-
Curvature Quantization based on the Ehrenfest Paradox in the Bohr Atomic Model Astropart. Phys. (IF 3.5) Pub Date : 2024-03-07 Fima Ardianto Putra, Ahmad Khalil Yaqubi, Riza Ibnu Adam, Vandan Wiliyanti, Puzi Anigrahawati
Ehrenfest Paradox has been studied in the Bohr Atomic Model as a theoretical procedure for expressing the atomic coordinate curvature in the term of electromagnetic fine structure/coupling constant α = 1/137. The strength of the curvature corresponding to the gravitational aspect depends on the principal quantum number via a new constant , which shows that the value of the curvature is quantised. For
-
The exact solution approach to warm inflation Astropart. Phys. (IF 3.5) Pub Date : 2024-02-28 Oem Trivedi
The theory of cosmic inflation has received a great amount of deserved attention in recent years due to it’s stunning predictions about the early universe. Alongside the usual cold inflation paradigm, warm inflation has garnered a huge amount of interest in modern inflationary studies. It’s peculiar features and specifically different predictions from cold inflation have led to a substantial amount
-
Analyses of continuous measurements of cosmic ray induced-neutrons spectra at the Concordia Antarctic Station from 2016 to 2024 Astropart. Phys. (IF 3.5) Pub Date : 2024-02-25 G, ., , H, u, b, e, r, t
This paper presents analyses of cosmic-ray-induced neutron measurements spanning from 2016 to 2023 at the Concordia Antarctic high-altitude station. Environmental and systematic effects are meticulously considered in both long-term and short-term perspectives. The study delves into space weather cases, focusing on solar events in September 2017 and October 2021, along with a specific examination of
-
The performance of generalised Davies–Cotton optical systems with infinitesimal mirror facets Astropart. Phys. (IF 3.5) Pub Date : 2024-02-19 S. Fegan
This paper presents Taylor expansions for the imaging and timing characteristics of spherical optical systems with infinitesimal mirror facets, sometimes referred to as “modified Davies–Cotton” telescopes. Such a system comprises a discontinuous spherical mirror surface whose curvature radius is different from its focal length, and whose mirrors are aligned to suppress spherical aberration. Configurations
-
The cosmic ray energetics and mass for the international space station (ISS-CREAM) instrument Astropart. Phys. (IF 3.5) Pub Date : 2024-02-15 Y.S. Yoon, Y. Amare, D. Angelaszek, N. Anthony, K. Cheryian, G.H. Choi, M. Copley, S. Coutu, L. Derome, L. Eraud, L. Hagenau, J.H. Han, H.G. Huh, Y.S. Hwang, H.J. Hyun, S. Im, H.B. Jeon, J.A. Jeon, S. Jeong, S.C. Kang, H.J. Kim, K.C. Kim, M.H. Kim, H.Y. Lee, J. Lee, M.H. Lee, J. Liang, L. Lu, L. Lutz, A. Menchaca-Rocha, J.W. Mitchell, S.I. Mognet, S. Morton, M. Nester, S. Nutter, H. Park, I.H. Park
The ISS-CREAM instrument is the modified version of the Cosmic Ray Energetics And Mass (CREAM) experiment, which was flown on balloons multiple times over Antarctica and later installed on the International Space Station (ISS). Its primary objective is to measure the energy spectra of individual cosmic-ray elements for the charge range of = 1 to = 26, in the energy range of ∼ 10 to ∼ 10 eV. The instrument
-
Machine learning-based discrimination of bulk and surface events of germanium detectors for light dark matter detection Astropart. Phys. (IF 3.5) Pub Date : 2024-02-12 P. Zhang, H. Ma, L. Yang, Z. Zeng, Q. Yue, J. Cheng
Surface events that exhibit incomplete charge collection are an essential background source in the light dark matter detection experiments with p-type point-contact germanium detectors. We propose a machine learning-based algorithm to identify bulk and surface events according to their pulse shape features. We construct the training and test set with part of the -source calibration data and use the
-
-
Systematic effects on a Compton polarimeter at the focus of an X-ray mirror Astropart. Phys. (IF 3.5) Pub Date : 2024-02-10 M. Aoyagi, R.G. Bose, S. Chun, E. Gau, K. Hu, K. Ishiwata, N.K. Iyer, F. Kislat, M. Kiss, K. Klepper, H. Krawczynski, L. Lisalda, Y. Maeda, F. af Malmborg, H. Matsumoto, A. Miyamoto, T. Miyazawa, M. Pearce, B.F. Rauch, N. Rodriguez Cavero, S. Spooner, H. Takahashi, Y. Uchida, A.T. West, K. Wimalasena, M. Yoshimoto
XL-Calibur is a balloon-borne Compton polarimeter for X-rays in the 15–80 keV range. Using an X-ray mirror with a 12 m focal length for collecting photons onto a beryllium scattering rod surrounded by CZT detectors, a minimum-detectable polarization as low as 3% is expected during a 24-hour on-target observation of a 1 Crab source at 45° elevation.
