Article
Astronomy & Astrophysics
Bastian Diaz Saez, Karim Ghorbani
Summary: We explore a class of simplified extensions to the Standard Model, which includes a complex singlet scalar and a vector-like lepton as a mediator, both charged under a new Z3 symmetry. The model, in its simplest form, couples only to right-handed electrons and can accommodate the correct dark matter relic abundance while evading strong constraints from perturbativity, collider, and dark matter searches. Additionally, the model can naturally enhance positron fluxes by several orders of magnitude, leading to a box-shaped spectra. The quantum charge assignments of the new fields offer various phenomenological possibilities.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Andrea Caputo, Michela Negro, Marco Regis, Marco Taoso
Summary: We study the potential of the NASA MeV mission COSI (Compton Spectrometer and Imager) in the search for dark matter. Our results show that COSI offers a great opportunity to directly detect dark matter in the form of monochromatic gamma-rays from decays or annihilations. We also demonstrate that COSI can contribute to the search for primordial black holes (PBHs) dark matter and improve current bounds on sub-GeV dark matter annihilation/decay and PBH evaporation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Adam Coogan, Logan Morrison, Stefano Profumo
Summary: This work analyzes the dark matter self-annihilation cross sections into final states containing mesons and the Standard Model dynamical degrees of freedom, and explores the discovery reach of future gamma-ray telescopes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Adam Coogan, Logan Morrison, Tilman Plehn, Stefano Profumo, Peter Reimitz
Summary: We present a new open-source package, Hazma 2, for computing accurate spectra relevant for indirect dark matter searches. The package calculates photon, neutrino, and positron production, provides example results and observational constraints, and compares with other existing codes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jaume Zuriaga-Puig, Viviana Gammaldi, Daniele Gaggero, Thomas Lacroix, M. A. Sanchez-Conde
Summary: This paper presents a comprehensive study of the gamma-ray flux observed in the Galactic Center using the H.E.S.S. telescope. The aim of the study is to constrain the distribution of dark matter in the region and investigate the possibility of a density enhancement near the supermassive black hole Sgr A*. The results support the hypothesis of an enhanced dark matter density in the Galactic Center and provide guidance for future studies using current and next-generation telescopes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Sulagna Bhattacharya, Basudeb Dasgupta, Ranjan Laha, Anupam Ray
Summary: This study shows that the nondetection of gravitational waves from low-mass black hole mergers can place constraints on the interactions between nonannihilating dark matter particles and nucleons. With LIGO data, benchmark constraints for different types of dark matter have been determined, which will help detect particle dark matter and test its ability to explain the absence of pulsars in the Galactic center.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Rakhi Mahbubani, Michele Redi, Andrea Tesi
Summary: The study investigates dark matter bound-state formation and its implications for indirect detection experiments, providing generic formulas for the formation of shallow nuclear bound states on emission of photons, W and Z gauge bosons. It finds that the short-distance nuclear potential often violates factorization, and the bound-state formation of a (weakly-coupled) Minimal DM quintuplet gives rise to indirect-detection signals compatible with current bounds.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Jack Runburg, Eric J. Baxter, Jason Kumar
Summary: In the cold dark matter scenario, the gamma-ray probability distribution function (PDF) can provide information about the velocity dependence of the dark matter annihilation. Current and future observations can be used to constrain the microphysics of dark matter annihilation by performing mock data analysis. Additionally, a four-parameter degeneracy between the velocity dependence, minimum subhalo mass, power law index of the subhalo mass function, and normalization of the dark matter signal is pointed out, which can be resolved with priors from N-body simulations or observational constraints.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Javier Reynoso-Cordova, Oleg Burgueno, Alex Geringer-Sameth, Alma X. Gonzalez-Morales, Stefano Profumo, O. Valenzuela
Summary: The observed gamma-ray emission associated with omega-Centauri can be explained by two possible scenarios: emission from millisecond pulsars (MSP) and dark matter (DM) annihilation. By studying the total number of MSPs in the globular cluster and constraining the DM particle mass, upper limits on omega-Centauri's dark matter content were translated into lower limits on the annihilation cross section, taking into account the spatial extension of the DM halo. Further analysis of omega-Centauri's internal kinematics and the resident MSP population will provide stronger constraints and shed light on the mysterious origin of the gamma-ray source.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Arman Esmaili, P. D. Serpico
Summary: By analyzing the Tibet AS(gamma) data in the sub-PeV energy region, important implications for decaying dark matter candidates can be derived. The results suggest that significantly better sensitivity can be achieved by using the arrival distribution of photons than by existing methods.
