The Skeleton: Connecting Large Scale Structures to Galaxy Formation (2009)
Pichon, Christophe, Gay, Christophe, Pogosyan, Dmitry, Prunet, Simon, Sousbie, Thierry, Colombi, Stephane, ...
We report on two quantitative, morphological estimators of the filamentary structure of the Cosmic Web, the so-called global and local skeletons. The first, based on a global study of the matter...
Cosmological Fluctuations from Infra-Red Cascading During Inflation (2009)
Barnaby, Neil, Huang, Zhiqi, Kofman, Lev, Pogosyan, Dmitry
We propose a qualitatively new mechanism for generating cosmological fluctuations from inflation. The non-equilibrium excitation of interacting scalar fields often evolves into infra-red (IR) and...
Tree structure of the percolating Universe (2000)
Colombi, Stephane, Pogosyan, Dmitry, Souradeep, Tarun
We present a numerical study of topological descriptors of initially Gaussian and scale-free density perturbations evolving via gravitational instability in an expanding universe. We carefully...
Fast CMB Analyses via Correlation Functions (2000)
Szapudi, Istvan, Prunet, Simon, Pogosyan, Dmitry, Szalay, Alexander S., Bond, J. Richard
We propose and implement a fast, universally applicable method for extracting the angular power spectrum C_l from CMB temperature maps by first estimating the correlation function \xi(\theta). Our...
CMB Anisotropy in Compact Hyperbolic Universes I: Computing Correlation Functions (1999)
Bond, J. Richard, Pogosyan, Dmitry, Souradeep, Tarun
CMB anisotropy measurements have brought the issue of global topology of the universe from the realm of theoretical possibility to within the grasp of observations. The global topology of the...
CMB Anisotropy in Compact Hyperbolic Universes II: COBE Maps and Limits (1999)
Bond, J. Richard, Pogosyan, Dmitry, Souradeep, Tarun
We calculate the CMB anisotropy in compact hyperbolic universe models using the regularized method of images described in paper-I, including the 'line-of-sight `integrated Sachs-Wolfe' effect, as...
Probing Cosmic topology using CMB anisotropy (1998)
Souradeep, Tarun, Pogosyan, Dmitry, Bond, J. Richard
The measurements of CMB anisotropy have opened up a window for probing the global topology of the universe on length scales comparable to and beyond the Hubble radius. We have developed a new method...
Constraints on Compact Hyperbolic Spaces from COBE (1997)
Bond, J. Richard, Pogosyan, Dmitry, Souradeep, Tarun
The (large angle) COBE DMR data can be used to probe the global topology of our universe on scales comparable to and just beyond the present ``horizon''. For compact topologies, the two main effects...