16 papers
Is Dark Matter Really Matter?
Jun-Qian Jiang, Arman Shafieloo
In the standard model of cosmology, it is assumed that dark matter is pressureless with equation of state and dark energy has . We test these assumptions jointly using…
A refined method for measuring cosmological distances using variability and proper motions in AGN with VLBI-detected counter-jets
Jeffrey A. Hodgson, Anthony Carr, David Parkinson +6
In a previous paper, we described a `standard speed-gun' (SSG) distance that uses the speed of light to standardize a ruler under the assumption that the radio variability seen in…
Revisiting Metastable Dark Energy in Light of DESI DR2 BAO and DESI DR1 Full-Shape Measurements
Purba Mukherjee, Arman Shafieloo, Varun Sahni
We revisit metastable dark energy (DE) models described by a radioactive-like decay law. We consider three scenarios: an effective, exponentially decaying DE component; decay of DE…
Non-parametric estimation of the baryon gas fraction and the cosmological bias with clusters
Hyeon Kim, Raphaël Wicker, Benjamin L'Huillier +3
X-ray observations of galaxy clusters allow us to estimate the gas fraction, and thus the baryon fraction, and its evolution over time. This offers an additional cosmological probe…
A search for super-imposed oscillations to the primordial power spectrum in Planck and SPT-3G 2018 data
Akhil Antony, Fabio Finelli, Dhiraj Kumar Hazra +2
We search for super-imposed oscillations linearly or logarithmically spaced in Fourier wavenumbers in Planck and South Pole Telescope (SPT-3G) 2018 temperature and polarization…
A reassessment of LVE method and hemispherical power asymmetry in CMB temperature data from Planck PR4
Sanjeev Sanyal, Sanjeet K. Patel, Pavan K. Aluri +1
We undertake a reassessment of one of the large angular scale anomalies observed in cosmic microwave background (CMB) temperature signal referred to as Hemispherical Power Asymmetr…