Extracting 21 cm signal by frequency and angular filtering

The multi - frequency angular power spectrum of the epoch of reionization 21 cm signal

Observations of redshifted 21cm radiation from neutral hydrogen (HI) at high redshifts is an important future probe of reionization. We consider the Multi-frequency Angular Power Spectrum (MAPS) to quantify the statistics of the HI signal as a joint function of the angular multipole l and frequency separation ∆ν. The signal at two different frequencies is expected to get decorrelated as ∆ν is i...

Global 21 cm signal experiments : A designer ’ s guide

COSMIC REIONIZATION AND THE 21 cm SIGNAL: COMPARISON BETWEEN AN ANALYTICAL MODEL AND A SIMULATION

We measure several properties of the reionization process and the corresponding low-frequency 21 cm signal associated with the neutral hydrogen distribution, using a large volume, high-resolution simulation of cosmic reionization. The brightness temperature of the 21 cm signal is derived by postprocessing this numerical simulationwith a semianalytical prescription. Our study extends to high red...

Quantum Money and Scalable 21-cm Cosmology

This thesis covers two unrelated topics. The first part of my thesis is about quantum money, a cryptographic protocol in which a mint can generate a quantum state that no one can copy. In public-key quantum money, anyone can verify that a given quantum state came from the mint, and in collision-free quantum money, even the mint cannot generate two valid quantum bills with the same serial number...

Extracting low frequency climate signal from GRACE data

For more than four years, the GRACE pair of satellites have been orbiting the Earth, monitoring the time variable mass distribution for scales ranging from regional to global. The GRACE data have been released for a broad scientific community and sets of gravity fields are available. This paper shows that there are evidences at interrannual time scales for the presence of ENSO signal in the dat...