383 citations · 1k across the 15 of their papers we have counts for
15 papers
Bayesian reconstruction of the inflaton's speed of sound using CMB data
Guadalupe Cañas-Herrera, Jesús Torrado, Ana Achúcarro
We update the search for features, due to transient reductions in inflaton's speed of sound, in the Cosmic Microwave Background (CMB) angular power spectrum using Planck 2018 tempe…
Multi-field inflation and preheating in asymmetric -attractors
Oksana Iarygina, Evangelos I. Sfakianakis, Dong-Gang Wang +1
We analyze and compare the multi-field dynamics during inflation and preheating in symmetric and asymmetric models of -attractors, characterized by a hyperbolic field-space mani…
Shift-Symmetric Orbital Inflation: single field or multi-field?
Ana Achúcarro, Edmund J. Copeland, Oksana Iarygina +3
We present a new class of two-field inflationary attractor models, known as `shift-symmetric orbital inflation', whose behaviour is strongly multi-field but whose predictions are r…
Universality of multi-field -attractors
Ana Achúcarro, Renata Kallosh, Andrei Linde +2
We study a particular version of the theory of cosmological -attractors with , in which both the dilaton (inflaton) field and the axion field are light during inflation.…
Exploring Cosmic Origins with CORE: Survey requirements and mission design
J. Delabrouille, P. de Bernardis, F. R. Bouchet +200
Future observations of cosmic microwave background (CMB) polarisation have the potential to answer some of the most fundamental questions of modern physics and cosmology. In this p…
Exploring Cosmic Origins with CORE: The Instrument
P. de Bernardis, P. A. R. Ade, J. J. A. Baselmans +126
We describe a space-borne, multi-band, multi-beam polarimeter aiming at a precise and accurate measurement of the polarization of the Cosmic Microwave Background. The instrument is…
A new class of de Sitter vacua in String Theory Compactifications
Ana Achúcarro, Pablo Ortiz, Kepa Sousa
We revisit the stability of the complex structure moduli in the large volume regime of type-IIB flux compactifications. We argue that when the volume is not exponentially large, su…
Multiple Field Inflation and Signatures of Heavy Physics in the CMB
Ana Achúcarro, Yvette Welling
In this master thesis we study multi-field inflation and the UV sensitivity of certain models of inflation in supergravity. We first introduce inflation and its current observation…
Evolution of Semilocal String Networks: I. Large-scale Properties
A. Achúcarro, A. Avgoustidis, A. M. M. Leite +4
We report on a detailed numerical study of the evolution of semilocal string networks, based on the largest and most accurate field theory simulations of these objects to date. We…
Correlating features in the primordial spectra
Ana Achúcarro, Jinn-Ouk Gong, Gonzalo A. Palma +1
Heavy fields coupled to the inflaton reduce the speed of sound in the effective theory of the adiabatic mode each time the background inflationary trajectory deviates from a geodes…
Sgoldstino inflation
Ana Achúcarro, Sander Mooij, Pablo Ortiz +1
We discuss the possibility that inflation is driven by the sgoldstino, the superpartner of the goldstino. Unlike in generic supergravity scenarios, the sgoldstino decouples from al…
Decoupling limits in multi-sector supergravities
Ana Achúcarro, Sjoerd Hardeman, Johannes M. Oberreuter +2
Conventional approaches to cosmology in supergravity assume the existence of multiple sectors that only communicate gravitationally. In principle these sectors decouple in the limi…
Features of heavy physics in the CMB power spectrum
Ana Achúcarro, Jinn-Ouk Gong, Sjoerd Hardeman +2
The computation of the primordial power spectrum in multi-field inflation models requires us to correctly account for all relevant interactions between adiabatic and non-adiabatic…
Mass hierarchies and non-decoupling in multi-scalar field dynamics
Ana Achúcarro, Jinn-Ouk Gong, Sjoerd Hardeman +2
In this work we study the effects of field space curvature on scalar field perturbations around an arbitrary background field trajectory evolving in time. Non-trivial imprints of t…
On the formation of non-topological string networks
Ana Achúcarro, Julian Borrill, Andrew R. Liddle
We review recent simulations of the formation of a particular class of non-topological defects known as semilocal strings during a phase transition. Semilocal strings have properti…