26 citations · 53 across the 15 of their papers we have counts for
16 papers
Sphere path integrals for fermionic gauge fields
Chiara Baracco, Vasileios A. Letsios
We consider spin- complex, strictly massless fermionic gauge fields on the four-sphere, , which is the Euclidean continuation of de Sitter spacetime, dS$_4…
A discrete series gauge field at the late-time boundary of
Manizheh Botshekananfard, Elif Büşra Güraksın, Vasileios A. Letsios +1
We study the free Maxwell field on the planar patch of four-dimensional de Sitter spacetime (). We review its bulk canonical quantization in the Bunch-Davies vacuum, and we g…
Axions on de Sitter space
Vasileios A. Letsios, Stathis Vitouladitis
We study a massless minimally coupled compact scalar, or axion, on global -dimensional de Sitter space (dS). We quantise the theory canonically, determine the quantum dS cha…
dS Metamorphosis
Dionysios Anninos, Chiara Baracco, Vasileios A. Letsios +1
We study the Euclidean path integral of higher spin gravity on . Based on a one-loop analysis, we are led to a gluing formula expressing the path integral in terms of an…
The complete action for de Sitter pure supergravity
Nicolas Boulanger, Vasileios A. Letsios, Sylvain Thomée
Supergravity theories in de Sitter spacetime are known to be very constrained, and rather unnatural within String/M Theory. We revisit the seminal paper by Pilch, van Nieuwenhuizen…
Unitary SUSY for the chiral graviton and chiral gravitino in de Sitter spacetime
Atsushi Higuchi, Vasileios A. Letsios
It is commonly believed that a unitary supersymmetric quantum field theory (QFT) involving graviton and gravitino fields on fixed 4-dimensional de Sitter spacetime () cannot…
Fermionic fields of higher spin in de Sitter space
Dionysios Anninos, Chiara Baracco, Vasileios A. Letsios +1
We consider fermionic fields of higher spin on a four-dimensional de Sitter background. A particular emphasis is placed on the Rarita-Schwinger spin- case. Both massi…
Unitary Rigid Supersymmetry for the Chiral Graviton and Chiral Gravitino in de Sitter Spacetime
Atsushi Higuchi, Vasileios A. Letsios
It is commonly believed that a unitary supersymmetric quantum field theory (QFT) involving graviton and gravitino fields on fixed 4-dimensional de Sitter spacetime () canno…
Quite Discrete for a fermion
Vasileios A. Letsios, Ben Pethybridge, Alan Rios Fukelman
We study Discrete Series representations of with half-integer scaling dimension . At the classical level, we show that these UIRs are realised in the space of…
Spinning fields on S and dS, UIRs and Ladder operators
Vasileios A. Letsios, Matías N. Sempé, Guillermo A. Silva
We construct, for spin tensor fields on S, a set of ladder operators that connect the distinct UIRs of SO. This is achieved by relying on the conformal Killing v…
Unconventional conformal invariance of maximal depth partially massless fields on and its relation to complex partially massless SUSY
Vasileios A. Letsios
Deser and Waldron have shown that maximal depth partially massless theories of higher integer spin on 4-dimensional de Sitter spacetime () possess infinitesimal symmetries…
New conformal-like symmetry of strictly massless fermions in four-dimensional de Sitter space
Vasileios A. Letsios
We present new infinitesimal `conformal-like' symmetries for the field equations of strictly massless spin- totally symmetric tensor-spinors (i.e. gauge potentials) on…
(Non-)unitarity of strictly and partially massless fermions on de Sitter space
Vasileios A. Letsios
We present the dictionary between the one-particle Hilbert spaces of totally symmetric tensor-spinor fields of spin with any mass parameter on -dimensional…
Conservation of all Lipkin's zilches from symmetries of the standard electromagnetic action and a hidden algebra
Vasileios A. Letsios
In 1964, Lipkin discovered the zilches, a set of conserved quantities in free electromagnetism. Among the zilches, optical chirality was identified by Tang and Cohen in 2010, servi…
(Non-)unitarity of strictly and partially massless fermions on de Sitter space II: an explanation based on the group-theoretic properties of the spin-3/2 and spin-5/2 eigenmodes
Vasileios A. Letsios
In our previous article [Letsios 2023 J. High Energ. Phys. JHEP05(2023)015], we showed that the strictly massless spin-3/2 field, as well as the strictly and partially massless spi…
The eigenmodes for spinor quantum field theory in global de Sitter space-time
Vasileios A. Letsios
The mode solutions of the Dirac equation on -dimensional de Sitter space-time () with -sphere spatial sections are obtained by analytically continuing the spinor…