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Journal articlede Rham C, Engelbrecht L, Heisenberg L, et al., 2022,
Positivity bounds in vector theories
, The Journal of High Energy Physics, Vol: 86, Pages: 1-40, ISSN: 1029-8479Assuming unitarity, locality, causality, and Lorentz invariance of the, otherwise unknown, UV completion, we derive a new set of constraints on the effective field theory coefficients for the most general, ghost-free Generalized Proca and Proca Nuevo massive vector models. For the Generalized Proca model, we include new interactions that had not been previously considered in the context of positivity bounds and find these additional terms lead to a widened parameter space for the previously considered interactions. Although, the Generalized Proca and Proca Nuevo models are inequivalent, we find interesting analogues between the coefficients parameterizing the two models and the roles they play in the positivity bounds.
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Journal articleShaaban MM, Gill AS, McCleary J, et al., 2022,
Weak Lensing in the Blue: A Counter-intuitive Strategy for Stratospheric Observations
, Astronomical Journal, Vol: 164, ISSN: 0004-6256The statistical power of weak lensing measurements is principally driven by the number of high-redshift galaxies whose shapes are resolved. Conventional wisdom and physical intuition suggest this is optimized by deep imaging at long (red or near-IR) wavelengths, to avoid losing redshifted Balmer-break and Lyman-break galaxies. We use the synthetic Emission Line (“EL”)-COSMOS catalog to simulate lensing observations using different filters, from various altitudes. Here were predict the number of exposures to achieve a target z ≳ 0.3 source density, using off-the-shelf and custom filters. Ground-based observations are easily better at red wavelengths, as (more narrowly) are space-based observations. However, we find that SuperBIT, a diffraction-limited observatory operating in the stratosphere, should instead perform its lensing-quality observations at blue wavelengths.
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Journal articleArun KG, Belgacem E, Benkel R, et al., 2022,
New horizons for fundamental physics with LISA
, LIVING REVIEWS IN RELATIVITY, Vol: 25, ISSN: 2367-3613- Author Web Link
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- Citations: 40
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Journal articleGonzalez MC, de Rham C, Pozsgay V, et al., 2022,
Causal effective field theories
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, Pages: 1-25, ISSN: 1550-2368Physical principles such as unitarity, causality, and locality can constrain the space of consistent effective field theories (EFTs) by imposing two-sided bounds on the allowed values of Wilson coefficients. In this paper, we consider the bounds that arise from the requirement of low energy causality alone, without appealing to any assumptions about UV physics. We focus on shift-symmetric theories, and consider bounds that arise from the propagation around both a homogeneous and a spherically symmetric scalar field background. We find that low energy causality, namely the requirement that there are no resolvable time advances within the regime of validity of the EFT, produces two-sided bounds in agreement with compact positivity constraints previously obtained from 2→2 scattering amplitude dispersion relations using full crossing symmetry.
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Journal articleAlday LF, Chester SM, 2022,
Pure Anti–de Sitter Supergravity and the Conformal Bootstrap
, Physical Review Letters, Vol: 129, ISSN: 0031-9007 -
Journal articleAlbertini E, Alexander S, Herczeg G, et al., 2022,
Torsion and the probability of inflation
, Journal of Cosmology and Astroparticle Physics, Vol: 2022, Pages: 1-14, ISSN: 1475-7516We revisit the problem of the "probability of inflation" from the point of view of the Einstein-Cartan theory, where torsion can be present off-shell even in the absence of spinorial currents. An informal estimate suggests that the barrier for tunneling from "nothing" into a classical universe becomes thinner and lower, should torsion be present, even if only off-shell. We perform a detailed calculation that supports this informal estimate for the case of torsion eigenstates. Finally, we impose a quantum mechanical analog of the zero-torsion condition by restricting to states for which the expectation value of the torsion vanishes. An explicit family of such states is obtained by building wave-packets from linear superpositions of torsion eigenstates with Gaussian weights centered around zero torsion. The tunneling probability for these wave packets is maximized when the variance of the torsion goes to zero. Hence, by considering these wave-packets as the physical states, we recover a sensible model of quantum cosmology that incorporates quantum fluctuations in the torsion, despite the apparently unacceptable conclusions one draws from naïvely considering the tunneling probabilities for the torsion eigenstates.
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Journal articleAlday LF, Chester SM, Raj H, 2022,
M-theory on AdS4 × S7 at 1-loop and beyond
, Journal of High Energy Physics, Vol: 2022<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>We study graviton scattering on <jats:italic>AdS</jats:italic><jats:sub>4</jats:sub><jats:italic>× S</jats:italic><jats:sup>7</jats:sup>, which is dual to the stress tensor multiplet four-point function in the maximally supersymmetric 3d U(<jats:italic>N</jats:italic>)<jats:sub>1</jats:sub><jats:italic>×</jats:italic> U(<jats:italic>N</jats:italic>)<jats:sub><jats:italic>−</jats:italic>1</jats:sub> ABJM theory. We compute 1-loop corrections to this holographic correlator coming from Witten diagrams with supergravity <jats:italic>R</jats:italic> and higher derivative <jats:italic>R</jats:italic><jats:sup>4</jats:sup> vertices, up to contact term ambiguities, and find that the flat space limit matches the corresponding terms in the 11d M-theory S-matrix. We then use supersymmetric localization to show that all the 1-loop contact terms vanish, as was previously observed for the <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> theory dual to U(<jats:italic>N</jats:italic>)<jats:sub>2</jats:sub><jats:italic>×</jats:italic> U(<jats:italic>N</jats:italic>)<jats:sub><jats:italic>−</jats:italic>2</jats:sub> ABJM. Finally, we use the recent localization results of Gaiotto and Abajian, as inspired by twisted M-theory, to compute all the short OPE coefficients in correlators of the stress tensor multiplet and the next lowest half-BPS operator, which we find saturate the bootstrap bounds on these mixed correlators for all <jats:ital
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Journal articleHanany A, Sperling M, 2022,
Magnetic quivers and negatively charged branes
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Cite
- Citations: 3
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Journal articleBartolo N, Bertacca D, Caldwell R, et al., 2022,
Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
, Journal of Cosmology and Astroparticle Physics, Vol: 2022, ISSN: 1475-7516We investigate the sensitivity of the Laser Interferometer Space Antenna (LISA) to the anisotropies of the Stochastic Gravitational Wave Background (SGWB). We first discuss the main astrophysical and cosmological sources of SGWB which are characterized by anisotropies in the GW energy density, and we build a Signal-to-Noise estimator to quantify the sensitivity of LISA to different multipoles. We then perform a Fisher matrix analysis of the prospects of detectability of anisotropic features with LISA for individual multipoles, focusing on a SGWB with a power-law frequency profile. We compute the noise angular spectrum taking into account the specific scan strategy of the LISA detector. We analyze the case of the kinematic dipole and quadrupole generated by Doppler boosting an isotropic SGWB. We find that β ΩGW ∼ 2 × 10-11 is required to observe a dipolar signal with LISA. The detector response to the quadrupole has a factor ∼ 103 β relative to that of the dipole. The characterization of the anisotropies, both from a theoretical perspective and from a map-making point of view, allows us to extract information that can be used to understand the origin of the SGWB, and to discriminate among distinct superimposed SGWB sources.
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Journal articleFilippini JP, Gambrel AE, Rahlin AS, et al., 2022,
In-Flight Gain Monitoring of SPIDER's Transition-Edge Sensor Arrays
, JOURNAL OF LOW TEMPERATURE PHYSICS, Vol: 209, Pages: 649-657, ISSN: 0022-2291- Author Web Link
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- Citations: 1
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Journal articleHull C, 2022,
Gravity, duality and conformal symmetry
, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 478, ISSN: 1364-5021 -
Journal articlePieroni M, Ricciardone A, Barausse E, 2022,
Detectability and parameter estimation of stellar origin black hole binaries with next generation gravitational wave detectors
, SCIENTIFIC REPORTS, Vol: 12, ISSN: 2045-2322- Author Web Link
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- Citations: 7
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Journal articleKurlyand SA, Tseytlin AA, 2022,
Type IIB supergravity action on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>M</mml:mi><mml:mn>5</mml:mn></mml:msup><mml:mo>×</mml:mo><mml:msup><mml:mi>X</mml:mi><mml:mn>5</mml:mn></mml:msup></mml:math> solutions
, Physical Review D, Vol: 106, ISSN: 2470-0010 -
Journal articleKurlyand SA, Tseytlin AA, 2022,
Type IIB supergravity action on M5 x X5 solutions
, PHYSICAL REVIEW D, Vol: 106, ISSN: 2470-0010- Cite
- Citations: 3
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Journal articleRoberts MM, Wiseman T, 2022,
Reply to"Comment on 'Curved-space Dirac description of elastically deformed monolayer graphene is generally incorrect'"
, PHYSICAL REVIEW B, Vol: 106, ISSN: 2469-9950- Cite
- Citations: 1
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Journal articleMagueijo J, 2022,
Connection between cosmological time and the constants of nature
, PHYSICAL REVIEW D, Vol: 106, Pages: 1-16, ISSN: 2470-0010We examine in greater detail the proposal that time is the conjugate of the constants of nature. Fundamentally distinct times are associated with different constants, a situation often found in “relational time” settings. We show how in regions dominated by a single constant the Hamiltonian constraint can be reframed as a Schrödinger equation in the corresponding time, solved in the connection representation by outgoing-only monochromatic plane waves moving in a “space” that generalizes the Chern-Simons functional (valid for the equation of state w=−1) for other w. We pay special attention to the issues of unitarity and the measure employed for the inner product. Normalizable superpositions can be built, including solitons, “light-rays” and coherent/squeezed states saturating a Heisenberg uncertainty relation between constants and their times. A healthy classical limit is obtained for factorizable coherent states, both in monofluid and multifluid situations. For the latter, we show how to deal with transition regions, where one is passing on the baton from one time to another, and investigate the fate of the subdominant clock. For this purpose minisuperspace is best seen as a dispersive medium, with packets moving with a group speed distinct from the phase speed. We show that the motion of the packets’ peaks reproduces the classical limit even during the transition periods, and for subdominant clocks once the transition is over. Deviations from the coherent/semiclassical limit are expected in these cases, however. The fact that we have recently transitioned from a decelerating to an accelerating Universe renders this proposal potentially testable, as explored elsewhere.
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Journal articleArav I, Gauntlett JP, Roberts MM, et al., 2022,
Leigh-Strassler compactified on a spindle
, The Journal of High Energy Physics, Vol: 2022, Pages: 1-47, ISSN: 1029-8479We construct a new class of supersymmetric AdS3 × Y7 solutions of type IIB supergravity, where Y7 is an S5 fibration over a spindle, which are dual to d = 2, N = (0, 2) SCFTs. The solutions are constructed in a sub-truncation of D = 5, SO(6) maximal gauged supergravity and they all lie within the anti-twist class. We show that the central charge computed from the gravity solutions agrees with an anomaly polynomial calculation associated with compactifying the N = 1, d = 4 Leigh-Strassler SCFT on a spindle.
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Journal articleMantziris A, Markkanen T, Rajantie A, 2022,
The effective Higgs potential and vacuum decay in Starobinsky inflation
, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516- Cite
- Citations: 1
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Journal articleBeccaria M, Korchemsky GP, Tseytlin A, 2022,
Strong coupling expansion in <i>N</i>=2 superconformal theories and the Bessel kernel
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Cite
- Citations: 6
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Journal articleFigueroa DG, Florio A, Loayza N, et al., 2022,
Spectroscopy of particle couplings with gravitational waves
, PHYSICAL REVIEW D, Vol: 106, ISSN: 2470-0010- Author Web Link
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- Citations: 3
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Journal articleAlexandre B, Magueijo J, 2022,
Possible quantum effects at the transition from cosmological deceleration to acceleration
, Physical Review D, Vol: 106, Pages: 1-13, ISSN: 2470-0010The recent transition from decelerated to accelerated expansion can be seen as a reflection (or “bounce”) in the connection variable, defined by the inverse comoving Hubble length (b=˙a, on shell). We study the quantum cosmology of this process. We use a formalism for obtaining relational time variables either through the demotion of the constants of nature to integration constants, or by identifying fluid constants of motion. We extend its previous application to a toy model (radiation and Λ) to the realistic setting of a transition from dust matter to Λ domination. In the dust and Λ model two time variables may be defined, conjugate to Λ and to the dust constant of motion, and we work out the monochromatic solutions to the Schrödinger equation representing the Hamiltonian constraint. As for their radiation and Λ counterparts, these solutions exhibit “ringing,” whereby the incident and reflected waves interfere, leading to oscillations in the amplitude. In the semiclassical approximation we find that, close to the bounce, the probability distribution becomes double peaked, one peak following a trajectory close to the classical limit but with a Hubble parameter slightly shifted downwards, the other with a value of b stuck at its minimum b=b⋆. Still closer to the transition, the distribution is better approximated by an exponential distribution, with a single peak at b=b⋆, and a (more representative) average b biased towards a value higher than the classical trajectory. Thus, we obtain a distinctive prediction for the average Hubble parameter with redshift: slightly lower than its classical value when z≈0, but potentially much higher than the classical prediction around z∼0.64, where the bounce most likely occurred. The implications for the “Hubble tension” have not escaped us.
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Journal articleMkrtchyan K, Svazas M, 2022,
Solutions in Nonlinear Electrodynamics and their double copy regular black holes
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleHoare B, Seibold FK, Tseytlin AA, 2022,
Integrable supersymmetric deformations of AdS(3)x S(3)x T-4
, The Journal of High Energy Physics, Vol: 2022, Pages: 1-39, ISSN: 1029-8479We construct a family of type IIB string backgrounds that are deformations of AdS3 × S3 × T4 with a “squashed” AdS3 × S3 metric supported by a combination of NSNS and RR fluxes. They have global SU(1, 1) × SU(2) symmetry, regular curvature, constant dilaton and preserve 8 supercharges. Upon compactification to 4 dimensions they reduce to N = 2 supersymmetric AdS2 × S2 solutions with electric and magnetic Maxwell fluxes. These type IIB supergravity solutions can be found from the undeformed AdS3 × S3 × T4 background by a combination of T-dualities and S-duality. In contrast to T-duality, S-duality transformations of a type IIB supergravity background do not generally preserve the classical integrability of the corresponding Green-Schwarz superstring sigma model. Nevertheless, we show that integrability is preserved in the present case. Indeed, we find that these backgrounds can be obtained, up to T-dualities, from an integrable inhomogeneous Yang-Baxter deformation (with unimodular Drinfel’d-Jimbo R-matrix) of the original AdS3 × S3 supercoset model.
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Journal articleHoare B, Seibold FK, Tseytlin AA, 2022,
Integrable supersymmetric deformations of AdS<inf>3</inf> × S<sup>3</sup> × T<sup>4</sup>
, Journal of High Energy Physics, Vol: 2022We construct a family of type IIB string backgrounds that are deformations of AdS3× S3× T4 with a “squashed” AdS3× S3 metric supported by a combination of NSNS and RR fluxes. They have global SU(1, 1) × SU(2) symmetry, regular curvature, constant dilaton and preserve 8 supercharges. Upon compactification to 4 dimensions they reduce to N = 2 supersymmetric AdS2× S2 solutions with electric and magnetic Maxwell fluxes. These type IIB supergravity solutions can be found from the undeformed AdS3× S3× T4 background by a combination of T-dualities and S-duality. In contrast to T-duality, S-duality transformations of a type IIB supergravity background do not generally preserve the classical integrability of the corresponding Green-Schwarz superstring sigma model. Nevertheless, we show that integrability is preserved in the present case. Indeed, we find that these backgrounds can be obtained, up to T-dualities, from an integrable inhomogeneous Yang-Baxter deformation (with unimodular Drinfel’d-Jimbo R-matrix) of the original AdS3× S3 supercoset model.
