A5042563144- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Black Holes and Theoretical Physics
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Robotics and Sensor-Based Localization
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- International Science and Diplomacy
- High-Energy Particle Collisions Research
- Intensive Care Unit Cognitive Disorders
- Advanced Frequency and Time Standards
- Cardiac Imaging and Diagnostics
- Social and Demographic Issues in Germany
- Environmental Science and Technology
- Cold Atom Physics and Bose-Einstein Condensates
- Radio Astronomy Observations and Technology
University of Stuttgart
2023-2024
Stanford University
2020-2024
University of Manitoba
2024
Kavli Institute for Particle Astrophysics and Cosmology
2023-2024
RWTH Aachen University
2023-2024
European University of Applied Sciences
2023
AlbaNova
2017-2020
Stockholm University
2017-2020
KTH Royal Institute of Technology
2017-2020
Uppsala University
2014-2015
Axion stars are hypothetical objects formed of axions, obtained as localized and coherently oscillating solutions to their classical equation motion. Depending on the value field amplitude at core |θ0|≡|θ(r=0)|, equilibrium system arises from balance kinetic pressure either self-gravity or axion self-interactions. Starting a general relativistic framework, we obtain set equations describing configuration star, which solve function |θ0|. For small |θ0|≲1, reproduce results previously in...
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in 2030s. ILC addresses key questions for our current understanding of particle physics. It based proven technology. Its experiments will challenge Standard Model physics and provide window to look beyond it. This document brings story up date, emphasizing its strong motivation, readiness construction, opportunity it presents US community.
A new measurement of the muon anomalous magnetic moment has been reported by Fermilab Muon g-2 collaboration and shows a $4.2\sigma$ departure from most precise reliable calculation this quantity in Standard Model. Assuming that discrepancy is due to physics, we concentrate on simple supersymmetric model also provides dark matter explanation previously unexplored region parameter space. Such interesting can realize Bino-like candidate compatible with all current direct detection constraints...
Gravitationally bound clumps of dark matter axions in the form ``miniclusters'' or even denser ``axion stars'' can generate strong radio signals through axion-photon conversion when encountering highly magnetized neutron star magnetospheres. We systematically study encounters axion with stars and characterize infall, subsequent propagation photons. show that high density low escape velocity lead to strong, narrow, temporally characteristic transient lines an expected duration varying from...
Recently, the DAMA/LIBRA collaboration released updated results from their search for annual modulation signal Dark Matter (DM) scattering in detector. Besides approximately doubling exposure of data set, photomultiplier tubes experiment allow a lower recoil energy threshold 1\,keV electron equivalent compared to previous 2 keV equivalent. We study compatibility observed with DM scattering. Due conspiracy multiple effects, new at low energies is very powerful testing hypothesis. find that...
The long-standing question concerning jetted subgalactic-size (JSS) radio sources is whether they will evolve into large galaxies, die before escaping the host galaxy, or remain indefinitely confined to their compact size. Our main goal propose a scenario that explains relative number of JSS and general properties. We studied parsec-scale morphology complete sample 21 objects using Very Long Baseline Array (VLBA) observations at various frequencies analyzed morphological characteristics...
A bstract Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of Universe via a strong first order electroweak phase transition. We compare transition patterns suggested by vacuum structure at critical temperatures , which local minima are degenerate, with those obtained from computing probability for nucleation tunneling through barrier separating minima. Heuristically, becomes difficult if between too high, or distance (in field space) large. As example...
A bstract We analyze a low energy effective model of Dark Matter in which the thermal relic density is provided by singlet Majorana fermion interacts with Higgs fields via higher dimensional operators. Direct detection signatures may be reduced if blind spot solutions exist, naturally appear models extended sectors. Explicit mass terms for can forbidden Z 3 symmetry, addition leads to reduction number Moreover, weak scale obtained from vacuum expectation value scalar field. The proper s...
A large experimental program is underway to extend the sensitivity of direct detection experiments, searching for interaction Dark Matter with nuclei, down neutrino floor. However, such experiments are becoming increasingly difficult and costly due target masses exquisite background rejection needed necessary improvements in sensitivity. We investigate an alternative approach Matter-nucleon interactions: Searching persistent traces left by scattering ancient minerals obtained from much...
We study the collider phenomenology of extended Higgs sector next-to-minimal supersymmetric Standard Model (NMSSM). The region NMSSM parameter space favored by a 125 GeV SM-like and naturalness generically features light neutralino spectrum as well large $\mathcal{O}(1)$ coupling between doublets singlet fields. In such regimes, heavier bosons can decay dominantly into lighter neutralinos. prospects observing decays at 13 TeV LHC, focusing on mono-Higgs signatures probes regions space....
We explore paleo-detectors as an approach to the direct detection of weakly interacting massive particle (WIMP) dark matter radically different from conventional detectors. Instead instrumenting a (large) target mass in laboratory order observe WIMP-induced nuclear recoils real time, is examine ancient minerals for traces WIMP-nucleus interactions recorded over timescales large 1 Gyr. Here, we discuss paleo-detector proposal detail, including background sources and possible materials. In...
A bstract The Next-to-Minimal Supersymmetric Standard Model (NMSSM), the singlet extension of MSSM which fixes many MSSM’s shortcomings, is shown to be within reach upcoming runs Large Hadron Collider (LHC). systematic treatment various Higgs decay channels and their interplay has been lacking due seemingly large number free parameters in NMSSM’s sector. We demonstrate that SM-like nature observed boson, neutralino sectors have highly correlated masses couplings can effectively described by...
