A5043445659- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Detector Development and Performance
- Advanced Frequency and Time Standards
- Fluid Dynamics Simulations and Interactions
- Astrophysics and Cosmic Phenomena
- Lattice Boltzmann Simulation Studies
- Scientific Research and Discoveries
- Child and Adolescent Psychosocial and Emotional Development
- Neutrino Physics Research
- Fluid Dynamics and Heat Transfer
- Pulsars and Gravitational Waves Research
- Advanced Thermodynamics and Statistical Mechanics
- Atomic and Molecular Physics
- Radioactive Decay and Measurement Techniques
- Geotechnical Engineering and Underground Structures
- Suicide and Self-Harm Studies
- Attention Deficit Hyperactivity Disorder
- Quantum, superfluid, helium dynamics
- Atmospheric Ozone and Climate
- Advanced Chemical Physics Studies
- Computational Physics and Python Applications
Rutgers, The State University of New Jersey
2025
King's College London
2012-2024
The King's College
2024
King's College Hospital
2024
Queen's University Belfast
2024
Rutherford Appleton Laboratory
2023
Engineering Software Steyr (Austria)
2019-2020
University of Amsterdam
2015-2019
Amsterdam University of the Arts
2019
Keskuslaboratorio
2018
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Several groups have identified an extended excess of gamma rays over the modeled foreground and background emissions towards Galactic center (GC) based on observations with Fermi Large Area Telescope. This emission is compatible in morphology spectrum a telltale sign from dark matter (DM) annihilation. Here, we present critical reassessment DM interpretations GC signal light uncertainties that some us recently outlaid Calore et al. 2014. We find much larger number models fits gamma-ray data...
This document is the final report of ATLAS-CMS Dark Matter Forum, a forum organized by ATLAS and CMS collaborations with participation experts on theories Matter, to select minimal basis set dark matter simplified models that should support design early LHC Run-2 searches. A prioritized, compact benchmark proposed, accompanied studies parameter space these repository generator implementations. also addresses how apply Effective Field Theory formalism for collider searches present results...
We show that the new measurement of effective number neutrinos (Neff) by Planck satellite can be used to set a robust lower bound on mass cold thermal dark matter (MeV). Our limit applies if remains in equilibrium coupling electrons and photons or through interactions with neutrinos, regardless whether annihilation cross-section is s-wave p-wave. To illustrate our bounds we apply them model supersymmetric neutralino annihilating via light mixed left-right handed sneutrino mediator. While...
This document a outlines set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these have when applied searches at LHC, provide number useful expressions reference. The list includes both s-channel t-channel scenarios. For s-channel, spin-0 spin-1 mediations are discussed, also realizations where Higgs particle provides portal between visible sectors. guiding principles underpinning proposed...
Dark matter interacting via the exchange of a light pseudoscalar can induce observable signals in indirect detection experiments and experience large self-interactions while evading strong bounds from direct dark searches. The mediator will however flavour-changing interactions Standard Model, providing promising alternative way to test these models. We investigate detail constraints arising rare meson decays fixed target for different coupling structures between Model fermions. resulting...
Predicting signals in experiments to directly detect dark matter (DM) requires a form for the local DM velocity distribution. Hitherto, standard halo model (SHM), which velocities are isotropic and follow truncated Gaussian law, has performed this job. New data, however, suggest that substantial fraction of our stellar lies strongly radially anisotropic population, ``Gaia sausage.'' Inspired by recent discovery, we introduce an updated model, ${\mathrm{SHM}}^{++}$, includes ``sausage''...
The field of dark matter detection is a highly visible and competitive one. In this paper, we propose recommendations for presenting direct results particularly suited weak-scale searches, although believe the spirit can apply more broadly to searches other candidates, such as very light or axions. To translate experimental data into final published result, collaborations must make series choices in their analysis, ranging from how model astrophysical parameters statistical inferences based...
The effects of astrophysical uncertainties on the exclusion limits at dark matter direct detection experiments are investigated for three scenarios: elastic, momentum dependent, and inelastically scattering matter. We find that varying galactic escape velocity Sun's circular can lead to significant variations in light ($\ensuremath{\lesssim}10\text{ }\text{ }\mathrm{GeV}$) elastic inelastic also calculate using 100 distributions extracted from Via Lactea II GHALO N-body simulations a...
We study the validity of effective field theory (EFT) interpretations monojet searches for dark matter at LHC vector and axial-vector interactions. show that EFT approach is valid when mediator has mass m_med greater than 2.5 TeV. find current limits on contact interaction scale Lambda in apply to theories are perturbative m_DM < 800 GeV. However, all values these theories, width larger mass, so a particle-like interpretation doubtful. Furthermore, consistency with thermal relic density...