-
Alpha backgrounds in NaI(Tl) crystals of COSINE-100 Astropart. Phys. (IF 3.5) Pub Date : 2024-02-09 G. Adhikari, N. Carlin, D.F.F.S. Cavalcante, J.Y. Cho, J.J. Choi, S. Choi, A.C. Ezeribe, L.E. França, C. Ha, I.S. Hahn, S.J. Hollick, E.J. Jeon, H.W. Joo, W.G. Kang, M. Kauer, B.H. Kim, H.J. Kim, J. Kim, K.W. Kim, S.H. Kim, S.K. Kim, S.W. Kim, W.K. Kim, Y.D. Kim, Y.H. Kim, Y.J. Ko, D.H. Lee, E.K. Lee, H. Lee, H.S. Lee, H.Y. Lee, I.S. Lee, J. Lee, J.Y. Lee, M.H. Lee, S.H. Lee, S.M. Lee, Y.J. Lee, D
COSINE-100 is a dark matter direct detection experiment with 106kg NaI(Tl) as the target material. Pb and daughter isotopes are a dominant background in the WIMP region of interest and are detected via decay and decay. Analysis of the channel complements the background model as observed in the / channel. We present the measurement of the quenching factors and Monte Carlo simulation results and activity
-
A novel energy reconstruction method for the MAGIC stereoscopic observation Astropart. Phys. (IF 3.5) Pub Date : 2024-02-07 Kazuma Ishio, David Paneque
We report the successful development of a novel methodology of energy reconstruction for very high energy gamma rays detected with Imaging Atmospheric Cherenkov Telescopes (IACTs). This methodology, based on the machine learning algorithm Random Forest, and named RF-Erec, has been adjusted for being used with data from the Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) stereo telescope system
-
The expected potential of hadronic PeVatron searches with spectral [formula omitted]-ray data from the Southern Wide-field Gamma-ray Observatory Astropart. Phys. (IF 3.5) Pub Date : 2024-02-03 Ekrem Oğuzhan Angüner, Tülün Ergin
The presence of a spectral softening, occurring at 3 PeV energies, seen in the local cosmic-ray energy spectrum provides an evidence that our Galaxy hosts astrophysical objects, known as ’hadronic PeVatrons’, that are capable of accelerating hadrons to PeV energies and above. Recent results from ground-based particle detector array experiments have provided conclusive evidence that these facilities
-
Neutron-star measurements in the multi-messenger Era Astropart. Phys. (IF 3.5) Pub Date : 2024-02-03 Stefano Ascenzi, Vanessa Graber, Nanda Rea
Neutron stars are compact and dense celestial objects that offer the unique opportunity to explore matter and its interactions under conditions that cannot be reproduced elsewhere in the Universe. Their extreme gravitational, rotational and magnetic energy reservoirs fuel the large variety of their emission, which encompasses all available multi-messenger tracers: electromagnetic and gravitational
-
Adaptive kernel density estimation for improved sky map computation in gamma-ray astronomy Astropart. Phys. (IF 3.5) Pub Date : 2024-02-03 M. Holler, T. Mitterdorfer, S. Panny
We introduce an alternative method for the calculation of sky maps from data taken with gamma-ray telescopes. In contrast to the established method of smoothing the 2D histogram of reconstructed event directions with a static kernel, we apply a Kernel Density Estimation (KDE) where the kernel size of each gamma-ray candidate is related to its estimated direction uncertainty. Exploiting this additional
-
Exploring one giga electronvolt cosmic gamma rays with a Cherenkov plenoscope capable of recording atmospheric light fields, Part 1: Optics Astropart. Phys. (IF 3.5) Pub Date : 2024-01-30 Sebastian Achim Mueller, Spyridon Daglas, Axel Arbet Engels, Max Ludwig Ahnen, Dominik Neise, Adrian Egger, Eleni Chatzi, Adrian Biland, Werner Hofmann
Detecting cosmic gamma rays at high rates is the key to time-resolve the acceleration of particles within some of the most powerful events in the universe. Time-resolving the emission of gamma rays from merging celestial bodies, apparently random bursts of gamma rays, recurring novas in binary systems, flaring jets from active galactic nuclei, clocking pulsars, and many more became a critical contribution
-
-
Inflection point of coupled quintessence Astropart. Phys. (IF 3.5) Pub Date : 2024-01-12 Jaskirat Kaur, S.D. Pathak, Vikash Kumar Ojha, Maxim Yu Khlopov
In this paper, we investigate the behavior of coupled quintessence at inflection point in the accelerated expansion of the universe. We consider spatially homogeneous quintessence coupled with the matter with two coupling parameters as Q=3αHρm and Q=3βρṁ. We obtain the inflection point for the power law form of potential V(ϕ)=V3(ϕ−ϕ0)3 and its generalized form in two coupled quintessence models.
