pinecone/core-2020-05-10-deduplication huggingface dataset:
Exploring Euclidean Dynamical Triangulations with a Non-trivial Measure
  Term

We investigate a nonperturbative formulation of quantum gravity defined via
Euclidean dynamical triangulations (EDT) with a non-trivial measure term in the
path integral. We are motivated to revisit this older formulation of dynamical
triangulations by hints from renormalization group approaches that gravity may
be asymptotically safe and by the emergence of a semiclassical phase in causal
dynamical triangulations (CDT). We study the phase diagram of this model and
identify the two phases that are well known from previous work: the branched
polymer phase and the collapsed phase. We verify that the order of the phase
transition dividing the branched polymer phase from the collapsed phase is
almost certainly first-order. The nontrivial measure term enlarges the phase
diagram, allowing us to explore a region of the phase diagram that has been
dubbed the crinkled region. Although the collapsed and branched polymer phases
have been studied extensively in the literature, the crinkled region has not
received the same scrutiny. We find that the crinkled region is likely a part
of the collapsed phase with particularly large finite-size effects.
Intriguingly, the behavior of the spectral dimension in the crinkled region at
small volumes is similar to that of CDT, as first reported in arXiv:1104.5505,
but for sufficiently large volumes the crinkled region does not appear to have
4-dimensional semiclassical features. Thus, we find that the crinkled region of
the EDT formulation does not share the good features of the extended phase of
CDT, as we first suggested in arXiv:1104.5505. This agrees with the recent
results of arXiv:1307.2270, in which the authors used a somewhat different
discretization of EDT from the one presented here.Comment: 36 pages, 27 figures. Typos corrected, improved analysis of phase
  transition, and clarifications added. Conclusions unchanged. Conforms with
  version published in JHE
Model-independent production of a top-philic resonance at the LHC

We investigate the collider phenomenology of a color-singlet vector resonance, which couples to the heaviest quarks, the top quarks, but very weakly to the rest of the fermions in the Standard Model. We find that the dominant production of such a resonance does not appear at the tree level — it rather occurs at the one-loop level in association with an extra jet. Signatures like t t ¯ $$ t\overline{t} $$ plus jets readily emerge as a result of the subsequent decay of the resonance into a pair of top quarks. Without the additional jet, the resonance can still be produced off-shell, which gives a sizeable contribution at low masses. The lower top quark multiplicity of the loop induced resonance production facilitates its reconstruction as compared to the tree level production that gives rise to more exotic signatures involving three or even four top quarks in the final state. For all these cases, we discuss the constraints on the resonance production stemming from recent experimental measurements in the top quark sector. We find that the top-philic vector resonance remains largely unconstrained for the majority of the parameter space, although this will be scrutinized closely in the Run 2 phase of the LHC
Entanglement entropy in three dimensional gravity

The Ryu-Takayanagi (RT) and covariant Hubeny-Rangamani-Takayanagi (HRT) proposals relate entanglement entropy in CFTs with holographic duals to the areas of minimal or extremal surfaces in the bulk geometry. We show how, in three dimensional pure gravity, the relevant regulated geodesic lengths can be obtained by writing a spacetime as a quotient of AdS 3 , with the problem reduced to a simple purely algebraic calculation. We explain how this works in both Lorentzian and Euclidean formalisms, before illustrating its use to obtain novel results in a number of examples, including rotating BTZ, the ℝ ℙ 2 $$ \mathrm{\mathbb{R}}{\mathrm{\mathbb{P}}}^2 $$ geon, and several wormhole geometries. This includes spatial and temporal dependence of single-interval entanglement entropy, despite these symmetries being broken only behind an event horizon. We also discuss considerations allowing HRT to be derived from analytic continuation of Euclidean computations in certain contexts, and a related class of complexified extremal surfaces
Towards a field-theory interpretation of bottom-up holography

We investigate recent results for the electrical conductivity and the fermionic self-energy, obtained in a holographic bottom-up model for a relativistic charge-neutral conformal field theory. We present two possible field-theoretic derivations of these results, using either a semiholographic or a holographic point of view. In the semiholographic interpretation, we also show how, in general, the conductivity should be calculated in agreement with Ward identities. The resulting field-theory interpretation may lead to a better understanding of the holographic dictionary in applied AdS/CMT
N=1 superfield description of vector-tensor couplings in six dimensions

We express supersymmetric couplings among the vector and the tensor
multiplets in six dimensions (6D) in terms of N=1 superfields. The superfield
description is derived from the invariant action in the projective superspace.
The obtained expression is consistent with the known superfield actions of 6D
supersymmetric gauge theory and 5D Chern-Simons theory after the dimensional
reduction. Our result provides a crutial clue to the N=1 superfield description
of 6D supergravity.Comment: 28 pages, v2:a reference adde
Small-radius jets to all orders in QCD

