Gravitation and Cosmology
The use of gravitational (quantum) metrological triangles
University of Bremen
Dr. Claus Lämmerzahl
More about this speaker soon.
Though general relativistic effects can be measured with very high precision, the gravitational constant – one of our most fundamental constants in physics – can be determined with very low precision only. In electrodynamics there are consistency relations between fundamental constants which are called metrological triangles. We show that such a concept of a metrological triangle can also be introduced in Einstein’s General Relativity. We show that it is possible to introduce a gravitational classical metrological triangle made of gravitational permittivities and permeabilities as well as of the speed of gravity. This allows to include more existing high precision tests to the exploration of the nature of gravity. As a result it is possible to improve the determination of Solar System general relativistic effects. Beyond this classical metrological triangle it is also possible to introduce a gravitational quantum metrological triangle. This is based on gravitational analogues of the Josephson effect and the quantum Hall effect. This quantum metrological triangle gives additional insight into gravity, suggests new laboratory tests for gravity, and also may allow a new definition of the kilogram.
Plenary Speakers
Tim Eifler
University of Arizona
Cosmology with the Roman Space Telescope
Carlos F. Sopuerta
Institute of Space Sciences
Solitonic echoes: Hidden symmetries behind Black Hole resonances
Martin Bojowald
Pennsylvania State University
Solitonic echoes: Hidden symmetries behind Black Hole resonances
Luis Ureña
University of Guanajuato
Ultralight axions in dark energy and dark matter models
Tonatiuh Matos
CINVESTAV
CMaDE Inflation
Alejandro Corichi
Centro de Ciencias Matemáticas UNAM, Campus Morelia
Talk Title: To be announced
Eloy Ayón Beato
CINVESTAV
Non-Noetherian conformal Cheshire effect
Omar López Cruz
INAOE
Star Formation under the Magnifying Glass in a Galaxy at z ~ 3
Guillermo Chacón Acosta
UAM-Cuajimalpa
Relativistic Equilibrium Distribution in Rapidity Space
Miguel Alcubierre
Instituto de Ciencias Nucleares, UNAM
Electrically charged bosonic stars
Ana Laura García Perciante
UAM-Cuajimalpa
Dissipation in Relativistic Fluids: General First-Order Constitutive Equations.
David Vergara
Instituto de Ciencias Nucleares, UNAM
N-bein formalism for degenerate states in the parameter space of quantum geometry
Alberto Molgado Ramos
Universidad Autónoma de San Luis Potosí
Phase space quantization of anisotropic cosmologies
Hernando Quevedo
Instituto de Ciencias Nucleares, UNAM
Entropy and time
Sebastien Fromenteau
Instituto de Ciencias Físicas, UNAM
Machine Learning the Universe: From Galaxies to Cosmology
Miguel Sabido
Universidad de Guanajuato, Campus León
Entropic cosmology, late time acceleration and the quantum bounce
Nora Bretón
CINVESTAV
Ultracompact Anisotropic Stars and Gravastars in General Relativity
Francisco Javier Turribiates Saldívar
Escuela Superior de Física y Matemáticas del Instituto Politécnico Nacional (ESFM-IPN)
TWigner function in quantum cosmology: a phase space description
Daniel Andrés Flores Alonso
Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana – Azcapotzalco
Connecting superconductors and the Gödel universe
Ricardo Chávez Murillo
UAM-Iztapalapa
From the Local Universe to Cosmic Dawn: Charting Cosmic Expansion with H II Galaxies
Mariano Chernicoff
Facultad de Ciencias, UNAM
Logarithmic corrections to the entropy of near-extremal black holes in Einstein-Gauss-Bonnet
Mariana Vargas Magaña
Faculty of Sciences, Institute of Physics, UNAM
The Universe through three years of DESI: What have we learned, and what comes next?
Flavio Joao Pineda Arvizu
Departamento de Física Universidad Autónoma Metropolitana Iztapalapa (UAM-I)
Large primordial non-Gaussianities from transient turns in multifield inflation
Hugo A. Morales Técotl
Departamento de Física Universidad Autónoma Metropolitana Iztapalapa (UAM-I)
Polymeric propagators via path integrals of particles and gravitational models
Luisa Guadalupe Jaime González
Facultad de Ciencias, UNAM
Geometric Einsteinian Cosmology and the Evolution of the Universe
Daniel Martínez Carbajal
TESOEM
Born-Infeld boson stars
Sessions
Francisco Campos Oliden
Universidad Autónoma Metropolitana
Enfoques para estudiar Gravitación Cuántica
La dificultad para formular una teoría de gravitación cuántica en un espacio-tiempo de cuatro dimensiones lleva a considerar alternativas como estudiar teorías de menor dimensión que puedan dar luz al caso de cuatro. Se presentan dos teorías de norma en un espacio-tiempo de dos dimensiones: Yang-Mills y BF, ambas con grupo de norma SU(2). Abordamos el estudio de estas últimas desde tres enfoques de cuantización: Hamiltoniano, espumas de espín y teoría de campos en grupos. Esta última captura diferentes topologías del espacio-tiempo de manera sistemática, una de sus características de mayor interés.
Gustavo Alejandro Sánchez Herrera
Universidad Autónoma Metropolitana, Unidad Iztapalapa (UAM-I)
Quantum corrections to cosmic perturbations for a bouncing background
This talk presents an effective analysis of scalar cosmological perturbations on a nonsingular FLRW background. The approach adopted allows quantum dispersions and correlations to be systematically incorporated as new degrees of freedom that modify the classical dynamics of the system. In particular, we study an FLRW model with holonomy corrections that gives rise to a cosmological bounce, coupled to the scalar perturbation sector through an effective Hamiltonian. We show that the quantum backreaction between the background and the perturbations significantly modifies the evolution of the power spectrum, both in a regime close to the bounce and in a de Sitter-like regime. A central result is that quantum corrections enhance the power spectrum and suppress the ultraviolet divergences of the classical model at high frequencies.
Jorge Luis Haro Santiago
Universidad Autónoma Metropolitana Unidad Iztapalapa
Slow Rotation in Einstein–ModMax Theory: A Consistency Analysis
We examine the consistency of slowly rotating, electrically charged configurations in Einstein–ModMax theory. We first assess an exploratory construction based on a prescribed Plebański excitation tensor and characterize the horizon geometry of the candidate metric. A preliminary first-law test motivates re-examining its electromagnetic source. For the constitutive reconstruction considered, the electromagnetic field strength exhibits a nonvanishing closure residual at second order in rotation, showing that the prescribed configuration fails to satisfy the full Einstein–ModMax system. We therefore revisit the first-order problem, constructing the field strength from a vector potential and retaining independent radial functions for frame dragging and the induced magnetic potential. Building on the established slow-rotation framework for nonlinear electrodynamics, we specialize the coupled field equations to ModMax. A first integral of the Einstein equation reduces the system to an inhomogeneous second-order radial equation, retaining the full dependence on the ModMax parameter γ. We conclude with consistency checks in the Maxwell limit and a discussion of work in progress.
Elda Guzmán Herrera
Universidad Federal de Itajubá
Multirefringence in nonlinear electodynamics and in anisotropic media
We explore the foundations of multirefringent space-times and establish how non-linearities can be mapped on the tensors of parameters constitutive of material media. The nonlinearities to discuss come from two frameworks, nonlinear electrodynamics and nonlinear dielectric properties. Non-linear electrodynamic theories predict that the vacuum behaves like a highly nonlinear optical medium and, as a consequence, it is possible that the multirefringence phenomenon exists in this medium. On the other hand, while multirefringence takes place naturally for anisotropic materials, we can induce artificial multirefringence when considering that the medium has nonlinear dielectric properties.
Fernando Aarón Castillo Aguilar
Universidad Autónoma Metropolitana (UAM)
\(L_\infty\)-Algebras of Classical Field Theories
The equations of motion, gauge symmetries, and Noether identities of a classical field theory can be encoded in a single \(L_\infty\)-algebra. I present this construction using general relativity as the main example, and discuss its relation to the Batalin–Vilkovisky formalism and its braided deformation, leading to a noncommutative formulation of gravity.
Program
View the conference program below or download the complete PDF.
Organizing Committee
Marco A. Maceda Santamaría
UAM-I
Blanca Angélica González Morales
UAM-I