-
Energy spectra of the first TGE observed on Zugspitze by the SEVAN light detector compared with the energetic TGE observed on Aragats Astropart. Phys. (IF 3.5) Pub Date : 2024-01-03 A. Chilingarian, T. Karapetyan, B. Sargsyan, J. Knapp, M. Walter, T. Rehm
The energy spectra of Thunderstorm ground enhancement (TGE) electrons and gamma rays are the key evidence for proving the origin of enhanced particle fluxes from thunderclouds. Till now, the electron energy spectrum was measured only by the Aragats large scintillation spectrometer ASNT. We changed the electronics board of the SEVAN detector installed at the Umwelt-Forschungs-Station (UFS, Schneefernerhaus
-
Non-oscillating early dark energy and quintessence from α-attractors Astropart. Phys. (IF 3.5) Pub Date : 2024-01-05 Lucy Brissenden, Konstantinos Dimopoulos, Samuel Sánchez López
Early dark energy (EDE) is one of the most promising possibilities in order to resolve the Hubble tension: the discrepancy between the locally measured and cosmologically inferred values of the Hubble constant. In this paper we propose a toy model of unified EDE and late dark energy (DE), driven by a scalar field in the context of α-attractors. The field provides an injection of a subdominant dark
-
Proof of principle for template synthesis approach for the radio emission from vertical extensive air showers Astropart. Phys. (IF 3.5) Pub Date : 2023-12-30 Mitja Desmet, Stijn Buitink, Tim Huege, David Butler, Ralph Engel, Olaf Scholten
The radio detection technique of cosmic ray air showers has gained renewed interest in the last two decades. While the radio experiments are very cost-effective to deploy, the Monte-Carlo simulations required to analyse the data are computationally expensive. Here we present a proof of concept for a novel way to synthesise the radio emission from extensive air showers in simulations. It is a hybrid
-
Autonomous observation, control, data acquisition and monitoring of MACE telescope Astropart. Phys. (IF 3.5) Pub Date : 2023-12-28 Anushri Jain, Shikha Srivastava, Mahesh P․, J. Deshpande, Padmini S․
Major Atmospheric Cherenkov Experiment (MACE) is a large telescope commissioned at Ladakh region of India. It consists of many subsystems operating in synchronization to perform successful observations. The paper introduces a robust, concise and autonomous operator console to operate, control and monitor the entire experiment, providing workflow management, autonomous schedule-based observation, orchestration
-
Glitching pulsars as gravitational wave sources Astropart. Phys. (IF 3.5) Pub Date : 2023-12-26 B. Haskell, D.I. Jones
Spinning neutron stars, when observed as pulsars, are seen to undergo occasional spin-up events known as glitches. Despite several decades of study, the physical mechanisms responsible for glitches are still not well understood, but probably involve an interplay between the star’s outer elastic crust, and the superfluid and superconducting core that lies within. Glitches will be accompanied by some
-
Thermodynamic topology and photon spheres in the hyperscaling violating black holes Astropart. Phys. (IF 3.5) Pub Date : 2023-12-21 Jafar Sadeghi, Mohammad Ali S. Afshar, Saeed Noori Gashti, Mohammad Reza Alipour
It was shown that a standard ring of light can be imagined outside the event horizon for stationary rotating four-dimensional black holes with axial symmetry using the topological method (Cunha, 2020; Wei and Shao-Wen, 2020). Based on this concept, in this paper, we investigate the topological charge and the conditions of existence of the photon sphere (PS) for a hyperscaling violation (HSV) black
-
Ancestral spin information in gravitational waves from black hole mergers Astropart. Phys. (IF 3.5) Pub Date : 2023-12-11 O. Barrera, I. Bartos
The heaviest black holes discovered through gravitational waves have masses that are difficult to explain with current standard stellar models. This discrepancy may be due to a series of hierarchical mergers, where the observed black holes are themselves the products of previous mergers. Here we present a method to estimate the masses and spins of previous generations of black holes based on the masses
-
-
Enabling kilonova science with Nancy Grace Roman Space Telescope Astropart. Phys. (IF 3.5) Pub Date : 2023-10-04 Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell, Mattia Bulla, Andrew Toivonen, Leo P. Singer, Antonella Palmese, E. Burns, Suvi Gezari, Mansi M. Kasliwal, R. Weizmann Kiendrebeogo, Ashish Mahabal, Takashi J. Moriya, Armin Rest, Dan Scolnic, Robert A. Simcoe, Jamie Soon, Robert Stein, Tony Travouillon
