Varying fundamental constants and dynamical dark energy

The behaviour of physical fundamental constants is an effective way to probe fundamental physics and cosmological models. The fine-structure constant α and the proton-to-electron mass ratio µ can be studied with a range of physical observables across the Universe, including  spectra of the more distant quasars, Cosmic Microwave Background and Primordial Nucleosynthesis. A connection between … Continua a leggere Varying fundamental constants and dynamical dark energy

Hot Topics in General Relativity and Gravitation

In this centennial anniversary of General Relativity, we will hold a conference on Hot Topics in General Relativity and Gravitation with the motivation to emphasize the tremendous progresses that have been made in Astrophysics and in Cosmology since Einstein’s discovery of General Relativity (GR) in 1915. This international conference will be held at ICISE as part … Continua a leggere Hot Topics in General Relativity and Gravitation

String Theory & Cosmology: New Ideas Meet New Experimental Data

This is the golden age of cosmology. Once a philosophical subject, cosmology has burgeoned into a precision science as ground and space-based astronomical observations supply a wealth of unprecedently precise cosmological measurements. Questions that were recently the stuff of speculation can now be analyzed in the context of rigorous, predictive theoretical frameworks whose viability is … Continua a leggere String Theory & Cosmology: New Ideas Meet New Experimental Data

Extended Theories of Gravity

The cosmological constant and the physics behind dark energy that accelerates the expansion of the universe remain among the biggest mysteries in theoretical physics. An intriguing possibility is that these problems stem from extrapolating Einstein’s General relativity from the Solar system to the far infrared cosmological scales. In the other extreme, at the ultraviolet regime … Continua a leggere Extended Theories of Gravity

Latest News from the Universe: LambdaWDM, CMB,Warm Dark Matter, Dark Energy, Neutrinos and Sterile Neutrinos

The new concordance model in agreement with observations: ΛWDM (Lambda-dark energy- Warm Dark Matter). Recently, Warm (keV scale) Dark Matter emerged impressively over CDM (Cold Dark Matter) as the leading Dark Matter candidate. Astronomical evidence that Cold Dark Matter (LambdaCDM) and its proposed tailored baryonic cures do not work at galactic and small scales is staggering. … Continua a leggere Latest News from the Universe: LambdaWDM, CMB,Warm Dark Matter, Dark Energy, Neutrinos and Sterile Neutrinos

Hunting for dark matter with HADES

Nonostante il 96% dell’Universo sia costituito principalmente da materia scura ed energia scura, non siamo ancora in grado di capire qual è la loro origine e natura. Alcuni astrofisici che ricercano le particelle come potenziali candidati della materia scura hanno escluso dalla lista il cosiddetto “fotone scuro” o “bosone U” grazie ad una serie di … Continua a leggere Hunting for dark matter with HADES

Neutrons method to test dark energy theories by sensitive measurements of gravity at small scales

Non sempre occorre un acceleratore di particelle per fare esperimenti di fisica fondamentale. I primi risultati di un esperimento a bassa energia sulla gravità newtoniana, spinto fino ad un limite più piccolo di cinque ordini di grandezza, stringono il cerchio sulle proprietà potenziali che forze e particelle potrebbero assumere al di là di questo limite … Continua a leggere Neutrons method to test dark energy theories by sensitive measurements of gravity at small scales

‘Mirage’ quintessence and phantom dark energy

Quintessenza e campi “fantasma” sono due tra le varie ipotesi formulate in seguito ai dati ottenuti dai satelliti, come WMAP e Planck, che tentano di spiegare la natura dell’enigmatica energia scura. Oggi, alcuni ricercatori di Barcellona e Atene suggeriscono che entrambe le possibilità sono una sorta di “miraggio” nelle osservazioni e potrebbe essere in definitiva … Continua a leggere ‘Mirage’ quintessence and phantom dark energy