We introduce a Minimal Simplified Dark Matter (MSDM) framework to quantitatively characterise dark matter (DM) searches at the LHC. study two MSDM models where DM is Dirac fermion which interacts with vector and axial-vector mediator. The are characterised by four parameters: m , M med g q, mediator masses, couplings quarks respectively. accurately capture full event kinematics, dependence on all masses can be systematically studied. interpretation of mono-jet in this used establish an...
We study the impact of assumed velocity distribution galactic dark matter particles on interpretation results from nuclear recoil detectors. By converting experimental data to variables that make astrophysical unknowns explicit, different experiments can be compared without implicit assumptions concerning halo. extend this framework include annual modulation signal, as well multiple target elements. Recent DAMA, CoGeNT and CRESST-II brought into agreement if is very anisotropic thus allows a...
Dark matter (DM) particles with mass in the sub-GeV range are an attractive alternative to heavier weakly interacting massive particles, but direct detection of such light is challenging. If, however, DM-nucleus scattering leads ionization recoiling atom, resulting electron may be detected even if nuclear recoil unobservable. We demonstrate that including this effect significantly enhances sensitivity DM. Existing experiments set world-leading limits, and future probe cross sections relevant...
Recent work on increasing the effective number of neutrino species (Neff) in early universe has focussed introducing extra relativistic ('dark radiation'). We draw attention to another possibility: a new particle mass ≲10 MeV that remains thermal equilibrium with neutrinos until it becomes non-relativistic increases temperature relative photons. demonstrate this leads value Neff is greater than three and at CMB formation larger BBN. investigate constraints such particles from primordial...
The CDMS-II collaboration has reported 3 events in a Si detector, which are consistent with being nuclear recoils due to scattering of Galactic dark matter particles mass about 8.6 GeV and cross-section on neutrons 2 x 10^-41 cm^2. While previous result from the XENON10 experiment supposedly ruled out such as matter, we find by reanalysing data that this is not case. Some tension remains however upper limit placed XENON100 experiment, independently astrophysical uncertainties concerning...
Previous attempts at explaining the gamma-ray excess near Galactic Center have focused on dark matter annihilating directly into Standard Model particles. This results in a preferred mass of 30--40 GeV (if annihilation is $b$ quarks) or 10 it leptons). Here we show that also consistent with heavier particles; models secluded matter, up to 76 provides good fit data. occurs if first annihilates an on-shell particle subsequently decays particles through portal interaction. generic process works...
Dark matter detectors that utilize liquid xenon have now achieved tonne-scale targets, giving them sensitivity to all flavours of supernova neutrinos via coherent elastic neutrino-nucleus scattering. Considering for the first time a realistic detector model, we simulate expected neutrino signal different progenitor masses and nuclear equations state in existing upcoming dual-phase experiments. We show proportional scintillation (S2) allows clear observation guarantees particularly low energy...
Single-photon atom gradiometry is a powerful experimental technique that can be employed to search for the oscillation of atomic transition energies induced by ultralight scalar dark matter (ULDM). In sub-Hz regime, background expected dominated gravity gradient noise (GGN), which arises as result mass fluctuations around experiment. this work, we model GGN surface Rayleigh waves, and construct likelihood-based analysis consistently folds into sensitivity estimates vertical gradiometers in...
The scattering of neutral particles by an atomic nucleus can lead to electronic ionization and excitation through a process known as the Migdal effect. We revisit improve upon previous calculations effect, using Dirac-Hartree-Fock method calculate wave functions. Our methods do not rely on use dipole approximation, allowing us present robust results for higher nuclear recoil velocities than was previously possible. provide theoretical foundations future measurements effect neutron sources,...
We present the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment aiming at unambiguous observation and study of so-called effect induced by fast-neutron scattering. It is hoped that this elusive atomic process can be exploited to enhance reach direct dark matter search experiments lower masses, but it still lacking experimental confirmation. Our goal detect predicted electron emission which thought accompany nuclear scattering with low, calculable, probability, deploying an...
We show that it is possible for WIMP dark matter to produce a large signal in indirect searches without producing signals elsewhere. illustrate our point by fitting the Fermi-LAT extended galactic gamma-ray excess with simple model of Dirac annihilates primarily into b quarks via pseudoscalar. Current collider constraints are weak while 14 TeV LHC run will constrain limited portion parameter space. No expected additional or at future direct detection experiments. Our results emphasise...