Article
Astronomy & Astrophysics
Thomas Lacroix, Gaetan Facchinetti, Judit Perez-Romero, Martin Stref, Julien Lavalle, David Maurin, Miguel A. Sanchez-Conde
Summary: This study presents the first systematic exploration of velocity-dependent dark matter annihilation in various astrophysical objects, highlighting the significant impact of velocity dependence on dark matter halo substructure and signal angular extension.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Debajit Bose, Tarak Nath Maity, Tirtha Sankar Ray
Summary: By measuring the solar gamma ray flux, we have set stronger limits on the scattering cross section between dark matter and electrons, with these limits ranging from GeV to PeV scale for dark matter masses, which are four to six orders of magnitude stronger than existing limits.
Article
Astronomy & Astrophysics
S. Arcari, E. Pinetti, N. Fornengo
Summary: This paper introduces a method of using the cross-correlation technique to search for dark matter signals by observing information in cosmic voids. It is found that the signal-to-background ratio for decaying dark matter versus astrophysical sources is significantly higher in voids compared to halos, making it easier to detect pure dark matter signals.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Antonio Ambrosone, Marco Chianese, Damiano F. G. Fiorillo, Antonio Marinelli, Gennaro Miele
Summary: Starburst galaxies are potential sources of high-energy gamma rays, and their cosmic-ray spectrum distortion can be indirectly observed. Current data provide tight bounds on the cross section between protons and dark matter, while future measurements are expected to significantly improve these limits.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Pooja Bhattacharjee, Debajyoti Choudhury, Kasinath Das, Dilip Kumar Ghosh, Pratik Majumdar
Summary: This paper examines 14 recently discovered ultra-faint dwarf galaxies (UFDs) and studies the electromagnetic radiation emitted from them across a wide range of frequencies. Upper limits on annihilation cross section in a model independent way are obtained through analysis of Fermi-LAT data on high energy gamma rays and radio fluxes at the GMRT and VLA. The sensitivity of the Square Kilometer Array radio telescope in probing synchrotron radiation from the UFDs is discussed, as well as the dependence of the upper limits on uncertainties in determining various astrophysical parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Review
Physics, Multidisciplinary
T. Aramaki, S. Boggs, S. Bufalino, L. Dal, P. von Doetinchem, F. Donato, N. Fornengo, H. Fuke, M. Grefe, C. Hailey, B. Hamilton, A. Ibarra, J. Mitchell, I. Mognet, R. A. Ong, R. Pereira, K. Perez, A. Putze, A. Raklev, P. Salati, M. Sasaki, G. Tarle, A. Urbano, A. Vittino, S. Wild, W. Xue, K. Yoshimura
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2016)
Review
Physics, Multidisciplinary
Sergey Alekhin, Wolfgang Altmannshofer, Takehiko Asaka, Brian Batell, Fedor Bezrukov, Kyrylo Bondarenko, Alexey Boyarsky, Ki-Young Choi, Cristobal Corral, Nathaniel Craig, David Curtin, Sacha Davidson, Andre de Gouvea, Stefano Dell'Oro, Patrick deNiverville, P. S. Bhupal Dev, Herbi Dreiner, Marco Drewes, Shintaro Eijima, Rouven Essig, Anthony Fradette, Bjoern Garbrecht, Belen Gavela, Gian F. Giudice, Mark D. Goodsell, Dmitry Gorbunov, Stefania Gori, Christophe Grojean, Alberto Guffanti, Thomas Hambye, Steen H. Hansen, Juan Carlos Helo, Pilar Hernandez, Alejandro Ibarra, Artem Ivashko, Eder Izaguirre, Joerg Jaeckel, Yu Seon Jeong, Felix Kahlhoefer, Yonatan Kahn, Andrey Katz, Choong Sun Kim, Sergey Kovalenko, Gordan Krnjaic, Valery E. Lyubovitskij, Simone Marcocci, Matthew Mccullough, David McKeen, Guenakh Mitselmakher, Sven-Olaf Moch, Rabindra N. Mohapatra, David E. Morrissey, Maksym Ovchynnikov, Emmanuel Paschos, Apostolos Pilaftsis, Maxim Pospelov, Mary Hall Reno, Andreas Ringwald, Adam Ritz, Leszek Roszkowski, Valery Rubakov, Oleg Ruchayskiy, Ingo Schienbein, Daniel Schmeier, Kai Schmidt-Hoberg, Pedro Schwaller, Goran Senjanovic, Osamu Seto, Mikhail Shaposhnikov, Lesya Shchutska, Jessie Shelton, Robert Shrock, Brian Shuve, Michael Spannowsky, Andy Spray, Florian Staub, Daniel Stolarski, Matt Strassler, Vladimir Tello, Francesco Tramontano, Anurag Tripathi, Sean Tulin, Francesco Vissani, Martin W. Winkler, Kathryn M. Zurek
REPORTS ON PROGRESS IN PHYSICS
(2016)
Article
Astronomy & Astrophysics
Riccardo Catena, Alejandro Ibarra, Andreas Rappelt, Sebastian Wild
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Johannes Herms, Alejandro Ibarra, Takashi Toma
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Alejandro Ibarra, Bradley J. Kavanagh, Andreas Rappelt
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Matteo Agostini, Elisabetta Bossio, Alejandro Ibarra, Xabier Marcano
Summary: This paper discusses using double-beta decay experiments to probe models with light exotic fermions by searching for spectral distortions in the electron spectrum. They consider models with light sterile neutrinos singly produced in double-beta decay, and models with light Z(2)-odd fermion pair produced due to a Z(2) symmetry. They estimate the discovery potential of a selection of double-beta decay experiments and find that future searches will test a new part of the parameter space at the MeV-mass scale.
