[Todos] Fwd: XVI jornada de Cosmología: Cosmo en ar en La Plata

Mar Oct 7 07:55:32 -03 2025

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Secretaría Departamental de Física
secre2 en fisica.unlp.edu.ar
Cecilia Cafiero / Alejandro Chiquino
Facultad de Ciencias Exactas
Universidad Nacional de La Plata
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-------- Mensaje original -------- 

 		ASUNTO:
 		XVI jornada de Cosmología: Cosmo en ar en La Plata

 		FECHA:
 		2025-10-06 18:27

 		REMITENTE:
 		Carlos Argüelles <carlosarguelles80 en hotmail.com>

 		DESTINATARIO:
 		Secretaría de Ciencia y Técnica <secyt en fcaglp.unlp.edu.ar>,
Asistentes de Secretaria de Fisica <secre2 en fisica.unlp.edu.ar>

Hola Betina, Alejandro 

Les quería pedir por favor de circular desde mañana este mail de
recordatorio del cosmo en ar a una semana de la fecha. Gracias. 

XVI jornada de Cosmología: Cosmo en ar (Organizadores: Carlos  Argüelles
(UNLP-CONICET), Gabriel R. Bengochea (IAFE), Diana López Nacir
(IFIBA-UBA), Martín Makler (ICIFI/UNSAM - CBPF)   

Las jornadas incluyen charlas invitadas e intervalos para discusiones,
las cuales se realizan periódicamente en distintas instituciones del
País. La finalidad principal de las mismas es motivar la comunicación e
interacción entre los distintos grupos. 

Fecha y lugar: MARTES 14 DE OCTUBRE. SALON MERIDIANO DE LA FCAG (LA
PLATA), DE 10 A 16 HS. Como
llegar:https://share.google/Zj0hvCwVIp9OAJyBb 

Cronograma  

10:00 - 10:45 hs: Nicolas Grandi (IFLP/UNLP) 

Title: De Sitter geometric inflation from dynamical singularities 

Abstract: Within the framework of geometric inflation, where the
Friedmann equation is modified to incorporate an infinite series of
higher curvature corrections arising from quantum fluctuations, we
describe the emergence of a de Sitter inflationary phase near the poles
of an arbitrary dynamical function. Our analysis is quite general and
does not depend on any specific choice of cosmological dynamics.

10:45 - 11:15 hs: Intervalo de café 

11:15 - 12 hs: Franciso Plaza (FCAG/UNLP) 

Title: Unimodular Gravity Cosmology: Constraints from DESI DR2 and
Complementary Observations 

Abstract: Motivated by the recent baryon acoustic oscillation
measurements from the DESI DR2 collaboration, in this talk we present an
extended analysis of a cosmological model based on holographic dark
energy within the framework of Unimodular Gravity (UG). In this setting,
UG allows us to account for the accelerated expansion of the Universe
through the modified gravitational dynamics themselves, while permitting
spacetime variations in the effective cosmological constant. We confront
the model with a wide range of observations, from Type Ia supernovae and
baryon acoustic oscillations (DESI DR2) to quasars and Planck CMB data.
We will discuss whether this framework alleviates the Hubble tension and
how it compares to the standard $\Lambda$CDM model in terms of Bayesian
model selection. 

12 - 13:30 hs: Almuerzo 

Bloque tarde 

13:30 - 14:15 hs: Ilya L. Shapiro (Universidade Federal de Juiz de Fora,
MG, Brazil) 

Title: 
Cosmological Constant and Renormalization Group Running in the IR 

Abstract: 
The Cosmological Constant (CC) Problem emerges in Quantum Field Theory
(QFT) in curved space-time owing to the enormous magnitude  of the
induced vacuum energy. The CC Problem looks rather complicated, such
that its solution from the first principles is not a realistic
perspective, even in a far future. After reviewing the fundamental CC
problem, we consider the possibility of a slightly variable CC because
of the quantum effects of matter fields.  There is no way to calculate
relevant quantum contributions directly in the framework of available
QFT methods. However, three different approaches converge to the unique
form of the possible running of CC and the effective Newton constant G
in the low-energy limit. Assuming covariance, or the standard quadratic
decoupling of massive fields at low energies, or using dimensional
arguments, we arrive at the unique form of a running, which leads to the
relatively simple cosmological model with potentially observable
predictions. A very recent result is that the possible running, with a
single phenomenological parameter may be useful in alleviating various
tensions existing nowadays in cosmology.  

14:15 - 15:15 hs: Intervalo de café 

15:15 - 16:00 hs: Sebastián Franchino-Viñas (IFLP) 

Title: Quantum physics in strong fields

Abstract: Quantum field theory in the presence of strong backgrounds, be
them electromagnetic or gravitational, is acquiring a central rôle in
the understanding of the primordial universe and laser laboratory
experiments. The interaction of quantum fields with classical
backgrounds gives rise to a variety of fundamental effects. In such
extreme environments, we will describe the prediction and current quest
of effects such as birefringence and pair creation. 

Saludos 

Carlos
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