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“From ages immemorial, the means universally used to mark off the passage of time has been the apparent motions of the celestial bodies; and the measurement of time whether by hours of day and night, ...
Co-evolution of Selection and Influence in Social Networks
Selection and Influence Social Networks
2011/9/14
Many networks are complex dynamical systems, where both attributes of nodes and topology of the network(link structure) can change with time. We propose a
model of co-evolving networks where both nod...
Big Science and the LHC
Big Science LHC
2011/9/1
The Large Hadron Collider (LHC) [1], the particle accelerator operating at the European laboratory CERN near Geneva, has already achieved remarkable results. On 30 March 2010 for the first time proton...
Lo Gnomone Clementino: Astronomia Meridiana in Chiesa dal '700 ad oggi
Lo Gnomone Clementino Astronomia Meridiana
2011/9/13
The Clementine Gnomon is a giant pinhole dark camera dedicated to meridian solar astrometry operating in the Basilica of Santa Maria degli Angeli in Rome. Pope Clement XI ordered Francesco Bianchini (...
A new Italian edition of the Letters of Gerbert,the astronomer, scientist and philosopher who become pope Silvester II, with their papal privileges has been
published in the occasion of the internati...
Incontri celesti, vita del padre Clavio in cinque atti
Incontri celest vita del padre Clavio
2011/9/1
2012 will be the fourth centennial year of the Jesuit Christopher Clavius (1535-1612), known as the Euclid of XVI century and the collaborator of the Pope Gregory XIII for the calendar reformation.In ...
Resolving Author Name Homonymy to Improve Resolution of Structures in Co-author Networks
Improve Resolution Co-author Networks
2011/9/13
We investigate how author name homonymy distorts clustered large-scale co-author networks, and present a simple, e ective, scal-able and generalizable algorithm to ameliorate such distortions. We eval...
A Brief Remark on Energy Conditions and the Geroch-Jang Theorem
Energy Conditions Geroch-Jang Theorem
2011/9/1
The status of the geodesic principle in General Relativity has been a topic of some interest in the recent literature on the foundations of spacetime theories. Part of this discussion has focused on t...
I offer one possible explanation of why inertial and gravitational mass are equal in Newtonian gravitation. I then argue that this is an example of a kind of explanation that is not captured by standa...
On the Status of the Geodesic Principle in Newtonian and Relativistic Physics
Newtonian and Relativistic Physics
2011/9/1
A theorem due to Bob Geroch and Pong Soo Jang [“Motion of a Body in General Relativity.”Journal of Mathematical Physics 16(1), (1975)] provides a sense in which the geodesic principle has the status o...
Ground-State Structures of Ice at High-Pressures
High-Pressures Ground-State Structures Ice
2011/9/13
Ab initio random structure searching based on density functional theory is used to determine the ground-state structures of ice at high pressures. Including estimates of lattice zero-point energies,ic...
The emergence of complex patterns in online human communication
complex patterns online human communication
2011/8/31
Social media have become essential conduits in the worldwide exchange of ideas, opinions and consumer marketing. Complex networks are important tools for analyzing the information ow in many aspects o...
Einstein's vierbein field theory of curved space
vierbein, general relativity, gravitational gauge theory, Dirac equation in curved space
2011/9/13
General Relativity theory is reviewed following the vierbein field theory approach proposed in 1928 by Einstein. It is based on the vierbein field taken as the “square root” of the metric tensor field...
Multiscale entanglement in ring polymers under spherical confinement
Multiscale entanglement ring polymers spherical confinement
2011/9/13
The interplay of geometrical and topological entanglement in semiflexible knotted polymer rings inside a spherical cavity is investigated using advanced numerical methods. By using stringent and robus...
When effective theories predict: the inevitability of Mercury's anomalous perihelion precession
Mercury’s Orbits in Newton’s Theory perturbations
2011/8/31
If the concepts underlying Effective Theory were appreciated from the earliest days of Newtonian gravity, Le Verrier’s announcement in 1845 of the
anomalous perihelion precession of Mercury would hav...