187 citations · 709 across the 23 of their papers we have counts for
17 papers · 1 filter
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…
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…
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.…
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…
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…
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…