In recent years, black holes solutions in Anti-de Sitter (AdS) spaces have attracted a great deal of attention. This is partly due to the success of AdS/CFT correspondence, which has the holographic entanglement entropy (EE) proposed by Ryu and Takayanagi as one of its most important applications

This is why, as the first part of a project that intends to study EE in higher order derivative...

We perform an MCMC analysis with the most updated SN-Ia catalog using an alternative cosmological model named Delta Gravity. This model is based on a new Einstein-Hilbert action based on a new symmetry symbolized as $\tilde{\delta}$. This theory predicts an accelerating Universe without the need to introduce a $\Lambda$ by hand in the equations.

The equations of motion that describe the...

In this work we present a review of the anomalies generated by the transition $b \rightarrow c l \nu$, where $l=e, \mu, \tau$. Specifically anomalies $R(D)$, $R(D^*)$, $R(J/\psi)$ are studied, including all possible four-Fermi operators in the effective Lagrangian that induce new physics to these ratios.

We explore the Higgs sector phenomenology in the standard model extension including one complex singlet Higgs field (SM+1CS), which implies massness right-handed neutrinos ($\sim O(M_{Z_0})$).

All scales arise from spontaneous symmetry breaking (SSB). The scalar spectrum includes two neutral CP-even states ($h$ and $H$, with $m_h < m_H$ ) and a neutral CP-odd state ($\sigma$) that can be...

The quantum decoherence phenomena has been largely studied as a sub-leading effect within the neutrino oscillation framework. From the analytical point of view, two-flavor neutrino oscillation probabilities in matter have been derived for a generic decoherence matrix. The aim of this work is, assuming a generic decoherence matrix (i.e. with off-diagonal elements non - zero) to develop...

The Two-Higgs-Doublet model (2HDM) is a simple and viable extension of the Standard Model with a scalar potential complex enough that two minima may coexist. In this contribution we investigate if the procedure to identify our vacuum as the global minimum by tree-level formulas carries over to the one-loop corrected potential. In the CP-conserving case, we identify two distinct types of...

The one-loop contributions to the decays of the CP-odd and CP-even scalar bosons $A\to Z\gamma\gamma$ and $\phi\to Z\gamma\gamma$ ($\phi=h,H$) are calculated within the framework of CP-conserving THDMs, where they are induced by box and reducible Feynman diagrams. The behavior of the corresponding branching ratios are then analyzed within the type-II THDM in a region of the parameter space...

This work describes the initial steps to develop and build a muon scattering tomography system to investigate the space and time changes in the internal density distribution inside geological structures. As a start, a very detailed simulation chain to calculate the cosmic ray background flux is being developed in order to estimate the most convenient places and the exposure time of the muon...

The Pierre Auger Observatory is designed to study cosmic ray showers at the

highest energy using a hybrid approach by combining complementary detection

techniques to study the same phenomena. One of these detectors is the

Surface Detector Array, a regular array of 1660 water Cherenkov detectors

distributed in an area of ~3000 km^2.

The surface detector has a centralized, hierarchical event...

Several studies have suggested the possibility of an interrelation between the occurrence of earthquakes and local disturbances in the geomagnetic field that could translate into an influence on the local cosmic ray flux at ground level. On April 16, 2016, Ecuador suffered one of the strongest earthquakes in its history. One of the Latin American Giant Observatory (LAGO) water Cherenkov...

The present work exposes the Monad Formalism, which allows to characterize the frames of reference by tensor magnitudes, called physical-geometric tensors, and their relations with the metric tensor of space-time in the General Theory of Relativity (GTR). The invariances of the Monad Formalism are analyzed and the 3 + 1 foliation of the space-time is developed, which allows the Hamiltonian...

In this work we study the contributions to the Dark Matter indirect detection which arising from additional neutral scalar and neutral gauge vector boson. The Dark Matter candidate is assumed to be an extra singlet scalar field. We find interesting scenarios for the additional contributions to the Dark Matter indirect observation.

