Bradley J. Kavanagh
A5006743719- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Relativity and Gravitational Theory
- Black Holes and Theoretical Physics
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Computational Physics and Python Applications
- Cold Atom Physics and Bose-Einstein Condensates
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced Semiconductor Detectors and Materials
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Optical Imaging and Spectroscopy Techniques
Instituto de Física de Cantabria
2020-2025
Universidad de Cantabria
2023-2024
University of Amsterdam
2018-2021
Delta Institute for Theoretical Physics
2018-2021
Centre National de la Recherche Scientifique
2015-2018
Laboratoire de Physique Théorique et Hautes Energies
2016-2018
CEA Paris-Saclay
2015-2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2016
Université Paris Cité
2016
Sorbonne Université
2016
The detection of gravitational waves from mergers tens Solar mass black hole binaries has led to a surge in interest Primordial Black Holes (PBHs) as dark matter candidate. We aim provide (relatively) concise overview the status PBHs candidate, circa Summer 2020. First we review formation early Universe, focusing mainly on formed via collapse large density perturbations generated by inflation. Then various current and future constraints present day abundance PBHs. conclude with discussion...
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...
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
The EDELWEISS collaboration has performed a search for dark matter particles with masses below the GeV-scale 33.4-g germanium cryogenic detector operated in surface lab. energy deposits were measured using neutron-transmutation-doped Ge thermal sensor 17.7~eV (RMS) baseline heat resolution leading to 60~eV analysis threshold. Despite moderate lead shielding and high-background environment, first sub-GeV spin-independent limit based on target been achieved. experiment provides most stringent,...
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about fundamental theory of nature at play in extreme gravity regime, where gravitational interaction is both strong and dynamical. In this white paper, Fundamental Physics Working Group LISA Consortium summarizes current topics physics observations GWs can be expected provide key input. We briefest reviews then delineate avenues for future research directions discuss connections between working group, other...
Large dark matter overdensities can form around black holes of astrophysical and primordial origin as they grow. This ``dark dress'' inevitably affects the dynamical evolution binary systems induces a dephasing in gravitational waveform that be probed with future interferometers. In this paper, we introduce new analytical model to rapidly compute waveforms presence an evolving distribution. We then present Bayesian analysis determining when dressed hole binaries distinguished from...
Abstract The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response Moon gravitational waves (GWs). Given size and expected noise produced by lunar seismic background, LGWA would be able observe GWs from about 1 mHz Hz. This make missing link between space-borne detectors like LISA with peak sensitivities around few millihertz future terrestrial Einstein Telescope or Cosmic Explorer. In this article, we provide first...
The formation of astrophysical and primordial black holes influences the distribution dark matter surrounding them. Black are thus expected to carry a ``dress'' whose properties depend on their mechanism environment. Here we out numerical analytical study merger dressed holes, show that around them dramatically affects dynamical evolution binaries. Although final impact rate is rather small with respect case ``naked'' argue our analysis places calculation this more solid ground, LIGO-Virgo...
A dark matter overdensity around a black hole may significantly alter the dynamics of hole's merger with another compact object. We consider here intermediate mass-ratio inspirals stellar-mass objects intermediate-mass holes "dressed" matter. first demonstrate that previous estimates based on fixed dark-matter dress are unphysical for range binaries and distributions by showing total energy dissipated object through dynamical friction, as it dense environment towards hole, is larger than...
We study direct detection in simplified models of Dark Matter (DM) which interactions with Standard Model (SM) fermions are mediated by a heavy vector boson. consider fully general, gauge-invariant couplings between the SM, mediator and both scalar fermion DM. account for evolution energy scale mass nuclear scale. This running arises from virtual effects SM particles its inclusion is not optional. compare bounds on experiments without accounting running. In some cases these changes several...
In this white paper, we discuss the prospects for characterizing and identifying dark matter using gravitational waves, covering a wide range of candidate types signals. We argue that present upcoming wave probes offer unprecedented opportunities unraveling nature identify most urgent challenges open problems with aim encouraging strong community effort at interface between these two exciting fields research.
In many cosmologies dark matter clusters on subkiloparsec scales and forms compact subhalos, in which the majority of Galactic could reside. Null results direct detection experiments since their advent four decades ago then be result extremely rare encounters between Earth these subhalos. We investigate alternative promising means to identify subhalo interacting with standard model particles: (1) collisions old neutron stars can transfer kinetic energy brighten latter luminosities within...
