A5032805963- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Astronomy and Astrophysical Research
- Analytical Chemistry and Sensors
- Advanced Thermodynamics and Statistical Mechanics
- Advanced biosensing and bioanalysis techniques
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Age of Information Optimization
- Advanced MRI Techniques and Applications
- Molecular Sensors and Ion Detection
- Cellular Mechanics and Interactions
- Cell Adhesion Molecules Research
- Molecular Junctions and Nanostructures
- Pulsars and Gravitational Waves Research
- Quantum Mechanics and Applications
Johannes Gutenberg University Mainz
2017-2023
Helmholtz Institute Mainz
2017-2023
GSI Helmholtz Centre for Heavy Ion Research
2021-2023
Heinrich Heine University Düsseldorf
2022
Pontificia Universidad Católica de Chile
2017-2021
Numerous theories extending beyond the standard model of particle physics predict existence bosons that could constitute dark matter (DM) permeating universe. In halo (SHM) galactic velocity distribution bosonic DM field defines a characteristic coherence time $\tau_c$. Until recently, laboratory experiments searching for fields have been in regime where measurement $T$ significantly exceeds $\tau_c$, so null results interpreted as constraints on coupling to particles with amplitude $\Phi_0$...
We report the results of a search for axionlike dark matter using nuclear magnetic resonance (NMR) techniques. This is part multi-faceted Cosmic Axion Spin Precession Experiment (CASPEr) program. In order to distinguish from fields, we employ comagnetometry scheme measuring ultralow-field NMR signals involving two different nuclei ($^{13}$C and $^{1}$H) in liquid-state sample acetonitrile-2-$^{13}$C ($^{13}$CH$_{3}$CN). No signal was detected above background. result constrains parameter...
The nature of dark matter, the invisible substance making up over 80% matter in universe, is one most fundamental mysteries modern physics. Ultralight bosons such as axions, axion-like particles, or photons could make matter. Couplings between and nuclear spins may enable their direct detection via magnetic resonance (NMR) spectroscopy: As move through galactic dark-matter halo, they couple to behave if were an oscillating field, generating a dark-matter-driven NMR signal. part cosmic axion...
We report the results of an experimental search for ultralight axion-like dark matter in mass range 162 neV to 166 neV. The detection scheme our Cosmic Axion Spin Precession Experiment (CASPEr) is based on a precision measurement $^{207}$Pb solid-state nuclear magnetic resonance polarized ferroelectric crystal. Axion-like can exert oscillating torque spins via electric-dipole moment coupling $g_d$, or gradient $g_{\text{aNN}}$. calibrated detector and characterized excitation spectrum...
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
We report measurements of isotope shifts for the five spinless Yb isotopes on 6s^{2} ^{1}S_{0}→5d6s ^{1}D_{2} transition using Doppler-free two-photon spectroscopy. combine these data with existing two transitions in Yb^{+} [Counts et al. Phys. Rev. Lett. 125, 123002 (2020)PRLTAO0031-900710.1103/PhysRevLett.125.123002], where deviation from King-plot linearity showed hints a new bosonic force carrier at 3σ level. The combined strongly reduce significance new-physics signal. show that...
A possible implication of an ultralight dark matter field interacting with the standard model degrees freedom is oscillations fundamental constants. Here, we establish direct experimental bounds on coupling oscillating to up, down, and strange quarks gluons, for oscillation frequencies between 10 10^{8} Hz. We employ spectroscopic experiments that take advantage dependence molecular transition nuclear masses. Our results apply previously unexplored frequency bands improve existing at >5 MHz....
We present a search for fundamental constant oscillations in the range 20 kHz--100 MHz that may arise within models ultralight dark matter (UDM). Using two independent optical-spectroscopy apparatuses, we achieve up to $\ifmmode\times\else\texttimes\fi{}1000$ greater sensitivity relative previous work [D. Antypas et al., Phys. Rev. Lett. 123, 141102 (2019).]. report no observation of UDM and thus constrain respective couplings electrons photons investigated particle mass...
The cosmic axion spin precession experiment (CASPEr) is a nuclear magnetic resonance (NMR) seeking to detect and axion-like particles which could make up the dark matter present in Universe. We review predicted couplings of axions with baryonic that enable their detection via NMR. then describe two measurement schemes being implemented CASPEr. first method, presented original CASPEr proposal, consists resonant search continuous-wave NMR spectroscopy. This method offers highest sensitivity...
Ensembles of nitrogen-vacancy (N-$V$) centers in diamond show promise as versatile electric field sensors, but are limited by noise from an inhomogeneous internal charge environment. Here researchers develop a scheme for optically enhanced electrometry that improves N-$V$ sensitivity to external fields, especially at low temperatures. They also implement complementary method experimentally extracting the color center's excited-state susceptibilities, and they provide simple scaling theory...
