Title: Numerical Relativity: from Black Hole collisions to the Quark-Gluon Plasma
Author: Miguel Zilhao (email@example.com)
Abstract: We give a brief overview on the field of Numerical Relativity, discussing its history, major milestones and recent developments. Furthermore, I will explain how we can now use these tools to evolve Black Holes collisions as well as simulate the Quark-Gluon plasma, formed in relativistic colliders such as RHIC or the LHC.
Title: Constraints on the NLO coefficients of the Effective Chiral Lagrangian
Author: Albert Feijoo (firstname.lastname@example.org)
Abstract: Chiral Perturbation Theory (ChPT) is an effective theory that has shown to be a powerful tool describing the strong interaction at low energies where a perturbative treatment of QCD results inappropriate due to the large strong coupling. But ChPT is not applicable via a perturbative expansion in a region which contains any resonance. In such cases, one need to resort to non-perturbative resummations. A successful example of this is Unitarized Chiral Perturbation Theory by means of which resonances might be generated dynamically.
This framework provides us with an opportunity to constrain all the parameters which appear in the chiral effective Lagrangian, particularly the next-to-leading order (NLO) coefficients. These parameters are not fixed by the symmetries of the underlying theory (QCD) and, consequently, one needs to fit the models to the available experimental data. With this aim, we have carried out a study of the meson-baryon interaction in the S=-1 sector using a chiral SU(3) Lagrangian up to NLO and implementing unitarization in coupled channels. We have paid a special attention to the K⁻p-->KΞ reactions which are very sensitive to the NLO and Born terms. The stability of the NLO coefficients obtained from our fits is studied by the incorporation of high mass and high spin resonances like Λ(1890), Σ(2030) and Σ(2250). One can extract additional information from further processes in order to discern which models have a more realistic set of fitting parameters associated, for instance, the Λ_b decay.
Title: Localizing a Fast Radio Burst for the first time
Author: Benito Marcote (email@example.com)
Abstract: Fast Radio Bursts (FRBs) are radio transient sources that emit a single pulse with a duration of only a few milliseconds. They were firstly discovered in 2007, and nowadays we have detected tens of these events using single-dish radio observatories. However, their physical origin remains completely unknown mainly due to the limited resolution of these instruments.
Here we present the first unambiguous localization of a Fast Radio Burst. FRB 121102, which is the only FRB to have shown repeated bursts, was observed simultaneously with the 305-m Arecibo Telescope and the Karl G. Jansky Very Large Array (VLA). The detection of the bursts using Arecibo allowed us to image them with the VLA data, localizing the bursts with less than one arcsec precision. An even more precise localization was afterwards made by combining Arecibo with the European VLBI Network (EVN). The bursts are coincident with a persistent and compact radio source with a projected size of less than 0.7 pc. This radio source is located in a dwarf low-metallicity galaxy at a redshift of 0.1927.
These results provide the first confirmation of the extragalactic origin of FRBs. Additionally, we argue that a burst source associated with a low-luminosity active galactic nucleus or a young neutron star energizing a supernova remnant are the two scenarios that best match the observed data of FRB 121102.
Title: Maximum Entanglement in Particle Physics
Author: Alba Cervera (firstname.lastname@example.org)
Abstract: We present an analysis of entanglement generation by fundamental interactions. We analyze the final state amplitudes in terms of helicities and polarizations of the incoming and outgoing particles to see for which energies and configurations entanglement is allowed. As maximum entanglement is generated in all processes studied, we propose to use this property to find constraints in interaction structures and Standard Model free parameters. As an example of the first application, we study a QED model without imposing gauge symmetry and find standard QED as a unique solution that allows maximum entanglement generation. We go forward and study which constraints this idea could impose on weak interactions to find an estimation of weak mixing angle.
Title: Probing General Relativity with gravitational waves
Abstract: Last year's breakthrough discovery of gravitational waves has given us a new sense to probe and test gravity in its most extreme, strong-field regime. Although General Relativity (GR), our standard model of gravity, seems to have passed this new stress-test, many questions concerning, e.g., a unifying theory of quantum gravity or the constituents of dark matter have remained open. Candidate models aiming at resolving these issues typically involve couplings to additional fields or extensions to GR. In this talk I will give a brief overview over the most promising extensions of GR and how we can search for them in the era of actual black hole and gravitational wave observations.
Title: Hadronic molecules in the Heavy Quark Sector
Author: Martin Cleven (email@example.com)
Abstract: The discovery of the exotic state X(3872) at the beginning of this century led to a revival in hadron spectroscopy. In the following years a number of states composed by two quarks and two anti-quarks, commonly referred to as XYZ states, have been found that seem to be at conflict with the interpretation as conventional quark anti-quark mesons. This culminated in the discovery of the Zc(3900) at BES III in 2013. In this talk I will introduce the concept of Hadronic Molecules and show how it might provide an explanation for the nature of some of the XYZ states, in particular I will focus on the charmonia Y(4260) and Zc(3900).
