Conveners
Session 1: Dark matter
- Caterina Doglioni (Lund University)
Session 1: Dark Matter
- Yue Meng (Shanghai Jiao Tong University)
Session 1: Dark matter
- Junwu Huang ()
Session 1: Dark matter
- Haipeng An (Tsinghua University)
Session 1: Gamma ryas
- Ruoyu LIU (Nanjing University)
Session 1: Galactic sources
- Ke FANG ()
Session 1: Neutrino
- Michael Larson (WISC -ICECUBE)
Session 1: Neurtino
- Aya Ishihara (Chiba University)
Session 1: Dark matter
- Fei Gao (Columbia University)
Session 1: Dark matter poster & Break
- There are no conveners in this block
Session 1: Dark matter
- Ning Zhou (Shanghai Jiaotong Univ.)
Dr
Shunichi Horigome
(Kavli IPMU)
26/10/2021, 15:00
oral
Dwarf spheroidal galaxies (dSphs) are known as promising candidates of the indirect detection of the WIMP dark matter. However, the sensitivity of the detection depends on an astrophysical factor, so-called $J$-factor, which has various statistical uncertainties. These uncertainties affect the sensitivity of the detection by a factor of O(10), thus we should consider these uncertainties to...
Dr
Moritz Huetten
(ICRR, The University of Tokyo)
26/10/2021, 15:20
oral
We present a search for dark matter (DM) spectral lines in the Galactic centre (GC) region with the MAGIC telescopes. MAGIC is a stereoscopic system of Atmospheric Cherenkov telescopes, located on the Canary island of La Palma (Spain) and sensitive to gamma rays in the energy range from 50 GeV to 50 TeV. Observations at high zenith angles significantly increase the telescopes’ collection area...
Mr
Alessandro Montanari
(CEA-Saclay / Irfu-DPhP / University Paris Saclay)
26/10/2021, 15:40
oral
The presence of dark matter (DM) in the universe is indicated by copious astrophysical and cosmological measurements, however, its underlying nature is still under debate. Among the most promising candidates to explain dark matter are weakly interacting massive particles (WIMPs), that have mass and coupling strength at the electroweak scale. If thermally produced in the early universe, WIMPs...
Alejandra Aguirre-Santaella
(IFT)
26/10/2021, 16:00
poster
TeV DM candidates are gradually earning more and more attention within the community. Among others, extra-dimensional brane-world models may produce thermal DM candidates with masses up to 100 TeV, which could be detected with the next generation of very-high-energy gamma-ray observatories such as the Cherenkov Telescope Array (CTA). In this work, we study the sensitivity of CTA to branon DM...
Daniel Salazar-Gallegos
(Michigan State University)
26/10/2021, 16:40
oral
The search for new physics beyond the Standard Model (SM) is closely tied to understanding the nature of Dark Matter (DM). Dwarf spheroidal galaxies (dSphs) are prime targets for indirect DM searches because their ratios of DM mass to baryonic mass is high. We present a novel combination analysis with multiple gamma-ray observatories. We established a collaboration of three Imaging Air...
Aion Viana
(IFSC-Universidade de São Paulo)
26/10/2021, 17:00
oral
Despite mounting evidence that dark matter (DM) exists in the Universe, its fundamental nature remains unknown. We present sensitivity estimates to detect DM particles with a future very-high-energy (≳ TeV) wide field-of-view gamma-ray observatory in the Southern Hemisphere, currently in its research and development phase under the name Southern Wide field-of-view Gamma-ray Observatory (SWGO)....
Barbara Skrzypek
(Harvard University)
26/10/2021, 17:40
oral
Observations of high-energy astrophysical neutrinos in IceCube have opened the door to multi-messenger astronomy, by way of which questions in particle physics could be explored through a combination of IceCube data and optical experiments such as Fermi-LAT. However, the origin of these astrophysical neutrinos is still largely unknown. Among the tensions that still need to be addressed, for...
Jeffrey Lazar
(Harvard University)
26/10/2021, 18:00
oral
In 2016 and 2018, the ANITA collaboration reported the observation of two anomalous events, with polarizations consistent with up-going neutrinos, but coming from too far below the horizon to actually make it through the Earth given their energies. While all Standard Model (SM) explanations of these events have been ruled out, explanations from beyond Standard Model scenarios have been put...
Alejandra Aguirre-Santaella
(IFT)
27/10/2021, 08:50
oral
In this work, we carry out a suite of specially-designed numerical simulations to shed further light on dark matter (DM) subhalo survival at mass scales relevant for gamma-ray DM searches, a topic subject to intense debate nowadays. Specifically, we have employed an improved version of DASH, a GPU N-body code, to study the evolution of low-mass subhalos inside a Milky Way-like halo with...