The EDELWEISS collaboration reports on the search for Dark Matter (DM) particle interactions via Migdal effect with masses between $32$ MeV$\cdot$c$^{-2}$ to $2$ GeV$\cdot$c$^{-2}$ using a $200$ g cryogenic Ge detector sensitive simultaneously heat and ionization signals operated underground at Laboratoire Souterrain de Modane in France. phonon signal was read out Transition Edge Sensor made of NbSi thin film. biased $66$ V order benefit from Neganov-Trofimov-Luke amplification resulting...
Future ground-based gravitational wave observatories will be ideal probes of the environments surrounding black holes with masses $1\ensuremath{-}10{M}_{\ensuremath{\bigodot}}$. Binary hole mergers mass ratios order $q={m}_{2}/{m}_{1}\ensuremath{\lesssim}{10}^{\ensuremath{-}3}$ can remain in frequency band such detectors for months or years, enabling precision searches modifications their waveforms respect to vacuum inspirals. As a concrete example an environmental effect, we consider here...
Dark matter (DM) particles with sufficiently large cross sections may scatter as they travel through Earth’s bulk. The corresponding changes in the DM flux give rise to a characteristic daily modulation signal detectors sensitive DM-electron interactions. Here, we report results obtained from first underground operation of DAMIC-M prototype detector searching for such MeV-scale mass. A model-independent analysis finds no rate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
Direct searches for Dark Matter (DM) are continuously improving, probing down to lower and DM-nucleon interaction cross sections. For strongly-interacting massive particle (SIMP) Matter, however, the accessible section is bounded from above due stopping effect of atmosphere, Earth detector shielding. We present a careful calculation SIMP signal rate, focusing on super-heavy DM ($m_\chi \gtrsim 10^5 \,\,\mathrm{GeV}$) which standard nuclear-stopping formalism applicable, provide code...
The search for weakly-interacting massive particle (WIMP) dark matter is multi-pronged. Ultimately, the WIMP-dark-matter picture will only be confirmed if different classes of experiments see consistent signals and infer same WIMP properties. In this work, we review ideas, methods, status direct-detection searches. We focus in particular on extracting physics (WIMP interactions phase-space distribution) from data early discovery days when multiple order dozens to hundreds events. To...
Light dark matter (DM), defined here as having a mass between 1 MeV and about GeV, is an interesting possibility both theoretically phenomenologically, at one of the frontiers current progress in field DM searches. Its indirect detection via gamma rays challenged by scarcity experiments MeV--GeV region. We look therefore lower-energy x-ray data from INTEGRAL telescope, compare them with predicted flux. derive bounds which are competitive existing ones other techniques. Crucially, we include...
The QCD axion is expected to form dense structures known as miniclusters if the Peccei-Quinn symmetry broken after inflation. Miniclusters that have survived until today will interact with neutron stars (NSs) in Milky Way produce transient radio signals from axion-photon conversion NS magnetosphere. We quantify properties of these encounters and find they occur frequently [$\mathcal{O}(1--100){\mathrm{day}}^{\ensuremath{-}1}$], last between a day few months, are spatially clustered toward...
Axion miniclusters are dense bound structures of dark matter axions that predicted to form in the postinflationary Peccei-Quinn symmetry breaking scenario. Although dense, can easily be perturbed or even become unbound by interactions with baryonic objects such as stars. Here, we characterize spatial distribution and properties Milky Way (MW) today after undergoing these stellar throughout their lifetime. We do this performing a suite Monte Carlo simulations which track miniclusters'...
Abstract The science objectives of the LISA mission have been defined under implicit assumption a 4-years continuous data stream. Based on performance Pathfinder, it is now expected that will duty cycle $$\approx 0.75$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mn>0.75</mml:mn> </mml:mrow> </mml:math> , which would reduce effective span usable to 3 years. This paper reports results study by Science Group, was charged with assessing...
The search for particle-like dark matter with meV-to-GeV masses has developed rapidly in the past few years. We summarize science case these searches, recent progress, and exciting upcoming opportunities. Funding Research Development a portfolio of small projects will allow community to capitalize on substantial advances theory experiment probe vast regions unexplored dark-matter parameter space coming decade.
We model the strong lensing effect in galaxy cluster PSZ1 G311.65-18.48 (z=0.443) with an improved version of hybrid method WSLAP+. extend number constraints by including position critical points, which are combined classic positional lensed galaxies. pay special attention to a transient candidate source (Tr) previously discovered giant Sunburst arc (z=2.37). Our lens predicts Tr be within fraction arcsecond from curve, having larger magnification factor than found, but still not large...