Description
Conveners:
- Julian Bautista (CPPM, Aix-Marseille Universitรฉ, CNRS/IN2P3)
- Simone Blasi (DESY Hamburg)
- Gwenhaรซl Wilberts Dewasseige (UCLouvain)
Contact: eps-hep2025-conveners-T01-l@in2p3.fr
The Pierre Auger Observatory has been on the astroparticle scene for over twenty years now. It's a mature player in this field, yet it retains all its vitality to provide data whose richness sheds light not only on the origin of ultra-high-energy cosmic rays (UHECRs), but also on high-energy hadronic interactions, multi-messenger astrophysics, beyond Standard Model (BSM) physics and...
Precision measurements by AMS reveal unique properties of cosmic charged elementary particles. In the absolute rigidity range ~60 to ~500 GV, the antiproton flux and proton flux have nearly identical rigidity dependence. This behavior indicates an excess of high energy antiprotons compared with secondary antiprotons produced from the collision of cosmic rays. More importantly, from ~60 to ~500...
We present high-precision measurements of cosmic ray nuclei spectra spanning elements from Z=1 (protons) through Z=20 (calcium), and including Z=26 (iron) and Z=28 (nickel), as measured by the Alpha Magnetic Spectrometer. The analysis reveals new properties concerning both primary and secondary cosmic rays, with particular emphasis on their distinctive spectral structures. These findings...
Analysis of anisotropy of the arrival directions of galactic positrons, electrons and protons has been performed with the Alpha Magnetic Spectrometer on the International Space Station. This measurement allows to differentiate between point-like and diffuse sources of cosmic rays for the understanding of the origin of high energy positrons. The AMS results of the dipole anisotropy are...
One of the open questions of astrophysics is the mass composition of ultra-high-energy cosmic rays (UHECRs). The flux of UHECRs is extremely low, demanding large observatories for indirect measurements of cosmic-ray air showers, cascades of secondary particles created by interactions of the cosmic ray with the atmosphere.
Located in Argentina, the Pierre Auger Observatory is the largest...
Gamma-ray astronomy offers a unique window into the most extreme environments of the Universe, enabling the study of cosmic particle acceleration, high-energy emission mechanisms, and potential signatures of dark matter and fundamental physics. In recent years, the field has witnessed significant progress, driven by observations from space-based instruments such as Fermi-LAT and ground-based...
The KM3NeT Collaboration is currently deploying two neutrino telescopes deep in the Mediterranean Sea. Both detectors share the same technology but are different in their size due to their different physics goals. The KM3NeT/ARCA telescope is located at about 3.5 km depth off-shore Sicily, Italy, while KM3NeT/ORCA is at about 2.5 km depth close to Toulon, France. The detectors are currently...
The Pierre Auger Observatory, the largest air-shower experiment in the world designed to investigate ultra-high-energy (UHE, E $\gtrsim10^{17}\,$eV) cosmic rays, offers unparalleled sensitivity to UHE photons. These are expected from interactions of UHE cosmic rays with background radiation fields, as well as from more exotic scenarios such as the decay of super-heavy dark matter (SHDM)...
The High-Energy Particle Detector 01 (HEPD-01) is one of the payloads on board the China Seismo-Electromagnetic Satellite (CSES-01). CSES-01 was the first multi-channel space observatory of a series of planned missions devoted to monitoring perturbations in electromagnetic fields, plasma and charged particle fluxes induced by natural sources and artificial emitters in near-Earth space. It was...
The Galactic plane is full of bright gamma-ray sources whose astrophysical nature remains unknown. The region surrounding the second most powerful pulsar in our galaxy, PSR J1813-1749, hosts one of such intriguing sources. Multiwavelength observations of this region show a multitude of sources, including a pulsar wind nebula (PWN) embedded in a supernova remnant (SNR) in X-rays and also SNRs...
The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) is set to begin survey operations by the end of this year.
This groundbreaking facility will transform our understanding of the universe across a broad range of science cases in optical astronomy. LSST will perform a comprehensive inventory of Solar System objects, including the identification of potentially hazardous...
Euclid is a mission of the European Space Agency designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. After its launch in July 1st, 2023 it is carrying out a wide area imaging and spectroscopy survey (the Euclid Wide Survey: EWS) in visible and near- infrared bands, covering approximately 15000 deg2 of extragalactic sky in six...
Euclid will observe 15000 deg2 of the darkest sky that is free of contamination by light from our Galaxy and our Solar System. Three โEuclid Deep Fieldsโ covering around 40 deg2 in total will be also observed extending the scientific scope of the mission the high-redshift universe. The complete survey represents hundreds of thousands images and several tens of Petabytes of data. About 10...
The duration of the neutrino burst from the supernova event SN 1987A is known to be sensitive to exotic sources of cooling, such as axions radiated from the dense and hot hadronic matter thought to constitute the inner core of the supernova. We perform the first quantitative study of the role of hadronic matter beyond the first generation -- in particular strange matter. We do so by...
The Next-to-Two-Higgs-Doublet model (N2HDM) has a rich vacuum structure where multiple electroweak (EW) breaking minima, as well as CP and electric-charge breaking minima, can coexist. These minima can be deeper than the electroweak vacuum $v_{ew} \approx 246\text{ GeV}$ of our universe, making our vacuum metastable. In such a case, one needs to calculate the tunneling rate from the EW vacuum...
