378 citations · 1.4k across the 36 of their papers we have counts for
32 papers · 1 filter
The cosmological constant is probably still zero
Yang Liu, Antonio Padilla, Francisco G. Pedro
We consider a wide class of four-dimensional effective field theories in which gravity is coupled to multiple four-forms and their dual scalar fields, with membrane sources charged…
Early Dark Energy in Type IIB String Theory
Michele Cicoli, Matteo Licheri, Ratul Mahanta +3
Early Dark Energy (EDE) is a promising model to resolve the Hubble Tension, that, informed by Cosmic Microwave Background data, features a generalization of the potential energy us…
Stringy multifield quintessence and the Swampland
Max Brinkmann, Michele Cicoli, Giuseppe Dibitetto +1
We consider quintessence models within 4D effective descriptions of gravity coupled to two scalar fields. These theories are known to give rise to viable models of late-time cosmic…
Secondary GWs and PBHs in string inflation: formation and detectability
Michele Cicoli, Francisco G. Pedro, Nicola Pedron
We derive the spectrum and analyse the detectability prospects of secondary gravity waves (GWs) associated to primordial black hole (PBH) production in a class of string inflationa…
Environmental selection of the cosmological constant and electroweak scales
Matteo Moretti, Francisco Gil Pedro
We investigate whether selfish/Goldilocks Higgs models can be extended to accomodate vacua with both the right Higgs mass and cosmological constant. Through the introduction of mul…
Quintessence and the Swampland: The numerically controlled regime of moduli space
Michele Cicoli, Francesc Cunillera, Antonio Padilla +1
We provide a detailed discussion of the main theoretical and phenomenological challenges of quintessence model building in any numerically controlled regime of the moduli space of…
A Fake Instability in String Inflation
Michele Cicoli, Veronica Guidetti, Francesco Muia +2
In type IIB Fibre Inflation models the inflaton is a Kaehler modulus which is kinetically coupled to the corresponding axion. In this setup the curvature of the field space induces…
Out of the Swampland with Multifield Quintessence?
Michele Cicoli, Giuseppe Dibitetto, Francisco G. Pedro
Multifield models with a curved field space have already been shown to be able to provide viable quintessence models for steep potentials that satisfy swampland bounds. The simples…
Flattened Axion Monodromy Beyond Two Derivatives
Francisco G. Pedro, Alexander Westphal
We study string inspired two-field models of large-field inflation based on axion monodromy in the presence of an interacting heavier modulus. This class of models has enough struc…
Geometrical Destabilisation of Ultra-Light Axions in String Inflation
Michele Cicoli, Veronica Guidetti, Francisco G. Pedro
We perform a detailed analytical and numerical analysis of the multi-field evolution of Fibre Inflation and show that, regardless of the microscopic realisation of the model, the m…
A geometrical instability for ultra-light fields during inflation?
Michele Cicoli, Veronica Guidetti, Francisco G. Pedro +1
Westudythebehaviourofisocurvatureperturbationsinnon-linearsigmamodels which naturally emerge in supergravity and string inflationary scenarios. We focus on the case of negatively c…
Primordial Black Holes from String Inflation
Michele Cicoli, Victor A. Diaz, Francisco G. Pedro
We present a single-field string inflationary model which allows for the generation of primordial black holes in the low mass region where they can account for a significant fracti…
UV physics and the speed of sound during inflation
Francisco G. Pedro
We consider inflation as an effective field theory and study the effects of the addition to the Lagrangian of irrelevant operators with higher powers of first derivatives on its dy…
Inflation in higher-dimensional Space-times
Santiago Pajón Otero, Francisco G. Pedro, Clemens Wieck
We generalise Starobinsky's model of inflation to space-times with dimensions, where dimensions are compactified on a suitable manifold. The -dimensional action feat…
Higgs-otic Inflation and Moduli Stabilization
Sjoerd Bielleman, Luis E. Ibanez, Francisco G. Pedro +2
We study closed-string moduli stabilization in Higgs-otic inflation in Type IIB orientifold backgrounds with fluxes. In this setup large-field inflation is driven by the vacuum ene…
Inflation with a graceful exit in a random landscape
Francisco G. Pedro, Alexander Westphal
We develop a stochastic description of small-field inflationary histories with a graceful exit in a random potential whose Hessian is a Gaussian random matrix as a model of the uns…
The DBI Action, Higher-derivative Supergravity, and Flattening Inflaton Potentials
Sjoerd Bielleman, Luis E. Ibanez, Francisco G. Pedro +2
In string theory compactifications it is common to find an effective Lagrangian for the scalar fields with a non-canonical kinetic term. We study the effective action of the scalar…
Starobinsky-Type Inflation from -Corrections
Benedict J. Broy, David Ciupke, Francisco G. Pedro +1
Working in the Large Volume Scenario (LVS) of IIB Calabi-Yau flux compactifications, we construct inflationary models from recently computed higher derivative -corrections.…
Multifield Dynamics in Higgs-otic Inflation
S. Bielleman, L. E. Ibanez, F. G. Pedro +1
In Higgs-otic inflation a complex neutral scalar combination of the and MSSM Higgs fields plays the role of inflaton in a chaotic fashion. The potential is protected fr…
Disentangling the - Duality
Benedict J. Broy, Francisco G. Pedro, Alexander Westphal
Motivated by UV realisations of Starobinsky-like inflation models, we study generic exponential plateau-like potentials to understand whether an exact -formulation may still…
Towards Natural Inflation in String Theory
Ido Ben-Dayan, Francisco G. Pedro, Alexander Westphal
We provide type IIB string embeddings of two axion variants of natural inflation. We use a combination of RR 2 form axions as the inflaton field and have its potential generated by…
Just enough inflation: power spectrum modifications at large scales
Michele Cicoli, Sean Downes, Bhaskar Dutta +2
We show that models of `just enough' inflation, where the slow-roll evolution lasted only e-foldings, feature modifications of the CMB power spectrum at large angular scale…
Hierarchical Axion Inflation
Ido Ben-Dayan, Francisco Gil Pedro, Alexander Westphal
We propose a new field theory mechanism for generating an effective trans-Planckian decay constant from sub-Planckian ones. Using the minimal two axions and a hierarchy between two…
Low-l CMB Power Loss in String Inflation
Francisco G. Pedro, Alexander Westphal
The lack of power on large scales (l < 40) might have been observed by the PLANCK satellite. We argue that this putative feature can be explained by a phase of fast roll at the ons…