A5055486538- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Particle physics theoretical and experimental studies
- Relativity and Gravitational Theory
- Pulsars and Gravitational Waves Research
- Advanced Differential Geometry Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- High-Energy Particle Collisions Research
- Geometric Analysis and Curvature Flows
- Quantum Chromodynamics and Particle Interactions
- Educational Innovations and Technology
- Advanced Graph Theory Research
- Geometry and complex manifolds
- Solar and Space Plasma Dynamics
- Advanced Fiber Laser Technologies
- Particle Detector Development and Performance
- Quantum Mechanics and Applications
- Numerical methods for differential equations
- Digital Games and Media
Adolfo Ibáñez University
2023-2025
Arturo Prat University
2020-2024
Universidad de Santiago de Chile
2019-2020
Universidad Nacional Autónoma de México
2010-2020
Universidad Andrés Bello
2019-2020
Centro Científico Tecnológico de Valparaíso
2014-2016
Federico Santa María Technical University
2013-2016
Valparaiso University
2015
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
The method of topological renormalization in anti--de Sitter (AdS) gravity consists adding to the action a term which renders it finite, defining at same time well-posed variational problem. Here, we use this prescription work out thermodynamics asymptotically locally (AlAdS) spacetimes, focusing on physical properties Misner strings both Taub-NUT-AdS and Taub-Bolt-AdS solutions. We compute contribution string entropy by treating footing AdS AlAdS sectors. As is found correctly account for...
A bstract We study the renormalization of a particular sector Horndeski theory. In particular, we focus on nonminimal coupling scalar field to Gauss-Bonnet term and its kinetic Einstein tensor. Adopting power expansion function that couples term, find specific conditions their coefficients such action charges are finite. To accomplish latter, add finite set intrinsic boundary terms. The contribution generates an effective mass, allowing us recover modified Breitenlohner-Freedman bound....
We study a conformally coupled scalar-tensor theory with quartic potential possessing local conformal symmetry up to boundary term. show that requiring the restoration of full fixes counterterms render on-shell action finite. The building block resulting is covariant tensor which constructed out metric and scalar field it has same weight as Weyl tensor. This allows us obtain for sector in closed form. finiteness complete version suggestive on validity renormalization prescription. extend...
We study a scenario allowing solution of the strong charge parity problem via Peccei-Quinn mechanism, implemented in gravity with torsion. In this framework there appears torsion-related pseudoscalar field known as Kalb-Ramond axion. compare it so-called Barbero-Immirzi axion recently proposed literature also context show that they are equivalent from viewpoint effective theory. The phenomenology these torsion-descended axions is completely determined by Planck scale without any additional...
Four-dimensional homogeneous static and rotating black strings in dynamical Chern-Simons modified gravity, with without torsion, are presented. Each solution is supported by a scalar field that depends linearly on the coordinate span string. The solutions locally $\mbox{AdS}_3 \times \mathbb{R}$ they represent continuation of Ba\~nados-Teitelboim-Zanelli hole. Moreover, belong to so-called sector space theory, since Cotton tensor contributes nontrivially equations. case nonvanishing torsion...
We present different Taub-NUT/Bolt-anti de Sitter (AdS) solutions in a shift-symmetric sector of Horndeski theory gravity possessing nonminimal kinetic coupling scalar fields to the Einstein tensor. In four dimensions, we find locally and asymptotically AdS nontrivial field. higher analytical Taub-NUT/Bolt-AdS p-branes solitons are obtained, supported by existence p with axionic profile. The thermodynamical properties studied through Euclidean methods it is found that first law...
Euclidean AdS wormholes provide a natural setup for studying the AdS/CFT correspondence with multiple boundaries. However, from bottom-up perspective, they cannot be embedded in four-dimensional Einstein-AdS-Maxwell theory if these boundaries have positive curvature. Nevertheless, Maldacena and Maoz showed that this obstruction could circumvented by introducing merons Einstein-AdS-Yang-Mills theory. In work, we show Euclidean-AdS also exist Einstein-AdS-Skyrme theory, whose matter sector...
Euclidean anti–de Sitter (AdS) wormholes provide a natural setup for studying the Sitter/conformal field theory (AdS/CFT) correspondence with multiple boundaries. However, from bottom-up perspective, they cannot be embedded in four-dimensional Einstein-AdS-Maxwell if these boundaries have positive curvature. Nevertheless, Maldacena and Maoz showed that this obstruction could circumvented by introducing merons Einstein-AdS-Yang-Mills theory. In work, we show Euclidean-AdS also exist...
We study the Kaluza-Klein dimensional reduction of Lovelock-Cartan theory in five-dimensional spacetime, with a compact dimension $S^1$ topology. find cosmological solutions Friedmann-Robertson-Walker class reduced spacetime. The torsion and fields arising from induce nonvanishing energy-momentum tensor four dimensions. describing expanding, contracting bouncing universes. model shows dynamical compactification extra some regions parameter space.
Unimodular gravity is an appealing approach to address the cosmological constant problem. In this scenario, vacuum energy density of quantum fields does not gravitate and appears merely as integration constant. Recently, it has been shown that diffusion may arise in theories with spontaneous collapse compatible framework by virtue its restricted diffeomorphism invariance. New studies suggest phenomenon could lead higher-order equations context homogeneous isotropic Universe, affecting...
