Determination of z ∼ 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation
- E. Switzer, K. Masui, T. Voytek
- Physics
- 12 April 2013
The large-scale distribution of neutral hydrogen in the Universe will be luminous through its 21 cm emission. Here, for the first time, we use the auto-power spectrum of 21 cm intensity fluctuations…
MEASUREMENT OF 21 cm BRIGHTNESS FLUCTUATIONS AT z ∼ 0.8 IN CROSS-CORRELATION
- K. Masui, E. Switzer, T. Voytek
- Physics
- 1 August 2012
In this Letter, 21 cm intensity maps acquired at the Green Bank Telescope are cross-correlated with large-scale structure traced by galaxies in the WiggleZ Dark Energy Survey. The data span the…
REIONIZATION ON LARGE SCALES. III. PREDICTIONS FOR LOW-ℓ COSMIC MICROWAVE BACKGROUND POLARIZATION AND HIGH-ℓ KINETIC SUNYAEV–ZEL'DOVICH OBSERVABLES
- N. Battaglia, A. Natarajan, H. Trac, R. Cen, A. Loeb
- Physics
- 12 November 2012
We present new predictions for cosmic microwave background (CMB) temperature (on small angular scales) and polarization (on large angular scales) anisotropies induced during the epoch of reionization…
Effect of early dark matter halos on reionization
- A. Natarajan, D. Schwarz
- Physics
- 15 November 2008
The annihilation of dark matter particles releases energy, ionizing some of the gas in the Universe. We investigate the effect of dark matter halos on reionization. We show that the effect depends on…
PROBING THE DARK AGES AT z ∼ 20: THE SCI-HI 21 cm ALL-SKY SPECTRUM EXPERIMENT
- T. Voytek, A. Natarajan, J. M. Jáuregui García, J. Peterson, O. López-Cruz
- Physics
- 31 October 2013
We present first results from the SCI-HI experiment, which we used to measure the all-sky-averaged 21 cm brightness temperature in the redshift range 14.8 < z < 22.7. The instrument consists of a…
Bounds on dark matter properties from radio observations of Ursa Major II using the Green Bank Telescope
- A. Natarajan, J. Peterson, B. Willman
- Physics, Materials Science
- 22 August 2013
Radio observations of the Ursa Major II dwarf spheroidal galaxy obtained using the Green Bank Telescope are used to place bounds on weakly interacting massive particle (WIMP) dark matter properties.…
CONSTRAINING PRIMORDIAL MAGNETIC FIELDS THROUGH LARGE-SCALE STRUCTURE
- T. Kahniashvili, Y. Maravin, A. Natarajan, N. Battaglia, A. Tevzadze
- Physics
- 12 November 2012
We study primordial magnetic field effects on the matter perturbations in the universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e., during the…
Distinguishing standard reionization from dark matter models
- A. Natarajan, D. Schwarz
- Physics
- 23 February 2010
The Wilkinson Microwave Anisotropy Probe (WMAP) experiment has detected reionization at the 5:5 level and has reported a mean optical depth of 0:088 0:015. A powerful probe of reionization is the…
A closer look at CMB constraints on WIMP dark matter
- A. Natarajan
- Physics
- 18 January 2012
We use Cosmic Microwave Background data from the WMAP, SPT, BICEP, and QUaD experiments to obtain constraints on the dark matter particle mass m , and show that the combined data requires m > 7:6 GeV…
One-pot hydrothermal synthesis of nitrogen-doped reduced graphene oxide for the highly sensitive and simultaneous determination of dihydroxy benzene isomers
- Ezhilan Jayabal, A. Natarajan, V. Rengarajan
- Materials ScienceJournal of Applied Electrochemistry
- 20 April 2021
A simple, one-pot, and short-duration synthetic procedure utilizing two nitrogen sources has been demonstrated to prepare nitrogen-doped reduced graphene oxide (N-RGO). The N-RGO has been…
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