Shu Li
(TDLI, SJTU)
27/10/2021, 09:30
oral
The talk will present the physics motivation, the conceptual design and the latest R&D status of the Dark Photon search experiment at SHINE (i.e. Dark SHINE-暗光计划). The project will also have further physics program expansion for exotic muonium state search, LLP search and other BSM signatures to be explored.
Mr
Yun-Feng Liang
(Laboratory for Relativistic Astrophysics, Department of Physics, Guangxi University, Nanning 530004, China)
27/10/2021, 10:10
oral
Axion-like particles (ALPs) are hypothetical particles predicted by many extensions of the Standard Model and can also be candidates for dark matter. Many astrophysical phenomena are expected if ALPs exist. At GeV to TeV energies, they could lead to spectral oscillations of distant sources that travel across the external magnetic field. ALPs may also reduce the TeV opacity of the universe,...
Diyaselis Delgado Lopez
(Harvard University)
27/10/2021, 10:30
oral
Dark matter (DM) particles are predicted to decay into Standard Model particles which would produce signals of neutrinos, gamma-rays, and other secondary particles. Neutrinos provide an avenue to probe astrophysical sources of DM particles. We review the decay of dark matter into neutrinos over a range of dark matter masses from MeV/c2 to ZeV/c2. We examine the expected contributions to the...
Prof.
Nicole Bell
(The University of Melbourne)
27/10/2021, 10:50
oral
The capture of dark matter (DM) in neutron stars provides a cosmic laboratory in which to study the nature of dark matter particles and their interactions under extreme conditions. We outline an improved treatment of the dark matter capture process that incorporates a number of important, yet previously overlooked, physical effects, including momentum dependent form factors and baryon...
Dr
Chen Sun
(Tel Aviv University)
27/10/2021, 11:10
oral
In this talk, I will discuss possible constraints on the axion-photon coupling arising from supernova remnants. I will assume axions to be dark matter and focus on the gegenschein signals from their decay stimulated by radios emitted from supernova remnants. I will show that this could put competitive bounds in the axion mass range between $10^{-6}$ eV and $10^{-4}$ eV.
Yuchao Gu
(Nanjing University)
27/10/2021, 11:30
oral
The recent measurements of the cosmological parameter H0 from the direct local observations and the inferred value from the cosmic microwave background show approximately 4σ discrepancy. This may indicate new physics beyond the standard ΛCDM. We investigate the keV gravitino dark matter that has a small fraction of nonthermal components (e.g., from the late decay of...
Giacomo D\'Amico
(U)
27/10/2021, 15:00
oral
Signal estimation in the presence of background noise is a common problem in several scientific disciplines. An “on/off” measurement is performed when the background itself is not known, being estimated from a background control sample. In this work, we devise a novel reconstruction method, Bayesian analysis including single-event likelihoods (dubbed BASiL), for estimating the signal rate...
Saptashwa Bhattacharyya
(University of Nova Gorica)
27/10/2021, 15:25
oral
Due to the dominating presence of diffuse emission at GeV energies, detecting and localizing (faint) gamma-ray point sources in the Fermi-LAT data is a challenging task. Going beyond traditional statistical methods, here we show the application of deep learning and computer vision algorithms to localize and classify gamma-ray point sources starting from the raw Fermi-LAT sky images. We prepare...
Domenico della Volpe
(University of Geneva)
27/10/2021, 16:15
oral
The contribution will present the status of the project and some highlights of the first observational data.
Dr
Saverio Lombardi
(INAF-OAR and ASI-SSDC)
27/10/2021, 16:40
oral
The ASTRI Mini-Array is a next-generation Imaging Atmospheric Cherenkov Telescopes (IACTs) facility for gamma-ray astronomy in the energy band from a few TeV up to 100 TeV and beyond, under construction at the Teide Observatory (in the Canary Island of Tenerife, Spain). The project is led by the Italian *Istituto Nazionale di Astrofisica* (INAF) in collaboration with the *Fundación Galileo...
Gwenael Giacinti
(SWGO Collaboration)
27/10/2021, 17:05
oral
The Southern Wide-field Gamma-ray Observatory (SWGO) is the project to build a new extensive air shower particle detector for the observation of very-high-energy gamma-rays in South America. SWGO is currently planned for installation in the Southern Hemisphere, which grants it a unique science potential among ground-based gamma-ray
detectors. It will complement the capabilities of CTA,...
Stefano Vercellone
(I)
27/10/2021, 17:30
oral
Celestial sources emitting at high-energy (HE, E>100 MeV) and at very high-energy (VHE, E>100 GeV) are of the order of a few thousands and a few hundreds, respectively. The number of sources emitting at ultra high-energy (UHE, E> several tens of TeV) are just a few dozen, and are currently being investigated by means of both ground-based imaging atmospheric Cherenkov telescopes (IACTs) and...
