130 citations · 658 across the 29 of their papers we have counts for
17 papers · 1 filter
Extreme-Value Statistics of the Spin of Primordial Black Holes
Siri Chongchitnan, Joseph Silk
How rare are extreme-spin primordial black holes? We show how, from an underlying distribution of PBH spin, extreme-value statistics can be used to quantify the rarity of spinning…
Extreme Primordial Black Holes
Siri Chongchitnan, Teeraparb Chantavat, Jenna Zunder
We present a formalism for calculating the probability distribution of the most massive primordial black holes (PBHs) expected within an observational volume. We show how current o…
Primordial Gravitational Waves and Reheating in a New Class of Plateau-like Inflationary Potentials
Siri Chongchitnan
We study a new class of inflation model parametrized by the Hubble radius, such that . These potentials are plateau-like, and reduce to the power-law potenti…
Inflationary e-folding and the implications for gravitational-wave detection
Siri Chongchitnan
We demonstrate that the approximation for the number of inflationary e-folds commonly used in the literature can lead to highly inaccurate predictions for the amplitude of primordi…
On the Abundance of Extreme Voids II: A Survey of Void Mass Functions
Siri Chongchitnan, Matthew Hunt
The abundance of cosmic voids can be described by an analogue of halo mass functions for galaxy clusters. In this work, we explore a number of void mass functions: from those based…
Inflation model building with an accurate measure of e-folding
Sirichai Chongchitnan
It has become standard practice to take the logarithmic growth of the scale factor as a measure of the amount of inflation, despite the well-known fact that this is only an approxi…
On the Abundance of Extreme Voids
Sirichai Chongchitnan
Cosmic voids have been shown to be an effective probe of cosmology, complementary to galaxy clusters. In this work, we present a simple theoretical framework for predicting of the…
The Effect of Cosmic Magnetic Fields on the Metagalactic Ionization Background inferred from the Lyman-α Forest
Sirichai Chongchitnan, Avery Meiksin
The sources which reionized the Intergalactic Medium by redshift ~6 are still unknown. A severe constraint on the ionization process is the low emissivity required to maintain the…
Constraining isocurvature perturbations with the 21cm emission from minihaloes
Yoshitaka Takeuchi, Sirichai Chongchitnan
We investigate the effects of isocurvature perturbations on the 21cm radiation from minihaloes (MHs) at high redshifts and examine constraints on the isocurvature amplitude and pow…
The 21cm Power Spectrum and the Shapes of Non-Gaussianity
Sirichai Chongchitnan
We consider how measurements of the 21cm radiation from the epoch of reionization (z=8-12) can constrain the amplitudes of various `shapes' of primordial non-Gaussianity. The limit…
The 21cm radiation from minihalos as a probe of small primordial non-Gaussianity
Sirichai Chongchitnan, Joseph Silk
We present a new probe of primordial non-Gaussianity via the 21cm radiation from minihalos at high redshifts. We calculate the fluctuations in the brightness temperature (measured…
A gauge-invariant approach to interactions in the dark sector
William J. Potter, Sirichai Chongchitnan
We outline a gauge-invariant framework to calculate cosmological perturbations in dark energy models consisting of a scalar field interacting with dark matter via energy and moment…
Primordial Non-Gaussianity and Extreme-Value Statistics of Galaxy Clusters
Sirichai Chongchitnan, Joseph Silk
What is the size of the most massive object one expects to find in a survey of a given volume? In this paper, we present a solution to this problem using Extreme-Value Statistics,…
COrE (Cosmic Origins Explorer) A White Paper
The COrE Collaboration, C. Armitage-Caplan, M. Avillez +72
COrE (Cosmic Origins Explorer) is a fourth-generation full-sky, microwave-band satellite recently proposed to ESA within Cosmic Vision 2015-2025. COrE will provide maps of the micr…
Scale-dependent Bias from the Reconstruction of Non-Gaussian Distributions
Sirichai Chongchitnan, Joseph Silk
Primordial non-Gaussianity introduces a scale-dependent variation in the clustering of density peaks corresponding to rare objects. This variation, parametrized by the bias, is inv…
A Study of High-Order Non-Gaussianity with Applications to Massive Clusters and Large Voids
Sirichai Chongchitnan, Joseph Silk
The statistical meaning of the local non-Gaussianity parameters f_NL and g_NL is examined in detail. Their relations to the skewness and the kurtosis of the probability distributio…
Imprints of dynamical dark energy on weak-lensing measurements
Sirichai Chongchitnan, Lindsay King
We show that simple models of scalar-field dark energy leave a generic enhancement in the weak-lensing power spectrum when compared to the LCDM prediction. In particular, we calcul…