Title: A Hilbert space mission: The spectrophotometric calibration of Gaia
Author: Michael Weiler (firstname.lastname@example.org)
Abstract: ESA's space mission Gaia is now scanning the whole sky for about two and a half years from its orbit around L2. Among the three instruments onboard the Gaia spacecraft is a low-resolution spectrograph, collecting hundreds of billions of near-UV to near-IR spectra of more than a billion objects in the sky. This talk lines out the principles of how to calibrate such an amount of spectroscopic data, collected with an instrument of truly unique design - and thus how to make Gaia's spectra fit for upcoming scientific exploitation.
Title: Modeling general relativity with metamaterials
Author: Isabel Fernandez (email@example.com)
Abstract:Analogue gravity attempts to model general relativity phenomena using other physical systems. One example are metamaterials, which are man-made materials whose electromagnetic properties can be engineered to present certain behaviours not found in nature. We will introduce these new materials and the analogy between their electrodynamics and general relativity. As an example, the optical black hole will be discussed.
Title: Diving into precision cosmology and the role of cosmic magnification
Author: José Luis Bernal (firstname.lastname@example.org)
Abstract: Cosmology has officially confirmed itself as a precision science. However, there are still some tensions among different experiments and, now that the statistical uncertainties are expected to be as small as systematics errors, further research is needed to confirm and test the Standard Cosmological Model. In addition, new cosmological probes have to be used in order to break persistent degeneracies in key cosmological parameters.
There is where cosmic magnification enters. Gravitational lensing has two effects in the image we receive from galaxies: it curves the light altering the shape of the galaxy (cosmic shear) and also magnifies it. As they are originated by the same physical phenomenon, they are sensitive to the same density field, but they depend differently on the cosmological parameters. Moreover, as the methodology is completely different, they do not share systematic errors. Hence, opening this way to probe cosmology can mean an important advance and a keystone for the future research on cosmology.
Title: Quantum properties of a binary bosonic mixture in a double well
Two condensates of identical bosons trapped in a double well, called a Bosonic Josephson Junction, present interesting quantum phenomena like Josephson oscillations and self-trapping  that have been observed experimentally . The ground state of the system depends on atom-atom interactions and on the height of the barrier between the two sites of the double well and can host relevant quantum spatial correlations . What would happen if we had two bosonic species instead of one?
The physics of a binary mixture of Bose-Einstein condensates trapped in a double-well potential is captured by a two-component two-site Bose-Hubbard model . A crucial aspect of this system is that it can host relevant entangled many-body states, e.g., Schrödinger catlike states. The richness of the binary-mixture in a double-well is the possibility of having not only spatial entanglement but also quantum correlations between the two species. Taking the atom-atom interactions within each species and among the two species as variable parameters, the many-body properties of the ground state are fully characterized by means of quantum information tools, such as the Schmidt gap or the von Neumann entropy complemented by usual many-body techniques like the computation of the condensed fractions.
 A. Smerzi, S. Fantoni, S. Giovanazzi, and S. R. Shenoy, Phys. Rev. Lett. 79, 4950 (1997).
 M. Albiez, R. Gati, J. Fölling, S. Hunsmann, M. Cristiani, and M. K. Oberthaler, Phys. Rev. Lett. 95, 010402 (2005).
 B. Juliá-Díaz, D. Dagnino, M. Lewenstein, J. Martorell, and A. Polls, Phys. Rev. A 81, 023615 (2010).
 P. Mujal, B. Juliá-Díaz, and A. Polls, Phys. Rev. A 93, 043619 (2016).
Title: The chemical evolution of the Galactic disk through Open Clusters
Author: Laia Casamiquela (email@example.com)
Abstract: The Galactic chemical evolution is the study of the transformation of gas into stars and the resulting evolution of the chemical composition of the Galaxy. In a simple model, initially, gas of primordial composition is progressively turned into stars, which return material that has been enriched with elements synthesized by nuclear reactions, back into the interstellar medium. The key is that different groups of chemical elements are synthetized in different stars (low or high mass, binaries,...) or events (stellar winds, supernovae type Ia or II,...), that are produced at different timescales.
In particular the ratio of abundances of alpha-elements over iron has long been used as an indirect age estimator. However, in the recent years several studies (Martig et al. 2015, Chiappini et al. 2015) have found that outside the solar circle this correlation is not always achieved. This results suggest that the chemical evolution of the Galaxy is far more complex than we thought.
Open Clusters are among the best tracers to adress this question, since they provide the most reliable ages and distances, and precise chemical abundances. We present the analisis of the first Open Cluster that falls out of this correlation between alpha abundance and age.
