A5061209912- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Information and Cryptography
- Computational Physics and Python Applications
- Random lasers and scattering media
- Quantum Electrodynamics and Casimir Effect
- Noncommutative and Quantum Gravity Theories
- Neutrino Physics Research
- Quantum Mechanics and Applications
- Solar and Space Plasma Dynamics
- Experimental and Theoretical Physics Studies
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Quantum optics and atomic interactions
Heidelberg University
2016-2025
Heidelberg Institute for Theoretical Studies
2004-2024
Université Grenoble Alpes
2021
Centre National de la Recherche Scientifique
2021
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2021
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2021
Barry University
2021
Heidelberg University
2020
Karlsruhe Institute of Technology
2020
Institut de Physique
2019
Most embeddings of the Standard Model into a more unified theory, in particular ones based on supergravity or superstrings, predict existence hidden sector particles which have only very weak interactions with visible particles. Some these exotic particle candidates (such as e.g. "axions", "axion-like particles" and "hidden U(1) gauge bosons") may be light, masses sub-eV range, photons. Correspondingly, weakly interacting (WISPs) lead to observable effects experiments (as well astrophysical...
Very weakly interacting slim particles (WISPs), such as axion-like (ALPs) or hidden photons (HPs), may be non-thermally produced via the misalignment mechanism in early universe and survive a cold dark matter population until today. We find that, both for ALPs HPs whose dominant interactions with standard model arise from couplings to photons, huge region parameter spaces spanned by photon coupling ALP HP mass can give rise observed matter. Remarkably, large of this space coincides that...
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
We explore constraints on gauge bosons of a weakly coupled $U(1)_{B-L}$, $U(1)_{L_\mu-L_e}$, $U(1)_{L_e-L_\tau}$ and $U(1)_{L_\mu-L_\tau}$. To do so we apply the full constraining power experimental bounds derived for hidden photon secluded $U(1)_{X}$ translate them to considered groups. In contrast that acquires universal couplings charged Standard Model particles through kinetic mixing with photon, these groups different can vary widely. take finite, computable loop-induced effects into...
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO look for axions or axion-like particles (ALPs) originating in the Sun via Primakoff conversion of solar plasma photons. In terms signal-to-noise ratio, about 4–5 orders magnitude more sensitive than CAST, currently most powerful helioscope, reaching sensitivity to axion-photon couplings down few × 10−12 GeV−1 and thus probing large fraction unexplored ALP parameter space....
Axion-like particles (ALPs), relatively light (pseudo-)scalars coupled to two gauge bosons, are a common feature of many extensions the Standard Model. Up now there has been gap in sensitivity such MeV 10 GeV range. In this note we show that LEP data on $Z\to\gamma\gamma$ decays provides significant constraints range (and indeed up $Z$-mass). We also discuss sensitivities LHC and future colliders. Particularly shows promising searching for pseudo-scalar with $4 \lesssim m_a 60$ channel $pp...
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
Abstract With the establishment and maturation of experimental programs searching for new physics with sizeable couplings at LHC, there is an increasing interest in broader particle astrophysics community exploring light feebly-interacting particles as a paradigm complementary to New Physics sector TeV scale beyond. FIPs 2020 has been first workshop fully dedicated was held virtually from 31 August 4 September 2020. The gathered together experts collider, beam dump, fixed target experiments,...
With their high beam energy and intensity, existing near-future proton dumps provide an excellent opportunity to search for new very weakly coupled particles in the MeV GeV mass range. One particularly interesting example is a so-called axion-like particle (ALP), i.e. pseudoscalar two photons. The challenge reliably calculate production of from interactions composite objects, target atoms. In this work we argue that Primakoff ALPs proceeds momentum range where rates angular distributions can...
In this note we establish LHC limits on a variety of benchmark models for hidden sector physics using 2011 and 2012 data. First, consider "hidden" U(1) gauge boson under which all Standard Model particles are uncharged at tree-level interacts with the visible either via kinetic mixing or higher dimensional operators. Second, constrain scalar pseudo-scalar interacting dimension five operators Yukawa interactions, in particular including so-called axion-like particles. both cases several...
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark each their own beautiful structure, distinct particles, and forces. This review summarizes physics motivation sectors exciting opportunities experimental exploration. It is summary Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" Community...
The PVLAS signal has led to the proposal of many experiments searching for light bosons coupled photons. coupling strength probed by these near-future searches is, however, far from allowed region, if astrophysical bounds apply. But environmental conditions production axionlike particles in stars are very different those present laboratories. We consider case which and mass an particle depend on such as temperature matter density. This can relax several orders magnitude, just enough allow...
The cold dark matter of the Universe may be comprised very light and weakly interacting particles, so-called WISPs. Two prominent examples are hidden photons axion-like particles. In this note we propose a new technique to sensitively search for type with dish antennas. is broadband allows explore whole range masses in single measurement.
Recently, the laser experiments BMV and GammeV, searching for light shining through walls, have published data calculated new limits on allowed masses couplings axionlike particles. In this paper we point out that these can serve to constrain a much wider variety of hidden-sector particles such as, e.g., minicharged photons. The improve existing bounds from older BFRT experiment by factor 2. Moreover, use PVLAS constraints possible rotation ellipticity after it has passed strong magnetic...
Motivated by aLIGO's recent discovery of gravitational waves we discuss signatures new physics that could be seen at ground and space-based interferometers. We show a first order phase transition in dark sector would lead to detectable wave signal future experiments, if the has occurred temperatures few orders magnitude higher than electroweak scale. The source this case is associated with dynamics expanding colliding bubbles early universe. At same time point out topological defects, such...
Recently, indications for an emission line at 3.55 keV have been found in the combined spectra of a large number galaxy clusters and also Andromeda. This could not be identified with any known spectral line. It is tempting to speculate that it has its origin decay particle contributing all or part dark matter. In this paper we want point out axionlike particles being matter are ideal candidate produce such feature. More importantly parameter values necessary quite feasible extensions...
We determine limits from SN 1987A on massive axion-like particles (ALPs) with masses in the 10 keV - 100 MeV range and purely coupled to two photons. ALPs produced core collapse escape star decay into photons that can be observed as a delayed diffuse burst. discuss time angular distribution of such signal. Looking future we also estimate possible improvements if red supergiant Betelgeuse explodes supernova event.
A bstract The exploration of long-lived particles in the MeV-GeV region is a formidable task but it may provide us unique access to dark sectors. Fixed-target facilities with sufficiently energetic and intense proton beams are an ideal tool for this challenge. In work we show that production rate Axion-Like-Particles (ALPs) coupled pre-dominantly photons receives significant contribution from daughter-photons secondary π 0 η mesons created shower. We carefully compare PYTHIA simulated...
The cumulative emission of Axion-Like Particles (ALPs) from all past core-collapse supernovae (SNe) would lead to a diffuse flux with energies ${\mathcal O}(50)$ MeV. We use this constrain ALPs featuring couplings photons and nucleons. coupled only are produced in the SN core via Primakoff process, then converted into gamma rays Galactic magnetic field. set bound on $g_{a\gamma} \lesssim 5 \times 10^{-10}~{\rm GeV}^{-1}$ for $m_a 10^{-11}~{\rm eV}$, using recent measurements gamma-ray...
Possible extensions of the standard model particle physics suggest existence particles with small, unquantized electric charge. Photon-initiated pair production millicharged fermions in a magnetic field would manifest itself as vacuum (VM) dichroism. We show that laser polarization experiments searching for this effect yield, mass range below 0.1 eV, much stronger constraints on than previous laboratory searches. VM birefringence due to virtual gives slightly better constraint masses between...