The study of LFV decays of the Higgs boson, $h\to \ell_i \ell_j$, has become an active research subject both from the experimental and theoretical points of view. Such decays vanish within the SM and are highly suppressed in several theoretical extensions. Due to its relevance and relative simplicity to reconstruct the signal at future colliders, it is an important tool to probe SM...

We study magnetic field and temperature effects on the Equations of State (EoS) and the structure of a compact object composed by a gas of interacting spin one bosons formed up by the pairing of two neutrons. We have considered independently that particle-magnetic field and particle-particle interactions. The magnetic field provokes anisotropic equation of the state so it is not valid any more...

The aim of this work was to obtain new analitical solutions for Einstein equations in the anisotropical domain. This was done via the minimal geometric deformation (MGD) approach, which is a simple and systematical method that allow us to decouple the Einstein equations. It requires a perfect fluid known solution that we will choose to be Finch-Skeas(FS) solution. Two different constraints...

**Abstract**

In [1,2], the influence of the cosmological constant in the propagation and measurement of Gravitational Waves (GW) was analyzed. In [3], a similar influence produced by non-relativistic matter was obtained. Thus, in this work we have generalized the effect for the case of an arbitrary perfect fluid, with equation of state $p=\omega_i \rho$, as the Universe background and used...

The production and efficient detection of photons in the ATLAS detector, plays an important role in the different analysis that takes place in the collaboration. Including both studies of the SM process and searches for new physics.

For the photon detection is essential a trigger system that allows a proper signal event selection, and also works for calibration, efficiency and identification...

The present work is focused on the implementation of path integral formalism for the calculation of entanglement entropy (EE) in quantum field theories (QFT's). First we introduce the alternative definition of EE, $S(A)$, in terms of R\'enyi entropy, $S_n (A)$. Then, we implement the reduced density matrix $\rho_{A}$ as an euclidean path integral. Inmediately after that, we consider the case...

Models beyond the standard model with extra scalars have been highly motived by the discobery of the Higgs boson. The two Higgs doublet model type III considers the most general case for the scalar potential, allowing mixing between neutral CP-even and CP-odd scalars fields. This work presents the results of the study on the t -> c gamma, t -> c Z, and t -> c h_1 decays, where h_1 is the...

We present a study connecting ultra-high energy cosmic rays (UHECR) events with gamma-ray astrophysical sources. We use UHECR data with energies greater than 80 EeV detected by the Pierre Auger Observatory and the Telescope Array. UHECR from extragalactic sources are likely made by protons and also light nuclei, as helium, and heavier nuclei. We consider several random mass compositions based...

In this poster I will present the simulation of a signal that could be found in the High Luminosity Large Hadron Collider. The signal represents a candidate for dark matter (DM) , based on models with extra partciles from the known standard model particles, an extra vector-like fermion doublet and a scalar DM candidate. The signal is thought to be consistent with photon excesses coming from...

Water Cherenkov Detectors (WCDs) are widely used for the study of the secondary cosmic rays flux at ground level and other high energy particles. Their performance is based on the emission of Cherenkov radiation in the active volume of the detector. This kind of radiation is emmited whenever a charged particle travels faster than the speed of light inside the medium. LAGO (Latin

American Giant...

Gamma spectrometry (γ) is used to detect photons with different energies, which characterize the different elements of radioactive samples. For this process there are several types of detectors applied to various types of sources. The present study focuses on obtaining a geometric efficiency calibration software, which will be used to introduce experimental characteristics, such as source...

Exact unbroken supersymmetry implies that particles and their superpartners would have the same mass and therefore it should be able to recreate them in high energy particle accelerators. However, the lack of evidence for the existence of this superpartners suggests that if nature is, in fact, supersymmetric it must be spontaneously broken so the superpartners become much heavier than their...

An extension of the Standard Model of elementary particles (SM) is studied to explain the mass hierarchy of fermions. This extension is based on the assumption of a new non-universal abelian U (1) 'interaction, which introduces extra fermions for the cancellation of chiral anomalies. As a consequence, an extended scalar sector is necessary to use, which consists of three doublets and one Higgs...