Article
Astronomy & Astrophysics
Gonzalo Herrera, Alejandro Ibarra
Summary: This study investigates the impact of non-galactic dark matter on direct detection experiments by calculating the effect of dark matter flux from the Local Group and the Virgo Supercluster on nuclear and electron recoil experiments. The results show that the increase in dark matter flux can significantly enhance the signal rate.
Article
Astronomy & Astrophysics
Alejandro Ibarra, Marcela Marin, Pablo Roig
Summary: We analyze the flavor violating muon decay mu -> e chi, where chi is a massive gauge boson, with emphasis on the regime where chi is ultralight. We study this process from an effective field theory standpoint using form factors and present two explicit models that generate mu -> e chi at tree level and at the one-loop level. We also discuss the prospects of observing the mu -> e chi process in light of the current limits on mu -> 3e from the SINDRUM collaboration.
Article
Astronomy & Astrophysics
Miguel Escudero, Alejandro Ibarra, Victor Maura
Summary: The EMPRESS survey, using a new sample of extremely metal poor systems, has reported a primordial helium abundance that is 3s smaller than the prediction from standard big bang nucleosynthesis. This could indicate a primordial lepton asymmetry in the electron neutrino flavor. A comprehensive analysis of the lepton asymmetry is presented, using measurements of primordial element abundances and cosmic microwave background (CMB) data from Planck. The results suggest a non-zero lepton asymmetry with a deviation from zero of 2.9s, assuming no dark radiation, or 2.2s if the abundance of dark radiation is not assumed.
Review
Physics, Multidisciplinary
Alejandro Ibarra
Summary: Neutrino oscillation experiments have provided evidence of nonzero neutrino masses. The explanation for the smallness of neutrino masses involves adding heavy right-handed neutrinos with a Majorana mass term to the particle spectrum of the Standard Model. The out-of-equilibrium decay of these heavy neutrinos during the early stages of the Universe could potentially explain the observed matter-antimatter asymmetry.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Laura SerkSnyte, Stephan Koenigstorfer, Philip von Doetinchem, Laura Fabbietti, Diego Mauricio Gomez-Coral, Johannes Herms, Alejandro Ibarra, Thomas Poeschl, Anirvan Shukla, Andrew Strong, Ivan Vorobyev
Summary: This study presents the most up-to-date calculation of antideuteron fluxes from cosmic-ray collisions with the interstellar medium and from exotic processes. The recently measured inelastic interaction cross section is included to account for the loss of antideuterons during propagation.
Article
Astronomy & Astrophysics
Cesar Bonilla, Johannes Herms, Alejandro Ibarra, Patrick Strobl
Summary: The impact of two-loop effects on the right-handed neutrino masses is explored in this paper, especially when the right-handed neutrino mass spectrum is highly hierarchical at the cutoff scale. It is found that extensions of the Planck-scale lepton number breaking scenario by additional Higgs doublets can lead to an overall neutrino mass scale and hierarchy that qualitatively align with observations.
Article
Astronomy & Astrophysics
Alejandro Ibarra, Patrick Strobl, Takashi Toma
Proceedings Paper
Physics, Multidisciplinary
Alejandro Ibarra
52ND WINTER SCHOOL OF THEORETICAL PHYSICS: THEORETICAL ASPECTS OF NEUTRINO PHYSICS
(2016)
Proceedings Paper
Astronomy & Astrophysics
Sebastian Wild, Francesc Ferrer, Alejandro Ibarra
XIV INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2015), PTS 1-7
(2016)