147 citations · 935 across the 36 of their papers we have counts for
37 papers
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…
Superradiant scattering in Lorentz-violating gravity
M. Herrero-Valea, E. Simon-Felix
Black holes in Lorentz violating gravity enjoy a double horizon structure which resembles that of the Kerr solution in General Relativity. Moreover, when a scalar field with a modi…
Deep Learning solutions to singular ordinary differential equations: from special functions to spherical accretion
R. Cayuso, M. Herrero-Valea, E. Barausse
Singular regular points often arise in differential equations describing physical phenomena such as fluid dynamics, electromagnetism, and gravitation. Traditional numerical techniq…
Rescuing the Unruh Effect in Lorentz Violating Gravity
F. Del Porro, M. Herrero-Valea, S. Liberati +1
While the robustness of Hawking radiation in the presence of UV Lorentz breaking is well-established, the Unruh effect has posed a challenge, with a large literature concluding tha…
Hawking Radiation in Lorentz Violating Gravity: A Tale of Two Horizons
F. Del Porro, M. Herrero-Valea, S. Liberati +1
Since their proposal, Lorentz violating theories of gravity have posed a potential threat to black hole thermodynamics, as superluminal signals appeared to be incompatible with the…
The Status of Horava Gravity
M. Herrero-Valea
Horava gravity is a proposal for a UV completion of gravitation obtained by endowing the space-time manifold with a preferred foliation in space-like hypersurfaces. This allows for…
Well-posed evolution of field theories with anisotropic scaling: the Lifshitz scalar field in a black hole space-time
Marcelo E. Rubio, Áron D. Kovács, M. Herrero-Valea +2
Partial differential equations exhibiting an anisotropic scaling between space and time -- such as those of Horava-Lifshitz gravity -- have a dispersive nature. They contain higher…
On the Resilience of Black Hole Evaporation: Gravitational Tunneling through Universal Horizons
M. Schneider, F. Del Porro, M. Herrero-Valea +1
Using a quantum tunneling derivation, we show the resilience of Hawking radiation in Lorentz violating gravity. In particular, we show that the standard derivation of the Hawking e…
Gravitational Tunneling in Lorentz Violating Gravity
F. Del Porro, M. Herrero-Valea, S. Liberati +1
Black holes in Lorentz violating gravity, such as Einstein--Aether or Horava--Lifshitz Gravity, are drastically different from their general relativistic siblings. Although they al…
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…
Time Orientability and Particle Production from Universal Horizons
Francesco Del Porro, Mario Herrero-Valea, Stefano Liberati +1
We discuss particle production in spacetimes endowed with a universal horizon in Einstein--Aether and Horava gravity. We argue that continuity and differentiability of the lapse fu…
EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
R. Alves Batista, M. A. Amin, G. Barenboim +134
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the…
The shape of Scalar Gauss-Bonnet Gravity
Mario Herrero-Valea
We study the consistency of Scalar Gauss-Bonnet Gravity, a generalization of General Relativity where black holes can develop non-trivial hair by the action of a coupling $F(Φ){\ca…
New binary pulsar constraints on Einstein-æther theory after GW170817
Toral Gupta, Mario Herrero-Valea, Diego Blas +4
The timing of millisecond pulsars has long been used as an exquisitely precise tool for testing the building blocks of general relativity, including the strong equivalence principl…
The relation between general relativity and a class of Hořava gravity theories
Nicola Franchini, Mario Herrero-Valea, Enrico Barausse
Violations of Lorentz (and specifically boost) invariance can make gravity renormalizable in the ultraviolet, as initially noted by Hořava, but are increasingly constrained in the…
Black Holes in Ultraviolet-Complete Horava Gravity
Guillermo Lara, Mario Herrero-Valea, Enrico Barausse +1
Horava gravity is a proposal for completing general relativity in the ultraviolet by interactions that violate Lorentz invariance at very high energies. We focus on (2+1)-dimension…
Hawking Radiation from Universal Horizons
Mario Herrero-Valea, Stefano Liberati, Raquel Santos-Garcia
The persistence of a suitable notion of black hole thermodynamics in Lorentz breaking theories of gravity is not only a non-trivial consistency test for such theories, it is also a…
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…
To Positivity and Beyond, where Higgs-Dilaton Inflation has never gone before
Mario Herrero-Valea, Inar Timiryasov, Anna Tokareva
We study the consequences of (beyond) positivity of scattering amplitudes in the effective field theory description of the Higgs-Dilaton inflationary model. By requiring the EFT to…
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…