Binary neutron star mergers and neutron star–black hole mergers are multi-messenger sources that can be detected in gravitational waves and in electromagnetic radiation. The low electron fraction of neutron star merger ejecta favors the production of heavy elements such as lanthanides and actinides via rapid neutron capture (r-process). The decay of these unstable nuclei powers an infrared-bright transient
-
Forecasts analysis on varying-α theories from gravitational wave standard sirens Astropart. Phys. (IF 3.5) Pub Date : 2023-10-07 L.R. Colaço, R.F.L. Holanda, Rafael C. Nunes, J.E. Gonzalez
Motivated by future gravitational waves observations, we perform forecasts analysis to constrain a possible time variation of the fine structure constant (α) within the context of the so-called runaway dilaton model. For this purpose, some gravitational-wave standard sirens mock data within the perspective of Einstein Telescope and LISA mission were considered jointly with current strong gravitational
-
Life cycle analysis of the GRAND experiment Astropart. Phys. (IF 3.5) Pub Date : 2023-09-26 Leidy T. Vargas-Ibáñez, Kumiko Kotera, Odile Blanchard, Peggy Zwolinski, Alexis Cheffer, Mathieu Collilieux, Paul Lambert, Quentin Lefèbvre, Thomas Protois
The goal of our study is to assess the environmental impact of the installation and use of the Giant Radio Array for Neutrino Detection (GRAND) prototype detection units, based on the life cycle assessment (LCA) methodology, and to propose recommendations that contribute to reduce the environmental impacts of the project at later stages. The functional unit, namely the quantified description of the
-
A study on performance boost of a 17 m class Cherenkov telescope with a SiPM-based camera Astropart. Phys. (IF 3.5) Pub Date : 2023-09-23 Cornelia Arcaro, Michele Doro, Julian Sitarek, Dominik Baack
The current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs), comprised of major installations such as the MAGIC, H.E.S.S. and VERITAS telescopes, is sometimes called the 3rd generation of such instruments. These telescopes use multipixel cameras composed of hundreds up to thousands photomultiplier tubes (PMTs). The supremacy of PMTs is currently being challenged by photon sensors, rapidly
-
Avoiding parameter fine-tuning in mass varying neutrino models of DE? Astropart. Phys. (IF 3.5) Pub Date : 2023-09-16 Michael Maziashvili, Vakhtang Tsintsabadze
Coupled models of quintessence are usually introduced for avoiding or mitigating the parameter fine-tuning problem. At the same time, the coupled models should avoid the fine-tuning problem related to the initial conditions as quintessence models do. One more attractive feature of coupled models might be the explanation of the timescale at which the coincidence of DE and matter energy densities occur
-
GRMHD study of accreting massive black hole binaries in astrophysical environment: A review Astropart. Phys. (IF 3.5) Pub Date : 2023-09-04 Federico Cattorini, Bruno Giacomazzo
We present an overview of recent numerical advances in the theoretical characterization of massive binary black hole (MBBH) mergers in astrophysical environments. These systems are among the loudest sources of gravitational waves (GWs) in the universe and particularly promising candidates for multimessenger astronomy. Coincident detection of GWs and electromagnetic (EM) signals from merging MBBHs is
-
EUSO-SPB1 mission and science Astropart. Phys. (IF 3.5) Pub Date : 2023-09-04 G. Abdellaoui, S. Abe, J.H. Adams, D. Allard, G. Alonso, L. Anchordoqui, A. Anzalone, E. Arnone, K. Asano, R. Attallah, H. Attoui, M. Ave Pernas, R. Bachmann, S. Bacholle, M. Bagheri, M. Bakiri, J. Baláz, D. Barghini, S. Bartocci, M. Battisti, A. Zuccaro Marchi
The Extreme Universe Space Observatory on a Super Pressure Balloon 1 (EUSO-SPB1) was launched in 2017 April from Wanaka, New Zealand. The plan of this mission of opportunity on a NASA super pressure balloon test flight was to circle the southern hemisphere. The primary scientific goal was to make the first observations of ultra-high-energy cosmic-ray extensive air showers (EASs) by looking down on
-
-
Detection of high energy X-ray radiation following muon captures on Pb Astropart. Phys. (IF 3.5) Pub Date : 2023-08-22 S. Ilić, M. Krmar, D. Knežević, D. Maletić, N. Jovančević
Low background HPGe detector, shielded by lead, was used to collect background gamma spectra for more than 180 days. Three lines, originating from transitions of muons captured in orbitals of lead atoms were for the first time recognized in background spectra. Relative intensities of detected transitions were calculated and compared with the theoretical prediction.
