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Journal articlede Rham C, Heisenberg L, Kumar A, et al., 2022,
Quantum stability of a new Proca theory
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 105, Pages: 1-8, ISSN: 1550-2368The 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.
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Journal articleSeoane PA, Sedda MA, Babak S, et al., 2022,
The effect of mission duration on LISA science objectives
, GENERAL RELATIVITY AND GRAVITATION, Vol: 54, ISSN: 0001-7701- Cite
- Citations: 48
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Journal articleBugden M, Hulik O, Valach F, et al., 2022,
Exceptional algebroids and Type IIB superstrings
, Fortschritte Der Physik/Progress of Physics, Vol: 70, Pages: 1-8, ISSN: 0015-8208In 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.
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Conference paperBrighenti F, Amelino-Camelia G, Gubitosi G, et al., 2022,
Thermal dimension of quantum spacetime: Comparison with the spectral dimension and application in cosmology
, 15th Marcel Grossmann Meeting (MG), Publisher: WORLD SCIENTIFIC PUBL CO PTE LTD, Pages: 1983-1988 -
Journal articleAvetisyan Z, Evnin O, Mkrtchyan K, 2021,
Democratic Lagrangians for Nonlinear Electrodynamics
, PHYSICAL REVIEW LETTERS, Vol: 127, ISSN: 0031-9007 -
Journal articleAlexandre 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: 1550-2368We 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
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Journal articleBorsten L, Duff MJ, Nagy S, 2021,
Odd dimensional analogue of the Euler characteristic
, The Journal of High Energy Physics, Vol: 2021, ISSN: 1029-8479When 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.
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Journal articleAlday 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
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Journal articleGledhill K, Hanany A, 2021,
Coulomb branch global symmetry and quiver addition
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Cite
- Citations: 7
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Journal articleBourget A, Grimminger JF, Hanany A, et al., 2021,
Folding orthosymplectic quivers
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Cite
- Citations: 9
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Journal articleAharony O, Chester SM, Urbach EY, 2021,
AdS from CFT for scalar QED
, Physical Review D, Vol: 104, ISSN: 2470-0010 -
Journal articleGambrel AE, Rahlin AS, Song X, et 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: 0004-637XWe 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.
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Journal articleChester SM, Landry W, Liu J, et al., 2021,
Bootstrapping Heisenberg magnets and their cubic instability
, Physical Review D, Vol: 104, ISSN: 2470-0010 -
Journal articleCable 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: 1550-2368The 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.
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Journal articleGonzalez 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: 1029-8479Amplitude 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.
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Journal articleFerrero P, Gauntlett JP, Martelli D, et al., 2021,
M5-branes wrapped on a spindle
, The Journal of High Energy Physics, Vol: 2021, Pages: 1-21, ISSN: 1029-8479We 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.
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Conference paperJones H, Kulishov M, 2021,
Solitons in a PT-symmetric grating-assisted co-directional coupler
, ISSN: 1742-6588We 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.
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Journal articleJazayeri S, Pajer E, Stefanyszyn D, 2021,
From locality and unitarity to cosmological correlators
, Journal of High Energy Physics, Vol: 2021<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>In the standard approach to deriving inflationary predictions, we evolve a vacuum state in time according to the rules of a given model. Since the only observables are the future values of correlators and not their time evolution, this brings about a large degeneracy: a vast number of different models are mapped to the same minute number of observables. Furthermore, due to the lack of time-translation invariance, even tree-level calculations require an increasing number of nested integrals that quickly become intractable. Here we ask how much of the final observables can be “bootstrapped” directly from locality, unitarity and symmetries.</jats:p><jats:p>To this end, we introduce two new “boostless” bootstrap tools to efficiently compute tree-level cosmological correlators/wavefunctions without any assumption about de Sitter boosts. The first is a <jats:italic>Manifestly Local Test</jats:italic> (MLT) that any <jats:italic>n</jats:italic>-point (wave)function of massless scalars or gravitons must satisfy if it is to arise from a manifestly local theory. When combined with a sub-set of the recently proposed Bootstrap Rules, this allows us to compute explicitly all bispectra to all orders in derivatives for a single scalar. Since we don’t invoke soft theorems, this can also be extended to multi-field inflation. The second is a <jats:italic>partial energy recursion relation</jats:italic> that allows us to compute exchange correlators. Combining a bespoke complex shift of the partial energies with Cauchy’s integral theorem and the Cosmological Optical Theorem, we fix exchange correlators up to a boundary term. The latter can be determined up to contact interactions using unitarity and manifest locality. As an illustration, we use these tools to bootstrap scalar inflationary trisp
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Journal articleCassani D, Gauntlett JP, Martelli D, et 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: 1550-2368We 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.
