Seminars
 
CSIC
11/02/2020 - 00/00/0000
NoiseChisel and Gnuastro: non-parametric detection and analysis of astronomical targets
Sala Alberto Lobo (ICE building, UAB Campus)
Astronomical instrumentation has greatly advanced over the last 40 years: with digital detectors, space telescopes and +8m class ground-based telescopes for example. However, the signal-based detection paradigm (for example from Petrosian or Kron in the 1970s, mostly used as implemented in SExtractor from the mid-1990s) is still the dominant method of low-level data analysis: detection, segmentation and measurements or catalog production.
CSIC
07/02/2020 - 00/00/0000
The size of the universe
Sala Alberto Lobo (ICE building, UAB Campus)
Cosmic acceleration is telling us that Newton's gravitational law is different from the one we learn in school. I will show how this could imply that our universe is smaller than what we thought. This explains why vacuum energy does not gravitate and can also explain cosmic acceleration without the need dark energy or modified gravity.
UB
06/02/2020 - 00/00/0000
High energy neutrinos from active galactic nuclei
Seminari DAM (724, ICC building, UB Campus)
Despite intense inquiry, the sources at the origin of the high-energy neutrinos revealed by IceCube are still unknown. The potential correlation of an IceCube event with a flaring gamma-ray source has recently focused the attention on blazars, active galactic nuclei (AGN) with a relativistic jet pointing to the Earth.
CSIC
31/01/2020 - 00/00/0000
Nuclear activity and star formation in local Luminous Infrared Galaxies
Sala Alberto Lobo (ICE building, UAB Campus)
Luminous infrared galaxies (LIRGs) dominate the cosmic infrared background, and hence their study is crucial to understand galaxy formation and evolution. Furthermore, their extreme environments make them ideal laboratories to probe both star formation, nuclear activity, and the interplay between both phenomena.
UB
31/01/2020 - 00/00/0000
Corpuscular scaling relations in bootstrapped Newtonian gravity
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
The corpuscular model describes black holes (BHs) as condensates of a large number of gravitons at the critical point. Therefore, self-gravitating systems are depicted as purely quantum states with no central singularity, marking a clear departure from the usual semi-classical picture of quantum field theory on curved (classical) backgrounds.
UB
30/01/2020 - 00/00/0000
Highly Magnified Cosmological Sources in Galaxy Cluster Lenses
DAM Seminar (724, ICCUB building, UB Campus)
Individual luminous stars or compact star-forming complexes in distant galaxies have been observed by the Hubble Space Telescope in the field of strong lensing massive galaxy clusters. These sources are fortuitously located in the proximity of the lensing caustic and are tremendously magnified by factors in the hundreds or larger.
CSIC
24/01/2020 - 00/00/0000
Electromagnetic counterpart of gravitational wave events
Sala Alberto Lobo (ICE building, UAB Campus)
In the last few years, the gravitational wave (GW) interferometers LIGO and Virgo proved their ability to detect compact mergers and, with the spectacular case of GW 170817. Thanks to them, it is clear that there is a lot to learn from the prompt identification of the electromagnetic counterpart of the GW trigger.
UB
23/01/2020 - 00/00/0000
Revealing the structure of the Milky Way via parallax observations of maser sources
DAM Seminar (724, ICCUB building, UB Campus)
Edwin Hubble showed in 1926 that galaxies can be classified into three groups depending on their shape: ellipticals, spirals and irregulars. We know that our own Galaxy has a spiral shape. However, the details of the galactic structure like the number of spiral arms or their exact location are still under debate. In the first part of this talk, I will present recent efforts to unveil the structure of our Milky Way, a complicated endeavour due to our position in the Galaxy.
UB
23/01/2020 - 00/00/0000
Corpuscular scaling relations in bootstrapped Newtonian gravity
DAM seminar room (724, ICCUB building, UB Campus)
The corpuscolar model describes black holes as condensates of a large number of gravitons at the critical point. Therefore, self-gravitating systems are depicted as purely quantum states with no central singularity, marking a clear departure from the usual semi-classical picture of quantum field theory on curved (classical) backgrounds.
UB
21/01/2020 - 00/00/0000
Simulations at the Dwarf Scale: From Violent Dwarfs at Cosmic Dawn and Cosmic Noon to Quiet Discs today
Seminar DAM (742, ICCUB building, UB Campus)
Dwarf galaxies with stellar masses of 109 Msun can be explored at high and low redshifts and they give a glimpse of the different conditions of galaxy formation at different epochs.
UB
20/01/2020 - 00/00/0000
Gravitational Wave Events: Detection and Present Status
DAM Seminar (724, ICCUB building, UAB Campus)
Chirping gravitational wave signals from compact binary Coalescence were detected for the first time during LIGO/Virgo O1 and O2 observing runs. The majority of the events reported thus far came from binary systems of fairly heavy stellar mass black holes located at cosmological distances.
CSIC
17/01/2020 - 00/00/0000
STARS: Telescope and space mission scheduling towards a multi-observatory framework
Sala Alberto Lobo (ICE building, UAB Campus)
Efficient scheduling of astronomical observatories and space missions is a challenge with an increasing complexity as the observation strategies are becoming more sophisticated and operational costs are higher. Astronomical surveys require a huge number of observations, implying the need to use efficient schedulers to fulfill and optimize specific constraints.
UB
16/01/2020 - 00/00/0000
A novel approach to diffusing the black hole information paradox
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
We will briefly review the issue of "information loss" during the Hawking evaporation of a black hole, and argue that the quantum dynamical reduction theories, which have been developed to address the measurement problem in quantum mechanics, possess the elements to diffuse the “paradox” at the qualitative and at the quantitative level, leading to what seems to be an overall coherent picture.
10/01/2020 - 00/00/0000
White dwarfs as Advanced Physics laboratories: the axion case
Sala Alberto Lobo (ICE building, UAB Campus)
The shape of the luminosity function of white dwarfs (WDLF) is sensitive to the characteristic cooling time and, therefore, it can be used to test the existence of additional sources or sinks of energy such as those predicted by alternative physical theories.
CSIC
08/01/2020 - 00/00/0000
Global Hydrogen Cosmology Data Analysis for Rigorously Separating the Signal from Systematics
Sala Alberto Lobo (ICE building, UAB Campus)
I will discuss our data analysis for sky-averaged 21-cm observations and the status of the experiments for which we are currently developing specific applications of this pipeline, the ground-based Cosmic Twilight Polarimeter (CTP) and the space-based Dark Ages Polarimeter PathfindER (DAPPER).
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya