Concept
Gauge covariant derivative
Publications associées (32)
On the Comparison of Gauge Freedom Handling in Optimization-Based Visual-Inertial State Estimation
It is well known that visual-inertial state estimation is possible up to a four degrees-of-freedom (DoF) transformation (rotation around gravity and translation), and the extra DoFs (“gauge freedom”) have to be handled properly. While different approaches ...
2018Large field excursions and approximate discrete symmetries from a clockwork axion
We present a renormalizable theory of scalars in which the low-energy effective theory contains a pseudo-Goldstone boson with a compact field space of 2 pi F and an approximate discrete shift symmetry Z(Q) with Q >> 1, yet the number of fields in the theor ...
Amer Physical Soc2016Chiral charge erasure via thermal fluctuations of magnetic helicity
We consider a relativistic plasma of fermions coupled to an Abelian gauge field and carrying a chiral charge asymmetry, which might arise in the early Universe through baryogenesis. It is known that on large length scales, lambda greater than or similar to ...
Iop Publishing Ltd2016Renormalization of Horava gravity
Sergey Sibiryakov, Diego Blas Temino, Mario Herrero Valea
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 propagators and their uniform falloff at large frequencies and momenta. Thi ...
Amer Physical Soc2016Gauge Invariance of Thermal Transport Coefficients
Aris Marcolongo, Loris Ercole, Paolo Umari
Thermal transport coefficients are independent of the specific microscopic expression for the energy density and current from which they can be derived through the Green-Kubo formula. We discuss this independence in terms of a kind of gauge invariance resu ...
Springer/Plenum Publishers2016Non-Abelian Gauge Fields in Photonic Cavities and Photonic Superfluids
We show that the TE-TM modes splitting and the structure anisotropy of a semiconductor microcavity combine into a non-Abelian gauge field for exciton-polaritons or cavity photons. The field texture can be tuned simply by rotating the sample and ranges cont ...
Amer Physical Soc2014(Re-)inventing the relativistic wheel: gravity, cosets, and spinning objects
Alexander Monin, Francesco Riva, Solomon G Shamsuddin Osman Endlich
Space-time symmetries are a crucial ingredient of any theoretical model in physics. Unlike internal symmetries, which may or may not be gauged and/or spontaneously broken, space-time symmetries do not admit any ambiguity: they are gauged by gravity, and an ...
Springer2014Simple metastable de Sitter vacua in N=2 gauged supergravity
Claudio Scrucca, Paul Smyth, Francesca Catino
We construct a simple class of N=2 gauged supergravity theories that admit metastable de Sitter vacua, generalizing the recent work done in the context of rigid supersymmetry. The setup involves one hypermultiplet and one vector multiplet spanning suitably ...
Springer2013Selection rules for helicity amplitudes in massive gauge theories
After a rediscussion of the vanishing theorems for helicity amplitudes in unbroken gauge theories, we study the case of spontaneously broken gauge theories at high energy. The vanishing theorems generalize to a definite pattern of m/E suppression of the am ...
Amer Physical Soc2013Electrically gauged N=4 supergravities in D=4 with N=2 vacua
We study N = 2 vacua in spontaneously broken N = 4 electrically gauged supergravities in four space-time dimensions. We argue that the classification of all such solutions amounts to solving a system of purely algebraic equations. We then explicitly constr ...
Springer2013