18 citations · 61 across the 7 of their papers we have counts for
8 papers
Non-Gaussian timing residual skewness in pulsar timing arrays
Reginald Christian Bernardo, Rituparna Mandal, Kin-Wang Ng
Motivated by searches for weak primordial non-Gaussianity in the cosmic microwave background, we investigate perturbative departures from Gaussian stochastic gravitational wave bac…
Simulating a Gaussian stochastic gravitational wave background signal in pulsar timing arrays
Reginald Christian Bernardo, Kin-Wang Ng
We revisit the theoretical modeling and simulation of a Gaussian stochastic gravitational wave background (SGWB) signal in a pulsar timing array (PTA). We show that the correlation…
Four-point correlation functions in axion inflation
Hing-Tong Cho, Kin-Wang Ng
We study parity violation in the early universe by examining the four-point correlation function within the axion inflation model. Using an open quantum system formalism from our p…
Charting the Nanohertz Gravitational Wave Sky with Pulsar Timing Arrays
Reginald Christian Bernardo, Kin-Wang Ng
In the summer of 2023, the pulsar timing arrays (PTAs) announced a compelling evidence for the existence of a nanohertz stochastic gravitational wave background (SGWB). Despite thi…
Accurate pulsar timing array residual variances and correlation of the stochastic gravitational wave background
Reginald Christian Bernardo, Kin-Wang Ng
Pulsar timing arrays have reported a compelling evidence of a nanohertz stochastic gravitational wave background. However, the origin of the signal remains undetermined, largely be…
Toward a test of Gaussianity of a gravitational wave background
Reginald Christian Bernardo, Stephen Appleby, Kin-Wang Ng
The degree of Gaussianity of a field offers insights into its cosmological nature, and its statistical properties serve as indicators of its Gaussianity. In this work, we examine t…
Correlations for an anisotropic polarized stochastic gravitational wave background in pulsar timing arrays
Reginald Christian Bernardo, Guo-Chin Liu, Kin-Wang Ng
The recent compelling observation of the nanohertz stochastic gravitational wave background has brought to light a new galactic arena to test gravity. In this paper, we derive a fo…
Beyond the Hellings-Downs curve: Non-Einsteinian gravitational waves in pulsar timing array correlations
Reginald Christian Bernardo, Kin-Wang Ng
The recent astronomical milestone by the pulsar timing arrays (PTA) has revealed galactic-size gravitational waves (GW) in the form of a stochastic gravitational wave background (S…