The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

 Felipe dos Passos

 Teoria de transporte para o modelo Nambu-Jona-Lasinio SU(2) com campo magnético uniforme

Defense Committee:

 Prof. Dr. Sidney dos Santos Avancini – (president) – UFSC/FSC

Prof. Dr. Jeferson de Lima Tomazelli – (local member) – UFSC/FSC

Prof. Dr. José Ricardo Marinelli – (local member) – UFSC/FSC

Prof. Dr. Wagner Figueiredo – (local member) – UFSC/FSC

Date: 1/July/2016 – friday – Time: 10:15 am – Place: Sala 212 – Auditório do Departamento de Física

The Physics Graduate Program invites everyone to:

 Defense of Doctoral Thesis

Luana Carina Benetti

Desenvolvimento de nano-osciladores utilizando litografia de máscaras duras de TiW

Defense Committee:

 Prof. Dr. Alexandre da Cas Viegas – (president) – UFSC/FSC

Dr. Rubem Luis Somer – (external member) – CBPF/EXP

Prof. Dr. Giovanni Zangari – (external member) – University of Virginia

Prof. Dr. Márcio Santos – (membro titular) – UFSC/FSC

Prof. Dr. Ivan Helmuth Bechtold – (local member) – UFSC/FSC

Dr. Rafael Domingues Della Pace – (local member) – UFSC/FSC

Prof. Dr. Milton Andre Tumelero – (supplementary member)- UFRGS/IF

Date: 24/June/2016 – friday – Times: 9:00 am – Place: Sala 114 – Sala de Reuniões do Departamento de Física

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

  Oscilações Quânticas de Neutrinos e o Prêmio Nobel de Física de 2017 

Prof. Dr. Marcelo M. Guzzo

Instituto de Física da UNICAMP

Abstract:

O Prêmio Nobel de Física de 2015 foi concedido aos Profs. McDonald e Kajita, coordenadores dos experimentos SNO e Superkamiokande, pelas “descobertas das oscilações quânticas de neutrinos, que mostraram que os neutrinos têm massa”. Neste seminário apresentaremos as características e a história desta partícula misteriosa e onipresente cujos estudos receberam, até o momento, oito Prêmios Nobel de Física. Enfatizaremos as oscilações quânticas de neutrinos e a necessidade de massa para os neutrinos.

Date: 24/June/2016 – (friday) – Place: Sala 212 – Auditório do Departamento de Física- Time: 10h15min

 THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

  On The Spin Evolution of Isolated Pulsars 

Dr. Oliver Q. Hamil

Pós-doutorando – UFSC/FSC

 Abstract:

Isolated pulsars are a class of neutron stars that are spinning at high frequencies, and emit beams of electromagnetic radiation into space which appear like lighthouses to observers on earth. Observations of these objects span a few decades, and some of them have been documented with very high accuracy. Measurements of the pulsar rotational velocity Ω, and its time derivatives Ω and ̇ Ω, show that they slow down over time. The generally ̈ accepted explanation for the spin-down is that the pulsars behave like magnetic dipoles that lose energy in the form of electromagnetic radiation causing them to slow over time. This assumption of magnetic dipole radiation (MDR) leads to a general power law constructed from observation, Ω = ̇ −KΩ n is exactly 3 for MDR, but accurate observational measurements consistently yield values of 1.0 < n < 2.8. The reason for this discrepancy is unknown. In the present work we aim to improve understanding of the braking index through a two pronged investigation. We approach the problem by allowing for dynamical changes in the neutron star properties required in the braking index solution. We develop a frequency dependent model of the braking index that allows changing moment of inertia of the star, and changes in magnetic field properties in the MDR torque mechanism. For the first time, we have the opportunity to use physically realistic equations of state, along with state of the art computational codes to determine the dynamic properties of the neutron star needed in the modified braking index model. We probe the stars at constant baryonic rest masses ranging from 1.0M to 2.2M over a range of frequency spanning from zero to the Kepler (mass shedding) frequency for each star. We find that the braking index is sucseptible to changes in moment of inertia at very high frequencies, but unaffected in the lower frequency range where all of the reliably measured pulsars rotate. At low frequencies, however, we were able to again match the measured values by allowing for a change in the orientation of the magnetic moment of the dipole over time, in light of recent developments in the literature.

Date: 10/June/2016 – (friday) – Place: Sala 212 – Auditório do Departamento de Física- Time: 10h15min

Continue a leitura » »

 The Physics Graduate Program invites everyone to:

 Defense of Doctoral Thesis

 James Rudnei Torres

 Transições de Fases na Matéria Estranha e Aplicações na Matéria Estelar

Defense Committee:

Profª. Drª. Débora Peres Menezes – (president) – UFSC/FSC

Prof. Dr. Tobias Frederico – (external member) – ITA/DF

Prof. Dr. Odilon Lourenço da Silva Filho – (external member) – UFSCAR/CCA/DCNME

Profª. Drª. Mariana Dutra da Rosa Lourenço – (membro titular) – UFF/Rio das Ostras

Prof. Dr. Marcus Emmanuel Benghi Pinto – (local member) – UFSC/FSC

Prof. Dr. Clebson Abati Graeff – (local member) – UTFPR/Pato Branco

Prof. Dr. Celso de Camargo Barros Junior – (supplementary member)- UFSC/FSC

Date: 20/May/2016 – friday – Times: 10:00 am – Place: Sala 212 – Auditório do Departamento de Física

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

Generalized Geometric Time-Energy Uncertainty Relations  

Prof. Dr. Lucas C. Céleri

Universidade Federal de Goiás – UFG

Abstract:

 The attempt to gain a theoretical understanding of the concept of time in quantum mechanics has triggered significant progress towards the search for faster and more efficient quantum technologies. One of such advances consists in the interpretation of the time-energy uncertainty relations as lower bounds for the minimal evolution time between two distinguishable states of a quantum system, also known as quantum speed limits. We will discuss how the non uniqueness of a measure of distinguishability defined on the quantum state space affects the quantum speed limits and can be exploited in order to derive improved bounds. Specifically, we establish an infinite family of quantum speed limits valid for arbitrary evolutions, based on an information geometric formalism, thus deriving novel bounds which are tighter than any established one based on the conventional quantum Fisher information. These results can find applications in the optimization and control of quantum technologies such as quantum computation and metrology, and might provide new insights in fundamental investigations of quantum thermodynamics.

Date: 20/May/2016 – (friday) – Place: Sala 114 – Sala de reuniões do Departamento de Física – Time: 10h15min