Tomislav Terzić
(University of Rijeka, Department of PhysicsU)
27/10/2021, 17:55
oral
Lorentz invariance violation (LIV) is an exciting possible consequence of Quantum Gravity (QG). Detecting and measuring LIV would pose an invaluable input for understanding the nature of QG, and suggest a direction for further development of theoretical models describing it. If Lorentz symmetry is indeed violated, the effects thereof are minuscule, but cumulative. Therefore, very high energy...
Mr
Ben Li
(Nanjing University)
28/10/2021, 08:30
oral
The detection of extended TeV γ-ray emission (dubbed “TeV halos”) from Geminga and Monogem pulsars by HAWC collaboration implies that the halo-like morphologies around middle-aged pulsarsmay be common. The γ-rays above 10 TeV are thought to arise from inverse Compton (IC) scattering of relativistic electrons/positrons in the pulsar halos off cosmic microwave background photons. In...
Ramiro Torres-Escobedo
(SJTU, HAWC Collaboration)
28/10/2021, 08:50
oral
The local positron excess above 10 GeV measured by PAMELA, Fermi-LAT, and AMS-02 remains an essential question in the field of astroparticle physics. Dark matter particle decay/annihilation presents a viable mechanism to explain this positron excess. However, pulsars are also emitters of electrons/positrons. The HAWC collaboration studied the contribution from two-mid aged pulsars, Geminga and...
Dr
Qizuo WU
(Nanjing University)
28/10/2021, 09:10
oral
Extended TeV gamma-ray emission, which is also referred to as the TeV halo, has been discovered around the Geminga pulsar and a few other middle-aged pulsars. It is believed that the gamma-ray pulsar halo arises from the inverse Compton radiation of relativistic electrons escaping from the pulsar wind nebula. Therefore, the transport mechanism of these escaping electrons is crucial to...
Mr
Xuan-Han Liang
(Nanjing University)
28/10/2021, 09:30
oral
The Boomerang Nebula, a pulsar wind nebula associated with the supernova remnant G106.3+2.7, is a possible counterpart of the ultrahigh-energy gamma-ray source LHAASO J2226+6057. The SNR-PWN complex is considered as a PeVatron candidate, acting as a factory accelerating particles to PeV energies. In this work, we model the extended nonthermal X-ray emission around the pulsar PSR J2229+6114,...
Prof.
Zhongxiang Wang
(Yunnan University)
28/10/2021, 09:50
oral
We will present a γ-ray enhancement event detected from Tycho’s supernova remnant (SNR), which lasted for 1.5
years and showed a factor of 3.6 flux increase mainly in the energy range of 4–500 GeV. While several young SNRs (including Tycho’s SNR) were previously found to show peculiar X-ray structures with flux variations in one- or several-year timescales, such an event at γ-ray energies is...
Mr
xiao zhang
(Nanjing University)
28/10/2021, 10:10
oral
SNR G35.6-0.4 shows complex components in the radio bands and partially overlaps in space with an unidentified TeV source HESS J1858+020. In this study, we reanalyze CO, HI, and Fermi data toward SNR G35.6-0.4 region. The results obtained from the CO and HI data suggest that SNR G35.6-0.4 and HII region G35.6-0.5 locate at different distances. Based on the Fermi data, a GeV source (SrcB) is...
Cowen Doug
(The Pennsylvania State University)
29/10/2021, 08:40
oral
Kilometer-scale neutrino detectors, like the IceCube Neutrino Observatory deployed in the ice cap at the South Pole, are uniquely capable of detecting astrophysical tau neutrinos. IceCube has sensitivity to tau neutrinos with energies at and well above the threshold for tau lepton production, and has sufficiently large volume to contain tau leptons that travel hundreds of meters. The...
Pavel Zhelnin
(Harvard University)
29/10/2021, 09:00
oral
IceCube’s discovery of astrophysical neutrinos, and subsequent characterization of their energy spectrum up to a few PeV, has provided a new window to the high-energy Universe. A series of next-generation experiments aim to discover neutrinos with ultra-high energies, optimizing their sensitivity in the EeV range. However, many opportunities for discovery still remain in the study of the...
Susumu Inoue
(Bunkyo U. / RIKEN)
29/10/2021, 09:25
oral
Powerful, broadly collimated winds, likely driven by accretion disks around supermassive black holes (BHs), are observed in the majority of active galactic nuclei (AGN) and can play a crucial role in the evolution of AGN and their host galaxies. If some of the wind power is dissipated by shocks near the BH, protons can be thereby accelerated and undergo $p\gamma$ interactions with the AGN...
