Is there Correlation between Fine Structure and Dark Energy Cosmic Dipoles
- A. Mariano, L. Perivolaropoulos
- Physics
- 18 June 2012
We present a detailed analysis (including redshift tomography) of the cosmic dipoles in the Keck+VLT quasar absorber and in the Union2 SnIa samples. We show that the fine structure constant cosmic…
Searching for a Cosmological Preferred Axis: Union2 Data Analysis and Comparison with Other Probes
- I. Antoniou, L. Perivolaropoulos
- Physics
- 25 July 2010
We review, compare and extend recent studies searching for evidence for a preferred cosmological axis. We start from the Union2 SnIa dataset and use the hemisphere comparison method to search for a…
COBE versus cosmic strings. An analytical model
- L. Perivolaropoulos
- Physics
- 25 August 1992
Crossing the phantom divide: theoretical implications and observational status
- S. Nesseris, L. Perivolaropoulos
- Physics
- 4 October 2006
If the dark energy equation of state parameter w(z) crosses the phantom divide line w = −1 (or equivalently if the expression d(H2(z))/dz−3Ω0mH02(1+z)2 changes sign) at recent redshifts, then there…
Large Scale Cosmological Anomalies and Inhomogeneous Dark Energy
- L. Perivolaropoulos
- Physics
- 17 January 2014
A wide range of large scale observations hint towards possible modifications on the standard cosmological model which is based on a homogeneous and isotropic universe with a small cosmological…
Tension and constraints on modified gravity parametrizations of $G_{\textrm{eff}}(z)$ from growth rate and Planck data
- S. Nesseris, G. Pantazis, L. Perivolaropoulos
- Physics
- 30 March 2017
We construct an updated and extended compilation of growth-rate data based on recent redshift-space distortion measurements. The data set consists of 34 data points and includes corrections for model…
PPN Parameter $\gamma$ and Solar System Constraints of Massive Brans-Dicke Theories
- L. Perivolaropoulos
- Geology
- 17 November 2009
Previous solar system constraints of the Brans-Dicke (BD) parameter $\ensuremath{\omega}$ have either ignored the effects of the scalar field potential (mass terms) or assumed a highly massive scalar…
A Comparison of cosmological models using recent supernova data
- S. Nesseris, L. Perivolaropoulos
- Materials Science
- 26 January 2004
We study the expansion history of the universe up to a redshift of $\mathrm{z}=1.75$ using the 194 recently published SnIa data by Tonry et al. and Barris et al. In particular we find the best fit…
CMB maximum temperature asymmetry axis: Alignment with other cosmic asymmetries
- A. Mariano, L. Perivolaropoulos
- Physics
- 26 November 2012
We use a global pixel based estimator to identify the axis of the residual Maximum Temperature Asymmetry (MTA) (after the dipole subtraction) of the WMAP 7 year Internal Linear Combination (ILC) CMB…
Submillimeter spatial oscillations of Newton’s constant: Theoretical models and laboratory tests
- L. Perivolaropoulos
- Physics
- 22 November 2016
We investigate the viability of sub-millimeter wavelength oscillating deviations from the Newtonian potential at both the theoretical and the experimental/observational level. At the theoretical…
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