) package. Within the effective field theory (EFT) approach, DM communicates with the Standard Model (SM) Higgs boson via an operator of the form $\mathcal{O}_{\mathrm{DM}} H^\dagger H$. For the fermion models, we...
We analyse the effect of evaporation on Dark Matter in the Sun, considering velocity and momentum suppressed cross sections. We check which best-fit points of 1605.06502 are affected by evaporation.
I will discuss halo-independent tests of direct detection signals that we have derived in recent works. In the first part [1502.03342 (elastic scattering) and 1512.03317 (inelastic)], I will discuss a halo-independent lower bound on the DM capture rate in the Sun from a direct detection signal, with which one can set limits on the branching ratios into different channels from the absence of a...
Low-mass boson dark matter particles produced after Big Bang form classical field and/or topological defects. In contrast to traditional dark matter searches, effects produced by interaction of an ordinary matter with this field and defects may be first power in the underlying interaction strength rather than the second power or higher (which appears in a traditional search for the dark...
We propose new schemes for the direct detection of dark matter and exotic bosons in experiments involving atoms, molecules and ultracold neutrons. Dark matter, which consists of low-mass bosons (such as axions, pseudoscalars or scalars), can readily form an oscillating classical field that survives to reside in the observed galactic dark matter haloes if these particles have sufficiently low...
It is understood that in free bosonic theories, the classical field theory accurately describes the full quantum theory when the occupancy numbers of systems are very large. However, the situation is less understood in interacting theories, especially on time scales longer than the dynamical relaxation time. Recently there have been claims that the quantum theory of dark matter axions deviates...
This talk will be based on two recent preprints:
arXiv:1608.01083
arXiv:1609.02307
We explore a dark matter model extending the standard model particle content by one fermionic SU(2)L triplet and two fermionic SU(2)L quadruplets, leading to a minimal realistic UV-complete model of electroweakly interacting dark matter which interacts with the Higgs doublet at tree level via two kinds of Yukawa couplings. After electroweak symmetry breaking, the physical...
We discuss phenomenology of models extended by introducing
an isospin doublet scalar and a complex singlet scalar.
In such models, the lighter state of mixed neutral scalars can be WIMP candidate.
We point out that some WIMP mass regions are consistent with results of dark matter searches
as well as the limit on the dark matter relic density.
We show that these allowed regions can be...
The relic abundance of the dark matter (DM) particle $d$
is studied in a secluded DM scenario, in which the $d$ number
decreasing process dominantly occurs not through the pair annihilation
of $d$ into the standard model particles, but via the $dd \to mm$
scattering process with a subsequently decaying mediator particle $m$.
It is pointed out that the cosmologically observed relic...
We study the effect of elastic scattering on the non-thermally produced WIMP dark matter and its phenomenological consequences. The non-thermal WIMP becomes important when the reheating temperature is well below the freeze-out temperature. In the usual paradigm, the produced high energetic dark matters are quickly thermalized due to the elastic scattering with background radiations. The relic...
An accurate determination of the local dark matter (DM) density is crucial to interpreting data from direct detection and certain indirect detection experiments, as it is degenerate with the DM-nucleon interaction strength. Here I give an update to our ongoing project to make a determination of the local DM density. Our method uses the positions and velocities of a set of tracer stars...
We explore a two component dark matter model with
a fermion and a scalar. In this scenario the
Standard Model (SM) is extended by a fermion, a scalar and an
additional pseudo-scalar. The fermion component is assumed to have
a global ${\rm U(1)}_{\rm DM}$ symmetry and interacts with the pseudoscalar
via a pseudo-scalar interaction while a Z$_2$ symmetry
is imposed on the other component...
