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Publications Influence

The Cosmological Constant and Dark Energy

- P. Peebles, Bharat Ratra
- Physics
- 16 July 2002

Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda: nowadays the concept is termed dark energy or… Expand

3,241 52- PDF

Cosmological 'seed' magnetic field from inflation

- Bharat Ratra
- Physics
- 1 October 1991

We extend the canonical exponential potential scalar field inflation modified hot big bang model by adding an inflation epoch coupling, between the scalar field Φ responsible for inflation and an… Expand

412 18- PDF

Cosmology with a Time Variable Cosmological Constant

- P. Peebles, Bharat Ratra
- Physics
- 1 February 1988

Description d'une cosmologie basee sur une constante cosmologique Λ decroissante avec le temps quand l'energie potentielle du champ scalaire φ possede une queue en loi de puissance V∼φ − α pour φ… Expand

1,073 14

Median Statistics Estimate of the Distance to the Galactic Center

- Tia Camarillo, Varun Mathur, T. Mitchell, Bharat Ratra
- Physics
- 3 August 2017

We show that error distributions of a compilation of 28 recent independent measurements of the distance from the Sun to the Galactic center, $R_{0}$, are wider than a standard Gaussian and best fit… Expand

29 13- PDF

HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE COSMOLOGICAL DECELERATION-ACCELERATION TRANSITION REDSHIFT

- O. Farooq, Bharat Ratra
- Physics
- 22 January 2013

We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 ≤ z ≤ 2.3 and use this to place constraints on model parameters of constant and time-evolving dark… Expand

204 10- PDF

Cosmic Microwave Background Anisotropy in COBE DMR-normalized Open and Flat-Λ Cold Dark Matter Cosmogonies

- Bharat Ratra, N. Sugiyama, A. Banday, K. Górski
- Physics
- 20 May 1997

We compute the cosmic microwave background (CMB) anisotropy in open and flat-Λ cold dark matter (CDM) cosmogonies which are normalized to the two-year DMR sky maps. Presently available CMB data are… Expand

27 7

Median Statistics and the Hubble Constant

- G. Chen, Bharat Ratra
- Physics
- 26 May 2011

ABSTRACT.Following Gott et al., we use Huchra’s final compilation of 553 measurements of the Hubble constant (H0H0) to estimate median statistical constraints on H0H0. Our median statistical analysis… Expand

88 7- PDF

Median Statistics, H0, and the Accelerating Universe

- J. Gott, M. Vogeley, Silviu Podariu, Bharat Ratra
- Physics
- 7 June 2000

We develop median statistics that provide powerful alternatives to χ2 likelihood methods and require fewer assumptions about the data. Application to astronomical data demonstrates that median… Expand

151 5- PDF

Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature

- O. Farooq, F. Madiyar, Sara Crandall, Bharat Ratra
- Physics
- 12 July 2016

We compile an updated list of 38 measurements of the Hubble parameter $H(z)$ between redshifts $0.07 \leq z \leq 2.36$ and use them to place constraints on model parameters of constant and… Expand

168 5- PDF

Large-scale structure in COBE-normalized cold dark matter cosmogonies

- S. Cole, D. Weinberg, C. Frenk, Bharat Ratra
- Physics
- 10 February 1997

We study the clustering of the mass distribution in COBE-normalized open and flat CDM models using large N-body simulations. With an age of the universe of 14 Gyr (12 Gyr) for the flat (open) models… Expand

47 5- PDF

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