863 citations · 5.6k across the 74 of their papers we have counts for
8 papers · 1 filter
The Cold Spot as a Large Void: Rees-Sciama effect on CMB Power Spectrum and Bispectrum
Isabella Masina, Alessio Notari
The detection of a "Cold Spot" in the CMB sky could be explained by the presence of an anomalously large spherical underdense region (with radius of a few hundreds Mpc/h) located b…
Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae
Stephon Alexander, Tirthabir Biswas, Alessio Notari +1
It is now a known fact that if we happen to be living in the middle of a large underdense region, then we will observe an "apparent acceleration", even when any form of dark energy…
"Swiss-Cheese" Inhomogeneous Cosmology & the Dark Energy Problem
Tirthabir Biswas, Alessio Notari
We study an exact swiss-cheese model of the Universe, where inhomogeneous LTB patches are embedded in a flat FLRW background, in order to see how observations of distant sources ar…
Nonlinear Structure Formation and "Apparent" Acceleration: an Investigation
Tirthabir Biswas, Reza Mansouri, Alessio Notari
We present an analytically solvable nonlinear model of structure formation in a Universe with only dust. The model is an LTB solution (of General Relativity) and structures are she…
"Graceful" Old Inflation
Fabrizio Di Marco, Alessio Notari
We show that Inflation in a False Vacuum becomes viable in the presence of a spectator scalar field non minimally coupled to gravity. The field is unstable in this background, it g…
Late time failure of Friedmann equation
Alessio Notari
It is widely believed that the assumption of homogeneity is a good zero{\it th} order approximation for the expansion of our Universe. We analyze the correction due to subhorizon i…