[Todos] ANUNCIO PRÓXIMO SEMINARIO- IFLP/DTO FÍSICA

[manias en fisica.unlp.edu.ar]

Les agradezco la difusión del anuncio del próximo seminario del ciclo
de Coloquios y Seminarios que se organizan en el Instituto de Física La
Plata/ Departamento de Física.

SEMINARIO  DEL IFLP y DEL DEPARTAMENTO
Martes 9 de abril 11:00hs – AULA CHICA

TÍTULO: "The cosmological constant problem and the renormalization group"

EXPOSITOR: Ilya L. Shapiro
Departamento de Fisica, ICE, Universidade Federal de Juiz de Fora, Brasil

RESUMEN: I will present an elementary introduction to the Cosmological
Constant (CC) problem. There are indeed several distinct problems, one of
themis that many people apply the cut-off regularization in a very naive
way and misinterpret the results as a fundamental difficulty. From the
other side there is a very tuff CC problem, which results from the
existence of many independent contributions to the same small quantity,
that is the CC, or, equivalently, energy density of vacuum. The real CC
problem consists in the enormous precision of the requested fine-tuning
for one of these contributions. The CC problem is essentially the
hierarchy problem, which comes from the "conflict" between the particle
physics scale where we evaluate the mentioned contributions and the tiny
cosmic scale where we observe their sum. It is clear that the use of
Quantum Field Theory methods in curved space-time is necessary for better
understanding of the CC problem, in both early and late universe cases. In
particular, there is a possibility of variable CC due to the quantum
effects of matter fields. This possibility can not be proved or ruled out
at the present-day state of art in the field, and this opens the door open
for interesting phenomenological applications.

Lugar: Aula Chica del Departamento de Física de la Facultad de Ciencias
Exactas; calle 49 y 115

Contacto: manias at fisica.unlp.edu.ar

En archivo adjunto está la información para difundir en carteleras.
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