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Journal articleKarnesis N, Babak S, Pieroni M, et al., 2021,
Characterization of the stochastic signal originating from compact binary populations as measured by LISA
, PHYSICAL REVIEW D, Vol: 104, ISSN: 2470-0010- Author Web Link
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- Citations: 96
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Journal articleBeccaria M, Dunne G, Tseytlin AA, 2021,
Strong coupling expansion of free energy and BPS Wilson loop in N=2 superconformal models with fundamental hypermultiplets
, The Journal of High Energy Physics, Vol: 2021, Pages: 1-42, ISSN: 1029-8479As a continuation of the study (in arXiv:2102.07696 and arXiv:2104.12625) of strong-coupling expansion of non-planar corrections in N = 2 4d superconformal models we consider two special theories with gauge groups SU(N) and Sp(2N). They contain N-independent numbers of hypermultiplets in rank 2 antisymmetric and fundamental representations and are planar-equivalent to the corresponding N = 4 SYM theories. These N = 2 theories can be realised on a system of N D3-branes with a finite number of D7-branes and O7-plane; the dual string theories should be particular orientifolds of AdS5 × S5 superstring. Starting with the localization matrix model representation for the N = 2 partition function on S4 we find exact differential relations between the 1/N terms in the corresponding free energy F and the 12-BPS Wilson loop expectation value ⟨W⟩ and also compute their large ’t Hooft coupling (λ » 1) expansions. The structure of these expansions is different from the previously studied models without fundamental hypermultiplets. In the more tractable Sp(2N) case we find an exact resummed expression for the leading strong coupling terms at each order in the 1/N expansion. We also determine the exponentially suppressed at large λ contributions to the non-planar corrections to F and ⟨W⟩ and comment on their resurgence properties. We discuss dual string theory interpretation of these strong coupling expansions.Download to read the full article text
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Journal articleTennyson D, Waldram D, 2021,
Exceptional complex structures and the hypermultiplet moduli of 5d Minkowski compactifications of M-theory
, The Journal of High Energy Physics, Vol: 201, Pages: 1-64, ISSN: 1029-8479We present a detailed study of a new mathematical object in E6(6)ℝ+ generalised geometry called an ‘exceptional complex structure’ (ECS). It is the extension of a conventional complex structure to one that includes all the degrees of freedom of M-theory or type IIB supergravity in six or five dimensions, and as such characterises, in part, the geometry of generic supersymmetric compactifications to five-dimensional Minkowkski space. We define an ECS as an integrable U*(6) × ℝ+ structure and show it is equivalent to a particular form of involutive subbundle of the complexified generalised tangent bundle L1 ⊂ Eℂ. We also define a refinement, an SU*(6) structure, and show that its integrability requires in addition a vanishing moment map on the space of structures. We are able to classify all possible ECSs, showing that they are characterised by two numbers denoted ‘type’ and ‘class’. We then use the deformation theory of ECS to find the moduli of any SU*(6) structure. We relate these structures to the geometry of generic minimally supersymmetric flux backgrounds of M-theory of the form ℝ4,1 × M, where the SU*(6) moduli correspond to the hypermultiplet moduli in the lower-dimensional theory. Such geometries are of class zero or one. The former are equivalent to a choice of (non-metric-compatible) conventional SL(3, ℂ) structure and strikingly have the same space of hypermultiplet moduli as the fluxless Calabi-Yau case.
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Journal articleMomeni A, Rumbutis J, Tolley AJ, 2021,
Kaluza-Klein from colour-kinematics duality for massive fields
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Author Web Link
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- Citations: 18
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Journal articleGomis J, Joung E, Kleinschmidt A, et al., 2021,
Colourful Poincare symmetry, gravity and particle actions
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleFerrero P, Gauntlett JP, Ipina JMP, et al., 2021,
Accelerating black holes and spinning spindles
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 104, Pages: 1-37, ISSN: 1550-2368We study solutions in the Plebański–Demiański family which describe an accelerating, rotating, and dyonically charged black hole in AdS4. These are solutions of D=4 Einstein-Maxwell theory with a negative cosmological constant and hence minimal D=4 gauged supergravity. It is well known that when the acceleration is nonvanishing the D=4 black hole metrics have conical singularities. By uplifting the solutions to D=11 supergravity using a regular Sasaki-Einstein seven-manifold, SE7, we show how the free parameters can be chosen to eliminate the conical singularities. Topologically, the D=11 solutions incorporate an SE7 fibration over a two-dimensional weighted projective space, WCP1[n−,n+], also known as a spindle, which is labeled by two integers that determine the conical singularities of the D=4 metrics. We also discuss the supersymmetric and extremal limit and show that the near horizon limit gives rise to a new family of regular supersymmetric AdS2×Y9 solutions of D=11 supergravity, which generalize a known family by the addition of a rotation parameter. We calculate the entropy of these black holes and argue that it should be possible to derive this from certain N=2, d=3 quiver gauge theories compactified on a spinning spindle with the appropriate magnetic flux.