Title: Bose-Einstein graviton condensate in a Schwarzschild black hole
Author: Luciano Gabbanelli (firstname.lastname@example.org)
Abstract: A recent proposal by Dvali and Gómez states that black holes (BH) can be treated as if they consisted of a Bose-Einstein condensate (BEC) of gravitons. In this talk I will present a summary of the results obtained by digging deep into this theory. We extended Einstein-Hilbert action with a chemical potential-like term and analyzed its characteristics in detail. The expanded equations resemble a Gross-Pitaevskii equation describing a BEC trapped by the BH gravitational field. The solution for this set of equations implies the BEC vanishes outside the horizon, but is non-zero in the interior. Also provides hints for finding an exact non-trivial solution for a mean-field wave-function describing the BEC in the BH interior. With the latter solution, some relations suggested by Dvali and Gómez that involve the number of gravitons N and the BH characteristics, summarized in its Schwarzschild radius, are rederived. In our picture, these characteristic are parametrized by a single parameter: a dimensionless chemical potential.
Title: The role of gauge fields during inflation
Author: Ricardo Ferreira (email@example.com)
Abstract: Most of the early universe secrets are still left to be unravelled. The most vanilla-like ideas are in agreement with experiments and no significant deviations from standard predictions have been found.
There are however some reasons to believe that gauge fields, and in particular electromagnetic fields, might have had an important role in the early universe. These ideas also get some support from recent suggestive observations of magnetic fields in the largest scales of our observable universe.
In this talk I will present recent work done in the phenomenology and model building of gauge fields in the early universe, in particular during inflation.
Title: Weak decay of the hypertriton with effective field theory
Author: Axel Pérez-Obiol (firstname.lastname@example.org)
Abstract: In this talk I will describe the weak decay of the hypertriton, the lightest hypernucleus, within the formalism of effective field theory (EFT). An effective field theory is a systematic approximation to some underlying dynamics valid at a certain energy scale. First I will briefly introduce this concept in the context of the strong nuclear force. Then I will explain how it can be applied in the description of the weak decay of the hypertriton, focusing in the construction of an EFT for the non-mesonic weak decay transition, LambdaN-->NN. Results for the mesonic and non-mesonic decay rates without the consideration of final state interactions will be shown.
Title: Trends and noise removal using a Wavelet based modification of the Trend Filtering Algorithm: Application to wide-field surveys
Abstract: Trends, systematics and noise are present in any time domain data. Their presence results in a decrease of the photometric precision and are often cause of other unwanted effects such as incorrect signal characterization or a lower signal detection probability. Algorithms such as the Trend Filtering Algorithm (TFA) or SysRem have been used for some time in astronomical time domain surveys to deal with these systematics and improve the detection and precision of any periodic signal. In this talk we will briefly explain how these algorithms work and present a modification of TFA, called TFAW, that makes use of a Stationary Wavelet Transform based filter that tries to eliminate, as much as possible, any noise contribution and improve the characterisation of the noise- and trend-free signal. The use of TFAW results in a clear improvement of the signal-to-noise ratio, a better period estimation through an improved frequency spectrum and better signal characterization without any signal loss or changes in the shape of the signal. In addition, TFAW can be used to deal with multi periodic signals allowing to separate the different signal contributions and improving their respective light curves. TFAW is a generic algorithm that can be used to any survey provided a sample of reference time series is available. Simulated periodic signals will be presented as well as real light curves coming from the TFRM and Evryscope databases in order to show the efficiency of the algorithm.
Title: Hypernuclear decay of strangeness -2 hypernuclei
Author: Jordi Maneu (email@example.com)
Abstract: Since the discovery in 1952 of the first nuclear fragment containing strange quarks, many efforts have been put in extending our knowledge of the nuclear chart to include strange particles. Worldwide, the study of the interactions among nucleons and hyperons (three quarks bound states containing strangeness) has been a priority in the research plan of many experimental facilities. After more than sixty years of studies of the production and weak decay of bound nuclear states containing conventional nucleons and the lightest hyperon possible, the so-called Λ-hypernuclei, some attention has moved to more strange systems, as ΛΛ-hypernuclei and more recently, with proposals to study Ξ-hypernuclear spectroscopy.
In this talk I will present the formalism which allows us to calculate the experimental observables for the decay of such doubly-strange systems. I will also give an estimation of the decay rate experimentalist should expect to each possible final state.
Title: Using chemistry to trace protostellar mass accretion
Abstract: Understanding how stars gain their mass is a fundamental question of star formation with consequences for both the physical and chemical evolution of young stellar systems. In particular, is the mass accretion onto young stars smooth with time or is it better characterised by short episodic bursts of high accretion? There is increased evidence that mass accretion onto young stars is episodic, but bursts are rare and therefore difficult to observe directly. In the talk, I will present results from a novel method whereby chemistry can be used to observe the effects of an accretion bursts thousands of years after the burst itself has ended.
