Past Pizza Lunches

Nombre d'entrades: 155

27
Març 2020

ALL SEMINARS ARE CANCELLED UNTILL FURTHER NOTICE


Inici: 00:00h
Ponent: . (.)
Lloc: .

.
Inici: 00:00h
Ponent: . (.)
Lloc: .

.
20
Març 2020

ALL SEMINARS ARE CANCELLED UNTILL FURTHER NOTICE


Inici: 00:00h
Ponent: . (.)
Lloc: .

.
Inici: 00:00h
Ponent: . (.)
Lloc: .

.
13
Març 2020

ALL SEMINARS ARE CANCELLED UNTILL FURTHER NOTICE


Inici: 00:00h
Ponent: . (.)
Lloc: .

.
Inici: 00:00h
Ponent: . (.)
Lloc: .

.
28
Febrer 2020

Magneto-luminescence: from neutron stars to planets


Inici: 12:15h
Ponent: Daniele Viganò
Lloc: Alberto Lobo

Magnetic fields play an important but often little understood role in many astrophysical scenarios. In astrophysical bodies, magnetism often drives their observable behaviour, making them outshine the rest of the sources. Typical and spectacular examples are neutron stars, but in our vicinity also the…
Inici: 12:15h
Ponent: Daniele Viganò
Lloc: Alberto Lobo

Magnetic fields play an important but often little understood role in many astrophysical scenarios. In astrophysical bodies, magnetism often drives their observable behaviour, making them outshine the rest of the sources. Typical and spectacular examples are neutron stars, but in our vicinity also the Sun and Jupiter represent fascinating magnets, not to speak about the Earth itself.
More than a talk, this seminar is supposed to be a multidisciplinary brainstorming session, regarding magnetic field dynamics and observable imprints on different kind of astrophysical objects.
21
Febrer 2020

Intelligent Arxiv: Sort daily papers by learning users topic preferences


Inici: 12:15h
Ponent: Manuel Szewc (ICAS, ARG)
Lloc: Alberto Lobo Room

We present and discuss some novel applications of the Linear Discriminant Analysis (LDA) technique of Machine Learning (ML). First in the field of New Physics (NP) searches at the LHC, where we are currently applying this unsupervised ML technique to find NP as emerging topics. Motivated by this powerful…
Inici: 12:15h
Ponent: Manuel Szewc (ICAS, ARG)
Lloc: Alberto Lobo Room

We present and discuss some novel applications of the Linear Discriminant Analysis (LDA) technique of Machine Learning (ML). First in the field of New Physics (NP) searches at the LHC, where we are currently applying this unsupervised ML technique to find NP as emerging topics. Motivated by this powerful tool  we pursued the goal of sorting daily Arxiv papers in given field(s) according to individual user preference.  We model a scientific paper to be built as a combination of different scientific knowledge from diverse topics into a new problem. We apply then the (unsupervised) Machine Learning technique LDA to construct and extract topics from the corpus of papers. We obtain the topic weights of the available and new papers in the Arxiv,  and determine each user preference in topics according to each user preference in papers. This allows to determine the personal preference on new papers according to their topics weight distribution.  We have created the web interface IArxiv.org where users can read personally-sorted daily Arxiv releases (and more) while the algorithm learns his/her preferences.  Yielding therefore a more accurate sorting every day. Current IArxiv.org version runs on categories astro-ph, gr-qc, hep-ph and hep-th.
14
Febrer 2020

The Arp299B-AT1 puzzle: First resolved imaging of a tidal disruption event


Inici: 12:15h
Ponent: Miguel Pérez Torres (Instituto de Astrofísica de Andalucía (IAA-CSIC))
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)

Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). While indirect evidence has pointed out that some candidates to being TDEs may have formed a relativistic jet, no direct imaging has confirmed this…
Inici: 12:15h
Ponent: Miguel Pérez Torres (Instituto de Astrofísica de Andalucía (IAA-CSIC))
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)

Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). While indirect evidence has pointed out that some candidates to being TDEs may have formed a relativistic jet, no direct imaging has confirmed this hypothesis. I will present the discovery of an energetic nuclear transient in the central regions of the nearby galaxy merger Arp299B. The transient radiated at least 1.5E+52 erg in the infrared but remained elusive at optical and X-ray wavelengths. We interpret its properties to arise from the tidal disruption of a massive (2-6 solar masses) star that passed close to the supermassive black hole. Very-long-baseline interferometry monitoring over a decade shows unambiguous evidence for an evolving jet-like morphology. This is the first case of a confirmed resolved radio jet in a TDE ever, thus validating theoretical predictions. I will briefly discuss the implications of our results in the context of theoretical and observed rates of TDEs, as well as the possible impact of this result in terms of radiative feedback. 
07
Febrer 2020

THE SIZE OF OUR UNIVERSE


Inici: 12:15h
Ponent: Enrique Gaztañaga
Lloc: Alberto Lobo Room

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…
Inici: 12:15h
Ponent: Enrique Gaztañaga
Lloc: Alberto Lobo Room

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.
31
Gener 2020

Nuclear activity and star formation in local Luminous Infrared Galaxies


Inici: 12:15h
Ponent: Rubén Herrero (European Southern Observatory)
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)

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…
Inici: 12:15h
Ponent: Rubén Herrero (European Southern Observatory)
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)

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. On this talk I will give an overview on the main physical processes taking place in local LIRGs from a multi-wavelength perspective at different spatial scales, from their overall structure to their central hundred-parsec regions, where extreme processes take place hidden behind the dust.
24
Gener 2020

Electromagnetic counterpart of gravitational wave events


Inici: 12:15h
Ponent: Nancy Elias Rosa
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)

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…
Inici: 12:15h
Ponent: Nancy Elias Rosa
Lloc: Sala Alberto Lobo (ICE building, Campus UAB)


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. This event marked the beginning of a new era for multi-messenger astronomy with a pressing quest for electromagnetic follow up at all wavelengths, particularly in optical bands. During this talk, I will review some of the observations efforts to search and classify possible optical counterparts of GW, including an brief overview of GW 170817.
17
Gener 2020

STARS: Telescope and space mission scheduling towards a multi-observatory framework


Inici: 12:15h
Ponent: Josep Colomé Ferrer
Lloc: Alberto Lobo Room

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…
Inici: 12:15h
Ponent: Josep Colomé Ferrer
Lloc: Alberto Lobo Room

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. STARS (Scheduling Telescopes as Autonomous Robotic Systems) is a software suite developed at the institute that provides optimal schedulers for diverse infrastructures, and has been successfully applied in several ground and space-based observatories (TJO, CARMENES, CTA, ARIEL,...). STARS is based on AI algorithms and is extended to cover multi-observatory coordinated scheduling, a challenging and complex optimization problem that will allow an optimal operation of large astrophysical infrastructures to promote multi-messenger science. A light tour through the framework layers will be presented in this talk: from the requirements for different projects to the optimization algorithms used.
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
Website developed with RhinOS

Segueix-nos


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