Colóquios

ago

15

2024

Distillation of quantum non-Markovianity | Colóquio DFMA

By cblanco

Data:

quinta-feira, 15 Agosto, 2024 - 14:00 até 17:00

Palestrante:

Profa. Nadja Bernardes - UFPE

Resumo:

Resumo: Non-Markovianty of open quantum systems dynamics is a physically relevant property which is usually associated with the backflow of (quantum) information. Using this paradigmatic marker, we develop an operational framework to investigate how non-Markovianity for qubit dynamics can be distilled when many copies of the channels are used, possibly allowing for a stronger effect on the backflow of information.

ago

13

2024

Strings as arrays of particles | Colóquio DFMA

By secfma

Data:

terça-feira, 13 Agosto, 2024 - 14:00 até 16:00

Palestrante:

Dr. Renann Lipinski Jusinskas (CEICO)

Resumo:

Abstract: In this talk I will informally discuss a recent proposal in which the Polyakov action emerges as a sort of low energy limit of an interacting array of relativistic particles. The model is relatively simple and is still under investigation. No previous knowledge on string theory is required.

jul

02

2024

"Explosões de Buracos Negros?" por S. Hawking: Cinquenta Anos de Legado | Colóquio DFMA

By cblanco

Data:

terça-feira, 2 Julho, 2024 - 16:00 até 17:00

Palestrante:

Dr. Bruno Arderucio (UNAM)

Resumo:

Resumo: Há cinquenta anos, um trabalho seminal de Stephen Hawking foi publicado na revista Nature. Nele, foi-se anunciada a radição emitida por buracos negros que levaria o nome do autor. Desde então, o fenômeno foi intensamente estudado por inúmeros autores e influenciou diversos campos da física teórica. Neste colóquio, exploramos a relevância da descoberta e algumas das repercussões que ainda hoje são estudadas. Daremos ênfase a avanços recentes na termodinâmica de buracos negros, ao chamado "paradoxo da informação" e ao relacionado "paradoxo do tempo de Page".

abr

23

2024

Defect RG flows in 3d Chern-Simons-matter theory | Colóquio DFMA

By cblanco

Data:

terça-feira, 23 Abril, 2024 - 16:00

Palestrante:

Dra. Márcia Tenser

Resumo:

Abstract: In this talk I would like to discuss the defect renormalization group flows recently found in ABJM theory. In such a setting, we find RG flow trajectories that may or may not preserve some subset of the original N=6 supersymmetry. The $\beta$-functions have a rich spectrum of fixed points representing (super)conformal defects that provide a rich arena to study quantum effects in 2+1 dimensional theories. This sheds new light on universal information about the theory, such as the Bremsstrahlung function, and possibly on the holographic dual setting of strings in AdS4xCP3.

mar

01

2024

Probes of ultralight dark matter and primordial black holes with gravitational-wave detectors | Colóquio DFMA

By cblanco

Data:

sexta-feira, 1 Março, 2024 - 16:00 até 17:30

Palestrante:

Dr. Andrew Miller

Resumo:

Resumo: Gravitational-wave interferometers can be used to probe the existence of dark matter. Different types of dark matter, such as sub-solar primordial black holes, axions and dark photons, could leave different imprints on gravitational-wave detectors. While arising from physically different sources, such signals share common traits, and can be searched for with similar methods. In this talk, I will explain how persistent, quasi-monochromatic signals in ground-based detectors could arise from each of the aforementioned dark matter candidates. I also describe some of our search methods and summarize results from the most recent observing runs of Advanced LIGO, Virgo, and KAGRA.

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