Marios Maroudas
A5077651786- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Space Science and Extraterrestrial Life
- Particle Detector Development and Performance
- Stellar, planetary, and galactic studies
- Computational Physics and Python Applications
- Radioactive Decay and Measurement Techniques
- Random lasers and scattering media
- Atmospheric Ozone and Climate
- Strong Light-Matter Interactions
- CCD and CMOS Imaging Sensors
- Circadian rhythm and melatonin
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Quantum Information and Cryptography
- Complex Systems and Time Series Analysis
- Quantum optics and atomic interactions
- Age of Information Optimization
- Paranormal Experiences and Beliefs
- Seismic Waves and Analysis
- Health, Environment, Cognitive Aging
Universität Hamburg
2023-2025
University of Patras
2016-2024
Universidad de Zaragoza
2023
European Organization for Nuclear Research
2020
Institute for Nuclear Research
2019
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
It has been recently argued that numerous enigmatic observations remain challenging to explain within the framework of conventional physics. These anomalies include unexpected correlations between temperature variations in stratosphere, total electron content Earth’s atmosphere, and earthquake activity on one hand positions planets other. Decades collected data provide statistically significant evidence for these observed correlations. works suggest arise from strongly interacting “streaming...
A bstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part CERN Solar Telescope (CAST), searching for axion dark matter in 34.67 μ eV mass range. radio frequency cavity consisting 5 sub-cavities coupled by inductive irises took physics data inside CAST dipole magnet first time using this filter-like haloscope geometry. An exclusion limit with 95% credibility level on axion-photon coupling constant g aγ ≳ 4 × 10 − 13 GeV 1 over range 34 ....
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
Gravitational lensing of invisible streaming matter towards the Sun with speeds around 10−4 to 10−3c could be explanation puzzling solar flares and unexplained emission in EUV. Assuming that this massive has some form interaction normal preferred directions exist its flow, then one would expect a more pronounced activity at certain planetary heliocentric longitudes. This is best demonstrated case Earth two inner planets, considering their relatively short revolution time (365, 225 88 days)...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
Celestial observations often exhibit inexplicable planetary dependencies when the timing of an observable is projected onto heliocentric positions. This possible only for incident, non-relativistic streams. Notably, celebrated dark matter (DM) in Universe can form streams our vicinity with speeds about 240 km/s. Since gravitational impact scales $1/(\text{velocity})^2$, all solar system objects, including Sun and Moon, act as strong lenses, their focal planes located within system. Even Moon...
We discuss the physics case for and concept of a medium-scale axion helioscope with sensitivities in axion-photon coupling few times better than CERN Axion Solar Telescope (CAST). Search an axion-like particle these couplings is motivated by several persistent astrophysical anomalies. present early conceptual design, existing infrastructure, projected sensitivity timeline such (Troitsk Experiment, TASTE) to be constructed Institute Nuclear Research, Troitsk, Russia. The proposed instrument...
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching via their back conversion to x-ray photons in 9-T 10-m long magnet directed toward Sun. We report on an extended run with International Observatory pathfinder detector, doubling previous exposure time. detector was operated xenon-based gas mixture part of new run, providing technical insights future configurations. No counts...
Cosmological simulations for cold dark matter (DM) indicate that a large number of streams might exist in our Galaxy. The present work incorporates gravitational focusing (GF) effects on streaming DM constituents by the Sun and Earth preceding their encounter with bound detectors. For DM, GF gives rise to spatiotemporal flux enhancements orders magnitude above nominal density. Remarkably, due Earth's rotation derived appear as transient signals lasting about 10 seconds repeating daily days...
A novel table-top experiment is introduced to detect photon-axion conversion: WISP searches on a fiber interferometer (WISPFI). The setup consists of Mach-Zehnder-type with placed inside an external magnetic field, where mixing occurs which detected by measuring changes in amplitude. Hollow-core photonic crystal fibers (HC-PCF) will be used achieve resonant that tuneable regulating the gas pressure fiber. An unexplored axion mass-range (28 meV–100 meV) can probed reaching two-photon coupling...
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...