-
Sensitivities for coherent elastic scattering of solar and supernova neutrinos with future NaI(Tl) dark matter search detectors of COSINE-200/1T Astropart. Phys. (IF 3.5) Pub Date : 2023-08-07 Young Ju Ko, Hyun Su Lee
We investigate the prospects for measuring the coherent elastic neutrino–nucleus scattering of solar and supernova neutrinos in future NaI(Tl) dark matter detection experiments. Considering the reduced background and improved light yield of the recently developed NaI(Tl) crystals, more than 3σ observation sensitivities of the supernova neutrino within the Milky Way are demonstrated. In the case of
-
Searches for continuous gravitational waves from neutron stars: A twenty-year retrospective Astropart. Phys. (IF 3.5) Pub Date : 2023-07-20 Karl Wette
Seven years after the first direct detection of gravitational waves, from the collision of two black holes, the field of gravitational wave astronomy is firmly established. A first detection of continuous gravitational waves from rapidly-spinning neutron stars could be the field’s next big discovery. I review the last twenty years of efforts to detect continuous gravitational waves using the LIGO and
-
MOONRAY: A permanent high-energy cosmic-ray observatory on the surface of the Moon Astropart. Phys. (IF 3.5) Pub Date : 2023-07-12
The forthcoming decades will see a rapid development of space programs aiming at the implementation of habitats on our satellite. Therefore it makes sense to evaluate the feasibility of a permanent cosmic-ray (CR) observatory on the Moon. Its large sensitive area would allow to carry out a very rich observational program over a time span of a few decades with an unprecedented energy reach. A thorough
-
Study of cosmogenic activation above ground for the DarkSide-20k experiment Astropart. Phys. (IF 3.5) Pub Date : 2023-06-28 A. Elersich, P. Agnes, I. Ahmad, S. Albergo, I.F.M. Albuquerque, T. Alexander, A.K. Alton, P. Amaudruz, M. Atzori Corona, M. Ave, I.Ch. Avetisov, O. Azzolini, H.O. Back, Z. Balmforth, A. Barrado-Olmedo, P. Barrillon, A. Basco, G. Batignani, V. Bocci, W.M. Bonivento, M.P. Zykova
The activation of materials due to exposure to cosmic rays may become an important background source for experiments investigating rare event phenomena. DarkSide-20k, currently under construction at the Laboratori Nazionali del Gran Sasso, is a direct detection experiment for galactic dark matter particles, using a two-phase liquid-argon Time Projection Chamber (TPC) filled with 49.7 tonnes (active
-
Study of longitudinal development of air showers in the knee energy range Astropart. Phys. (IF 3.5) Pub Date : 2023-06-28 Feng Zhang, Hu Liu, Fengrong Zhu, Jacob Oloketuyi
Ground-based cosmic ray experiments detect cosmic ray mainly by measuring the longitudinal and lateral distribution of secondary particles produced in the extensive air shower (EAS). The EAS of cosmic ray in the knee energy region is simulated via CORSIKA software. Several simulation samples with different energy, composition and zenith angles were carried out to understand the longitudinal development
-
Tensor fluctuations in the early universe Astropart. Phys. (IF 3.5) Pub Date : 2023-06-16 F. Melia
In standard inflationary cosmology, scalar and tensor perturbations grew as the Universe expanded and froze when their wavelengths exceeded the Hubble horizon, producing a tell-tale signature in the fluctuation spectrum and amplitude of the cosmic microwave background (CMB). But there are now very good reasons to examine whether structure formation could also have begun via the seeding of quantum fluctuations
-
-
Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models Astropart. Phys. (IF 3.5) Pub Date : 2023-05-29 E. Kido, T. Inakura, M. Kimura, N. Kobayashi, S. Nagataki, N. Shimizu, A. Tamii, Y. Utsuno
Photodisintegration is a main energy loss process for ultrahigh-energy cosmic-ray (UHECR) nuclei in intergalactic space. Therefore, it is crucial to understand systematic uncertainty in photodisintegration when simulating the propagation of UHECR nuclei. In this work, we calculated the cross sections using the random phase approximation (RPA) of density functional theory (DFT), a microscopic nuclear
