147 citations · 935 across the 36 of their papers we have counts for
21 papers · 1 filter
Quantizing non-projectable Hořava gravity with Lagrangian path integral
D. Blas, F. Del Porro, M. Herrero-Valea +2
We formulate the quantum version of non-projectable Hořava gravity as a Lagrangian theory with a path integral in the configuration space with an ultra-local in time, but non-local…
UV graviton scattering and positivity bounds from IR dispersion relations
M. Herrero-Valea, A. S. Koshelev, A. Tokareva
Scattering amplitudes mediated by graviton exchange display IR singularities in the forward limit. This obstructs standard application of positivity bounds based on twice subtracte…
Massless Positivity in Graviton Exchange
Mario Herrero-Valea, Raquel Santos-Garcia, Anna Tokareva
We formulate Positivity Bounds for scattering amplitudes including exchange of massless particles. We generalize the standard construction through dispersion relations to include t…
A Path (Integral) to Scale Invariance
Mario Herrero-Valea
We propose a path integral formulation for scale invariant quantum field theories. We do it by modifying the functional integration measure in such a way that the partition functio…
Non-minimal Tinges of Unimodular Gravity
Mario Herrero-Valea, Raquel Santos-Garcia
Unimodular Gravity is normally assumed to be equivalent to General Relativity for all matters but the character of the Cosmological Constant. Here we discuss this equivalence in th…
Towards the renormalization group flow of Horava gravity in dimensions
Andrei O. Barvinsky, Mario Herrero-Valea, Sergey M. Sibiryakov
We compute the renormalization group running of the Newton constant and the parameter in -dimensional projectable Horava gravity. We use the background field method expa…
Frame (In)equivalence in Quantum Field Theory and Cosmology
Kevin Falls, Mario Herrero-Valea
We revisit the question of frame equivalence in Quantum Field Theory in the presence of gravity, a situation of relevance for theories aiming to describe the early Universe dynamic…
What do gravitons say about (unimodular) gravity?
Mario Herrero-Valea
We revisit the problem of constraining the weak field limit of the gravitational lagrangian from S-matrix properties. From unitarity and Lorentz invariance of the S-matrix of massl…
Hořava gravity is asymptotically free (in 2+1 dimensions)
Andrei O. Barvinsky, Diego Blas, Mario Herrero-Valea +2
We compute the -functions of marginal couplings in projectable Hořava gravity in spacetime dimensions. We show that the renormalization group flow has an asymptotically-fr…
Renormalization of gauge theories in the background-field approach
Andrei O. Barvinsky, Diego Blas, Mario Herrero-Valea +2
Using the background-field method we demonstrate the Becchi-Rouet-Stora-Tyutin (BRST) structure of counterterms in a broad class of gauge theories. Put simply, we show that gauge i…
Heat kernel methods for Lifshitz theories
Andrei O. Barvinsky, Diego Blas, Mario Herrero-Valea +3
We study the one-loop covariant effective action of Lifshitz theories using the heat kernel technique. The characteristic feature of Lifshitz theories is an anisotropic scaling bet…
Anomalies, equivalence and renormalization of cosmological frames
Mario Herrero-Valea
We study the question of whether two frames of a given physical theory are equivalent or not in the presence of quantum corrections. By using field theory arguments we claim that e…
Renormalization of Horava Gravity
Andrei O. Barvinsky, Diego Blas, Mario Herrero-Valea +2
We prove perturbative renormalizability of projectable Horava gravity. The key element of the argument is the choice of a gauge which ensures the correct anisotropic scaling of the…
Unimodular Gravity Redux
E. Álvarez, S. González-Martín, M. Herrero-Valea +1
It is well known that the problem of the cosmological constant appears in a new light in Unimodular Gravity. In particular, the zero momentum piece of the potential does not automa…
Quantum Corrections to Unimodular Gravity
Enrique Álvarez, Sergio González-Martín, Mario Herrero-Valea +1
The problem of the cosmological constant appears in a new light in Unimodular Gravity. In particular, the zero momentum piece of the potential (that is, the constant piece independ…
Some Cosmological Consequences of Weyl Invariance
Enrique Álvarez, Sergio González-Martin, Mario Herrero-Valea
We examine some Weyl invariant cosmological models in the framework of generalized dilaton gravity, in which the action is made of a set of conformally coupled scalar fields. I…
Conformal and non Conformal Dilaton Gravity
Enrique Alvarez, Mario Herrero-Valea, Míriam Herrero-Valea +1
The quantum dynamics of the gravitational field non-minimally coupled to an (also dynamical) scalar field is studied in the {\em broken phase}. For a particular value of the coupli…
Some Comments on Dilaton Gravity
Enrique Alvarez, Mario Herrero-Valea, Míriam Herrero-Valea
A Weyl invariant extension of Einstein gravity is studied. It simply consists in the group averaging of Einstein's action under Weyl transformations. Contradicting cherished belief…
Unimodular Cosmological Space-times
Enrique Alvarez, Mario Herrero-Valea, Míriam Herrero-Valea
Some cosmological solutions of the unimodular theory of gravity are studied. These solutions can always be mapped to solutions of Einstein's general relativity in an appropiate fra…
No Conformal Anomaly in Unimodular Gravity
Enrique Álvarez, Mario Herrero-Valea, Míriam Herrero-Valea
The conformal invariance of unimodular gravity survives quantum corrections, even in the presence of conformal matter. Unimodular gravity can actually be understood as a certain tr…
Unimodular gravity with external sources
Enrique Álvarez, Mario Herrero-Valea, Míriam Herrero-Valea
The only allowed source of the gravitational field in the unimodular theory, invariant under area-preserving (transverse) diffeomorphisms as well as Weyl transformations, is just t…