A5090203263- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Astronomy and Astrophysical Research
- Noncommutative and Quantum Gravity Theories
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Machine Learning and Data Classification
- Anomaly Detection Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Relativity and Gravitational Theory
- Astronomical Observations and Instrumentation
- Physics of Superconductivity and Magnetism
- Medical Imaging Techniques and Applications
- Metabolomics and Mass Spectrometry Studies
University of California, Berkeley
2018-2025
Lawrence Berkeley National Laboratory
2018-2025
European Organization for Nuclear Research
2021-2024
University of California, Santa Cruz
2023
Massachusetts Institute of Technology
2015-2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2019
Université Paris-Saclay
2019
CEA Paris-Saclay
2019
Institut de Recherche sur les Lois Fondamentales de l'Univers
2019
Institute for Advanced Study
2019
The axion is a promising dark matter candidate, which was originally proposed to solve the strong-CP problem in particle physics. To date, available parameter space for and axionlike relatively unexplored, particularly at masses m_{a}≲1 μeV. ABRACADABRA new experimental program search over broad range of masses, 10^{-12}≲m_{a}≲10^{-6} eV. ABRACADABRA-10 cm small-scale prototype future detector that could be sensitive QCD axion. In this Letter, we present first results from 1 month axions...
Two of the most pressing questions in physics are microscopic nature dark matter that comprises 84% mass universe and absence a neutron electric dipole moment. These would be resolved by existence hypothetical particle known as quantum chromodynamics (QCD) axion. In this work, we probe hypothesis axions constitute matter, using ABRACADABRA-10cm experiment broadband configuration, with world-leading sensitivity. We find no significant evidence for axions, present 95% upper limits on...
Gravitational waves (GWs) generate oscillating electromagnetic effects in the vicinity of external electric and magnetic fields. We discuss this phenomenon with a particular focus on reinterpreting results axion haloscopes based lumped-element detectors, which probe GWs 100 kHz-100 MHz range. Measurements from ABRACADABRA SHAFT already place bounds GWs, although present strain sensitivity is weak. However, we demonstrate that scaling volume such instruments significant-faster than for...
We revisit a question asked by Dyson: “Is graviton detectable?” demonstrate that in both Dyson’s original sense and more modern measurement-theoretic sense, it is possible to construct detector sensitive single gravitons, fact variety of existing near-term gravitational wave detectors can achieve this. However, while such signal would be consistent with the quantization field, we draw on results from quantum optics show how same could just as well explained via classical waves. outline kind...
A bstract In the presence of electromagnetic fields, both axions and gravitational waves (GWs) induce oscillating magnetic fields: a potentially detectable fingerprint their presence. We demonstrate that response is largely dictated by symmetries instruments used to search for it. Focussing on low mass axion haloscopes, we derive selection rules determine parametric sensitivity different detector geometries GWs, which further reveal how optimise experimental geometry maximise signals. The...
Utilizing the Fermi measurement of $\ensuremath{\gamma}$-ray spectrum toward Inner Galaxy, we derive some strongest constraints to date on dark matter (DM) lifetime in mass range from hundreds MeV above an EeV. Our profile-likelihood-based analysis relies 413 weeks Pass 8 data 200 2 TeV, along with up-to-date models for diffuse emission within Milky Way. We model Galactic and extragalactic DM decay include contributions DM-induced flux resulting both primary inverse-Compton scattering...
The next generation of axion direct detection experiments may rule out or confirm axions as the dominant source dark matter. We develop a general likelihood-based framework for studying time-series data at such experiments, with focus on role dark-matter astrophysics, to search signatures QCD like particles. illustrate how in event likelihood be used extract measures local matter phase-space distribution, accounting effects annual modulation and gravitational focusing, which is perturbation...
A bstract We derive bounds on couplings in the standard model effective field theory (SMEFT) as a consequence of causality and analytic structure scattering amplitudes. In SMEFT, there are 64 independent operators at mass dimension eight that quartic bosons (either Higgs or gauge fields) contain four derivatives and/or strengths, including both CP-conserving CP-violating operators. Using dispersion relation arguments for two-to-two bosonic amplitudes, we 27 sign magnitude couplings. show...
A bstract We compute the decay spectrum for dark matter (DM) with masses above scale of electroweak symmetry breaking, all way to Planck scale. For an arbitrary hard process involving a unbroken standard model, we determine prompt distribution stable states including photons, neutrinos, positrons, and antiprotons. These spectra are crucial ingredient in search DM via indirect detection at highest energies as being probed current upcoming experiments IceCube, HAWC, CTA, LHAASO. Our approach...
Sterile neutrinos with masses in the keV range are well-motivated extensions to Standard Model that could explain observed neutrino while also making up dark matter (DM) of universe. If sterile DM then they may slowly decay into active and photons, giving rise possibility their detection through narrow spectral features astrophysical x-ray data sets. In this Letter, we perform most sensitive search date for other decaying scenarios across mass from 5 16 using archival XMM-Newton data. We...
Axions, hypothetical particles ubiquitous in theories of particle physics, can be produced great profusion the early Universe and remain relativistic to present day, forming a relic background - cosmic axion (CaB). In paper, Jeff A. Dror, Hitoshi Murayama, Nicolas L. Rodd explore different production mechanisms axions potential their discovery with extant future experiments. They show that experiments have sensitivities relevant CaB and, therefore, serve as probes history Universe.