-
Phenomenological implications of sterile neutrinos in the μνSSM and dark matter Astropart. Phys. (IF 3.5) Pub Date : 2023-05-16 Paulina Knees, Daniel E. López-Fogliani, Carlos Muñoz
We analyze the role of sterile neutrinos in the framework of the μνSSM, where the presence of right-handed neutrinos provides a simultaneous solution to μ- and ν-problems in supersymmetry. We adopt a minimalistic approach, reproducing light neutrino masses and mixing angles at tree-level using just two right-handed neutrinos as part of the seesaw mechanism. A third right-handed neutrino does not contribute
-
Analytic approach to axion-like-particle emission in core-collapse supernovae Astropart. Phys. (IF 3.5) Pub Date : 2023-05-16 Ana Luisa Foguel, Eduardo S. Fraga
We investigate the impact of a presumed axion-like-particle (ALP) emission in a core-collapse supernova explosion on neutrino luminosities and mean energies employing a relatively simple analytic description. We compute the nuclear Bremsstrahlung and Primakoff axion luminosities as functions of the protoneutron star (PNS) parameters and discuss how the ALP luminosities compete with the neutrino emission
-
The energy spectrum of cosmic rays measured by the Telescope Array using 10 years of fluorescence detector data Astropart. Phys. (IF 3.5) Pub Date : 2023-05-11 R.U. Abbasi, Y. Abe, T. Abu-Zayyad, M. Allen, Y. Arai, R. Arimura, E. Barcikowski, J.W. Belz, D.R. Bergman, S.A. Blake, I. Buckland, B.G. Cheon, M. Chikawa, A. Fedynitch, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, Z. Zundel
The Telescope Array (TA) Cosmic Ray Observatory is the largest cosmic ray detector in the northern hemisphere. TA was built to study ultra-high-energy cosmic rays (UHECRs), cosmic rays with energies above 1018eV. TA is a hybrid detector, employing two distinct detection methods: a surface detector array and a set of fluorescence telescopes. We will present a measurement of the cosmic ray energy spectrum
-
Bracketing the direct detection exclusion plot for a WIMP of spin one half in non-relativistic effective theory Astropart. Phys. (IF 3.5) Pub Date : 2023-04-29 Sunghyun Kang, Injun Jeong, Stefano Scopel
Assuming a standard Maxwellian velocity distribution for the WIMPs in the halo of our Galaxy we use the null results of an exhaustive set of 9 direct detection experiments to calculate the maximal variation of the exclusion plot for each Wilson coefficient of the most general Galilean–invariant effective Hamiltonian for a WIMP of spin one half due to interferences. We consider 56 Wilson coefficients
-
The MIGDAL experiment: Measuring a rare atomic process to aid the search for dark matter Astropart. Phys. (IF 3.5) Pub Date : 2023-04-23 H.M. Araújo, S.N. Balashov, J.E. Borg, F.M. Brunbauer, C. Cazzaniga, C.D. Frost, F. Garcia, A.C. Kaboth, M. Kastriotou, I. Katsioulas, A. Khazov, H. Kraus, V.A. Kudryavtsev, S. Lilley, A. Lindote, D. Loomba, M.I. Lopes, E. Lopez Asamar, P. Luna Dapica, P.A. Majewski, R. Veenhof
We present the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment aiming at the unambiguous observation and study of the so-called Migdal effect induced by fast-neutron scattering. It is hoped that this elusive atomic process can be exploited to enhance the reach of direct dark matter search experiments to lower masses, but it is still lacking experimental confirmation. Our goal is to detect
-
High redshift constraints on extended logotropic models Astropart. Phys. (IF 3.5) Pub Date : 2023-04-23 Hachemi B. Benaoum, Pierre-Henri Chavanis, Orlando Luongo, Marco Muccino, Hernando Quevedo
A single logotropic fluid, responsible for the existence of the whole dark sector, is here extensively revised at intermediate redshifts. In particular, by investigating possible generalizations that conceptually overcome previous issues of standard logotropic scenarios, we fix bound over classes of logotropic models that exhibit additional terms in the equation of state. Employing σ8 measurements
