731 citations · 4.6k across the 76 of their papers we have counts for
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General form of effective operators from hidden sectors
Aqeel Ahmed, Zackaria Chacko, Ina Flood +2
We perform a model-independent analysis of the dimension-six terms that are generated in the low energy effective theory when a hidden sector that communicates with the Standard Mo…
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…
Composite Dark Matter and Neutrino Masses from a Light Hidden Sector
Aqeel Ahmed, Zackaria Chacko, Niral Desai +3
We study a class of models in which the particle that constitutes dark matter arises as a composite state of a strongly coupled hidden sector. The hidden sector interacts with the…
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…
Searching for a Fifth Force with Atomic and Nuclear Clocks
Dawid Brzeminski, Zackaria Chacko, Abhish Dev +2
We consider the general class of theories in which there is a new ultralight scalar field that mediates an equivalence principle violating, long-range force. In such a framework, t…
Improved cosmological constraints on the neutrino mass and lifetime
Guillermo F. Abellán, Zackaria Chacko, Abhish Dev +3
We present cosmological constraints on the sum of neutrino masses as a function of the neutrino lifetime, in a framework in which neutrinos decay into dark radiation after becoming…