We investigate the prospects for direct detection of dark matter (DM) particles, incident on upper atmosphere. A recent work relating burst-like temperature excursions in stratosphere at heights ≈38–47 km with low speed invisible streaming is motivation behind this proposal. As an example, photons could match reasoning presented that provided they constitute part local DM density. Dark emerge as a U(1) symmetry within extensions standard model. mix real same total energy without need...
Based on helioseismological measurements (1996–2017), the entire Sun shrinks during solar maximum and regrows next minimum by about a few km (~10−5 effect). Here, we observe, for first time, that radius variation resembles 225-day relationship coincides with Venus’ orbital period. We show remote link between planet Venus Sun’s size must be at work. However, within known realms of physics, this is unexpected. Therefore, can only speculate its cause. Notably, driving idea behind investigation...
We describe a proposal to search for an intrinsic electric dipole moment (EDM) of the proton with sensitivity \targetsens, based on vertical rotation polarization stored beam. The New Physics reach is order $10^~3$TeV mass scale. Observation EDM provides best probe CP-violation in Higgs sector, at level that may be inaccessible electron-EDM experiments. improvement $\theta_{QCD}$, parameter crucial axion and dark matter physics, about three orders magnitude.
We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to soft X-ray photons in energy range from 200 eV 10 keV converted chameleons. No signiffcant excess over expected background has been observed data taken 2014 and 2015. set an improved limit chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ $1<\beta_\mathrm{m}<10^6$ at 95% C.L. improving our previous results by factor two first time reaching sensitivity below...
A new search strategy for the detection of elusive dark matter (DM) axion is proposed. The idea based on streaming DM axions, whose flux might get temporally enormously enhanced due to gravitational lensing. This can happen if Sun or some planet (including Moon) found along direction a stream propagating towards Earth location. experimental requirements haloscope are wide-band performance combined with fast rest mass scanning mode, which feasible. Once both conditions have been implemented...
The main alternatives of the recent XENON1T observation are solar axions, neutrino magnetic moment and tritium. In this short note we suggest to crosscheck whether is related or not dark matter (DM) streams, by searching for planetary dependence observed excess. If such a correlation derived, hint (<3.5sigma) can become overlooked direct DM discovery. To do it necessary analyze time distribution all data, in particular electronic events with their stamp energy. Notably, velocities sector...
In arXiv:1812.02482 Socas-Navarro (SN) provided multiple confirmation of the claimed 88 days melanoma periodicity. This greatly strengthens observation by Zioutas and Valachovic (ZV). Here we comment on work SN, because it objects interpretation ZV. Notice that SN objection is based serious assumptions, which were explicitly excluded Further, conclusion made with a sub-set data (4 percent) statistically not significant to dispute On contrary, since same periodicity appears also in other 8...
Streams from the dark universe may affect biologic processes on Earth including occurrence of cancer. Here, we have recovered complete daily melanoma incidence rates 1982–2014 in Australia. If there is no other external cause for melanoma, its seasonal rate should be steady with a broad maximum during local summertime due to increased solar UV exposure. The reported cases show instead: (A) modulation repeating every [Formula: see text] weeks; (B) time-dependence which relates also Moon’s...
This report addresses the time dependence of normal biomedical processes. The conception rate in humans shows relationships that strikingly coincide with planetary periodicities like orbital period Jupiter, 11 years solar cycle and 237 days Jupiter–Venus synod, combined on Jupiter Mars’ position. birth rates are used as surrogates based a data set available from Minnesota Department Health. statistical significance each independent analysis (far) exceeds 5[Formula: see text]. result cannot...
We investigate the prospects for direct detection of Dark Matter (DM) particles, such as dark photons, incident on upper atmosphere. A recent work relates burst-like temperature excursions in stratosphere at heights ~38-47 km with invisible streaming matter. Surprisingly, photons match reasoning presented that provided they constitute part local DM density. mix real same total energy without need an external field would be required instance axions. Furthermore, ionospheric plasma column...
Gravitational lensing of invisible streaming matter towards the Sun could be explanation puzzling solar flares and unexplained emission in EUV. Assuming that this has some form interaction with normal there exist preferred directions its flow, then one would expect a more pronounced activity at certain planetary heliocentric longitudes. This is best demonstrated case Earth two inner planets. We have analyzed as well EUV emission. observe statistically significant signals when or planets...