Title: Exploring the loose ends of the Standard Model at LHCb
Abstract: The LHC at CERN is the most powerful particle accelerator at present and can help in disentangling the existence of processes beyond the description of the Standard Model of Particle Physics. The Experimental High Energy Physics group of the ICCUB works at one of its four main detectors: LHCb. The main goals of this experiment are the study of b and c hadron properties and the understanding of the asymmetry between matter and antimatter and its origin. This talk will give an overview of the main achievements of the LHCb experiment with the data accumulated during Runs I and II of the LHC with special focus on radiative b-hadron decays, in which our group is specialised.
Title: Solar Radiation Storms: observational analysis and numerical modelling of solar energetic particle events
Abstract: Solar Energetic Particles (SEPs) events consist of ions (mainly protons) and electrons accelerated by solar eruptive events such as flares and shocks associated with coronal mass ejections (CMEs). SEPs travel along the interplanetary magnetic field and are detected by spacecraft in the heliosphere, with energies from few keV to tens of GeV for ions and hundreds of MeV for electrons. We study the properties of SEP events in terms of intensity, onset time, duration, peak intensity, and fluence. For that purpose, we make use of several in-situ measurements made by different satellites, like STEREO A-B, ACE, SOHO and, HeliosELIOS I-II, etc. In addition, we study remote measurements of electromagnetic emissions from the Sun (in white light, radio and X-rays) associated with the parent solar eruptions. Numerical models help us characterise both the propagation of the particles in interplanetary space and the timescales of their release processes. We use the SEPinversion tool to fit the intensity-time profiles measured in different fields of view during solar near-relativistic electronSEP events. This model permits us to infer the particle injection profile at the Sun and estimate the electron mean free path. We present the results we obtained for the 2014 August 1 electron event as an example.
On the other hand, our group has developed a tool, named SOLPENCO2, that provides synthetic proton intensity-time profiles of large SEP events for virtual observers at different heliocentric distances from the Sun (from 0.2 AU up to 1.6 AU). The results derived from SOLPENCO2, are used in a SEP statistical model to estimate the proton radiation environment for interplanetary missions (http://dev.sepem.oma.be). Here we present recent updates to SOLPENCO2 and discuss their impact in the SEP statistical model.
Title: Non-thermal emission from the interaction of extragalactic jets with stars.
Author: Florencia Vieyro
Title: Dynamical Vacuum Energy in the Universe: a real alternative to the rigid cosmological term
Abstract: The presence of a non-null cosmological term in Einstein's field equations became essential after the discovery of the universe's speeding up about twenty years ago. Now, Lambda is a key ingredient of the so-called concordance model. But despite its success, I will show that a large class of cosmological scenarios with dynamical vacuum energy density are able to improve the phenomenological status of the former. These "running vacuum models" consists of a nonvanishing constant term and a series of powers of the Hubble rate. Such generic structure is potentially linked to the quantum field theoretical description of the expanding Universe. An overall fit to the cosmological observables SNIa+BAO+H(z)+LSS+BBN+CMB shows that the class of RVM's appears significantly more favored than the LCDM, at an unprecedented level \sim 4.2\sigma.
Title: Technology in the ICCUB: present and future
Author: David Gascón/Jordi Portell (firstname.lastname@example.org)
Abstract: Many groups in the ICCUB are carrying research where technology is a key element, either as a tool to develop new instruments for fundamental science or even as product that can be transferred to the scientific community or to the industry. We will present a quick overview of the main current activities in instrumentation, electronics and very large data processing for space missions, particle physics experiments and other fields.
Although successful, these activities are carried out by independent groups as ICCUB lacks from a central engineering service and structure. Following the recommendation of the International Advisory Committee, this is changing rapidly.
In the first place, a technical coordination has been created very recently and has decided to focus in three main goals:
Secondly, the UB has granted a large area in PCB towers to reorganize and centralize most of the ICCUB laboratories and technology personnel.
Both actions should provide a boost to the collaboration between groups already active in technology but, even more important, should open the possibility to create a true technological unit that could help any ICCUB scientist to participate in proposals involving technology, which is often a key to open a privileged access to many space missions and experiments.
Title: Testing cosmological models with galaxy surveys
Author: Alvise Raccanelli (email@example.com)
Abstract: Current and forthcoming astrophysical observations will test cosmological theories and the physics behind them with unprecedented precision. The standard model for cosmology (ΛCDM) represents a good fit to most of the observations we have, but it is a phenomenological model with no strong theoretical foundation. One of the biggest challenges in cosmology (but of broad physical consequences) will be to understand if this is the correct model (and in this case find a theoretical framework for it) or if a new model will take place as the standard one.
I will show how we can use the large-scale structure of the universe to test a variety of cosmological models, including models that explain the accelerated expansion of the universe and the origin of dark matter.