-
Low-mass extension of direct detection bounds on WIMP-quark and WIMP-gluon effective interactions using the Migdal effect Astropart. Phys. (IF 3.5) Pub Date : 2023-04-05 Gaurav Tomar, Sunghyun Kang, Stefano Scopel
Updating a previous analysis where we used elastic nuclear recoils we study the Migdal effect to extend to low WIMP masses the direct detection bounds to operators up to dimension 7 of the relativistic effective field theory describing WIMP interactions with quarks and gluons. To this aim we include in our analysis the data of the XENON1T, SuperCDMS, COSINE-100, and DarkSide-50 experiments and assume
-
Sensitivity of the Cherenkov Telescope Array to spectral signatures of hadronic PeVatrons with application to Galactic Supernova Remnants Astropart. Phys. (IF 3.5) Pub Date : 2023-03-24 , F. Acero, A. Acharyya, R. Adam, A. Aguasca-Cabot, I. Agudo, A. Aguirre-Santaella, J. Alfaro, R. Aloisio, N. Álvarez Crespo, R. Alves Batista, L. Amati, E. Amato, G. Ambrosi, E.O. Angüner, C. Aramo, C. Arcaro, T. Armstrong, K. Asano, Y. Ascasibar, M. Z̆ivec
The local Cosmic Ray (CR) energy spectrum exhibits a spectral softening at energies around 3 PeV. Sources which are capable of accelerating hadrons to such energies are called hadronic PeVatrons. However, hadronic PeVatrons have not yet been firmly identified within the Galaxy. Several source classes, including Galactic Supernova Remnants (SNRs), have been proposed as PeVatron candidates. The potential
-
Universality of Cherenkov light in EAS Astropart. Phys. (IF 3.5) Pub Date : 2023-03-01 Isaac J. Buckland, D.R. Bergman
The reconstruction of cosmic-ray-induced extensive air showers with a non-imaging Cherenkov detector array requires knowledge of the Cherenkov yield of any given air shower for a given set of shower parameters. Although air showers develop in a stochastic cascade, certain characteristics of the particles in the shower have been shown to come from universal probability distributions, a property known
-
Lorentz invariance violation induced threshold anomaly versus very-high energy cosmic photon emission from GRB 221009A Astropart. Phys. (IF 3.5) Pub Date : 2023-02-21 Hao Li, Bo-Qiang Ma
It has been reported that the Large High Altitude Air Shower Observatory (LHAASO) observed very high energy photons from GRB 221009A, with the highest energy reaching 18 TeV. We find that observation of such high energy photons is quite nontrivial since extragalactic background light could absorb these photons severely and the flux is too weak to be observed. Therefore we discuss a potential mechanism
-
Criticality and phase transition of Kerr–anti-de Sitter black hole with quintessence and cloud of strings Astropart. Phys. (IF 3.5) Pub Date : 2023-02-14 Qanitah Ama-Tul-Mughani, Rabia Saleem, Wardat Us Salam, Sobia Sadiq
In this paper, a thermodynamical study of the Kerr–anti-de Sitter (KAdS) black hole (BH) encircled by quintessence matter and the cloud of strings is presented. We check the effects of the cloud parameter on the thermodynamical variables including Hawking temperature, entropy, Helmholtz free energy (HFE), Gibbs free energy (GFE), and specific heat capacity. These thermodynamic variables hold the Smarr–Gibbs–Dehum
-
Connecting multi-lepton anomalies at the LHC and in Astrophysics with MeerKAT/SKA Astropart. Phys. (IF 3.5) Pub Date : 2023-02-06 Geoff Beck, Ralekete Temo, Elias Malwa, Mukesh Kumar, Bruce Mellado
Multi-lepton anomalies at the Large Hadron Collider (LHC) are reasonably well described by a two Higgs doublet model with an additional singlet scalar. Here we demonstrate that using this model, with parameters set by the LHC, we are also able to describe the excesses in gamma-ray flux from the galactic centre and the cosmic-ray spectra from AMS-02. This is achieved through Dark Matter (DM) annihilation
-
Analytic fluid approximation for warm dark matter Astropart. Phys. (IF 3.5) Pub Date : 2023-02-01
