A5061126453- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Advanced X-ray Imaging Techniques
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Relativity and Gravitational Theory
- Galaxies: Formation, Evolution, Phenomena
- Noncommutative and Quantum Gravity Theories
- Advanced Thermodynamics and Statistical Mechanics
- Laser-Plasma Interactions and Diagnostics
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Geophysics and Sensor Technology
Weizmann Institute of Science
2011-2025
Deutsches Elektronen-Synchrotron DESY
2024
Universidad Veracruzana
2024
Helmholtz Institute Mainz
2019-2022
Johannes Gutenberg University Mainz
2019-2022
Heinrich Heine University Düsseldorf
2022
GSI Helmholtz Centre for Heavy Ion Research
2022
University of Florida
2018
European Organization for Nuclear Research
2016
Stony Brook University
2007-2009
Abstract The cosmological relaxion can address the hierarchy problem, while its coherent oscillations constitute dark matter in present universe. We consider possibility that forms gravitationally bound objects we denote as stars. density of these stars would be higher than local density, resulting enhanced signals table-top detectors, among others. Furthermore, raise may trapped by an external gravitational potential, such Earth or Sun. This leads to formation halos even greater density....
Abstract This Conceptual Design Report describes LUXE (Laser Und XFEL Experiment), an experimental campaign that aims to combine the high-quality and high-energy electron beam of European with a powerful laser explore uncharted terrain quantum electrodynamics characterised by both high energy intensity. We will reach this hitherto inaccessible regime physics analysing electron-photon photon-photon interactions in extreme environment provided intense focus. The background its relevance are...
A model independent study of the minimal flavor violation (MFV) framework is presented, where only sources breaking at low energy are up and down Yukawa matrices. Two limits identified for coupling expansion: linear MFV, it truncated leading terms, nonlinear such a truncation not possible due to large third generation couplings. These then resummed all orders using $\ensuremath{\sigma}$-model techniques familiar from models collective breaking. Generically, flavor-diagonal $CP$ violating...
We explore a method to probe new long- and intermediate-range interactions using precision atomic isotope shift spectroscopy. develop formalism interpret linear King plots as bounds on physics with minimal theory inputs. focus only bounding the contributions that can be calculated independently of standard model nuclear effects. apply our existing Ca^{+} data project its sensitivity conjectured bosons spin-independent couplings electron neutron narrow transitions in other atoms ions,...
We propose a novel approach to probe new fundamental interactions using isotope shift spectroscopy in atomic clock transitions. As concrete toy example we focus on the Higgs boson couplings building blocks of matter: electron and up down quarks. show that attractive force between nuclei their bound electrons, which is poorly constrained, might induce effects are larger than current experimental sensitivities. More generically, discuss how neutrons, mediated via light degrees freedom, may...
Abstract As-yet undiscovered light bosons may constitute all or part of the dark matter (DM) our Universe, and are expected to have (weak) self-interactions. We show that quartic self-interactions generically induce capture from surrounding halo by external gravitational potentials such as those stars, including Sun. This leads subsequent formation bound states supported potentials, resembling atoms (e.g. a solar around own Sun). Their growth is governed ratio ξ foc ≡ λ dB / R ⋆ between de...
The axion-gluon coupling is the defining feature of QCD axion. This induces additional and qualitatively different interactions axion with standard model particles—quadratic couplings. Previously, hadronic quadratic couplings have been studied experimental implications explored especially in context atomic spectroscopy interferometry. We investigate to electromagnetic field electron mass. These are generated at loop level from threshold corrections expected be present absence fine-tuning....
We show that, in the Nelson-Barr solution to strong <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math>-problem, a naturally light scalar can arise. It gives rise completely new phenomenology beyond that of celebrated QCD axion, if this field constitutes dark matter, as elements Cabibbo–Kobayashi–Maskawa matrix vary periodically time. also discuss how model be tested using quantum sensors, particular nuclear clocks, which leads an...
We compute the expected value of cosmological constant in our universe from causal entropic principle. Since observers must obey laws thermodynamics and causality, principle asserts that physical parameters are most likely to be found range values for which total entropy production within a causally connected region is maximized. Despite absence more explicit anthropic criteria, resulting probability distribution turns out excellent agreement with observation. In particular, we find dust...
Isotope shifts of transition frequencies in atoms constrain generic long- and intermediate-range interactions. We focus on new physics scenarios that can be most strongly constrained by King linearity violation such as models with $B\ensuremath{-}L$ vector bosons, the Higgs portal, chameleon models. With anticipated precision, has potential to set strongest laboratory bounds these some regions parameter space. Furthermore, we show this method probe couplings relevant for protophobic...
We show that the relaxion, which addresses hierarchy problem, can account for observed dark matter (DM) relic density. The setup is similar to case of axion DM models topped with a dynamical misalignment mechanism. After reheating, when temperature well above electroweak scale, backreaction potential disappears, and relaxion displaced from its vacuum. When ``wiggles'' reappear, coherently oscillates around minimum as in vanilla models. identify parameter space such retrapped, leading...
