Conveners
Dark matter
- Theresa Fruth (University of Sydney)
Dark matter
- Sara DIGLIO (SUBATECH/CNRS/In2p3)
Dark matter
- Giorgio Busoni (The Australian National University)
Dark matter
- Michael Klasen
Dark matter
- Peter Cox (The University of Melbourne)
Dark matter
- Ankit Beniwal (King’s College London)
Dark matter is still one of the greatest mysteries of the Universe. The detection and the properties of dark matter particles, which make up about 86% of the mass of our Universe, are still elusive. LUX-ZEPLIN (LZ) is a direct detection dark matter experiment located at the 4850 ft. level of the Sanford Underground Research Facility in Lead, South Dakota, United States. The LZ experiment...
One of the open questions in modern physics today concerns the nature of Dark Matter (DM). The XENONnT experiment, the successor of XENON1T, is the latest of the XENON project primarily conceived for DM direct detection and it is currently taking data for the second science run at the underground Laboratori Nazionali del Gran Sasso, in Italy. It consists in a dual-phase time projection...
Results of various WIMP direct dark matter searches using full data set of XMASS-I are reported. The XMASS-I is multi-purpose experiment using single phase liquid xenon at the Kamioka Observatory (2700 m.w.e.) in Japan. Stable XMASS-I data taking accumulated a total live time of 1590.9 days between Nov. 20, 2013 and Feb. 1, 2019.
The analysis thrshold was 1.0 keV (for electron recoil) for...
Shedding light on the nature of dark matter and studying properties of neutrinos are among the main priorities of modern particle and astroparticle physics today. Worldwide, numerous direct detection experiments are prepared to observe rare signals induced by dark matter candidates and neutrinos in ultra-sensitive, low-background detectors. One of the leading technologies today are Liquid...
Dual-phase noble liquid Time Projection Chambers (TPCs) and single-phase scintillation-only detectors offer competitive ways to search for dark matter directly via elastically scattering off of detector target nuclei and electrons. Argon possesses an intrinsic property allowing for powerful discrimination between electron (background) and nuclear (signal) recoils. The Global Argon Dark...
To the date, the only positive signal of presence of dark matter (DM) in the Milky Way halo by direct observation of its interaction with a detector comes from the DAMA/LIBRA experiment in the Gran Sasso National Laboratory (LNGS). For more than 20 years it has observed an annual modulation in the low energy counting rate compatible with that expected due to the rotation of the Earth around...
The COSINUS experiment (Cryogenic Observatory for SIgnals seen in Next generation Underground Searches) is a low-threshold, cryogenic experiment being set up at Laboratori Nazionali Del Gran Sasso, Italy. It aims to provide a model independent cross-check of the DAMA/LIBRA findings of a potential dark-matter like modulating signal.
COSINUS utilizes a two-channel...
For nearly two decades the DAMA Collaboration has been observing a modulating signal compatible with that expected from a dark matter presence in our galaxy. However, interpretations of this with the standard assumptions for dark matter particles are strongly ruled out by a large number of other experiments. This tension can be relaxed somewhat by making more tailored choices for the dark...
The aim of the SABRE (Sodium-iodide with Active Background REjection) experiment is to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. The scientific program includes the deployment of two separate detectors: SABRE South located at the Stawell Undergrond...
The DAMA experiments have detected a modulating signal compatible with dark matter for 20 years with a combined significance of 12.9~$\sigma$. A result in tension for a spin independent WIMP with null results from large noble gas experiments. This is the motivation for SABRE (Sodium iodide with Active Background Rejection) South experiment. A NaI(Tl) based replication studies of the DAMA...
As dark matter detectors continue to probe into increasingly lower mass and cross-section regions of the phase space for Weakly Interacting Massive Particles (WIMPs), coherent scattering of solar neutrinos from the neutrino floor (increasingly termed the ‘neutrino fog’ [1]), will pose an irreducible background that needs to be overcome. Directional detectors such as gaseous time projection...
The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. We revisit and improve upon previous calculations of the Migdal effect, providing accurate predictions for large nuclear recoil velocities and demonstrating the importance of multiple ionisation. Our calculations provide the theoretical...