Dark compact objects (``clumps'') transiting the Solar System exert accelerations on test masses (TM) in a gravitational-wave (GW) detector. We reexamine detectability of these clump transits variety current and future GW detectors, operating over broad range frequencies. TM induced by through inner have frequency content around $f\ensuremath{\sim}\ensuremath{\mu}\mathrm{Hz}$. Some us [Fedderke et al., Phys. Rev. D 105, 103018 (2022)] recently proposed detection concept with...
Weakly interacting massive particles (WIMPs), which are among the best motivated dark matter (DM) candidates, could make up all or only a fraction of total DM budget. We consider scenario in WIMPs subdominant component; such would affect both current direct and indirect bounds on WIMP-nucleon scattering cross section. In this paper we focus searches for neutrino flux produced by annihilation captured Sun Earth via either spin-dependent spin-independent scattering. derive rate expected at...
A bstract We show that simultaneously explaining dark matter and the observed value of muon’s magnetic dipole moment may lead to yet unexplored photon signals at LHC. consider Minimal Supersymmetric Standard Model with electroweakino masses in few-to-several hundred GeV range, opposite sign Bino mass parameter respect both Higgsino Wino parameters. In such region space, spin-independent elastic scattering cross section a Bino-like candidate direct detection experiment is suppressed by...
Paleo-detectors are a recently proposed method for the direct detection of dark matter (DM). In such detectors, one would search persistent damage features left by DM--nucleus interactions in ancient minerals. Initial sensitivity projections have shown that paleo-detectors could probe much remaining weakly interacting massive particle (WIMP) parameter space. this paper, we improve upon cut-and-count approach previously used to estimate performing full spectral analysis background- and...
Abstract Gravitational Waves (GWs) have been detected in the ∼ 100 Hz and nHz bands, but most of gravitational spectrum remains unobserved. A variety detector concepts proposed to expand range observable frequencies. In this work, we study capability GW detectors “mid-band”, 30 mHz– 10 between LISA LIGO, measure signals from constrain properties 1 – M ⊙ compact binaries. We focus on atom-interferometer-based detectors. describe a Fisher matrix code, AIMforGW , which created evaluate their...
We develop a method to forecast the outcome of LHC Run 3 based on hypothetical detection $\mathcal{O}(100)$ signal events at XENONnT. Our relies systematic classification renormalizable single-mediator models for dark matter--quark interactions and is valid matter candidates spin less than or equal one. Applying our simulated data, we find that end only two mutually exclusive scenarios would be compatible with In first scenario, energy distribution featureless, as canonical spin-independent...
Light scalar fields can drive the accelerated expansion of universe. Hence, they are obvious dark energy candidates. To make such models compatible with tests General Relativity in solar system and "fifth force" searches on Earth, one needs to screen them. One possibility is so-called "chameleon" mechanism, which renders an effective mass depending local matter density. If chameleon particles exist, be produced sun detected Earth exploiting equivalent a radiation pressure. Since their scales...
We report on a first measurement with sensitive opto-mechanical force sensor designed for the direct detection of coupling real chameleons to matter. These dark energy candidates could be produced in Sun and stream unimpeded Earth. The KWISP detector installed CAST axion search experiment at CERN looks tiny displacements thin membrane caused by mechanical effect solar chameleons. are detected Michelson interferometer homodyne readout scheme. benefits from focusing action ABRIXAS X-ray...
Dark matter annihilation might power the first luminous stars in Universe. These types of stars, known as dark could form $({10}^{6}--1{0}^{8})\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ protohalos at redshifts $z\ensuremath{\sim}20$, and they be much more larger size than ordinary powered by nuclear fusion. We investigate formation self-interacting (SIDM) scenario. present a concrete particle physics model SIDM that can simultaneously give rise to observed density, satisfy constraints from...
A bstract We present a systematic study of an extension the Standard Model (SM) with two Higgs doublets and one complex singlet (2HDM+S). In order to gain analytical understanding parameter space, we re-parameterize 27 parameters in Lagrangian by quantities more closely related physical observables: masses, mixing angles, trilinear quadratic couplings, vacuum expectation values. Embedding 125 GeV SM-like boson observed at LHC places stringent constraints on space. particular, interaction...
Paleodetectors are a proposed experimental technique in which one would search for traces of recoiling nuclei ancient minerals. Natural minerals on Earth as old $\mathcal{O}(1)\text{ }\text{ }\mathrm{Gyr}$ and, many minerals, the damage tracks left by also preserved timescales long compared to 1 Gyr once created. Thus, even reading out relatively small target samples order 100 g, paleodetectors allow very rare events thanks large exposure, $ϵ\ensuremath{\sim}100\text{ }\mathrm{g}\text{...
New physics close to the electroweak scale is well motivated by a number of theoretical arguments. However, colliders, most notably Large Hadron Collider (LHC), have failed deliver evidence for beyond Standard Model. One possibility how new electroweak-scale particles could evaded detection so far if they carry only charge, i.e. are color neutral. Future $e^+e^-$ colliders prime tools study such physics. Here, we investigate sensitivity scalar partners charged leptons, known as sleptons in...