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Complete and continuously up-to-date lists of  my publications may be found on my profiles on the

following databases:

 

Also you can explore opportunities in my group:

Cosmology National Group at ICN

 

Research

Impact of H0​ priors on f(T) late time cosmology

We present a detailed analysis of the impact of H0 priors from recent surveys in the literature on the late time cosmology of five f(T) cosmological models using cosmic chronometers, the Pantheon data set, and baryonic acoustic oscillation data. We close with a cross-analysis of each of our model, data set and prior combination choices.

Teleparallel Gravity: From Theory to Cosmology

Briffa, R., Escamilla-Rivera C., Said Levi J., Mifsud J, and Pullicino, N.

arXiv:2108.03853

Teleparallel Gravity: From Theory to Cosmology

Teleparallel gravity has significantly increased in popularity in recent decades, bringing attention to Einstein's other theory of gravity. In this Review, we relate this form of geometry to the broader metric-affine approach to forming gravitational theories where we describe a systematic way of constructing consistent teleparallel theories that respect certain physical conditions We then discuss the cosmological consequences for the various formulations of teleparallel gravity.  And we examine works in observational and precision cosmology across the plethora of proposal theories. This is done using some of the latest observations and is used to tackle cosmological tensions which may be alleviated in teleparallel cosmology. We also introduce a number of recent works in the application of machine learning to gravity, we do this through deep learning and Gaussian processes, together with discussions about other approaches in the literature.

Teleparallel Gravity: From Theory to Cosmology

Bahamonde S, Dialektopoulos K, Escamilla-Rivera C., Farrugia G, Gakis V, Hendry M, Hohmann M, 

Said Levi J., Mifsud J, and Di Valentino, E.

arXiv:2106.13793

Cosmology Intertwined 2021: The Series Snowmass

The standard Λ Cold Dark Matter cosmological model provides an amazing description of a wide range of astrophysical and astronomical data. However, there are a few big open questions, that make the standard model look like a first-order approximation to a more realistic scenario that still needs to be fully understood. In series of Letters we will listed a few important goals that need to be addressed in the next decade, also taking into account the current discordances present between the different cosmological probes, as the Hubble constant H0​ value, the σ8-S8​ tension, and the anomalies present in the Planck results. 

Cosmology Intertwined I: Perspectives for the Next Decade

Cosmology Intertwined II: The Hubble Constant Tension

Cosmology Intertwined III: fσ8​ and S8​

Cosmology Intertwined IV: The Age of the Universe and its Curvature

E. Di Valentino, L. Anchordoqui, C. Escamilla-Rivera, A. Riess, et. al

arXiv:2008.11283

arXiv:2008.11284

arXiv:2008.11285 

arXiv:2008.11286 

 

Teleparallel Gravity from a precision cosmology perspective

 

In these series of  works we present a further investigation about teleparallel gravity cosmology. We demonstrate that according to the current astrophysical data (CC + Pantheon + BAO samplers with late Universe measurements SH0ES + H0LiCOW), an f(T, B) theory can provide another interpretation to the oscillatory behaviour of the dark energy equation of state when applied to late times. The four f(T, B) cosmological viable models proposed here can undergo an epoch of late-time acceleration and reproduce quintessence and phantom regimes with a transition along the phantom-divided line, making this theory a good approach to modify the standard ΛCDM model. Furthemore, we describe the treatment of our nonlinear autonomous system by studying the hyperbolic critical points and discuss an interesting phenomenological feature in regards to H0: the possibility to obtain a best-fit value for this parameter in a cosmologically viable f(T,B) model, a mixed power law. 

Cosmological viable models in f(T,B) theory as solutions to the H0​ tension

Escamilla-Rivera C.  and Said Levi J.

arXiv:1909.10328 

Stability analysis for cosmological models in f(T,B) gravity

Rave Franco G, Escamilla-Rivera C. and Said Levi J.

arXiv:2005.14191

Dynamical complexity of the teleparallel gravity cosmology

Rave Franco G, Escamilla-Rivera C. and Said Levi J.

arXiv:2101.06347

Gravitational wave siren data studies

On how cosmic acceleration could be the consequence of gravitational leakage into extra dimensions...

