A5072584794- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Advanced X-ray and CT Imaging
- Advanced X-ray Imaging Techniques
- Stellar, planetary, and galactic studies
- Inertial Sensor and Navigation
University of Cambridge
2023-2025
National Institute for Astrophysics
2008-2010
Consorzio Roma Ricerche
2005
National Research Council
2005
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
1982-2001
IFOM
2001
Ansaldo (Italy)
2000
Azienda Trasporti Milanesi (Italy)
1973-1987
Istituto di Astrofisica Spaziale e Fisica cosmica di Palermo
1984
University of Southampton
1981
The European Photon Imaging Camera (EPIC) consortium has provided the focal plane instruments for three X-ray mirror systems on XMM-Newton. Two cameras with a reflecting grating spectrometer in optical path are equipped MOS type CCDs as detectors (Turner [CITE]), telescope full photon flux operates novel pn-CCD an imaging spectrometer. camera system was developed under leadership of Max-Planck-Institut für extraterrestrische Physik (MPE), Garching. concept is described well different...
The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by three mirrors. There is one camera at focus each mirror; two cameras contain seven MOS CCDs, while third uses twelve PN defining a circular field view 30′ diameter in case. were specially developed for EPIC, combine high quality with spectral resolution close Fano limit. A filter wheel carrying kinds transparent light blocking filter, fully closed, open...
Abstract The Cosmic Gravitational Wave Background (CGWB) is an irreducible background of gravitational waves generated by particle exchange in the early Universe plasma. Standard Model particles contribute to such a stochastic with peak at f ∼80 GHz. Any physics beyond (BSM) may modify CGWB spectrum, making it potential testing ground for BSM physics. We consider impact general scenarios on CGWB, including arbitrary number hidden sectors. find that largest amplitude comes from sector...
A bstract We revisit the study of string theory close to Hagedorn temperature with aim towards cosmological applications. consider interactions open and closed strings in a gas D p -branes, and/or one isolated -brane, an arbitrary number d flat non-compact dimensions general compact dimensions. Leading order perturbation is used obtain basic interaction rates background, which are shown be consistent random walk picture highly excited that should apply more backgrounds. Using interpretation...
A bstract We study finite temperature effects in string cosmology and their potential gravitational wave signature. Expanding on our recent work [1], we consider a general configuration of highly excited open closed strings at high enough to be the Hagedorn phase 3+1 dimensions, order explore its cosmological implications. find conditions, which can satisfied compactifications with moduli stabilization, that allow long remain equilibrium controlled effective field theory, equilibration...
We provide an accessible review to the eta problem in brane-antibrane inflation and a recently proposed solution. The description of antibrane by means nonlinearly realized supersymmetry suggests simple stabilization mechanism for volume mode, based on most general Kahler superpotentials compatible with symmetries problem. This work is contribution proceedings second meeting COST Action CA21106 (Cosmic WISPers) arXiv:2410.00097 .
We provide an accessible review to the eta problem in brane-antibrane inflation and a recently proposed solution. The description of antibrane by means nonlinearly realized supersymmetry suggests simple stabilization mechanism for volume mode, based on most general Kahler superpotentials compatible with symmetries problem. This work is contribution proceedings second meeting COST Action CA21106 (Cosmic WISPers) arXiv:2410.00097 .
Abstract We study a new framework for brane–antibrane inflation where moduli stabilisation relies purely on perturbative corrections to the effective action. This guarantees that model does not suffer from eta-problem. The inflationary potential has two contributions: tension of an antibrane at tip warped throat, and its Coulomb interaction with mobile brane. represents first realisation original idea inflation, as opposed inflection point which arises when are fixed non-perturbative...
Abstract Cosmic (super)strings offer promising ways to test ideas about the early universe and physics at high energies. While in field theory constructions their tension is usually assumed be constant (or most slowly-varying), this often not case context of String Theory. Indeed, tensions both fundamental strings within a string compactification depend on expectation values moduli, which turn can vary with time. We discuss how evolution cosmic network changes time-dependent tension, for...
In this talk, we explore the effect of new Physics in shape Cosmic Gravitational Wave Background (CGWB): a stochastic background Waves (GWs) sourced by primordial plasma. We argue that CGWB is direct probe for physics at energies much higher than those last scattering surface, which bounds electromagnetic astronomy. Due to its characteristic frequency, around $80$ GHz, an example ultra high frequency source GWs, are attracting attention growing community both theorists and...
The Ariel V Sky Survey Instrument is described and preliminary results given from an extended observation of the Milky Way in 1974 November. A substantial number new, mostly faint, sources are found, due mainly to higher mean sensitivity this survey compared with that reported 3U catalogue. Source confusion these single-scan data restricts unambiguous new 16 at stage. location intensity listed details also 17 MX which have shown a marked reduction X-ray since 1971–72.
We present the XMM-Newton first light image, taken in January 2000 with EPIC pn camera during instrument's commissioning phase, when was pointing towards Large Magellanic Cloud (LMC). The field is rich different kinds of X-ray sources: point sources, supernova remnants (SNRs) and diffuse emission from LMC interstellar gas. observations are unprecedented sensitivity, reaching a few 10 erg/s for sources LMC. describe how these data sets were analysed discuss some spectroscopic results. For SNR...
This paper presents the XMM-Newton first-light observations of Hickson-16 compact group galaxies. Groups are possibly oldest large-scale structures in Universe, pre-dating clusters galaxies, and highly evolved. small at a redshift 0.0132 (or 80 Mpc) is exceptional having highest concentration starburst or AGN activity nearby Universe. So it veritable laboratory for study relationship between galaxy interactions nuclear activity. Previous optical emission line studies indicated strong...
We study a new framework for brane-antibrane inflation where moduli stabilisation relies purely on perturbative corrections to the effective action. This guarantees that model does not suffer from eta-problem. The inflationary potential has two contributions: tension of an antibrane at tip warped throat, and its Coulomb interaction with mobile brane. represents first realisation original idea inflation, as opposed inflection point which arises when are fixed non-perturbative effects....
view Abstract Citations (46) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Low-energy gamma-ray emission close to CG 135+1. Perotti, F. ; della Ventura, A. Villa, G. Di Cocco, Butler, R. C. Dean, J. Hayles, I. A region of the sky COS B source 135 + 1 was studied over photon energy range 20 keV-25 MeV from balloon altitudes on 1978 October 8. five-standard-deviation excess measured in counting rate telescope above 120 keV, and spectrum...
EPIC, the European Photon Imaging Cameras is an experiment based on cooled CCDs board ESA X-ray Multi Mirrors satellite due to be launched in 1999. Since CCD's are sensitive radiation other than X-rays, namely Optical and UV light, filters necessary prevent this from reaching detector area. Three types of were developed, used alternatively depending target source. Here we report medium thin developed by MOXTEK Inc. Orem, Utah, while thick ones, at Max-Planck-Institut fur Extraterrestrische...