Brane Inflation and the Overshoot Problem (2009)
Bird, Simeon, Peiris, Hiranya V., Baumann, Daniel
We investigate recent claims that brane inflation solves the overshoot problem through a combination of microphysical restrictions on the phase space of initial conditions and the existence of the...
CMB polarization features from inflation versus reionization (2009)
Mortonson, Michael J., Dvorkin, Cora, Peiris, Hiranya V., Hu, Wayne
The angular power spectrum of the cosmic microwave background temperature anisotropy observed by WMAP has an anomalous dip at l~20 and bump at l~40. One explanation for this structure is the presence...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G, Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G., Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
Photometric constraints on white dwarfs and the identification of extreme objects (2008)
Mortlock, Daniel J., Peiris, Hiranya V., Ivezic, Zeljko
It is possible to reliably identify white dwarfs (WDs) without recourse to spectra, instead using photometric and astrometric measurements to distinguish them from Main Sequence stars and quasars....
Cosmological Inflation: Theory and Observations (2008)
Baumann, Daniel, Peiris, Hiranya V.
In this article we review the theory of cosmological inflation with a particular focus on the beautiful connection it provides between the physics of the very small and observations of the very...
Fine-tuning criteria for inflation and the search for primordial gravitational waves (2008)
Bird, Simeon, Peiris, Hiranya V., Easther, Richard
We revisit arguments that simple models of inflation with a small red tilt in the scalar power spectrum generically yield an observable tensor spectrum. We show that criteria for fine-tuning based...
Lack of initial conditions dependence of fluctuations in warm inflation (2008)
Berera, Arjun, Hall, Lisa M. H., Moss, Ian G., Peiris, Hiranya V.
Warm inflation dynamics is fundamentally based on a system-reservoir configuration in which the dynamics is dictated by a fluctuation-dissipation relation. Recent work by Cerioni et. al....
Primordial Black Holes, Eternal Inflation, and the Inflationary Parameter Space after WMAP5 (2008)
Peiris, Hiranya V., Easther, Richard
We consider constraints on inflation driven by a single, minimally coupled scalar field in the light of the WMAP5 dataset, as well as ACBAR and the SuperNova Legacy Survey. We use the Slow Roll...
Verde, Licia, Peiris, Hiranya V.
The latest cosmological data seem to indicate a significant deviation from scale invariance of the primordial power spectrum when parameterized either by a power law or by a spectral index with...
Testable polarization predictions for models of CMB isotropy anomalies (2007)
Dvorkin, Cora, Peiris, Hiranya V., Hu, Wayne
Anomalies in the large-scale CMB temperature sky measured by WMAP have been suggested as possible evidence for a violation of statistical isotropy on large scales. In any physical model for broken...
Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations (2007)
Bean, Rachel, Chen, Xingang, Peiris, Hiranya V., Xu, Jiajun
We compare the Infrared Dirac-Born-Infeld (IR DBI) brane inflation model to observations using a Bayesian analysis. The current data cannot distinguish it from the \LambdaCDM model, but is able to...
Cosmological Constraints on Dissipative Models of Inflation (2007)
Hall, Lisa M. H., Peiris, Hiranya V.
(Abridged) We study dissipative inflation in the regime where the dissipative term takes a specific form, \Gamma=\Gamma(\phi), analyzing two models in the weak and strong dissipative regimes with a...
Phenomenology of D-Brane Inflation with General Speed of Sound (2007)
Peiris, Hiranya V., Baumann, Daniel, Friedman, Brett, Cooray, Asantha
A characteristic of D-brane inflation is that fluctuations in the inflaton field can propagate at a speed significantly less than the speed of light. This yields observable effects that are distinct...
Huterer, Dragan, Peiris, Hiranya V.
We perform a comprehensive study of a class of dark energy models - scalar field models where the effective potential can be described by a polynomial series - exploring their dynamical behavior...
Smith, Tristan L., Peiris, Hiranya V., Cooray, Asantha
A detection of the primordial gravitational wave background is considered to be the "smoking-gun" evidence for inflation. While superhorizon waves are probed with cosmic microwave background (CMB)...
Smith, Tristan L., Peiris, Hiranya V., Cooray, Asantha
A detection of the primordial gravitational wave background is considered to be the ``smoking-gun '' evidence for inflation. While super-horizon waves are probed with cosmic microwave background...
Journal of Cosmology and Astroparticle Physics (2006)
An Iop, Sissa Journal, Hiranya V Peiris, Richard Easther
Recovering the inflationary potential and primordial power spectrum with a slow roll prior: methodology and application to WMAP three year data
Eccentric-disk models for the nucleus of M31 (2003)
Peiris, Hiranya V., Tremaine, Scott
We construct dynamical models of the ``double'' nucleus of M31 in which the nucleus consists of an eccentric disk of stars orbiting a central black hole. The principal approximation in these models...
Good Views of the Galaxy (2000)
Fitting Galactic structure models to star counts only provides useful information about the Galaxy in some directions. In this paper, we investigate the use of $\chi^2$ goodness-of-fit tests to...
Cross-correlating the Sloan Digital Sky Survey with the Microwave Sky (2000)
Peiris, Hiranya V., Spergel, David N.
While most of the microwave background fluctuations on angular scales greater than a few arcminutes were generated at z > 800, the low redshift universe does distort the microwave background. Since...