In this paper we argue the possibility that fermion masses, in particular quarks, originate through condensation of a fourth family interacts with all quarks via contact four-fermion term coming from existence torsion on spacetime. Extra dimensions are considered to avoid hierarchy problem.
Unimodular gravity is an interesting approach to address the cosmological constant problem, since vacuum energy density of quantum fields does not gravitate in this framework, and appears as integration constant. These features arise a consequence considering constrained volume element 4-form that breaks diffeomorphisms invariance down preserving diffeomorphisms. In work, first-order formulation unimodular presented by spin matter source spacetime torsion. Even though most general Lagrangian...
Scalar-tensor gravity theories with a nonminimal Gauss-Bonnet coupling typically lead to an anomalous propagation speed for gravitational waves, and have therefore been tightly constrained by multimessenger observations such as GW170817/GRB170817A. In this paper we show that is not general feature of scalar-tensor theories, but rather consequence assuming spacetime torsion vanishes identically. At least the case coupling, removing torsionless condition restores canonical dispersion relation...
It has been recently shown that there is a particular combination of conformal invariants in six dimensions which accepts generic Einstein space as solution. The Lagrangian this Conformal Gravity theory -- originally found by Lu, Pang and Pope (LPP) can be conveniently rewritten terms products covariant derivatives the Weyl tensor. This allows one to derive corresponding Noether prepotential Noether-Wald charges compact form. Based on expression, we calculate six-dimensional Critical at...
We study conserved charges and thermodynamics of analytic rotating anti-de Sitter black holes with extended horizon topology -- also known as strings in dynamical Chern-Simons modified gravity. The solution is supported by a scalar field an axionic profile that depends linearly on the coordinate spans string. compute making use renormalized boundary stress-energy tensor. Then, adopting Noether-Wald formalism, we string entropy obtain its area law. Indeed, reduced Euclidean Hamiltonian...
We present novel regular Euclidean solutions to General Relativity in presence of Maxwell and conformally coupled scalar fields. In particular, we consider metrics the Eguchi-Hanson Taub-NUT families solve field equations analytically. The have nontrivial topology labeled by Hirzebruch signature Euler characteristic that compute explicitly. find that, although are locally inequivalent with original (anti-)self-dual metric, their asymptotically limit leads same global properties. revisit...
We study the axial anomaly of Dirac spinors on gravitational instanton backgrounds in context nonlinear electrodynamics. In order to do so, we consider Einstein gravity minimally coupled a recently proposed conformal electrodynamics that enjoys duality transformation invariance. These symmetries allow us generalize Eguchi-Hanson configuration while preserving its geometry. then compute index nonlinearly charged and Taub-NUT configurations. find there is an excess positive chiral fermions...
Abstract We present a streamlined proof that any Einstein-AdS space is solution of the Lu, Pang and Pope conformal gravity theory in six dimensions. The reduction into Einstein manifestly shows action latter can be written as Einstein-Hilbert term plus Euler topological density an additional contribution depends on Laplacian bulk Weyl tensor squared. prescription for obtaining this form by embedding Weyl-invariant purely metric theory, was dubbed Conformal Renormalization its resulting shown...
We study the (anti-)self-duality conditions under which electric and magnetic parts of conserved charges dyonic Kerr-Newman-NUT-anti-de Sitter solution become equivalent. Within a holographic framework, stress tensor boundary Cotton are computed from electric/magnetic content Weyl tensor. The tensor/Cotton duality is recovered along (anti-)self-dual curve in parameter space. show that latter not only implies relation for mass but also angular momentum. partition function to first order...
It is well known that inclusion of torsion in the gravitational formalism, leads to four-fermion interactions. Although coupling constant this interaction strongly suppressed four dimensions, its value enhanced models with $n$ extra dimensions. In context, we reinterpret recent limits established by LHC experiments contact interactions, set bounds on size For $n=2$, are comparable those literature, while for $n\ge 3$ volume dimensions constrained.
We study gravity with torsion in extra dimensions and derive an effective four-dimensional theory containing four-fermion contact operators at the fundamental scale of quantum TeV range. These may have impact on low-energy observables can manifest themselves or be constrained precision measurements. calculate possible contributions these to some one-loop level. show that existing data lepton decay mode $Z$ boson set limits compactification radius, which are more stringent than previously...
It is well known that a theory with explicit Lorentz violation not invariant under diffeomorphisms. On the other hand, for geometrical theories of gravity, there are alternative transformations, which can be best defined within first-order formalism, and regarded as set improved These symmetries local translations and, among features, they covariant off shell. thus interesting to study if translations. In this work, an example such theory, minimal gravity sector Standard Model Extension,...
We study non-Einstein Bach-flat gravitational instanton solutions that can be regarded as the generalization of Taub-NUT/Bolt and Eguchi-Hanson Einstein gravity to conformal gravity. These include spaces which are either asymptotically locally flat spacetimes (ALF) or Anti-de Sitter (AlAdS). Nevertheless, with different asymptotic conditions exist: we find geometries present a weakened AlAdS asymptotia, exhibiting typical low decaying mode This permits identify simple Neumann boundary...