A bstract Cosmological relaxation of the electroweak scale is an attractive scenario addressing gauge hierarchy problem. Its main actor, relaxion, a light spin-zero field which dynamically relaxes Higgs mass with respect to its natural large value. We show that relaxion generically stabilized at special position in space, leads suppression and potentially unnatural values for model’s effective low-energy couplings. In particular, we find mixing can be several orders magnitude above naive...
A bstract The two kaon factories, KOTO and NA62, are at the cutting edge of intensity frontier, with an unprecedented numbers long lived charged Kaons, ∼ 10 13 , being measured analyzed. These experiments have currently a unique opportunity to search for dark sectors. In this paper, we demonstrate that searches done NA62 complementary, both probing uncharted territories. We consider qualitatively different physics cases. first, analyze models axion-like-particles (ALP) which couple gluons or...
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...
A bstract We discuss models of ultralight scalar Dark Matter (DM) with linear and quadratic couplings to the Standard Model (SM). In addition studying phenomenology interactions separately, we examine their interplay. review different experiments that can probe such present current expected future bounds on parameter space. particular, field solution presented in [A. Hees, O. Minazzoli, E. Savalle, Y. V. Stadnik P. Wolf, Phys.Rev.D 98 (2018) 6, 064051], extend it theories capture both...
Axion-gluon interaction induces quadratic couplings between the axion and matter fields. We find that, if is an ultralight dark field, it small oscillations of mass hadrons as well other nuclear quantities. As a result, atomic energy levels oscillate. use currently available spectroscopy data to constrain such axion-gluon coupling. also project sensitivities future experiments, ones using molecular clock transitions. show that current near-future experiments finely tuned parameter space...
Among the prominent candidates for dark matter are bosonic fields with small scalar couplings to standard-model particles. Several techniques employed search such couplings, and current best constraints derived from tests of gravity or atomic probes. In experiments employing atoms, observables would arise expected dark-matter-induced oscillations in fundamental constants nature. These studies primarily sensitive underlying particle masses below ${10}^{\ensuremath{-}14}\text{ }\text{...
This Letter of Intent describes LUXE (Laser Und XFEL Experiment), an experiment that aims to use the high-quality and high-energy electron beam European a powerful laser. The scientific objective is study quantum electrodynamics processes in regime strong fields. High-energy electrons, accelerated by linear accelerator, photons, produced via Bremsstrahlung those colliding with laser shall experience electric field up three times larger than Schwinger critical (the at which vacuum itself...
A bstract We discuss the sensitivity of present and near-future axion dark matter experiments to a halo axions or axion-like particles gravitationally bound Earth Sun. Such halos, assuming they are formed, can be searched for in wide variety even when couplings small, while satisfying all experimental bounds on local properties matter. The structure coherence these halos also imply novel signals, which depend latitude orientation detector. demonstrate this by analyzing several distinct types...
We propose and experimentally demonstrate a method for detection of light scalar dark matter (DM) field through probing temporal oscillations fundamental constants in an atomic optical transition. Utilizing the quantum information notion dynamic decoupling (DD) tabletop setting, we are able to obtain model-independent bounds on variations $\ensuremath{\alpha}$ ${m}_{e}$ at frequencies up MHz scale. interpret our results constrain parameter space DM models. consider generic case, where...
A bstract If ultra-light dark matter (ULDM) exists and couples to neutrinos, it can be discovered via time-periodic variations in the neutrino mass mixing parameters. We analyze current bounds on such a scenario establish sensitivity expected for both time-averaged time-resolved modulations future oscillation experiments. place special emphasis our analysis time of CP violating phase. illustrate with toy model case where leading modulation effect while conserving parameters is suppressed....
The effects of scalar and pseudoscalar ultralight bosonic dark matter (UBDM) were searched for by comparing the frequency a quartz oscillator to that hyperfine-structure transition in ^{87}Rb, an electronic ^{164}Dy. We constrain linear interactions between UBDM field standard-model (SM) fields underlying particle mass range 1×10^{-17}-8.3×10^{-13} eV quadratic SM 5×10^{-18}-4.1×10^{-13} eV. Within regions respective ranges, our constraints on significantly improve results from previous,...
We highlight general issues associated with quality and naturalness problems in theories of light QCD-axions, axion-like particles, relaxions. show the presence Planck-suppressed operators generically lead to scalar coupling axions Standard model. present a new class $\mathbb Z_{N}$ QCD relaxion models that can address both CP problem as well its problem. This also leads interesting experimental signatures, which be searched for at precision frontier.
A bstract If Ultra-light dark matter (ULDM) exists and couples to neutrinos, the neutrino oscillation probability might be significantly altered by a parametric resonance. This resonance can occur if typical frequency of flavor-oscillations ∆ m 2 / (2 E ), where is mass-squared difference neutrinos energy, matches ULDM field, determined its mass, ϕ . The could lead observable effects even coupling very small, period, given τ = π/m , much shorter than experimental temporal resolution....