313 citations · 2.7k across the 67 of their papers we have counts for
67 papers
Higgsino Above the Sea of Fog
JiJi Fan, Matthew Reece
Higgsino dark matter is a classic, but still viable, weakly-interacting massive particle (WIMP) scenario that could point to supersymmetry, a new spacetime symmetry of nature. It i…
CMB Constraints on Pre-Inflationary Axion Dark Matter Isocurvature
Catherine Petretti, Praniti Singh, Matteo Braglia +3
Although measurements of the Cosmic Microwave Background (CMB) are consistent with a nearly scale-invariant primordial spectrum of adiabatic perturbations, in which the energy dens…
Axion Perturbations: A General Analytical Treatment
Itamar J. Allali, Priyesh Chakraborty, JiJi Fan +1
Cosmological data provides us two key constraints on dark matter (DM): it must have a particular abundance, and it must have an adiabatic spectrum of density perturbations in the e…
Phenomenology of Spillway Preheating: Equation of State and Gravitational Waves
Gareth Mansfield, JiJi Fan, Qianshu Lu
In the canonical tachyonic resonance preheating scenario, only an order one fraction of energy density in the inflaton is transferred to radiation, due to backreaction effects. One…
Constraints on photon mass and dark photon from the Jovian magnetic field
Shi Yan, Lingfeng Li, JiJi Fan
The Jovian magnetic field, being the strongest and largest planetary one in the solar system, could offer us new insights into possible microscopic scale new physics, such as a non…
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 (…