4.2k citations · 8.2k across the 74 of their papers we have counts for
61 papers · 1 filter
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…
Quintessence and the Swampland: The parametrically controlled regime of moduli space
Michele Cicoli, Francesc Cunillera, Antonio Padilla +1
We provide evidence that slow roll is not possible in any parametrically controlled regime of the moduli space of string theory. This is proven in full generality in the asymptotic…
Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua
Francesc Cunillera, William T. Emond, Antoine Lehébel +1
We investigate the combined effect of fluxes and higher-order curvature corrections, in the form of the Gauss-Bonnet term, on the existence of de Sitter vacua in a heterotic string…
A stringy perspective on the coincidence problem
Francesc Cunillera, Antonio Padilla
We argue that, for generic string compactifications, dark energy is likely to signal the beginning of the end of our universe, perhaps even through decompactification, with possibl…
Unimodular vs Nilpotent Superfield Approach to Pure dS Supergravity
Sukruti Bansal, Silvia Nagy, Antonio Padilla +1
Recent progress in understanding de Sitter spacetime in supergravity and string theory has led to the development of a four dimensional supergravity with spontaneously broken super…
Deconstructing higher order clockwork gravity
Anastasios Avgoustidis, Florian Niedermann, Antonio Padilla +1
We consider the higher order clockwork theory of gravitational interactions, whereby a number of gravitons are coupled together with TeV strength, but nevertheless generate a Planc…
Massive Galileons and Vainshtein Screening
Clare Burrage, Ben Coltman, Antonio Padilla +2
The Vainshtein screening mechanism relies on nonlinear interaction terms becoming dominant close to a compact source. However, theories displaying this mechanism are generally unde…
A natural theory of dark energy
Lorenzo Bordin, Francesc Cunillera, Antoine Lehébel +1
We propose a mechanism that generates a naturally light dark energy field (with Hubble scale mass), starting from a theory with exclusively high scale (Planckian) couplings. It is…
The Super-Stuckelberg procedure and dS in Pure Supergravity
Silvia Nagy, Antonio Padilla, Ivonne Zavala
Understanding de Sitter space in supergravity - and string theory - has lead to an intense amount of work for more than two decades, largely motivated by the discovery of the accel…
Quantum corrections to vacuum energy sequestering (with monodromy)
Basem Kamal El-Menoufi, Silvia Nagy, Florian Niedermann +1
Field theory models of axion monodromy have been shown to exhibit vacuum energy sequestering as an emergent phenomenon for cancelling radiative corrections to the cosmological cons…
Cosmological consequences of Omnia Sequestra
Ben Coltman, Yixuan Li, Antonio Padilla
Vacuum energy sequestering is a mechanism for cancelling off the radiative corrections to vacuum energy. The most comprehensive low energy model, proposed in 1606.04958 [hep-th], h…
Monodromy inflation and an emergent mechanism for stabilising the cosmological constant
Antonio Padilla
We show that a pair of field theory monodromies in which the shift symmetry is broken by small, well motivated deformations, naturally incorporates a mechanism for cancelling off r…
Higher Order Clockwork Gravity
Florian Niedermann, Antonio Padilla, Paul M. Saffin
We present a higher order generalisation of the clockwork mechanism starting from an underlying non-linear multigravity theory with a single scale and nearest neighbour ghost-free…
Vainshtein in the UV and a Wilsonian analysis of derivatively coupled scalars
Antonio Padilla, Ippocratis D. Saltas
In the first part of this paper we critically examine the ultra-violet implications of theories that exhibit Vainshtein screening, taking into account both the standard Wilsonian p…
Non-perturbative aspects of galileon duality
Peter Millington, Florian Niedermann, Antonio Padilla
We study quantum aspects of the galileon duality, especially in the case of a particular interacting galileon theory that is said to be dual to a free theory through the action of…
Gravitational Mechanisms to Self-Tune the Cosmological Constant: Obstructions and Ways Forward
Florian Niedermann, Antonio Padilla
Gravitational models of self-tuning are those in which vacuum energy has no observable effect on spacetime curvature, even though it is a priori unsuppressed below the cut-off. We…
An Etude on Global Vacuum Energy Sequester
Guido D'Amico, Nemanja Kaloper, Antonio Padilla +3
Recently two of the authors proposed a mechanism of vacuum energy sequester as a means of protecting the observable cosmological constant from quantum radiative corrections. The or…
Probing Scalar Effective Field Theories with the Soft Limits of Scattering Amplitudes
Antonio Padilla, David Stefanyszyn, Toby Wilson
We investigate the soft behaviour of scalar effective field theories (EFTs) when there is a number of distinct derivative power counting parameters, . We cla…
Vacuum Energy Sequestering and Graviton Loops
Nemanja Kaloper, Antonio Padilla
We recently formulated a local mechanism of vacuum energy sequester. This mechanism automatically removes all matter loop contributions to vacuum energy from the stress energy tens…
Sequestering effects on and of vacuum decay
Nemanja Kaloper, Antonio Padilla, David Stefanyszyn
We consider phase transitions and their contributions to vacuum energy in the manifestly local theory of vacuum energy sequestering. We demonstrate that the absence of instabilitie…
How to Avoid a Swift Kick in the Chameleons
Antonio Padilla, Emma Platts, David Stefanyszyn +3
Recently it was argued that the conformal coupling of the chameleon to matter fields created an issue for early universe cosmology. As standard model degrees of freedom become non-…
A Manifestly Local Theory of Vacuum Energy Sequestering
Nemanja Kaloper, Antonio Padilla, David Stefanyszyn +1
We present a manifestly local, diffeomorphism invariant and locally Poincare invariant formulation of vacuum energy sequestering. In this theory, quantum vacuum energy generated by…
Lectures on the Cosmological Constant Problem
Antonio Padilla
These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, empha…
Unitarity and the Vainshtein Mechanism
Nemanja Kaloper, Antonio Padilla, Paul Saffin +1
We investigate low energy limits of massive gauge theories that feature the Vainshtein mechanism, focussing on the effects of the UV modes that are integrated out. It turns out tha…