187 citations · 709 across the 23 of their papers we have counts for
24 papers
Dark Matter-Dark Radiation Interactions and the Hubble Tension
Manuel A. Buen-Abad, Zackaria Chacko, Ina Flood +3
Models in which a subcomponent of dark matter interacts with dark radiation have been proposed as a solution to the Hubble tension. In this framework, the interacting subcomponent…
Stacking the Deck: Gambling on a Light QCD Axion
Abhishek Banerjee, Manuel A. Buen-Abad, Anson Hook
We consider axions lighter than what their QCD couplings might otherwise suggest. Starting with a -axion, we introduce a small explicit symmetry-breaki…
United States Muon Collider Community White Paper for the European Strategy for Particle Physics Update
A. Abdelhamid, D. Acosta, P. Affleck +301
This document is being submitted to the 2024-2026 European Strategy for Particle Physics Update (ESPPU) process on behalf of the US Muon Collider community, with its preparation co…
Atomic Dark Matter, Interacting Dark Radiation, and the Hubble Tension
Manuel A. Buen-Abad, Zackaria Chacko, Ina Flood +3
We present a new class of interacting dark sector models that can address the Hubble tension. Interacting dark radiation (DR) has previously been put forward as a solution to the p…
Dynamical Axion Misalignment from the Witten Effect
Abhishek Banerjee, Manuel A. Buen-Abad
We propose a relaxation mechanism for the initial misalignment angle of the pre-inflationary QCD axion with a large decay constant. The proposal addresses the challenges posed to t…
Light in the Shadows: Primordial Black Holes Making Dark Matter Shine
Kaustubh Agashe, Manuel Buen-Abad, Jae Hyeok Chang +4
We consider the possibility of indirect detection of dark sector processes by investigating a novel form of interaction between ambient dark matter (DM) and primordial black holes…
A Closer Look in the Mirror: Reflections on the Matter/Dark Matter Coincidence
Arushi Bodas, Manuel A. Buen-Abad, Anson Hook +1
We argue that the striking similarity between the cosmic abundances of baryons and dark matter, despite their very different astrophysical behavior, strongly motivates the scenario…
Probing New Physics with High-Redshift Quasars: Axions and Non-standard Cosmology
Chen Sun, Manuel A. Buen-Abad, JiJi Fan
The Hubble diagram of quasars, as candidates to ``standardizable" candles, has been used to measure the expansion history of the Universe at late times, up to very high redshifts (…
Stepped Partially Acoustic Dark Matter: Likelihood Analysis and Cosmological Tensions
Manuel A. Buen-Abad, Zackaria Chacko, Can Kilic +2
We generalize the recently proposed Stepped Partially Acoustic Dark Matter (SPartAcous) model by including additional massless degrees of freedom in the dark radiation sector. We f…
Gravitational-wave signatures from reheating
Manuel A. Buen-Abad, Jae Hyeok Chang, Anson Hook
We initiate a study of the gravitational-wave signatures of a phase transition that occurs as the Universe's temperature increases during reheating. The gravitational-wave signatur…
Stepped Partially Acoustic Dark Matter, Large Scale Structure, and the Hubble Tension
Manuel A. Buen-Abad, Zackaria Chacko, Can Kilic +2
We propose a new interacting dark sector model, Stepped Partially Acoustic Dark Matter (SPartAcous), that can simultaneously address the two most important tensions in current cosm…
Axion Echos from the Supernova Graveyard
Manuel A. Buen-Abad, JiJi Fan, Chen Sun
Stimulated decays of axion dark matter, triggered by a source in the sky, could produce a photon flux along the continuation of the line of sight, pointing backward to the source.…
Cosmological Constraints on Dark Matter Interactions with Ordinary Matter
Manuel A. Buen-Abad, Rouven Essig, David McKeen +1
Dark matter interactions with electrons or protons during the early Universe leave imprints on the cosmic microwave background and the matter power spectrum, and can be probed thro…
Challenges for an axion explanation of the muon measurement
Manuel A. Buen-Abad, JiJi Fan, Matthew Reece +1
The discrepancy between the muon measurement and the Standard Model prediction points to new physics around or below the weak scale. It is tantalizing to consider the loop ef…
Constraints on Axions from Cosmic Distance Measurements
Manuel A. Buen-Abad, JiJi Fan, Chen Sun
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurement…
Dark Matter Substructure under the Electron Scattering Lamppost
Jatan Buch, Manuel A. Buen-Abad, JiJi Fan +1
We study the mutual relationship between dark matter-electron scattering experiments and possible new dark matter substructure nearby hinted by the Gaia data. We show how kinematic…
Galactic Origin of Relativistic Bosons and XENON1T Excess
Jatan Buch, Manuel A. Buen-Abad, JiJi Fan +1
We entertain the exotic possibility that dark matter (DM) decays or annihilations taking place in our galaxy may produce a flux of relativistic very weakly-coupled bosons, axions o…
Common Origin of Warm Dark Matter and Dark Radiation
Manuel A. Buen-Abad, Raymond T. Co, Keisuke Harigaya
We consider a cosmological scenario where a relativistic particle and a stable massive particle are simultaneously produced from the decay of a late-decaying particle after Big-Ban…
Dynamical axion misalignment with small instantons
Manuel A. Buen-Abad, JiJi Fan
We present a new mechanism to relax the initial misalignment angle of the QCD axion and raise the cosmological bound on the axion decay constant. The QCD axion receives a contribut…
Cannibal Dark Matter and Large Scale Structure
Manuel A. Buen-Abad, Razieh Emami, Martin Schmaltz
Cannibals are dark matter particles with a scattering process that allows three particles to annihilate to two. This exothermic process keeps the gas of the remaining particles war…
Interacting Dark Sector and Precision Cosmology
Manuel A. Buen-Abad, Martin Schmaltz, Julien Lesgourgues +1
We consider a recently proposed model in which dark matter interacts with a thermal background of dark radiation. Dark radiation consists of relativistic degrees of freedom which a…
A model for the LHC diboson excess
Manuel Buen-Abad, Andrew G. Cohen, Martin Schmaltz
The first run of the LHC showed hints of a new resonance with mass near TeV decaying into electroweak gauge boson pairs as well as into dijets. While Run 2 has neither confir…
Non-Abelian dark matter and dark radiation
Manuel A. Buen-Abad, Gustavo Marques-Tavares, Martin Schmaltz
We propose a new class of dark matter models with unusual phenomenology. What is ordinary about our models is that dark matter particles are WIMPs, they are weakly coupled to the S…
Non-diagonal charged lepton mass matrix and non-zero
J. Alberto Acosta, Alfredo Aranda, Manuel A. Buen-Abad +1
Assuming that the neutrino mass matrix is diagonalized by the tribimaximal mixing matrix, we explore the textures for the charged lepton mass matrix that render an lepto…