We present the cosmological evolution of the velocity of a massive particle, along with its equation of state. Both quantities are expressed in terms of anr, the moment when a massive particle becomes nonrelativistic. The expressions for the energy density and pressure for the background evolution are also in terms of anr; therefore, the perturbation equations for any massively decoupled particle,
-
Ultra high energy cosmic rays The intersection of the Cosmic and Energy Frontiers Astropart. Phys. (IF 3.5) Pub Date : 2023-02-02 A. Coleman, J. Eser, E. Mayotte, F. Sarazin, F.G. Schröder, D. Soldin, T.M. Venters, R. Aloisio, J. Alvarez-Muñiz, R. Alves Batista, D. Bergman, M. Bertaina, L. Caccianiga, O. Deligny, H.P. Dembinski, P.B. Denton, A. di Matteo, N. Globus, J. Glombitza, G. Golup, M. Zotov
The present white paper is submitted as part of the “Snowmass” process to help inform the long-term plans of the United States Department of Energy and the National Science Foundation for high-energy physics. It summarizes the science questions driving the Ultra-High-Energy Cosmic-Ray (UHECR) community and provides recommendations on the strategy to answer them in the next two decades.
-
Cosmic-ray measurements with an array of Cherenkov telescopes using reconstruction of longitudinal profiles of air showers Astropart. Phys. (IF 3.5) Pub Date : 2023-01-24 Andrés G. Delgado Giler, Vitor de Souza
We present a method to reconstruct the longitudinal profile of electrons in showers using Cherenkov telescopes. We show how the Cherenkov light collected by an array of telescopes can be transformed into the number of electrons as a function of atmospheric depth. This method is validated using air shower and simplified telescope simulations. The reconstruction of the depth in which the shower has the
-
A new ultra low-level HPGe activity counting setup in the Felsenkeller shallow-underground laboratory Astropart. Phys. (IF 3.5) Pub Date : 2023-01-20 S. Turkat, D. Bemmerer, A. Boeltzig, A.R. Domula, J. Koch, T. Lossin, M. Osswald, K. Schmidt, K. Zuber
A new ultra low-level counting setup has been installed in the shallow-underground laboratory Felsenkeller in Dresden, Germany. It includes a high-purity germanium detector (HPGe) of 163% relative efficiency within passive and active shields. The passive shield consists of 45 m rock overburden (140 meters water equivalent), 40 cm of low-activity concrete, and a lead and copper castle enclosed by an
-
An improved method of estimating the uncertainty of air-shower size at ultra-high energies Astropart. Phys. (IF 3.5) Pub Date : 2023-01-05 A. Coleman, P. Billoir, O. Deligny
The collection of a statistically significant number detected of cosmic rays with energy above 1017 to 1018 eV requires widely-spaced particle detectors at the ground level to detect the extensive air showers induced in the atmosphere. The air-shower sizes, proxies of the primary energies, are then estimated by fitting the observed signals to a functional form for expectations so as to interpolate
-
Hubble law and acceleration curve emerges in a repulsive matter-antimatter galaxies simulation Astropart. Phys. (IF 3.5) Pub Date : 2022-12-24 Christos Dimopoulos, Georgios L. Stamokostas, Leonardos Gkouvelis, Sergey Trigger
The consideration of dark energy is intended to explain the unexpected but observed acceleration of the universe. Baryon asymmetry in matter-antimatter initial annihilation is mostly accepted to explain the absence of observations of annihilation radiation that in turn leads to the most accepted hypothesis that we live in a matter-dominated universe. These are two of the greatest puzzles in modern
-
Evolution of magnetic fields in cosmic string wakes Astropart. Phys. (IF 3.5) Pub Date : 2022-12-14 Soumen Nayak, Sovan Sau, Soma Sanyal
We study the evolution of magnetic fields in cosmic string wakes in a plasma with a low resistivity. The initial magnetic field in the wake is modelled on the magnetic fields that are generated by the motion of particles around cosmic strings. The plasma is characterized by a high beta value. We find multiple shock like structures developing in the wake of the string. We study the detailed structure