Seminars
 
UB
28/06/2019 - 00/00/0000
A primer on Axtronomy
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
We briefly describe the detection of axion dark matter to discuss how an eventual detection can be used to do galactic astronomy and to study the properties of the axionic dark matter halo.
UB
27/06/2019 - 00/00/0000
Spacetimes, symmetries and theories: beyond lorentzian geometry
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
Spacetimes, like Minkowski space, are omnipresent in physics. I will introduce a recent classification of spacetimes that generalizes the classification of maximally symmetric Lorentzian geometries and includes further physically interesting ones.
CSIC
21/06/2019 - 00/00/0000
Simulating Pixels
Sala Alberto Lobo (ICE building, UAB Campus)
Pixel simulations are essential in several phases of a project as they provide mock data that allows us to design, test and optimize the analysis of the images, prior to the real observations. They are also key to evaluate the performance of a survey and help to understand the causes of unknown systematics once the mission starts.  
UB
20/06/2019 - 00/00/0000
Quantum-assisted Machine Learning in Near-Term Quantum Devices
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
With quantum computing technologies nearing the era of commercialization and quantum advantage, machine learning (ML) has been proposed as one of the promising killer applications. Despite significant effort, there has been a disconnect between most quantum ML proposals, the needs of ML practitioners, and the capabilities of near-term quantum devices towards a conclusive demonstration of meaningful quantum advantage in the near future.
UB
20/06/2019 - 00/00/0000
Constraints on the hadron-quark phase transition and the properties of twin stars with GW170817
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
Hybrid stars are compact stars that consist of a core of pure quark or mixed hadron-quark matter and outer layers of hadronic (or nuclear) matter. Depending on its features, the hadron-quark phase transition can lead to a separate mass-radius stable branch of hybrid stars and therefore to "twin-star" solutions, i.e. stars with similar masses and different radii.
UB
20/06/2019 - 00/00/0000
Particle acceleration in protostellar jets: an observational approach
Seminari DAM (724, ICCUB building, UB Campus)
Deeply embedded protostellar jets are well known to be dominated by the emission of thermal electrons. Interestingly, in the last decades, negative spectral indices have been detected at centimeter wavelengths in some protostellar jets, indicating the presence of a non-thermal component. Detecting non-thermal emission implies the existence of relativistic particles interacting with magnetic fields, and therefore, the action of a mechanism able to efficiently accelerate them.
UB
20/06/2019 - 00/00/0000
Primordial black holes and their manifestations in astrophysical phenomena.
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
I will discuss some new ideas regarding formation of black holes in the early universe, as well as the astrophysical implications of primordial black holes, which can make up part or all of dark matter and can contribute to the synthesis of heavy elements.
UB
19/06/2019 - 00/00/0000
Binary black hole populations with LIGO/Virgo
Seminari DAM (724, ICCUB building, UB Campus)
The LIGO and Virgo detectors have observed several gravitational waves from mergers of compact binary objects, mostly binary black holes. These discoveries have allowed starting characterizing the astrophysical population of binary black holes, e.g. the distribution of masses and spins, which carry information about their origin.
UB
19/06/2019 - 00/00/0000
Late bursts of star formation in normal elliptical galaxies
Aula 507 (Pere Pascual ICCUB building, UB Campus)
We normally think of elliptical galaxies as massive, stellar systems which are quasi-spherical, filled with old stars and hot gas and essentially quiescent objects. Successful simulations find them made at high redshift, as relatively small objects which grow at early times from gas infall and at late times from accreting satellites.
UB
17/06/2019 - 00/00/0000
Shift-symmetric orbital inflation: single field or multi-field?
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
Multi-field inflation with curved field manifold attracts a lot of attention recently. From a theoretical aspect, this class of models may be more naturally realized in the UV completion of inflation. From the observational point of view, however, the current constraints on primordial non-Gaussianity and isocurvature perturbation already/marginally ruled out many of these models.
UB
14/06/2019 - 00/00/0000
Global High-Precision Phase-Delay Astrometry at mm-Wavelengths: State-of-the-Art and Technical Limits
DAM Seminar (724, ICCUB building, UB Campus)
Wide-angle high-precision differential phase-delay astrometry with VLBI at 7mm wavelength has been successfully demonstrated with state-of-the-art observations and analysis of a complete sample of 13 radio sources (Quasars and BL Lacs).
CSIC
14/06/2019 - 00/00/0000
The star formation history in the solar neighborhood as told by massive white dwarfs
Sala Alberto Lobo (ICE building, UAB Campus)
White dwarfs are the remnants of low and intermediate mass stars. Because of electron degeneracy, their evolution is just a simple gravothermal process of cooling. Recently, thanks to Gaia data, it has been possible to construct the luminosity function of massive (0.9 < M/Msun < 1.1) white dwarfs in the solar neighborhood (d < 100 pc).
UB
13/06/2019 - 00/00/0000
The equation of state and deconfinement in QCD
Pere Pascual (507, ICCUB building, UB Campus)
The low-energy phase of the theory of strong interactions, Quantum Chromodynamics (QCD), features a remarkable property of confinement - the spectrum contains composite, color-neutral states, while states with non-zero color charge are not observed.
UB
12/06/2019 - 00/00/0000
Multibaryon physics directly from quarks and gluons
Aula 507 (Pere Pascual, ICCUB building, UB Campus)
The idea of studying nuclear physics directly from the degrees of freedom of the Standard Model, quarks and gluons, has been long sought in the physics community. During the last few decades, the numerical method called lattice QCD has been able to compute the simplest quantities, such as the hadron masses, directly from first principles.
CSIC
07/06/2019 - 00/00/0000
Simulations on reverberating and superefficient pulsar wind nebulae
Sala Alberto Lobo (ICE building, UAB Campus)
Pulsar wind nebulae (PWNe) experience significant evolution in reverberation phase, when the reverse shock created by the supernova explosion travels back towards the pulsar, compressing the wind bubble.
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya