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  • Journal article
    Alberte L, de Rham C, Jaitly S, Tolley AJet al., 2022,

    Reverse Bootstrapping: IR Lessons for UV Physics

    , PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
  • Journal article
    Arvanitakis AS, Hohm O, Hull C, Lekeu Vet al., 2022,

    Homotopy transfer and effective field theory II: strings and double field theory

    , Fortschritte Der Physik/Progress of Physics, Vol: 70, Pages: 1-26, ISSN: 0015-8208

    We continue our study of effective field theory via homotopy transfer ofL∞-algebras, and apply it to tree-level non-Wilsonian effective actions of thekind discussed by Sen in which the modes integrated out are comparable inmass to the modes that are kept. We focus on the construction of effectiveactions for string states at fixed levels and in particular on the construction ofweakly constrained double field theory. With these examples in mind, wediscuss closed string theory on toroidal backgrounds and resolve some subtleissues involving vertex operators, including the proper form of cocycle factorsand of the reflector state. This resolves outstanding issues concerning theconstruction of covariant closed string field theory on toroidal backgrounds.The weakly constrained double field theory is formally obtained from closedstring field theory on a toroidal background by integrating out all but the‘doubly massless’ states and homotopy transfer then gives a prescription fordetermining the theory’s vertices and symmetries. We also discuss consistenttruncation in the context of homotopy transfer.
  • Journal article
    Acharya B, Alexandre J, Benes P, Bergmann B, Bertolucci S, Bevan A, Branzas H, Burian P, Campbell M, Cho YM, de Montigny M, De Roeck A, Ellis JR, Sawy ME, Fairbairn M, Felea D, Frank M, Gould O, Hays J, Hirt AM, Ho DL-J, Hung PQ, Janecek J, Kalliokoski M, Korzenev A, Lacarrère DH, Leroy C, Levi G, Lionti A, Maulik A, Margiotta A, Mauri N, Mavromatos NE, Mermod P, Millward L, Mitsou VA, Ostrovskiy I, Ouimet P-P, Papavassiliou J, Parker B, Patrizii L, Păvălaş GE, Pinfold JL, Popa LA, Popa V, Pozzato M, Pospisil S, Rajantie A, de Austri RR, Sahnoun Z, Sakellariadou M, Santra A, Sarkar S, Semenoff G, Shaa A, Sirri G, Sliwa K, Soluk R, Spurio M, Staelens M, Suk M, Tenti M, Togo V, Tuszyn'ski JA, Upreti A, Vento V, Vives Oet al., 2022,

    Search for magnetic monopoles produced via the Schwinger mechanism.

    , Nature, Vol: 602, Pages: 63-67

    Electrically charged particles can be created by the decay of strong enough electric fields, a phenomenon known as the Schwinger mechanism1. By electromagnetic duality, a sufficiently strong magnetic field would similarly produce magnetic monopoles, if they exist2. Magnetic monopoles are hypothetical fundamental particles that are predicted by several theories beyond the standard model3-7 but have never been experimentally detected. Searching for the existence of magnetic monopoles via the Schwinger mechanism has not yet been attempted, but it is advantageous, owing to the possibility of calculating its rate through semi-classical techniques without perturbation theory, as well as that the production of the magnetic monopoles should be enhanced by their finite size8,9 and strong coupling to photons2,10. Here we present a search for magnetic monopole production by the Schwinger mechanism in Pb-Pb heavy ion collisions at the Large Hadron Collider, producing the strongest known magnetic fields in the current Universe11. It was conducted by the MoEDAL experiment, whose trapping detectors were exposed to 0.235 per nanobarn, or approximately 1.8 × 109, of Pb-Pb collisions with 5.02-teraelectronvolt center-of-mass energy per collision in November 2018. A superconducting quantum interference device (SQUID) magnetometer scanned the trapping detectors of MoEDAL for the presence of magnetic charge, which would induce a persistent current in the SQUID. Magnetic monopoles with integer Dirac charges of 1, 2 and 3 and masses up to 75 gigaelectronvolts per speed of light squared were excluded by the analysis at the 95% confidence level. This provides a lower mass limit for finite-size magnetic monopoles from a collider search and greatly extends previous mass bounds.
  • Journal article
    Alday LF, Chester SM, Raj H, 2022,

    ABJM at strong coupling from M-theory, localization, and Lorentzian inversion

    , Journal of High Energy Physics, Vol: 2022

    <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>We study the stress tensor multiplet four-point function in the 3d maximally supersymmetric ABJ(M) theory with Chern-Simons level <jats:italic>k</jats:italic> = 2, which in the large <jats:italic>N</jats:italic> limit is holographically dual to weakly coupled M-theory on <jats:italic>AdS</jats:italic><jats:sub>4</jats:sub> × <jats:italic>S</jats:italic><jats:sup>7</jats:sup><jats:italic>/</jats:italic>ℤ<jats:sub>2</jats:sub>. We use the Lorentzian inversion to compute the 1-loop correction to this holographic correlator coming from Witten diagrams with supergravity <jats:italic>R</jats:italic> and the first higher derivative correction <jats:italic>R</jats:italic><jats:sup>4</jats:sup> vertices, up to a finite number of contact terms that contribute to low spins where the inversion formula does not converge. We find a precise match with the corresponding terms in the 11d M-theory S-matrix by taking the flat space limit, which is not sensitive to these contact terms. We then conjecturally fix these contact terms by analytically continuing the inversion formula below its expected range of convergence, and verify this conjecture using supersymmetric localization. Finally, we compare some of the 1-loop CFT data to non-perturbative in <jats:italic>N</jats:italic> bounds from the numerical conformal bootstrap, which we compute at unprecedently high accuracy, and find that the 1-loop corrections saturate the bounds in the large <jats:italic>N</jats:italic> regime, which extends the previously observed match at tree level.</jats:p>
  • Journal article
    Arvanitakis AS, Hohm O, Hull C, Lekeu Vet al., 2022,

    Homotopy transfer and effective field theory I: tree-level

    , Fortschritte Der Physik/Progress of Physics, Vol: 70, Pages: 1-36, ISSN: 0015-8208

    We use the dictionary between general field theories and strongly homotopyalgebras to provide an algebraic formulation of the procedure of integratingout of degrees of freedom in terms of homotopy transfer. This includes moregeneral effective theories in which some massive modes are kept while othermodes of a comparable mass scale are integrated out, as first explored by Senin the context of closed string field theory. We treatL∞-algebras both in termsof a nilpotent coderivation and, on the dual space, in terms of a nilpotentderivation (corresponding to the BRST charge of the field theory) and provideexplicit formulas for homotopy transfer. These are then shown to govern theintegrating out of degrees of freedom at tree level, while the generalization toloop level will be explored in a sequel to this paper.
  • Journal article
    Erickson CW, Leung R, Stelle KS, 2022,

    Taxonomy of brane gravity localisations

    , The Journal of High Energy Physics, Vol: 2022, Pages: 1-63, ISSN: 1029-8479

    Generating an effective theory of lower-dimensional gravity on a submanifold within an original higher-dimensional theory can be achieved even if the reduction space is non-compact. Localisation of gravity on such a lower-dimensional worldvolume can be interpreted in a number of ways. The first scenario, Type I, requires a mathematically consistent Kaluza-Klein style truncation down to a theory in the lower dimension, in which case solutions purely within that reduced theory exist. However, that situation is not a genuine localisation of gravity because all such solutions have higher-dimensional source extensions according to the Kaluza-Klein ansatz. Also, there is no meaningful notion of Newton’s constant for such Type I constructions.Types II and III admit coupling to genuinely localised sources in the higher-dimensional theory, with corresponding solutions involving full sets of higher-dimensional modes. Type II puts no specific boundary conditions near the worldvolume aside from regularity away from sources. In a case where the wave equation separated in the non-compact space transverse to the worldvolume admits a normalisable zero mode, the Type III scenario requires boundary conditions near the worldvolume that permit the inclusion of that zero mode in mode expansions for gravitational wave fluctuations or potentials. In such a case, an effective theory of lower-dimensional gravity can emerge at sufficiently large worldvolume distance scales.This taxonomy of brane gravity localisations is developed in detail for linearised perturbations about a background incorporating the vacuum solution of Salam-Sezgin theory when embedded into ten-dimensional supergravity with a hyperbolic non-compact transverse space. Interpretations of the Newton constant for the corresponding Type III localisation are then analysed.
  • Journal article
    Beccaria M, Tseytlin AA, 2022,

    1/N expansion of circular Wilson loop in N = 2 superconformal SU(N) x SU(N) quiver (vol 265, JHEP04, 2021)

    , The Journal of High Energy Physics, Vol: 115, ISSN: 1029-8479
  • Journal article
    Ferrero P, Gauntlett JP, Sparks J, 2022,

    Supersymmetric spindles

    , The Journal of High Energy Physics, Vol: 102, ISSN: 1029-8479

    In the context of holography, we analyse aspects of supersymmetric geometries based on two-dimensional orbifolds known as spindles. By analysing spinc spinors on a spindle with an azimuthal rotation symmetry we show that under rather general conditions there are just two possibilities, called the ‘twist’ and the ‘anti-twist’, which are determined by the quantized magnetic flux through the spindle. A special case of the twist is the standard topological twist which is associated with constant and chiral spinors. We construct solutions of D = 5 and D = 4 STU gauged supergravity theories that are dual to D3-branes and M2-branes wrapping spindles, respectively, which realize both the anti-twist, as seen before, but also the twist. For the wrapped D3-brane solutions we reproduce the central charge of the gravity solution from the dual field theory by analysing the anomaly polynomial of N = 4 SYM theory. We also discuss M5-branes wrapped on spindles both from a gravity and a field theory point of view.
  • Journal article
    Renzini A, Romano JD, Contaldi CR, Cornish NJet al., 2022,

    Comparison of maximum-likelihood mapping methods for gravitational-wave backgrounds

    , Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 105, Pages: 1-12, ISSN: 1550-2368

    Detection of a stochastic background of gravitational waves is likely to occur in the next few years. Beyond searches for the isotropic component of a stochastic gravitational-wave background, there have been various mapping methods proposed to target anisotropic backgrounds. Some of these methods have been applied to data taken by the Laser Interferometer Gravitational-wave Observatory (LIGO) and Virgo. Specifically, these directional searches have focused on mapping the intensity of the signal on the sky via maximum-likelihood solutions. We compare this intensity mapping approach to a previously proposed, but never employed, amplitude-phase mapping method to understand whether this latter approach may be employed in future searches. We build up our understanding of the differences between these two approaches by analyzing simple toy models of time-stream data, and we run mock-data mapping tests for the two methods. We find that the amplitude-phase method is only applicable to the case of a background which is phase coherent on large scales or, at the very least, has an intrinsic coherence scale that is larger than the resolution of the detector. Otherwise, the amplitude-phase mapping method leads to an overall loss of information, with respect to both phase and amplitude. Since we do not expect these phase-coherent properties to hold for any of the gravitational-wave background signals we hope to detect in the near future, we conclude that intensity mapping is the preferred method for such backgrounds.
  • Journal article
    Beccaria M, Giombi S, Tseytlin AA, 2022,

    Higher order RG flow on the Wilson line in N=4 SYM

    , The Journal of High Energy Physics, Vol: 2022, Pages: 1-28, ISSN: 1029-8479

    Extending earlier work, we find the two-loop term in the beta-function for the scalar coupling ζ in a generalized Wilson loop operator of the N = 4 SYM theory, working in the planar weak-coupling expansion. The beta-function for ζ has fixed points at ζ = ±1 and ζ = 0, corresponding respectively to the supersymmetric Wilson-Maldacena loop and to the standard Wilson loop without scalar coupling. As a consequence of our result for the beta-function, we obtain a prediction for the two-loop term in the anomalous dimension of the scalar field inserted on the standard Wilson loop. We also find a subset of higher-loop contributions (with highest powers of ζ at each order in ‘t Hooft coupling λ) coming from the scalar ladder graphs determining the corresponding terms in the five-loop beta-function. We discuss the related structure of the circular Wilson loop expectation value commenting, in particular, on consistency with a 1d defect version of the F-theorem. We also compute (to two loops in the planar ladder model approximation) the two-point correlators of scalars inserted on the Wilson line
  • Journal article
    de Rham C, Heisenberg L, Kumar A, Zosso Jet al., 2022,

    Quantum stability of a new Proca theory

    , Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 105, Pages: 1-8, ISSN: 1550-2368

    The construction of general derivative self-interactions for a massive Proca field relies on the well-known condition for constrained systems of having a degenerate Hessian. The nature of the existing constraints algebra will distinguish among different classes of interactions. Proca-Nuevo interactions enjoy a nontrivial constraint by mixing terms of various order whereas generalized Proca interactions satisfy the degeneracy condition order by order for each individual Lagrangian. In both cases the vector field propagates at most 3 degrees of freedom. It has been shown that the scattering amplitudes of Proca-Nuevo arising at the tree level always differ from those of the generalized Proca, implying their genuinely different nature and a lack of relation by local field redefinitions. In this work, we show the quantum stability of the Proca-Nuevo theory below a specific UV cutoff. Although Proca-Nuevo and generalized Proca are different inherently in their classical structure, both have the same high energy behavior when quantum corrections are taken into account. The arising counterterms have the exact same structure and scaling. This might indicate that whatever UV completion they may come from, we expect it to be of similar nature.
  • Journal article
    Seoane PA, Sedda MA, Babak S, Berry CPL, Berti E, Bertone G, Blas D, Bogdanovic T, Bonetti M, Breivik K, Brito R, Caldwell R, Capelo PR, Caprini C, Cardoso V, Carson Z, Chen H-Y, Chua AJK, Dvorkin I, Haiman Z, Heisenberg L, Isi M, Karnesis N, Kavanagh BJ, Littenberg TB, Mangiagli A, Marcoccia P, Maselli A, Nardini G, Pani P, Peloso M, Pieroni M, Ricciardone A, Sesana A, Tamanini N, Toubiana A, Valiante R, Vretinaris S, Weir DJ, Yagi K, Zimmerman Aet al., 2022,

    The effect of mission duration on LISA science objectives

    , GENERAL RELATIVITY AND GRAVITATION, Vol: 54, ISSN: 0001-7701
  • Journal article
    Bugden M, Hulik O, Valach F, Waldram Det al., 2022,

    Exceptional algebroids and Type IIB superstrings

    , Fortschritte Der Physik/Progress of Physics, Vol: 70, Pages: 1-8, ISSN: 0015-8208

    In this note we study exceptional algebroids, focusing on their relation to type IIB superstring theory. We show that a IIB-exact exceptional algebroid (corresponding to the group urn:x-wiley:00158208:media:prop202100104:prop202100104-math-0001, for urn:x-wiley:00158208:media:prop202100104:prop202100104-math-0002) locally has a standard form given by the exceptional tangent bundle. We derive possible twists, given by a flat urn:x-wiley:00158208:media:prop202100104:prop202100104-math-0003-connection, a covariantly closed pair of 3-forms, and a 5-form, and comment on their physical interpretation. Using this analysis we reduce the search for Leibniz parallelisable spaces, and hence maximally supersymmetric consistent truncations, to a simple algebraic problem. We show that the exceptional algebroid perspective also gives a simple description of Poisson–Lie U-duality without spectators and hence of generalised Yang–Baxter deformations.
  • Journal article
    Alexandre B, Magueijo J, 2021,

    Semiclassical limit problems with concurrent use of several clocks in quantum cosmology

    , Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 104, ISSN: 1550-2368

    We revisit a recent proposal for a definition of time in quantum cosmology, to investigate the effects of having more than one possible type of clock “at the same time.” We use as a test tube an extension of Einstein gravity with a massless scalar field in which the gravitational coupling GN is only a constant on-shell, mimicking the procedure for Λ in unimodular gravity. Hence we have two “simultaneous” clocks in the theory: a scalar field clock, and the conjugate of GN. We find that attempts to use two coherent clocks concurrently are disastrous for recovering the classical limit. The Heisenberg relations, instead of being saturated, are always realized abundantly above their bound, with strong quantum effects expected at least in parts of the trajectory. Semiclassical states always result from situations where we effectively impose a single clock, either by making the other clock a failed clock (i.e., by choosing a state where its conjugate constant is infinitely sharp) or by choosing a basis of constants where all clocks but one are redundant; i.e., motion or change in phase space does not occur with the passing of their “times.” We show how this conclusion generalizes to fluids with any equation of state. It also applies to systems where “subclocks” of the same type could be used, for example, in mixtures of different fluids with the same equation of state.https://journals.aps.org/prd/abstract/10.1103/PhysRevD.104.124069
  • Journal article
    Borsten L, Duff MJ, Nagy S, 2021,

    Odd dimensional analogue of the Euler characteristic

    , The Journal of High Energy Physics, Vol: 2021, ISSN: 1029-8479

    When compact manifolds X and Y are both even dimensional, their Euler characteristics obey the Künneth formula χ(X × Y) = χ(X)χ(Y). In terms of the Betti numbers bp(X), χ(X) = Σp(−1)pbp(X), implying that χ(X) = 0 when X is odd dimensional. We seek a linear combination of Betti numbers, called ρ, that obeys an analogous formula ρ(X × Y) = χ(X)ρ(Y) when Y is odd dimensional. The unique solution is ρ(Y) = − Σp(−1)ppbp(Y). Physical applications include: (1) ρ → (−1)mρ under a generalized mirror map in d = 2m + 1 dimensions, in analogy with χ → (−1)mχ in d = 2m; (2) ρ appears naturally in compactifications of M-theory. For example, the 4-dimensional Weyl anomaly for M-theory on X4 × Y7 is given by χ(X4)ρ(Y7) = ρ(X4 × Y7) and hence vanishes when Y7 is self-mirror. Since, in particular, ρ(Y × S1) = χ(Y), this is consistent with the corresponding anomaly for Type IIA on X4 × Y6, given by χ(X4)χ(Y6) = χ(X4 × Y6), which vanishes when Y6 is self-mirror; (3) In the partition function of p-form gauge fields, ρ appears in odd dimensions as χ does in even.
  • Journal article
    Alday LF, Chester SM, Hansen T, 2021,

    Modular invariant holographic correlators for $$ \mathcal{N} $$ = 4 SYM with general gauge group

    , Journal of High Energy Physics, Vol: 2021

    <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>We study the stress tensor four-point function for <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{N} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>N</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> = 4 SYM with gauge group <jats:italic>G</jats:italic> = SU(<jats:italic>N</jats:italic>), SO(2<jats:italic>N</jats:italic> + 1), SO(2<jats:italic>N</jats:italic>) or USp(2<jats:italic>N</jats:italic>) at large <jats:italic>N</jats:italic> . When <jats:italic>G</jats:italic> = SU(<jats:italic>N</jats:italic>), the theory is dual to type IIB string theory on <jats:italic>AdS</jats:italic><jats:sub>5</jats:sub><jats:italic>× S</jats:italic><jats:sup>5</jats:sup> with complexified string coupling <jats:italic>τ</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>, while for the other cases it is dual to the orbifold theory on <jats:italic>AdS</jats:italic><jats:sub>5</jats:sub><jats:italic>× S</jats:italic><jats:sup>5</jats:sup><jats:italic>/</jats:italic>ℤ<jats:sub>2</jats:sub>. In all cases we use the analytic bootstrap and constraints from localization to compute 1-loop and higher derivative tree level corrections to the leading supergravity approximation of the correlator. We give perturbative evidence that the localization constraint in the large <jats:italic>N</jats:italic> and finite complexified coupling <jats:italic>τ</jats:italic> limit can be written for each <jats:italic>G</j
  • Journal article
    Gledhill K, Hanany A, 2021,

    Coulomb branch global symmetry and quiver addition

    , JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
  • Journal article
    Aharony O, Chester SM, Urbach EY, 2021,

    AdS from CFT for scalar QED

    , Physical Review D, Vol: 104, ISSN: 2470-0010
  • Journal article
    Bourget A, Grimminger JF, Hanany A, Kalveks R, Sperling M, Zhong Zet al., 2021,

    Folding orthosymplectic quivers

    , JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
  • Journal article
    Seibold FK, Sfondrini A, 2021,

    Bethe ansatz for quantum-deformed strings

    , JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
  • Journal article
    Gambrel AE, Rahlin AS, Song X, Contaldi CR, Ade PAR, Amiri M, Benton SJ, Bergman AS, Bihary R, Bock JJ, Bond JR, Bonetti JA, Bryan SA, Chiang HC, Duivenvoorden AJ, Eriksen HK, Farhang M, Filippini JP, Fraisse AA, Freese K, Galloway M, Gandilo NN, Gualtieri R, Gudmundsson JE, Halpern M, Hartley J, Hasselfield M, Hilton G, Holmes W, Hristov VV, Huang Z, Irwin KD, Jones WC, Karakci A, Kuo CL, Kermish ZD, Leung JS-Y, Li S, Mak DSY, Mason PV, Megerian K, Moncelsi L, Morford TA, Nagy JM, Netterfield CB, Nolta M, O'Brient R, Osherson B, Padilla IL, Racine B, Reintsema C, Ruhl JE, Ruud TM, Shariff JA, Shaw EC, Shiu C, Soler JD, Trangsrud A, Tucker C, Tucker RS, Turner AD, van der List JF, Weber AC, Wehus IK, Wen S, Wiebe DV, Young EYet al., 2021,

    The XFaster power spectrum and likelihood estimator for the analysis of cosmic microwave background maps

    , The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 922, Pages: 1-17, ISSN: 0004-637X

    We present the XFaster analysis package, a fast, iterative angular power spectrum estimator based on a diagonal approximation to the quadratic Fisher matrix estimator. It uses Monte Carlo simulations to compute noise biases and filter transfer functions and is thus a hybrid of both Monte Carlo and quadratic estimator methods. In contrast to conventional pseudo-Cℓ–based methods, the algorithm described here requires a minimal number of simulations and does not require them to be precisely representative of the data to estimate accurate covariance matrices for the bandpowers. The formalism works with polarization-sensitive observations and also data sets with identical, partially overlapping, or independent survey regions. The method was first implemented for the analysis of BOOMERanG data and also used as part of the Planck analysis. Here we describe the full, publicly available analysis package, written in Python, as developed for the analysis of data from the 2015 flight of the Spider instrument. The package includes extensions for self-consistently estimating null spectra and estimating fits for Galactic foreground contributions. We show results from the extensive validation of XFaster using simulations and its application to the Spider data set.
  • Journal article
    Bloor S, Gonzalo TE, Scott P, Chang C, Raklev A, Camargo-Molina JE, Kvellestad A, Renk JJ, Athron P, Balazs Cet al., 2021,

    The GAMBIT Universal Model Machine: from Lagrangians to likelihoods

    , EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
  • Journal article
    Chester SM, Landry W, Liu J, Poland D, Simmons-Duffin D, Su N, Vichi Aet al., 2021,

    Bootstrapping Heisenberg magnets and their cubic instability

    , Physical Review D, Vol: 104, ISSN: 2470-0010
  • Journal article
    Cable A, Rajantie A, 2021,

    Free scalar correlators in de Sitter space via the stochastic approach beyond the slow-roll approximation

    , Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 104, ISSN: 1550-2368

    The stochastic approach to calculating scalar correlation functions in de Sitter spacetime is extended beyond the overdamped “slow-roll” approximation. We show that with the correct noise term, it reproduces the exact asymptotic long-distance behavior of field correlators in free field theory, thereby demonstrating the viability of the technique. However, we also show that the naïve way of calculating the noise term by introducing a cutoff at the horizon does not give the correct answer unless the cutoff is chosen specifically to give the required result. We discuss the implications of this for interacting theories.
  • Journal article
    Gonzalez MC, de Rham C, Tolley AJ, 2021,

    Scattering amplitudes for binary systems beyond GR

    , The Journal of High Energy Physics, Vol: 87, Pages: 1-36, ISSN: 1029-8479

    Amplitude methods have proven to be a promising technique to perform Post-Minkowskian calculations used as inputs to construct gravitational waveforms. In this paper, we show how these methods can be extended beyond the standard calculations in General Relativity with a minimal coupling to matter. As proof of principle, we consider spinless particles conformally coupled to a gravitational helicity-0 mode. We clarify the subtleties in the matching procedure that lead to the potential for conformally coupled matter. We show that in the probe particle limit, we can reproduce well known results for the field profile. With the scattering amplitudes at hand, we compute the conservative potential and scattering angle for the binary system. We find that the result is a non trivial expansion that involves not only the coupling strengths, but also a non trivial dependence on the energy/momentum of the scattered particles.
  • Journal article
    Ferrero P, Gauntlett JP, Martelli D, Sparks Jet al., 2021,

    M5-branes wrapped on a spindle

    , The Journal of High Energy Physics, Vol: 2021, Pages: 1-21, ISSN: 1029-8479

    We construct supersymmetric AdS5 × Σ solutions of D = 7 gauged supergravity, where Σ is a two-dimensional orbifold known as a spindle. These uplift on S4 to solutions of D = 11 supergravity which have orbifold singularites. We argue that the solutions are dual to d = 4, N = 1 SCFTs that arise from N M5-branes wrapped on a spindle, embedded as a holomorphic curve inside a Calabi-Yau three-fold. In contrast to the usual topological twist solutions, the superconformal R-symmetry mixes with the isometry of the spindle in the IR, and we verify this via a field theory calculation, as well as reproducing the gravity formula for the central charge.
  • Conference paper
    Jones H, Kulishov M, 2021,

    Solitons in a PT-symmetric grating-assisted co-directional coupler

    , ISSN: 1742-6588

    We explore a co-directional coupling arrangement between two waveguides mediated by a PT-symmetric sinusoidal grating characterized by an index-modulation parameter κ and a gain/loss parameter g. We show that the device supports soliton-like solutions for both the PT-conserving regime g < κ and the PT-broken regime g > κ. In the first case the coupler exhibits a gap in wave-number k, and the solitons can be regarded as an extension of a previous solution found for pure index modulation. In the second case the coupler exhibits a gap in frequency ω and the solutions are entirely new.
  • Journal article
    Camargo-Molina JE, Enberg R, Lofgren J, 2021,

    A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory

    , JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
  • Journal article
    Cassani D, Gauntlett JP, Martelli D, Sparks Jet al., 2021,

    Thermodynamics of accelerating and supersymmetric AdS(4) black holes

    , Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 104, Pages: 1-23, ISSN: 1550-2368

    We study the thermodynamics of AdS4 black hole solutions of Einstein-Maxwell theory that are accelerating, rotating, and carry electric and magnetic charges. We focus on the class for which the black hole horizon is a spindle and can be uplifted on regular Sasaki-Einstein spaces to give solutions of D=11 supergravity that are free from conical singularities. We use holography to calculate the Euclidean on-shell action and to define a set of conserved charges which give rise to a first law. We identify a complex locus of supersymmetric and nonextremal solutions, defined through an analytic continuation of the parameters, upon which we obtain a simple expression for the on-shell action. A Legendre transform of this action combined with a reality constraint then leads to the Bekenstein-Hawking entropy for the class of supersymmetric and extremal black holes.
  • Journal article
    Seibold FK, van Tongeren SJ, Zimmermann Y, 2021,

    On quantum deformations of AdS<sub>3</sub> x S<SUP>3</SUP> x T<SUP>4</SUP> and mirror duality

    , JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

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  1. Log in to Symplectic.
  2. Click on Menu > Create Links
  3. Choose what you want to create links between – in this case ‘Publications’ and ‘Organisational structures’.
  4. Choose the organisational structure (research group) into which you want to link the publications and check the box next to it.
  5. Now check the box of any publication you want to add to that group. You can use the filters to find what you want and select multiple publications if necessary. 
  6. Scroll to the bottom and click the blue ‘Create new link’ button to link them.
  7. The publications will be added to the group, and will be displayed on the group publications feed within 24 hours (it is not immediate).

Any problems, talk to Tim Evans or the Faculty Web Team.