Joanes Lizarraga

Joanes Lizarraga
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Joanes Lizarraga

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Cosmology and Nongalactic Astrophysics (9)
High Energy Physics - Theory (8)
High Energy Physics - Phenomenology (5)
General Relativity and Quantum Cosmology (1)

Publications Authored By Joanes Lizarraga

We investigate cosmic string networks in the Abelian Higgs model using data from a campaign of large-scale numerical simulations on lattices of up to $4096^3$ grid points. We observe scaling or self-similarity of the networks over a wide range of scales, and estimate the asymptotic values of the mean string separation in horizon length units $\dot{\xi}$ and of the mean square string velocity $\bar v^2$ in the continuum and large time limits. The scaling occurs because the strings lose energy into classical radiation of the scalar and gauge fields of the Abelian Higgs model. Read More

Authors: CORE Collaboration, Fabio Finelli, Martin Bucher, Ana Achúcarro, Mario Ballardini, Nicola Bartolo, Daniel Baumann, Sébastien Clesse, Josquin Errard, Will Handley, Mark Hindmarsh, Kimmo Kiiveri, Martin Kunz, Anthony Lasenby, Michele Liguori, Daniela Paoletti, Christophe Ringeval, Jussi Väliviita, Bartjan van Tent, Vincent Vennin, Frederico Arroja, Marc Ashdown, A. J. Banday, Ranajoy Banerji, Jochem Baselmans, James G. Bartlett, Paolo de Bernardis, Marco Bersanelli, Anna Bonaldi, Julian Borril, François R. Bouchet, François Boulanger, Thejs Brinckmann, Zhen-Yi Cai, Martino Calvo, Anthony Challinor, Jens Chluba, Guido D'Amico, Jacques Delabrouille, José María Diego, Gianfranco De Zotti, Vincent Desjacques, Eleonora Di Valentino, Stephen Feeney, James R. Fergusson, Simone Ferraro, Francesco Forastieri, Silvia Galli, Juan García-Bellido, Ricardo T. Génova-Santos, Martina Gerbino, Joaquin González-Nuevo, Sebastian Grandis, Josh Greenslade, Steffen Hagstotz, Shaul Hanany, Dhiraj K. Hazra, Carlos Hernández-Monteagudo, Eric Hivon, Bin Hu, Ely D. Kovetz, Hannu Kurki-Suonio, Massimiliano Lattanzi, Julien Lesgourgues, Joanes Lizarraga, Marcos López-Caniego, Gemma Luzzi, Bruno Maffei, Carlos J. A. P. Martins, Enrique Martínez-González, Darragh McCarthy, Sabino Matarrese, Alessandro Melchiorri, Jean-Baptiste Melin, Alessandro Monfardini, Paolo Natoli, Mattia Negrello, Filippo Oppizzi, Enrico Pajer, Subodh P. Patil, Michael Piat, Giampaolo Pisano, Vivian Poulin, Andrea Ravenni, Mathieu Remazeilles, Alessandro Renzi, Diederik Roest, Laura Salvati, Andrea Tartari, Gianmassimo Tasinato, Jesús Torrado, Neil Trappe, Marco Tucci, Jon Urrestilla, Patricio Vielva, Rien Van de Weygaert

We forecast the scientific capabilities of CORE, a proposed CMB space satellite submitted in response to the ESA fifth call for a medium-size mission opportunity, to improve our understanding of cosmic inflation. The CORE mission will map the CMB anisotropies in temperature and polarization in 19 frequency channels spanning the range 60-600 GHz. CORE will have an aggregate noise sensitivity of $1. Read More

We present cosmic microwave background (CMB) power spectra from recent numerical simulations of cosmic strings in the Abelian Higgs model and compare them to CMB power spectra measured by Planck. We obtain revised constraints on the cosmic string tension parameter $G\mu$. For example, in the $\Lambda$CDM model with the addition of strings and no primordial tensor perturbations, we find $G\mu < 2. Read More

We perform large-scale field theoretical simulations in expanding universe to characterize a network of strings that can form composed bound states. The network consists of two copies of Abelian Higgs strings (which we label p and q, respectively) coupled via a potential term to give pq bound states. The simulations are performed using two different kinds of initial conditions: the first one with a network of p- and q-strings, and the second one with a network of q- and pq-strings. Read More

We report on the energy-momentum correlators obtained with recent numerical simulations of the Abelian Higgs model, essential for the computation of cosmic microwave background and matter perturbations of cosmic strings. Due to significant improvements both in raw computing power and in our parallel simulation framework, the dynamical range of the simulations has increased four-fold both in space and time, and for the first time we are able to simulate strings with a constant physical width in both the radiation and matter eras. The new simulations improve the accuracy of the measurements of the correlation functions at the horizon scale and confirm the shape around the peak. Read More

In this work we discuss the possibility of cosmic defects being responsible for the B-mode signal measured by the BICEP2 collaboration. We also allow for the presence of other cosmological sources of B-modes such as inflationary gravitational waves and polarized dust foregrounds, which might contribute to or dominate the signal. On the one hand, we find that defects alone give a poor fit to the data points. Read More

We analyse the possible contribution of topological defects to cosmic microwave anisotropies, both temperature and polarisation. We allow for the presence of both inflationary scalars and tensors, and of polarised dust foregrounds that may contribute to or dominate the B-mode polarisation signal. We confirm and quantify our previous statements that topological defects on their own are a poor fit to the B-mode signal. Read More

We show that the B-mode polarization signal detected at low multipoles by BICEP2 cannot be entirely due to topological defects. This would be incompatible with the high-multipole B-mode polarization data and also with existing temperature anisotropy data. Adding cosmic strings to a model with tensors, we find that B-modes on their own provide a comparable limit on the defects to that already coming from Planck satellite temperature data. Read More

The recent observation that the Cosmic Microwave Background (CMB) may prefer a neutrino excess has triggered a number of works studying this possibility. The effect obtained by the non-interacting massless neutrino excess could be mimicked by some extra radiation component in the early universe, such as a cosmological gravitational wave background. Prompted by the fact that a possible candidate to source those gravitational waves would be cosmic strings, we perform a parameter fitting study with models which considers both cosmic strings and the effective number of neutrinos as free parameters, using CMB and non-CMB data. Read More