The search for light dark matter (with a mass below a GeV) is entering an exciting phase. New experiments based on light dark matter interactions with collective modes in various types of condensed matter systems will probe pristine parameter space. Alongside this, new calculational techniques, particularly employing the use of effective field theory, are being developed to accurately describe...
The Scintillating Bubble Chamber (SBC) collaboration in developing physics-capable noble-liquid bubble chambers with potential physics reach in the search for GeV-scale dark matter, as well as in detecting reactor neutrino CEvNS. A small-scale liquid xenon prototype has demonstrated the potential of this technique to detect sub-keV nuclear recoils while remaining effectively electron-recoil...
We introduce a new dark-matter detection experiment that will enable the search of keV-range super-light dark matter, representing an improvement of the minimum detectable mass by more than three orders of magnitude over the ongoing experiments. This is possible by integrating intimately the target material, π-bond electrons in graphene, into a Josephson junction to achieve a high sensitivity...
Precision calculations can impact the parameter space of well motivated dark matter models significantly. In this talk I will discuss the impact of loop calculations, Sommerfeld enhancement and bound state formation effects for t channel dark matter models. I will demonstrate that the combined effect of precision calculations has a significant impact in constraining as well as opening up new...
In the standard approach, theoretical predictions of the dark matter relic abundance for freeze-out scenarios are performed by only using (effective) tree-level annihilation cross sections as input for the 0-moment of the Boltzmann equation, i.e. the number density equation. To allow for the future automatization of next-to-leading order calculations to the relic density, we present a general...
Dark matter candidates can arise from a wide range of extensions to the Standard Model. Simplified models with a small number of new particles allow for the optimisation and interpretation of dark matter and collider experiments, without the need for a UV-complete theory. In this talk, I will discuss the results from a recent GAMBIT study of global constraints on vector-mediated simplified...
We present a class of composite dark matter models with matter fields in a real representation under the non abelian gauge group. As an exemplary theory we present an Sp(4) gauge theory, with fermions transforming in the antisymmetric representation. We analyze the structure of these theories in the UV and discuss the building blocks of the low energy effective theory in the IR, describing the...
Dark matter particles may be represented by compact composite objects of quark matter with macroscopic parameters of mass, charge, and effective temperature. Such particles remain cosmologically and observationally dark if they possess a small cross section to mass ratio. A new feature of the Quark Nugget dark matter model is the prediction of existence of anti-quark nuggets (anti-QNs) built...
Warm and cold dark matter models predict very different abundancies of dark matter substructure within the halos of galaxies. Strong gravitational lensing has shown, in theory, to be a useful probe to measure the parameters of the subhalo mass function which describes these abundancies. In recent years, the focus has been primarily in utilising machine learning to identify substructure...
In this talk, I’ll present results from a global fit of Dirac fermion dark matter (DM) effective field theory using the GAMBIT software. We include operators up to dimension-7 that describe the interactions between gauge-singlet Dirac fermion and Standard Model quarks, gluons, and the photon. Our fit includes the latest constraints from the Planck satellite, direct and indirect detection...
Asymmetric dark matter is generically expected to form compact dark stars, which can be searched for through their strong gravitational effects on the light from background stars or on the dynamics of other celestial objects in their vicinity. In this paper we analyze the possible signatures of compact dark stars in asymmetric dark matter scenarios with a portal to the Standard Model. We argue...
Neutron stars harbour matter under extreme conditions, providing a unique testing ground for fundamental interactions.
Dark matter can be captured by neutron stars via scattering, where kinetic energy is transferred to the star.
This can have a number of observational consequences, such as theheating of old neutron stars to infra-red temperatures.
Previous treatments of the capture process...
The observed value of the muon magnetic dipole moment can be explained in models with weakly-interacting massive particles (WIMPs) coupled to muons. However, a considerable range of parameter space in such models will remain unexplored in future LHC experiments and dark matter (DM) direct searches. Here I will discuss the temperature observation of neutron stars (NSs) as a promising way to...
Dark Matter capture in compact objects has garnered considerable interest over recent years. This renewed interest is driven primarily by the prospect that the energy deposited by the dark matter can heat these objects potentially to infra-red temperatures, which may soon be observed. Such observations can constrain dark matter interactions complementary to modern direct detection experiments....
