4 papers
Phasing out Dark Matter Isocurvature with Thermal Misalignment
Brian Batell, Akshay Ghalsasi, Subhajit Ghosh +1
Thermal misalignment provides an alternative to the standard misalignment mechanism for the cosmological production of scalar dark matter. In this framework, feeble couplings to pa…
Directly Probing Neutrino Interactions through CMB Phase Shift Measurements
Gabriele Montefalcone, Subhajit Ghosh, Kimberly K. Boddy +2
Perturbations in the cosmic neutrino background produce a characteristic phase shift in the acoustic oscillations imprinted in the anisotropies of the cosmic microwave background (…
Early Universe Constraints on Variations in Fundamental Constants Induced by Ultralight Scalar Dark Matter
Subhajit Ghosh, Kimberly K. Boddy, Tien-Tien Yu
We study the cosmological impact of ultralight dark matter (ULDM) with a quadratic coupling to Standard Model particles. In addition to the suppression of small-scale power from UL…
Dark Matter-Radiation Scattering Enhances CMB Phase Shift through Dark Matter-loading
Subhajit Ghosh, Daven Wei Ren Ho, Yuhsin Tsai
A phase shift in the acoustic oscillations of CMB spectra is a characteristic signature for the presence of non-photon radiation propagating differently from photons, even when the…