Since the observation of the astrophysical neutrino flux reported by IceCube in 2013, neutrino astronomy has grown into a promising field of physics. High-energy neutrinos (E > 1 TeV) offer unique insight into the particle acceleration processes occurring within extreme astrophysical environments, forming an important component of multi-messenger astrophysics. Since 2013, IceCube has found...
The precision measurements of the cosmic-ray positron and electron fluxes collected by the Alpha Magnetic Spectrometer on the International Space Station are presented. The positron flux exhibits complex energy dependence. It is described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term, which...
The Pierre Auger Collaboration has performed a dedicated search for upward-going air showers using the Fluorescence Detector (FD), motivated by the two "anomalous" radio pulses reported by the ANITA experiment that are difficult to reconcile with expectations from the Standard Model. While ultrahigh-energy (UHE) neutrinos can traverse the Earth and initiate Earth-skimming showers interacting...
This year, the KM3NeT observatory published the detection of the most energetic neutrino candidate ever observed, with an energy between 72 PeV and 2.6 EeV at the 90% confidence level. This extreme energy makes the observed neutrino event very likely being of cosmic origin and not produced within the Earth's atmosphere. However, the exact origin is unknown. In this talk, the possibility that...
The POEMMA-Balloon with Radio (PBR) mission is a pathfinder project for the Probe Of Extreme Multi-Messenger Astrophysics (POEMMA), a proposed dual-satellite observatory designed to explore the highest energy regimes in the Universe. Scheduled for launch in Spring 2027 from Wanaka, New Zealand, PBR will fly aboard a NASA Super-Pressure Balloon for a mission duration of up to 50 days over the...
Understanding how new physics influences the dynamics of cosmic neutrinos is crucial in light of upcoming precise cosmological observations and the need to reconcile the complementarity between cosmological and laboratory probes. In this talk, I discuss novel insights on neutrino evolution in the presence of new physics at MeV temperatures - at the edge of the times that can be probed by BBN...
Pulsar Timing Array (PTA) collaborations use a collection of pulsars in the Milky Way to detect gravitational waves in the nanohertz band by measuring tiny shifts in pulse arrival times. In this talk, I will briefly summarise the recent strong evidence for a gravitational wave background, together with astrophysical and cosmological interpretations of the PTA observation. I will conclude by...
As of today, the LIGO-Virgo-KAGRA collaboration has cataloged nearly 200 GW detections from various compact object mergers. These discoveries began the endeavors to search for other kinds of GW sources. Among these, the Gravitational-Wave Background (GWB), arising as the superposition of individually undetectable cosmological and/or astrophysical sources, is one of the potential sources to...
We present the latest population-level results from the LIGO-Virgo-KAGRA (LVK) Collaboration, based on the growing catalog of gravitational-wave detections from compact binary coalescences. Leveraging data from the O1โO3 observing runs, and incorporating advanced statistical inference techniques, we explore the underlying astrophysical distributions of binary black holes (BBHs), binary neutron...
Several theories beyond the Standard Model predict the occurrence of Domain Walls (DW), topological defects expected to arise from the breaking of a discrete symmetry in the early universe. The motion and the eventual annihilation of these objects are expected to generate a stochastic background of gravitational waves (SGWB), that could in principle be probed by ground-based GW detectors. In...
Understanding the role played by primordial black holes (PBH) in our cosmological models is a crucial endeavor for the understanding of cosmological models. A key difficulty in studying PBHs is that that the notion drawn from the study of asymptotically flat and stationary black holes, such as the Schwarzschild and Kerr black hole solutions, are no longer available. PBH are asymptotically FLRW...
The deflection of light in the gravitational field of the Sun is one of the most fundamental consequences for general relativity as well as one of its classical tests first performed by Eddington a century ago. However, despite its center stage role in modern physics, no experiment has tested it in an ostensibly quantum regime where both matter and light exhibit non-classical features. This...
In March 2025, the Atacama Cosmology Telescope (ACT) released its last cosmological analysis along with a new cosmic microwave background (CMB) dataset. The sixth data release (DR6), including data collected from 2017 to 2022, covers 40% of the sky at arcminute resolution providing the most precise maps of CMB temperature and polarization. In this talk, I will give an overview of the ACT DR6...
The Dark energy Spectroscopic Instrument (DESI) is measuring spectra of millions of distant galaxies and
quasars over a five-year period that started in spring 2021. A 3D map of the universe is built from the observations
and statistical methods applied to this map allows to place strong constraints on the underlying cosmological
Model. The main probe used in the data analysis is the...
Heavy particle production through coupling with the inflaton field, during inflation, can lead to time-dependent and scale non-invariant curvature perturbations. These perturbations are preserved on superhorizon scales and imprint local temperature deviations, hot and cold spots, in the CMB.
Hot or cold spots can also be a result of tachyonic Higgs production, since the Standard Model Higgs...
With the immense number of images, data and sources that Euclid will deliver, the consortium will be in a unique position to create/provide/construct legacy catalogs, with exquisite imaging quality and superb Near Infrared Spectroscopy, with impact on may areas of galaxy science. This talk will review the current results and prospects that Euclid will be able to achieve in areas of Galaxy...