We derive spectral line shapes of the expected signal for a haloscope experiment searching axionlike dark matter. The knowledge these is needed to optimize an experimental design and data analysis procedure. extend previously known results axion-photon axion-gluon couplings case gradient (axion-fermion) coupling. A unique feature interaction its dependence not only on magnitudes but also directions velocities galactic halo particles, which leads directional sensitivity corresponding...
Ultralight bosonic dark matter (UBDM) can be described by a classical wave-like field oscillating near the Compton frequency of bosons. If measurement scheme for direct detection UBDM interactions is sensitive to signature quadratic in field, then there near-zero-frequency (dc) component signal. Thus, detector with given finite bandwidth used search bosons frequencies many orders magnitude larger than its bandwidth. This opens possibility analogous Hanbury Brown and Twiss intensity...
An overview of our experimental program to search for axion and axion-like-particle (ALP) dark matter using nuclear magnetic resonance (NMR) techniques is presented. oscillating field can exert a time-varying torque on spins either directly or via generation an electric dipole moment (EDM). Magnetic be used detect such effect. The first-stage experiments explore many decades ALP parameter space beyond the current astrophysical laboratory bounds. It anticipated that future versions will...
Thy-1 and αvβ3 integrin mediate bidirectional cell-to-cell communication between neurons astrocytes. Thy-1/αvβ3 interactions stimulate astrocyte migration the retraction of neuronal prolongations, both processes in which internal forces are generated affecting bimolecular that maintain cell-cell adhesion. Nonetheless, how respond to mechanical cues is an unresolved issue. In this study, optical tweezers were used as a single-molecule force transducer, Dudko-Hummer-Szabo model was applied...
Nuclear magnetic resonance is a promising experimental approach to search for ultra-light axion-like dark matter. Searches such as the cosmic axion spin-precession experiments (CASPEr) are ultimately limited by quantum-mechanical noise sources, in particular, spin-projection noise. We discuss how fundamental limits can potentially be reached. consider circuit model of experiment and quantify three sources: noise, thermal amplifier Calculation total spectrum takes into account modification...
Dark matter is one of the biggest open questions in physics today. It known that it interacts gravitationally with luminous matter, so accelerometer-based searches are inherently interesting. In this article we present recent (and future) for dark candidates such as feebly interacting trapped inside Earth, scalar-matter domain walls and axion quark nuggets, accelerometer networks give an outlook how new atomic-interferometry-based could support searches.
Abstract Numerous observations suggest that there exist undiscovered beyond‐the‐standard‐model particles and fields. Because of their unknown nature, these exotic fields could interact with standard model in many different ways assume a variety possible configurations. Here, an overview the global network optical magnetometers for physics searches (GNOME), ongoing experimental program designed to test wide range scenarios, is presented. The GNOME experiment utilizes worldwide shielded atomic...
Numerous observations suggest that there exist undiscovered beyond-the-Standard-Model particles and fields. Because of their unknown nature, these exotic fields could interact with Standard Model in many different ways assume a variety possible configurations. Here we present an overview the Global Network Optical Magnetometers for Exotic physics searches (GNOME), our ongoing experimental program designed to test wide range scenarios. The GNOME experiment utilizes worldwide network shielded...
Hidden matter that interacts only gravitationally would oscillate at characteristic frequencies when trapped inside of Earth. For small oscillations near the center Earth, these are around 300 $\mu$Hz. Additionally, signatures higher harmonics appear because non-uniformity Earth's density. In this work, we use data from a global network gravimeters International Geodynamics and Earth Tide Service (IGETS) to look for hypothetical objects. We find no evidence such objects with masses on order...
Abstract Results are reported from the first full-scale search for transient signals exotic fields of astrophysical origin using data a newly constructed Earth-scale detector: Global Network Optical Magnetometers Exotic physics searches (GNOME). Data collected by GNOME consist correlated measurements optical atomic magnetometers located in laboratories all over world. searched patterns propagating through network consistent with composed ultralight bosons such as axion-like particles (ALPs)....
Optical tweezers have enabled the exploration of picoNewton forces and dynamics in single-molecule systems such as DNA molecular motors. In this work, we used optical to study folding/unfolding APTSTX1-aptamer, a single-stranded molecule with high affinity for saxitoxin (STX), lethal neurotoxin. By measuring transition force during (un)folding processes, were able characterize distinguish conformational changes aptamer presence magnesium ions toxin. This work was supported by (MD)...