In theories that include additional non-compact spacetime dimensions, the gravitational leakage intro extra dimensions leads to a reduction in the amplitude of observed gravitational waves and thereby a systematic discrepancy between the distance inferred to such sources from GW and EM observations. We investigate the capability of a gravitational space interferometer such as LISA to probe this modified gravity on large scales. We find that the extent to which LISA will be able to place limits on the number of spacetime dimensions and other cosmological parameters characterising modified gravity will strongly depend on the actual number and redshift distribution of sources, together with the uncertainty on the GW measurements.  

Constraining extra dimensions on cosmological scales with LISA future gravitational wave siren data

Corman, M, Escamilla-Rivera C. and Hendry, M.

arXiv:2004.04009

 

 

 

 

Machine learning for dark energy

The first paper on deep learning dark energy in the literature...

The machine learning era is here! We propose a novel deep learning tool in order to study the evolution of dark energy models. The aim is to combine two architectures: the Recurrent Neural Networks (RNN) and the Bayesian Neural Networks (BNN), we named this full network as RNN+BNN .  For the trainings we use measurements of the distance modulus μ(z), such as those provided by Pantheon Supernovae Type Ia. Our results promise a step on how we can train a new neural network that can compute their own confidence regions for specific cosmological data. 


A deep learning approach to cosmological dark energy models

Escamilla-Rivera C., Carvajal, A. and Capozziello, S.

JCAP 2003 (2020)

arXiv:1910.02788

Inverse Cosmography: testing the effectiveness of cosmographic polynomials using machine learning

C. Zamora and Escamilla-Rivera C.

JCAP (2020) 007

arXiv:2005.02807

A better way to do cosmography 

A new cosmography point of view...

Since any attempt to constrain the EoS requires fixing some prior in one form or the other, settling a method to constrain cosmological parameters is of great importance. In this work, we provide a straightforward approach to show how cosmological tests can be improved via a parametric methodology based on cosmography. 

 

Unveiling cosmography from the dark energy equation of state 

Escamilla-Rivera C. and Capozziello, S.

International Journal of Modern Physics D 10.1142

 arXiv:1905.04602

Modified gravity for surveys

I present a new parameterization for a geometric equation of state (GEoS) which can reproduce a f(R)-like evolution. It was showed that our proposal can render a variety of models that are considered as viable candidates for the cosmic late time acceleration. Using observational

data from baryonic acoustic oscillations, supernovae and cosmic chronometers we investigate the constraints on dark energy parameters.

 

New parametrized equation of state for dark energy surveys.

Jaime L, Jaber M and Escamilla-Rivera C.

Phys. Rev. D 98, 083530

arXiv:1804.04284

Perturbations in dark energy models...

The majority of my work focuses in discuss observational aspects of time-dependent parameterisations of the dark energy equation of state w(z). In order to determine the dynamics associated with these models, I study the evolution and perturbations in a  scalar field representation. Performing a complete treatment of linear perturbations, we can show that the non-linear contribution of the selected w(z) parameterisations to the matter power spectra is almost the same for all scales, with no significant difference from the predictions of the standard LCDM model.

Linear and non-linear perturbations in dark energy models

Escamilla-Rivera, C; Casarini, L; Fabris, J and Alcaniz, J

JCAP 1611 (2016) no.11, 010

arXiv:1605.01475

Surrounded by Dark Energy...

Even Planck mission confirm in 2015  that we are 68.3% surrounded by Dark Energy (DE), the responsible of the accelerated expansion of the universe. Over the  years, many attemps were develop in this intriguing element: modifications to General Relativity (GR), a wide zoo of parameterizations of its

equation of state, etc. My goal in this subject is to study the cosmodynamics of DE and found a general model using only the astrophysical samples at hand.

This idea gave me the Europeus DPhil degree in February 2014 by University of Basque Country and University of Oxford with an outstading award.

Beyond Einstein Gravity... a step forward

In 2010 an elegant theory was proposed by Pedro Ferreira and Max BanadosEddington inspired Born-Infeld, which present a non-singular behaviour of the universe. One year after the publication of this idea, I had the honor to work with the dads of this theory and the result was: A tensor instability in the Eddington inspired Born-Infeld Theory of Gravity, and until this date, my paper with more citations.

A tensor instability in the Eddington inspired Born-Infeld Theory of Gravity 

Escamilla-Rivera C, Bañados M and Ferreira P.

Phys.Rev. D85 (2012) 087302

arXiv:1204.1691

Fluctuations of gravitational waves in Eddington inspired Born-Infeld theory 

Escamilla-Rivera C.

arXiv:1803.02779

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