Seminar with Prof. Jorge Zanelli – Unconventional Supersymmetry – 08/November/2013 – 10:00:00 AM

04/11/2013 07:00

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:  

Unconventional Supersymmetry 

Prof. Jorge Zanelli

Centro de Estudios Científicos (CECS),  Valdivia –  Chile 

Abstract: 

A gauge theory for a superalgebra is constructed. The local symmetry includes an internal gauge group, the Lorentz group and supersymmetry generators. The important distinctive features between this theory and standard supersymmetries and supergravities are:

i) The number of fermionic and bosonic states are not necessarily equal.

ii) No additional superpartners appear,  “bosoninos” or s-leptons are absent.

iii) Although this supersymmetry includes gravity, there is no gravitino.

iv) Fermions acquire mass from their coupling to the background or from self-couplings. Bosons remain massless.

In odd dimensions, the Chern-Simons form provides an action invariant under the entire gauge. In even dimensions, the Yang-Mills form is the only natural option and the symmetry breaks down to (Internal Gauge Group) (Lorentz Group)

Following the Townsend-MacDowell-Mansouri construction starting with a osp(4|2) connection, a Lagrangian invariant under the subalgebra u(1) x so(3,1) is obtained, and the only non-standard additional piece is the Nambu-Jona-Lasinio term. 

Date: 8/November/2013 – (Friday) – Place: Auditório do Bloco G – Sala 419 – Time:10:00:00 AM

Seminario con el prof. Breno Imbiriba – Medição de CO2 Atmosférico Global pelo Infravermelhor Térmico: resultados, dificuldades e prospécto – 6 de noviembre de 2013 – 10:00:00 AM

01/11/2013 10:00

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:  

Medição de CO2 Atmosférico Global pelo Infravermelhor Térmico:resultados, dificuldades e prospecto. 

Breno Imbiriba

Joint Center for Earth Systems Technology (JCET)

University of Maryland Baltimore County (UMBC) 

Abstract: 

A medição global de CO2 através de sensoriamento remoto ainda é uma área nascente porém importante. Aqui apresentamos a análise de nove anos de dados do Atmospheric Infrared Sounder (AIRS) – um sensor hiper-espectral do infravermelho térmico (4 à 12 µm), a bordo do satélite AQUA-NASA, com o qual fazemos medições de CO2 troposférico global. Estas medições dependem diretamente dos modelos atmosféricos de temperatura e vapor-d’água utilizados, nos permitindo inferir sobre a qualidade de tais modelos. Para utilização mais efetiva das medições, os resultados, calibrados com observações de aviões, são assimilados em um modelo de transporte produzindo resultados positivos. Finalmente comparamos com dados do instrumento TANSO – que mede CO2 utilizando o infravermelho próximo. 

Date: 6/November/2013 – (Friday) – Place: Sala de Reuniões do Dpeto de Física (Sala 114) – Time: 10:00:00 AM

Seminar with prof. Prof. Bruno Marcos – Collisional relaxation of systems of particles with long range interactions – 1/November/2013 – 10:00:00 AM

27/10/2013 08:00

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:  

Collisional relaxation of systems of particles with long range interactions 

Prof. Bruno Marcos

Université de Nice – Sophia Antipolis – França 

Abstract: 

There are many systems which present long range interactions, such gravitational systems, two-dimensional vortices, cold atoms, etc. In this talk, I will start explaining the scenario of their evolution, which consists first in the generic formation of out-of-equilibrium long lived states, called “Quasi Stationary States” and then a (comparatively) very slow relaxation towards thermal equilibrium. Then, I will focus on two topics related to the second

part of the evolution: (i) the existence of Quasi Stationary States depending of the range of the interaction and (ii) the validity of the Chandrasekhar approximation in inhomogeneous systems. 

Date: 1/November/2013 – (Friday) – Place: Auditório do Bloco G – Sala 419 – Time:10:00:00 AM

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