Mehr Un Nisa
(IceCube Neutrino Observatory)
29/10/2021, 10:30
oral
The originating sites of astrophysical neutrinos, diffuse extragalactic gamma rays, and ultra-high energy cosmic rays remain a largely unresolved puzzle. One class of astrophysical objects that could potentially provide a unified solution to the aforementioned mystery is galaxy clusters. Clusters of galaxies have been hypothesized as reservoirs of accelerated cosmic rays, which can interact...
Aswathi Balagopal V.
(IceCube Neutrino Observatory)
29/10/2021, 10:50
oral
The IceCube Neutrino Observatory observes neutrinos of both
astrophysical and atmospheric origin with energies above 100s of GeV.
DeepCore, the dense infill array of IceCube, also allows us to probe
neutrinos with lower energies, down to a few GeV. Using high energy (>1
TeV) and low energy (< 1 TeV) datasets curated for the search of
astrophysical sources, we can conduct follow-up...
Dr
Quanbu Gou
(Institute of High Energy Physics, CAS)
29/10/2021, 11:10
oral
High-energy transients, e.g., gamma-ray bursts (GRBs), supernovae, and blazars, are potential sources of high-energy cosmic rays. Neutrinos are a good probe of the origin of cosmic rays.
Horizontal air showers (HAS) are expected to be initiated by deeply penetrating high en-ergy particles such as neutrinos. Indeed, at large zenith angles the electromagnetic com-ponent of ordinary air showers...
Ibrahim Safa
(University of Wisconsin)
29/10/2021, 11:30
oral
Ultra-high energy neutrinos (>10^16 GeV) are expected to be produced through cosmic-ray interactions with the Cosmic Microwave Background (CMB). This so-called cosmogenic flux of UHE neutrinos is a target of the next generation neutrino observatories: IceCube-Gen2, TAMBO, RNOG, GRAND, POEMMA, and CHANT. Many of these detectors rely on measuring the neutrino interaction either directly at the...
Rajesh Kumar Maiti
(H)
29/10/2021, 15:00
oral
The Belle II experiment is in the unique position of probing a yet uncharted sector of particle physics, which includes hypothetical particles coupling very weekly with the standard model ones that might help explaining the nature of dark matter and other anomalies. Belle II analyzed 0.5 fb-1 of commissioning data to exclude part of the parameter space of models including low mass Z' bosons...
Deepak Kumar
(CERN)
29/10/2021, 15:40
oral
Dark matter can be sought in complementary experiments: direct detection, indirect detection and colliders all contribute to a comprehensive set of searches for weakly interacting massive particles (WIMPs). This talk presents the latest results from the searches for Dark Matter by the CMS experiment.
155.
Searches for dark matter with the ATLAS detector (joint abstract from Exotics, Higgs, and SUSY)
Changqiao LI
(中国科学技术大学)
29/10/2021, 16:00
oral
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM,...
Ruben Lopez-Coto
(I)
29/10/2021, 16:20
poster
The search for Primordial Black Hole (PBH) signatures is very broad in techniques, the origin of these signatures and in theories of PBH formation. Searches for imprints of evaporation involve several observables such as the Extragalactic Gamma-Ray background or direct measurement of different species of cosmic rays. Using these observables, one can put very tight constraints on the PBH...
Fei Gao
(Tsinghua University)
29/10/2021, 16:40
oral
To date, dark matter (DM) has only been observed through its gravitational interaction. Detection of a DM signal in an ultra-low background terrestrial detector will represent a ground-breaking discovery in physics and cosmology. The XENON collaboration has pioneered the development of liquid xenon time projection chambers and built a series of such detectors to lead the search for DM...
Scutti Federico
(The Australian National University)
29/10/2021, 17:00
oral
The SABRE (Sodium iodide with Active Background REjection) experiments aim to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals. The SABRE South experiment is located at the Stawell Underground Physics Laboratory (SUPL), Australia, and is the first deep underground laboratory in the Southern Hemisphere, due to be completed in late 2021.
...
Dr
Xiao Wang
(Sun Yat-sen University)
29/10/2021, 17:20
oral
The energy budget of cosmological first-order phase transition is essential for the gravitational wave spectra. Most of the previous studies are based on the bag model with same sound velocity in the symmetric and broken phase. We study the energy budget and the corresponding gravitational wave spectra beyond the bag model, where the sound velocities could be different in the symmetric and...
Bohua Li
(Tsinghua University)
29/10/2021, 17:40
oral
The recent NANOGrav finding of a common-spectrum process has invited interpretations as possible evidence of a primordial stochastic gravitational-wave background (SGWB)
stronger than predicted by standard inflation + $\Lambda$CDM. Such an SGWB would contribute an extra radiation component to the background Universe which may affect its expansion history. As such, it may help alleviate the...