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Journal articleLeung R, Stelle KS, 2022,
Supergravities on branes
, The Journal of High Energy Physics, Vol: 2022, ISSN: 1029-8479Supergravity brane solutions allow for a generalised type of Kaluza-Klein reduction onto brane worldvolumes. The known replacement of a flat worldvolume metric by a Ricci-flat metric constitutes a consistent Kaluza-Klein truncation of the starting higher-dimensional supergravity theory down to a lower-dimensional pure gravity theory.This paper shows how to extend such a brane-worldvolume pure-gravity consistent truncation to that for a full nonlinear supergravity theory for the Type IIB D3-brane and the M-theory/Type IIA M5-brane. The extension of worldvolume supersymmetry is given by the unbroken supersymmetry of the original flat “skeleton” brane. Compatibility with further worldvolume diagonal and transverse vertical dimensional reductions is also shown, providing the brane-worldvolume supergravity embeddings of all descendants of the skeleton D3- and M5-branes. Examples are given of brane-worldvolume supergravity solutions embedded into the corresponding higher-dimensional supergravities.
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Journal articleBourget A, Grimminger JF, Hanany A, et al., 2022,
The Hasse diagram of the moduli space of instantons
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Cite
- Citations: 4
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Journal articleErickson CW, Leung R, Stelle KS, 2022,
Higgs effect without lunch
, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol: 380, ISSN: 1364-503XReduction in effective spacetime dimensionality can occur in field-theorymodels more general than the widely studied dimensional reductions based ontechnically consistent truncations. Situations where wavefunction factorsdepend nontrivially on coordinates transverse to the effective lower dimensioncan give rise to unusual patterns of gauge symmetry breaking. Leading-ordergauge modes can be left massless, but naturally occurring Stueckelberg modescan couple importantly at quartic order and higher, thus generating a "covert"pattern of gauge symmetry breaking. Such a situation is illustrated in afive-dimensional model of scalar electrodynamics in which one spatial dimensionis taken to be an interval with Dirichlet/Robin boundary conditions on opposingends. This simple model illuminates a mechanism which also has been found ingravitational braneworld scenarios.
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Journal articleGerhardinger M, Giblin JTJJ, Tolley AJ, et al., 2022,
Well-posed UV completion for simulating scalar Galileons
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, Pages: 1-10, ISSN: 1550-2368The Galileon scalar field theory is a prototypical example of an effective field theory that exhibits the Vainshtein screening mechanism, which is incorporated into many extensions to Einstein gravity. The Galileon describes the helicity-zero mode of gravitational radiation, the presence of which has significant implications for predictions of gravitational waves from orbiting objects and for tests of gravity sensitive to additional polarizations. Because of the derivative nature of their interactions, Galileons are superficially not well posed as effective field theories. Although this property is properly understood merely as an artifact of the effective field theory truncation, and is not theoretically worrisome, at the practical level it nevertheless renders numerical simulation highly problematic. Notwithstanding, previous numerical approaches have successfully evolved the system for reasonable initial data by slowly turning on the interactions. We present here two alternative approaches to improving numerical stability in Galileon numerical simulations. One of these is a minor modification of previous approaches, which introduces a low-pass filter that amounts to imposing a UV cutoff together with a relaxation method of turning on interactions. The second approach amounts to constructing a (numerical) UV completion for which the dynamics of the high momentum modes is under control and for which it is unnecessary to slowly turn on nonlinear interactions. We show that numerical simulations of the UV theory successfully reproduce the correct Galileon dynamics at low energies, consistent with the low-pass filter method and with previous numerical simulations.
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Journal articleAcharya B, Alexandre J, Benes P, et al., 2022,
Search for highly-ionizing particles in <i>pp</i> collisions at the LHC's Run-1 using the prototype MoEDAL detector
, EUROPEAN PHYSICAL JOURNAL C, Vol: 82, ISSN: 1434-6044- Author Web Link
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- Citations: 1
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Journal articleAvetisyan Z, Evnin O, Mkrtchyan K, 2022,
Nonlinear (chiral) <i>p</i>-form electrodynamics
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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