TeV-scale particles that couple to the standard model through weak force represent a compelling class of dark matter candidates. The search for such Weakly Interacting Massive Particles (WIMPs) has already spanned multiple decades, and whilst it yet provide any definitive evidence their existence, viable parameter space remains. In this paper, we show upcoming Cherenkov Telescope Array (CTA) significant sensitivity uncharted at TeV mass scale. To do so, focus on two prototypical candidates,...
Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age Universe. A corollary statement is that abundance any particle can decay over cosmological timescales constrained much smaller cold dark-matter density. We show an irreducible freeze-in contribution relic density axions in violation a large portion parameter space. This allows us set stringent constraints on mass range 100 eV-100 MeV. At 10 keV our constraint photophilic...
While astrophysical and cosmological probes provide a remarkably precise consistent picture of the quantity general properties dark matter, its fundamental nature remains one most significant open questions in physics. Obtaining more comprehensive understanding matter within next decade will require overcoming number theoretical challenges: groundwork for these strides is being laid now, yet much to be done. Chief among upcoming challenges establishing foundation needed harness full...
We outline the unique opportunities and challenges in search for “ultraheavy” dark matter candidates with masses between roughly 10 TeV Planck scale m_{\rm pl} ≈ 10^{16} TeV. This mass range presents a wide relatively unexplored parameter space, rich space of possible models cosmic histories. emphasize that both current detectors new, targeted techniques, via direct indirect detection, are poised to contribute searches ultraheavy particle coming decade. highlight need new developments this...
We outline a fundamentally quantum description of bosonic dark matter (DM) from which the conventional classical-wave picture emerges in limit <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>m</a:mi><a:mo>≪</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>eV</a:mi></a:math>. As appropriate for system, we start density matrix, encodes full information regarding possible measurements could make DM and their fluctuations. Following fundamental...
If dark matter is embedded in a nontrivial sector, it may annihilate and decay to lighter dark-sector states which subsequently the standard model. Such scenarios---with annihilation followed by cascading decays---can explain apparent excess GeV gamma rays identified central Milky Way, while evading bounds from direct detection experiments. Each ``step'' cascade will modify observable signatures of decay, shifting resulting photons other final state particles lower energies broadening their...
If dark matter inhabits an expanded ``hidden sector'', annihilations may proceed through sequential decays or multi-body final states. We map out the potential signals and current constraints on such a framework in indirect searches, using model-independent setup based multi-step hierarchical cascade decays. While remaining agnostic to details of hidden sector model, our captures generic broadening spectrum secondary particles (photons, neutrinos, e+e− p) relative case direct annihilation...
The Fermi Large Area Telescope has observed an excess of ~GeV energy gamma rays from the center Milky Way, which may arise near-thermal dark matter annihilation. Firmly establishing origin for this is however complicated by challenges in modeling diffuse cosmic-ray foregrounds as well unresolved astrophysical sources, such millisecond pulsars. Non-Poissonian Template Fitting (NPTF) one statistical technique that previously been used to show at least some fraction GeV likely due a population...
Observations by the Fermi-LAT have uncovered a bright, spherically symmetric excess surrounding center of Milky Way galaxy. The spectrum gamma-ray peaks sharply at an energy ~2 GeV, exhibiting hard lower energies, and falls off quickly above ~5 GeV. ~10 GeV is potentially important discriminator between different physical models for its origin. We focus our study on observations energies exceeding 10 finding: (1) statistically significant remains in range 9.5-47.5 which not degenerate with...
We use 413 weeks of publicly available Fermi Pass 8 gamma-ray data combined with recently developed galaxy group catalogs to search for evidence dark matter annihilation in extragalactic halos. In our study, we luminosity-based mass estimates and mass-to-concentration relations infer the $J$ factors associated uncertainties hundreds groups within a redshift range $z\ensuremath{\lesssim}0.03$. employ conservative substructure boost factor model, which only enhances sensitivity by an...
We use unitarity and analyticity of scattering amplitudes to constrain fermionic operators in the standard model effective field theory. For four-fermion at mass dimension 8, we scatter flavor superpositions fixed representations find Wilson coefficients be constrained so that their contraction with any pair pure density matrices is positive. These constraints imply flavor-violating couplings are upper bounded by flavor-conserving cousins. instance, LEP data already appears preclude certain...
Neutrino masses and mixings can be generated in many different ways, with some of these scenarios featuring new physics at energy scales relevant for Large Hadron Collider searches. A systematic approach to constructing a large class models Majorana neutrinos may founded upon list gauge-invariant effective operators---formed from quarks, leptons the Higgs doublet---that violate lepton-number conservation by two units. By opening up operators all possible ways consistent minimality...
The Galactic Center Excess (GCE) of GeV gamma rays can be explained as a signal annihilating dark matter or emission from unresolved astrophysical sources, such millisecond pulsars. Evidence for the latter is provided by statistical procedure---referred to Non-Poissonian Template Fitting (NPTF)---that distinguishes smooth distribution photons expected annihilation "clumpy" photon point sources. In this paper, we perform an extensive study NPTF on simulated data, exploring its ability recover...