Past Pizza Lunches

Número de entradas: 152

04
Diciembre 2015

Chasing Dark Energy with the Dark Energy Survey : Status and Early Science Results


Inicio: 12:30h
Ponente: Martin Crocce
Lugar: ICE seminar room

The Dark Energy Survey (DES) is a next-generation large galaxy survey designed to unravel the nature of the dark energy that powers the current accelerated expansion of the Universe. The DES collaboration built a 570 mega-pixel optical and near-infrared camera, DECam, with a large 3 deg$^2$ field of…
Inicio: 12:30h
Ponente: Martin Crocce
Lugar: ICE seminar room

The Dark Energy Survey (DES) is a next-generation large galaxy survey designed to unravel the nature of the dark energy that powers the current accelerated expansion of the Universe. The DES collaboration built a 570 mega-pixel optical and near-infrared camera, DECam, with a large 3 deg$^2$ field of view. DECam is set at the prime focus of the Víctor M. Blanco 4-meter telescope in at the Cerro Tololo Inter-American Observatory in Chile. Using DECam, DES will map 5000 deg$^2$ to a depth $I_{AB}\sim24$ and observe designated supernova survey fields at high cadence. These data will allow DES to measure positions, approximate redshifts, and shapes for 300 million galaxies, the light-curves of several thousand supernovae, and the masses of tens of thousands of galaxy clusters. DES will then use four main probes to study the properties of dark energy: galaxy clustering on large scales, weak gravitational lensing, galaxy-cluster abundance, and supernova distances. I will describe the early progress of the survey with brief highlights of the science analyses that have been completed so far. These include: large-scale galaxy clustering measurements (that will be discussed in more depth); significant detection of a cross-correlation with SPT CMB lensing maps; wide mass maps from weak gravitational lensing; galaxy-shear and shear-shear correlation function measurements; the characterization of DES galaxy clusters and SNe1a light-curves, among other results. I will finish by presenting the current status and the plans for the upcoming years.
27
Noviembre 2015

A new family of compact objects? Dark Compact Planets


Inicio: 12:30h
Ponente: Laura Tolos
Lugar: Sala de Conferencies Alberto Lobo (Edifici nou)

A new family of compact objects formed by dark matter admixed with neutron star matter and white dwarf material is investigated. We consider non-self annihilating dark matter with an equation-of-state given by an interacting Fermi gas. We obtain new stable solutions, dark compact planets. For weakly…
Inicio: 12:30h
Ponente: Laura Tolos
Lugar: Sala de Conferencies Alberto Lobo (Edifici nou)

A new family of compact objects formed by dark matter admixed with neutron star matter
and white dwarf material is investigated. We consider non-self annihilating dark
matter with an equation-of-state given by an interacting Fermi gas. We obtain new stable
solutions, dark compact planets. For weakly interacting dark matter, the dark compact
planets have Earth-like masses and radii from few Km to few hundred Km, whereas they
have Jupiter-like masses and radii of few hundred Km for the strongly interacting dark
matter case. The dark compact planets could be formed primordially and accrete white
dwarf material afterwards. They could be observed as exoplanets with unusually small
radii. Furthermore, we find that the recently observed 2 Msun pulsars set limits on the
amount of dark matter inside neutron stars which is, at most, 10^−6Msun.  
Institute of Space Sciences (IEEC-CSIC)

Campus UAB, Carrer de Can Magrans, s/n
08193 Barcelona.
Phone: +34 93 737 9788
Email: ice@ice.csic.es
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya