A5029754217- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Noncommutative and Quantum Gravity Theories
- Advanced Differential Geometry Research
- Particle physics theoretical and experimental studies
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Spectral Theory in Mathematical Physics
- advanced mathematical theories
- Quantum chaos and dynamical systems
- Astrophysics and Cosmic Phenomena
- Experimental and Theoretical Physics Studies
- Quantum and Classical Electrodynamics
- Quantum Mechanics and Non-Hermitian Physics
- Earth Systems and Cosmic Evolution
- Seismic and Structural Analysis of Tall Buildings
- Blind Source Separation Techniques
Lawrence Berkeley National Laboratory
2024
Universidad de Guadalajara
2013-2023
National University of Mar del Plata
2009-2011
Universidad de Guanajuato
2009-2011
Fundación Ciencias Exactas y Naturales
2009-2011
Universidade Federal da Paraíba
2006-2010
Universidad Michoacana de San Nicolás de Hidalgo
2004-2007
Centre de Physique Théorique
1971
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman-$\alpha$ forest tracers first year observations Dark Energy Spectroscopic Instrument (DESI), to be released DESI Data Release 1. BAO provide robust measurements transverse comoving distance Hubble rate, or their combination, relative sound horizon, seven redshift bins over 6 million extragalactic objects range $0.1<z<4.2$. data alone are consistent with standard flat...
Abstract We implement Crossing Statistics to reconstruct in a model-agnostic manner the expansion history of universe and properties dark energy, using DESI Data Release 1 (DR1) BAO data combination with one three different supernova compilations (PantheonPlus, Union3, DES-SN5YR) Planck CMB observations. Our results hint towards an evolving emergent energy behaviour, negligible presence at z ≳ 1, varying significance depending on sets combined. In all these reconstructions, cosmological...
Abstract Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of Universe through galaxy clustering. Density-field reconstruction is now widely adopted procedure for increasing precision and accuracy BAO detection. With goal finding optimal settings be used in DESI 2024 analysis, we assess sensitivity post-reconstruction constraints different choices our analysis configuration, performing tests on blinded data from first year observations (DR1),...
Abstract In preparation for the next generation of galaxy redshift surveys, and in particular year-one data release from Dark Energy Spectroscopic Instrument (DESI), we investigate consistency a variety effective field theory models that describe galaxy-galaxy power spectra space into quasi-linear regime using 1-loop perturbation theory. These are employed pipelines velocileptors , PyBird Folps ν . While these have been validated independently, detailed comparison with consistent choices has...
Abstract In this paper we use the collapse metric obtained by Carneiro and Fabris to calculate power spectrum associated gauge invariant fluctuations of during formation a primordial scalar black hole at end inflation. We assume that local perturbations in vacuum energy density can means inflaton field, generating sin\-gu\-la\-ri\-ty as shown Fabris. Employing representative term series expansion scale factor obtain nearly for second order approximation factor. Thus, holes be considered...
Abstract The first year of data from the Dark Energy Spectroscopic Instrument (DESI) contains largest set Lyman- α (Ly ) forest spectra ever observed. This data, collected in DESI Data Release 1 (DR1) sample, has been used to measure Baryon Acoustic Oscillation (BAO) feature at redshift z = 2.33. In this work, we use a 150 synthetic realizations DR1 validate 2024 Ly BAO measurement presented [1]. sets are based on Gaussian random fields using log-normal approximation. We produce realistic...
We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy are combined with DESI Lyman-$\alpha$ forest BAO results presented in a companion paper. The DR2 consistent DR1 SDSS, their distance-redshift relationship matches those recent compilations supernovae (SNe) over same redshift range. well...
We present updated constraints on the parameters of an axion dark energy model, for which we took into account properties its characteristic potential and full cosmological evolution. show that values appear sufficiently constrained by data, including latest DESI DR1, are consistent with theoretical expectations a field mass $m_a$ in ultralight regime $\log (m_a c^2/\mathrm{eV}) \simeq -32.6$, effective scale $f_a$ close to reduced Planck (f_a/M_\mathrm{Pl}) -0.22$. Our results also support...
Abstract We present the Ly α Continuum Analysis Network (LyCAN), a convolutional neural network that predicts unabsorbed quasar continuum within rest-frame wavelength range of 1040–1600 Å based on red side emission line (1216–1600 Å). developed synthetic spectra Gaussian mixture model representation nonnegative matrix factorization (NMF) coefficients. These coefficients were derived from high-resolution, low-redshift ( z < 0.2) Hubble Space Telescope/Cosmic Origins Spectrograph (COS)...
We propose a novel formalism for inflation from 5D vacuum state which could explain both, seeds of matter and magnetic fields in the early universe.
We investigate gauge invariant scalar fluctuations of the metric during inflation in a non-perturbative formalism framework recently introduced scalar-tensor theory gravity formulated on Weyl-Integrable geometry. found that Weyl field can play role inflaton this theory. As an application we study case power law inflation. In quasi-scale invariance spectrum for is achieved determined values $\omega$ parameter our physical has geometrical origin.
We investigate if a recently introduced formulation of general relativity on Weyl-integrable geometry contains cosmological solutions exhibiting acceleration in the present cosmic expansion. derive conditions to have expansion universe and obtain particular solution for Weyl scalar field describing model time concordance with data combination Planck + WP BAO SN.
A formalization of the recently introduced formalism for inflation is developed from noncompact Kaluza-Klein theory. In particular, case a single scalar field inflationary model studied. We obtain that potential, which assume different representations in frames, has geometrical origin.
In this talk notes we expose the possibility to induce cosmological constant from extra dimensions a geometrical framework where our four-dimensional Riemannian spacetime is embedded into five-dimensional Weyl integrable space. particular following approach of induced matter theory (IMT) show that when go down five four may recover energy momentum tensor IMT plus term determined by presence scalar field on bulk.
We study a stochastic formalism for nonperturbative treatment of the inflaton field in framework noncompact Kaluza–Klein (KK) theory during an inflationary (de Sitter) expansion, without slow-roll approximation.
We investigate (2+1)-dimensional gravity in a Weyl integrable spacetime (WIST). show that, unlike general relativity, this scalar-tensor theory has Newtonian limit for any dimension and that three dimensions the congruence of world lines particles pressureless fluid non-vanishing geodesic deviation. present discuss class static vacuum solutions generated by circularly symmetric matter distribution certain values parameter ω corresponds to with naked singularity at center distribution....
Considering a five-dimensional (5D) Riemannian spacetime with particular stationary Ricci-flat metric, we obtain in the framework of induced matter theory an effective 4D static and spherically symmetric metric which give us ordinary gravitational solutions on small (planetary astrophysical) scales, but repulsive (anti gravitational) forces very large (cosmological) scales ω=−1. Our approach is unified manner to describe dark energy, matter. We illustrate two examples, solar system great...
In this Letter we study gauge-invariant metric fluctuations from a noncompact Kaluza–Klein (NKK) theory of gravity in de Sitter expansion. We recover the well-known result δρ/ρ≃2Φ, obtained standard 4D semiclassical approach to inflation. The spectrum for these should be dependent fifth (spatial-like) coordinate.
We develop a type of Kaluza–Klein formalism in (4 + 4)-dimensions. In the framework this formalism, we obtain new kind Schwarzschild metric solution that, via Kruskal–Szequeres, can be interpreted as mirror black and white holes. found that hole (3 1)-dimensions supports idea original spacetime extended to 4)-signature. Using octonions, also discuss linearized gravity