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Journal articleBourget A, Dancer A, Grimminger JF, et al., 2021,
Orthosymplectic implosions
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479- Author Web Link
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- Citations: 9
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Journal articlede Rham C, Melville S, Noller J, 2021,
Positivity bounds on dark energy: when matter matters
, Journal of Cosmology and Astroparticle Physics, Vol: 2021, Pages: 1-25, ISSN: 1475-7516Positivity bounds — constraints on any low-energy effective field theory imposed by the fundamental axioms of unitarity, causality and locality in the UV — have recently been used to constrain scalar-tensor theories of dark energy. However, the coupling to matter fields has so far played a limited role. We show that demanding positivity when including interactions with standard matter fields leads to further constraints on the dark energy parameter space. We demonstrate how implementing these bounds as theoretical priors affects cosmological parameter constraints and explicitly illustrate the impact on a specific Effective Field Theory for dark energy. We also show in this model that the existence of a standard UV completion requires that gravitational waves must travel superluminally on cosmological backgrounds.
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Journal articlePage J, Magueijo J, 2021,
Linking the Baum-Hawking-Coleman mechanism with unimodular gravity and Vilenkin's probability flux
, Journal of Cosmology and Astroparticle Physics, Vol: 2021, Pages: 1-14, ISSN: 1475-7516We revisit a mechanism proposed by Hawking to resolve the cosmological constant problem (and the controversy it generated) to identify possibly more palatable alternatives and explore new connections and interpretations. In particular, through the introduction of a new action coupling the four-form field strength F = dA to the cosmological constant via a dynamical field λ(x), a novel Baum-Hawking-Coleman type mechanism is presented. This mechanism can be seen as a generalisation of Unimodular Gravity. A theory with a similar coupling to "F2" is also presented, with promising results. We show how in such theories the 3-form is closely related to the Chern-Simons density, and its associated definition of time. On the interpretational front, we propose a method avoiding the standard Euclidean action prescription, which makes use of Vilenkin's probability flux.
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Journal articleGoodhew H, Jazayeri S, Lee MHG, et al., 2021,
Cutting cosmological correlators
, Journal of Cosmology and Astroparticle Physics, Vol: 2021, ISSN: 1475-7516The initial conditions of our universe appear to us in the form of a classical probability distribution that we probe with cosmological observations. In the current leading paradigm, this probability distribution arises from a quantum mechanical wavefunction of the universe. Here we ask what the imprint of quantum mechanics is on the late time observables. We show that the requirement of unitary time evolution, colloquially the conservation of probabilities, fixes the analytic structure of the wavefunction and of all the cosmological correlators it encodes. In particular, we derive in perturbation theory an infinite set of single-cut rules that generalize the Cosmological Optical Theorem and relate a certain discontinuity of any tree-level n-point function to that of lower-point functions. Our rules are closely related to, but distinct from the recently derived Cosmological Cutting Rules. They follow from the choice of the Bunch-Davies vacuum and a simple property of the (bulk-to-bulk) propagator and are astoundingly general: we prove that they are valid for fields with a linear dispersion relation and any mass, any integer spin and arbitrary local interactions with any number of derivatives. They also apply to general FLRW spacetimes admitting a Bunch-Davies vacuum, including de Sitter, slow-roll inflation, power-law cosmologies and even resonant oscillations in axion monodromy. We verify the single-cut rules in a number of non-trivial examples, including four massless scalars exchanging a massive scalar, as relevant for cosmological collider physics, four gravitons exchanging a graviton, and a scalar five-point function.
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Journal articleAlday F, Argyres P, Lemos M, et al., 2021,
The Pollica perspective on the (super)-conformal world
, JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Vol: 54, ISSN: 1751-8113- Cite
- Citations: 2
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