635 citations · 5.4k across the 66 of their papers we have counts for
41 papers · 1 filter
Vacuum birefringence and the Schwinger effect in (3+1) de Sitter
Mariona Banyeres, Guillem Domènech, Jaume Garriga
In de Sitter space, the current induced by an electric field in vacuum is known to feature certain peculiarities, such as infrared hyperconductivity for light bosons in weak electr…
Consistency relations and conservation of in holographic inflation
Jaume Garriga, Yuko Urakawa
It is well known that, in single clock inflation, the curvature perturbation is constant in time on superhorizon scales. In the standard bulk description this follows quite sim…
Black holes and the multiverse
Jaume Garriga, Alexander Vilenkin, Jun Zhang
Vacuum bubbles may nucleate and expand during the inflationary epoch in the early universe. After inflation ends, the bubbles quickly dissipate their kinetic energy; they come to r…
formalism from superpotential and holography
Jaume Garriga, Yuko Urakawa, Filippo Vernizzi
We consider the superpotential formalism to describe the evolution of scalar fields during inflation, generalizing it to include the case with non-canonical kinetic terms. We provi…
Topological Defects from the Multiverse
Jun Zhang, Jose J. Blanco-Pillado, Jaume Garriga +1
Many theories of the early universe predict the existence of a multiverse where bubbles continuously nucleate giving rise to observers in their interior. In this paper, we point ou…
Multi-field inflation from holography
Jaume Garriga, Kostas Skenderis, Yuko Urakawa
We initiate the study of multi-field inflation using holography. Bulk light scalar fields correspond to nearly marginal operators in the boundary theory and the dual quantum field…
Holographic inflation and the conservation of
Jaume Garriga, Yuko Urakawa
In a holographic description of inflation, cosmological time evolution in the bulk is expected to correspond to the renomalization group (RG) flow in a dual boundary theory. Here,…
Schwinger effect in de Sitter space
Markus B. Fröb, Jaume Garriga, Sugumi Kanno +4
We consider Schwinger pair production in 1+1 dimensional de Sitter space, filled with a constant electric field . This can be thought of as a model for describing false vacuum d…
Rest frame of bubble nucleation
Jaume Garriga, Sugumi Kanno, Takahiro Tanaka
Vacuum bubbles nucleate at rest with a certain critical size and subsequently expand. But what selects the rest frame of nucleation? This question has been recently addressed in [1…
Inflation and deformation of conformal field theory
Jaume Garriga, Yuko Urakawa
It has recently been suggested that a strongly coupled phase of inflation may be described holographically in terms of a weakly coupled quantum field theory (QFT). Here, we explore…
Watchers of the multiverse
Jaume Garriga, Alexander Vilenkin
An unresolved question in inflationary cosmology is the assignment of probabilities to different types of events that can occur in the eternally inflating multiverse. We explore th…
Observer dependence of bubble nucleation and Schwinger pair production
Jaume Garriga, Sugumi Kanno, Misao Sasaki +2
Pair production in a constant electric field is closely analogous to bubble nucleation in a false vacuum. The classical trajectories of the pairs are Lorentz invariant, but it appe…
Minkowski vacua can be metastable
Jaume Garriga, Benjamin Shlaer, Alexander Vilenkin
We investigate the recent suggestion that a Minkowski vacuum is either absolutely stable, or it has a divergent decay rate and thus fails to have a locally Minkowski description. T…
Holographic description of vacuum bubbles
Jaume Garriga
We discuss a holographic description of vacuum bubbles, with possible implications for a consistent description of the multiverse. In particular, we elaborate on the recent observa…
Holographic multiverse and conformal invariance
Jaume Garriga, Alexander Vilenkin
We consider a holographic description of the inflationary multiverse, according to which the wave function of the universe is interpreted as the generating functional for a lower d…
Holographic Multiverse
J. Garriga, A. Vilenkin
We explore the idea that the dynamics of the inflationary multiverse is encoded in its future boundary, where it is described by a lower dimensional theory which is conformally inv…
Semiclassical Unimodular Gravity
Bartomeu Fiol, Jaume Garriga
Classically, unimodular gravity is known to be equivalent to General Relativity (GR), except for the fact that the effective cosmological constant has the status of an integrat…
Prediction and explanation in the multiverse
Jaume Garriga, Alexander Vilenkin
Probabilities in the multiverse can be calculated by assuming that we are typical representatives in a given reference class. But is this class well defined? What should be include…
Can infrared gravitons screen ?
Jaume Garriga, Takahiro Tanaka
It has been suggested that infrared gravitons in de Sitter space may lead to a secular screening of the effective cosmological constant. This seems to clash with the naive expectat…
Eternal inflation, bubble collisions, and the persistence of memory
Jaume Garriga, Alan H. Guth, Alexander Vilenkin
A ``bubble universe'' nucleating in an eternally inflating false vacuum will experience, in the course of its expansion, collisions with an infinite number of other bubbles. In an…
Transverse Fierz-Pauli symmetry
E. Alvarez, D. Blas, J. Garriga +1
We consider some flat space theories for spin 2 gravitons, with less invariance than full diffeomorphisms. For the massless case, classical stability and absence of ghosts require…
Non-perturbative materialization of ghosts
Roberto Emparan, Jaume Garriga
In theories with a hidden ghost sector that couples to visible matter through gravity only, empty space can decay into ghosts and ordinary matter by graviton exchange. Perturbative…
Probabilities in the inflationary multiverse
Jaume Garriga, Delia Schwartz-Perlov, Alexander Vilenkin +1
Inflationary cosmology leads to the picture of a "multiverse," involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes.…
Anthropic prediction for Lambda and the Q catastrophe
Jaume Garriga, Alexander Vilenkin
We discuss probability distributions for the cosmological constant Lambda and the amplitude of primordial density fluctuations Q in models where they both are anthropic variables.…