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El límit per poder anunciar en paper seminaris i conferències en els ascensors és el divendres a les 12 hores de la setmana anterior. Amb posterioritat a aquesta data el seminari o conferència quedarà només recollit al web de la Facultat. Aleshores la publicitació en paper serà responsabilitat dels organitzadors.



Facultat de Física, Dimarts 21 de Gener de 2020, a les 12:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: Simulations at the Dwarf Scale: From Violent Dwarfs at Cosmic Dawn and Cosmic Noon to Quiet Discs today
Conferenciant: Daniel Ceverino (Universidad Autónoma de Madrid)
Abstract:

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. Using a large sample of about 300 zoom-in cosmological hydrodynamical simulations of galaxy formation I will briefly describe the formation of dwarfs at this mass scale at 3 different epochs: cosmic dawn, cosmic noon, and today. I will describe the FirstLight simulations of first galaxies at redshifts 5-15. These first dwarfs have extremely high star formation efficiencies due to high gas fractions and high gas accretion rates. At cosmic noon, z = 2, galaxy formation is a violent process. The VELA simulations have generated a set of dispersion-dominated dwarfs that show an elongated morphology due to their prolate dark-matter halos. Between z =1-0, the AGORA simulation shows the formation of a low-mass disc due to slow gas accretion.

Lloc: Seminar DAM (742)
Contacte: eduard@fqa.ub.edu
Web: http://icc.ub.edu/activity/1439

Facultat de Física, Dijous 23 de Gener de 2020, a les 12:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: Revealing the structure of the Milky Way via parallax observations of maser sources
Conferenciant: Katharina Immer (Joint Institut for VLBI ERIC)
Abstract:

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. I will introduce the Bar and Spiral Structure Legacy (BeSSeL) survey and show how we used observations of maser sources in star-forming regions via the parallax method to pinpoint the Milky Way spiral arms. I will also present some recent comparisons between BeSSeL and Gaia results. In the second part of the talk, I will focus on the Scutum spiral arm. With proper motion observations of maser sources we revealed a group of star-forming regions with large peculiar motions which are oriented towards the Galactic Centre. I will discuss our hypothesis that these motions are caused by the gravitational potential of the Galactic bar.

Lloc: Seminari DAM (724)
Contacte: secretariacientifica@icc.ub.edu
Web: http://icc.ub.edu/activity/1448

Facultat de Física, Dijous 23 de Gener de 2020, a les 14:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: Corpuscular scaling relations in bootstrapped Newtonian gravity
Conferenciant: Michele Lenzi (Universita di Bologna)
Abstract:

The corpuscolar 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. The bootstrap framework provides a simplified testing ground for the collective features of the corpuscolar picture. In particular, the scalings for the number of gravitons and their characteristic wavelength shall emerge by following a bottom up approach in which the starting point is the bootstrapped gravitational potential obtained by including non-linearities of Einstein-Hilbert gravity.

Lloc: Seminari DAM (724)
Contacte: vicente.atal@icc.ub.edu
Web: http://icc.ub.edu/activity/1450

Facultat de Física, Dimecres 29 de Gener de 2020, a les 12:00h

Seminari de l'Institut de Nanociència i Nanotecnologia

Títol: Nanoscale effects induced by mechanochemistry. Applications in catalysis
Conferenciant: Prof. Jordi Llorca, Institute of Energy Technologies (Universitat Politècnica de Catalunya)
Abstract:

The development of better catalysts is a passionate topic at the forefront of modern science. Mechanochemistry is a physicalchemical transformation caused by mechanical force. The synthesis of materials by mechanochemistry is known because of its simplicity, low cost and reproducibility, but it has not yet been used for the synthesis of supported metal catalysts. In mechanochemistry, no solvents are used and no waste is generated. The collision between two particles only lasts ca. 10-7 s, but the pressure rises to several GPa and temperature rises up to 103-104 °C, thus creating extreme conditions where the transformations take place in a unique environment difficult to create by other means. Mechanochemistry may allow the preparation of a new generation of catalysts with properties that are absolutely inaccessible with the conventional preparation methods used today. Examples of catalysts prepared by mechanochemistry in our lab will be discussed, as well as their characterization under operando conditions to identify the nature of their particular active sites.

Lloc: Sala de Graus Eduard Fontseré
Contacte: isaborit@ub.edu
Web: http://www.ub.edu/in2ub/files/IN2UB_IRS_29_01_2020.pdf

Facultat de Física, de Dimecres 12 de Febrer de 2020 a Dimecres 04 de Març de 2020, a les 13:30h

Curs del Dep. de Física de la Matèria Condensada

Títol: Minicurs Xarxes Complexes
Conferenciant: Marián Boguñá, Albert Diaz-Guilera,Maria Àngels Serrano, Jordi Soriano
Abstract:

Dia: 12 de febrer

Introducció a les Xarxes Complexes. Exemples. Models bàsics.
Professora: Maria Àngels Serrano

Dia: 19 de febrer

Fonaments teòrics. Teoria de Xarxes Complexes.
Professor: Marián Boguñá

Dia: 26 de febrer

Aspectes computacionals. Repositoris de Dades. Python.
Professor: Albert Diaz-Guilera

Dia: 4 de març

Aplicacions amb dades experimentals.
Interpretació. Gephi.
Professor: Jordi Soriano

Lloc: Aula A11G (Facultat de Física)
Contacte: ubics@ub.edu
Web: http://ubics.ub.edu/mini_curs_xarxes