Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Serra, Javi"'
We study how light scalar fields can change the stellar landscape by triggering a new phase of nuclear matter. Scalars coupled to nucleons can develop a non-trivial expectation value at finite baryon density. This sourcing of a scalar reduces the nuc
Externí odkaz:
http://arxiv.org/abs/2307.14418
We study the effects of exceptionally light QCD axions on the stellar configuration of white dwarfs. At finite baryon density, the non-derivative coupling of the axion to nucleons displaces the axion from its in-vacuum minimum which implies a reducti
Externí odkaz:
http://arxiv.org/abs/2211.02661
We derive causality constraints on the simplest scalar-tensor theories in which black holes differ from what General Relativity predicts, a scalar coupled to the Gauss-Bonnet or the Chern-Simons terms. Demanding that time advances are unobservable wi
Externí odkaz:
http://arxiv.org/abs/2205.08551
We study the renormalization group of generic effective field theories that include gravity. We follow the on-shell amplitude approach, which provides a simple and efficient method to extract anomalous dimensions avoiding complications from gauge red
Externí odkaz:
http://arxiv.org/abs/2109.06191
Finite density effects can destabilize the metastable vacua in relaxion models. Focusing on stars as nucleation seeds, we derive the conditions that lead to the formation and runaway of a relaxion bubble of a lower energy minimum than in vacuum. The
Externí odkaz:
http://arxiv.org/abs/2106.11320
We consider matter density effects in theories with a false ground state. Large and dense systems, such as stars, can destabilize a metastable minimum and allow for the formation of bubbles of the true minimum. We derive the conditions under which th
Externí odkaz:
http://arxiv.org/abs/2105.13354
Publikováno v:
JHEP 02 (2021) 043
We study the phenomenology of a strongly-interacting top quark at future hadron and lepton colliders, showing that the characteristic four-top contact operators give rise to the most significant effects. We demonstrate the extraordinary potential of
Externí odkaz:
http://arxiv.org/abs/2010.05915
We show how the properties of the QCD axion change in systems at finite baryonic density, such as neutron stars. At nuclear saturation densities, where corrections can be reliably computed, we find a mild reduction of the axion mass and up to an orde
Externí odkaz:
http://arxiv.org/abs/2003.04903
We construct the general effective field theory of gravity coupled to the Standard Model of particle physics, which we name GRSMEFT. Our method allows the systematic derivation of a non-redundant set of operators of arbitrary dimension with generic f
Externí odkaz:
http://arxiv.org/abs/1908.08050
We present an exceptional twin-Higgs model with the minimal symmetry structure for an exact implementation of twin parity along with custodial symmetry. Twin particles are mirrors of the Standard Model yet they carry hypercharge, while the photon is
Externí odkaz:
http://arxiv.org/abs/1905.02203