As hadron collider physics continues to push the boundaries of precision, it becomes increasingly important to have methods for predicting properties of jets across a broad range of jet radius values R , and in particular for small R . In this paper we resum all leading logarithmic terms, α s n  ln n R 2 , in the limit of small R , for a wide variety of observables. These include the inclusive jet spectrum, jet vetoes for Higgs physics and jet substructure tools. Some of the quantities that we consider are relevant also for heavy-ion collisions. Furthermore, we examine and comment on the underlying order-by-order convergence of the perturbative series for different R values. Our results indicate that small- R effects can be substantial. Phenomenological studies will appear in a forthcoming companion paper
Parton distributions for the LHC run II

We present NNPDF3.0, the first set of parton distribution functions (PDFs) determined with a methodology validated by a closure test. NNPDF3.0 uses a global dataset including HERA-II deep-inelastic inclusive cross-sections, the combined HERA charm data, jet production from ATLAS and CMS, vector boson rapidity and transverse momentum distributions from ATLAS, CMS and LHCb, W + c data from CMS and top quark pair production total cross sections from ATLAS and CMS. Results are based on LO, NLO and NNLO QCD theory and also include electroweak corrections. To validate our methodology, we show that PDFs determined from pseudo-data generated from a known underlying law correctly reproduce the statistical distributions expected on the basis of the assumed experimental uncertainties. This closure test ensures that our methodological uncertainties are negligible in comparison to the generic theoretical and experimental uncertainties of PDF determination. This enables us to determine with confidence PDFs at different perturbative orders and using a variety of experimental datasets ranging from HERA-only up to a global set including the latest LHC results, all using precisely the same validated methodology. We explore some of the phenomenological implications of our results for the upcoming 13 TeV Run of the LHC, in particular for Higgs production cross-sections
Conformal perturbation theory and higher spin entanglement entropy on the torus

We study the free fermion theory in 1+1 dimensions deformed by chemical potentials for holomorphic, conserved currents at finite temperature and on a spatial circle. For a spin-three chemical potential μ , the deformation is related at high temperatures to a higher spin black hole in hs[0] theory on AdS 3 spacetime. We calculate the order μ 2 corrections to the single interval Rényi and entanglement entropies on the torus using the bosonized formulation. A consistent result, satisfying all checks, emerges upon carefully accounting for both perturbative and winding mode contributions in the bosonized language. The order μ 2 corrections involve integrals that are finite but potentially sensitive to contact term singularities. We propose and apply a prescription for defining such integrals which matches the Hamiltonian picture and passes several non-trivial checks for both thermal corrections and the Rényi entropies at this order. The thermal corrections are given by a weight six quasi-modular form, whilst the Rényi entropies are controlled by quasi-elliptic functions of the interval length with modular weight six. We also point out the well known connection between the perturbative expansion of the partition function in powers of the spin-three chemical potential and the Gross-Taylor genus expansion of large- N Yang-Mills theory on the torus. We note the absence of winding mode contributions in this connection, which suggests qualitatively different entanglement entropies for the two systems
Bootstrapping fuzzy scalar field theory

We describe a new way of rewriting the partition function of scalar field theory on fuzzy complex projective spaces as a solvable multitrace matrix model. This model is given as a perturbative high-temperature expansion. At each order, we present an explicit analytic expression for most of the arising terms; the remaining terms are computed explicitly up to fourth order. The method presented here can be applied to any model of hermitian matrices. Our results confirm constraints previously derived for the multitrace matrix model by Polychronakos. A further implicit expectation about the shape of the multitrace terms is however shown not to be true
The landscape of M-theory compactifications on seven-manifolds with G 2 holonomy

We study the physics of globally consistent four-dimensional N $$ \mathcal{N} $$ = 1 super-symmetric M-theory compactifications on G 2 manifolds constructed via twisted connected sum; there are now perhaps fifty million examples of these manifolds. We study a rich example that exhibits U(1) 3 gauge symmetry and a spectrum of massive charged particles that includes a trifundamental. Applying recent mathematical results to this example, we compute the form of membrane instanton corrections to the superpotential and spacetime topology change in a compact model; the latter include both the (non-isolated) G 2 flop and conifold transitions. The conifold transition spontaneously breaks the gauge symmetry to U(1) 2 , and associated field theoretic computations of particle charges make correct predictions for the topology of the deformed G 2 manifold. We discuss physical aspects of the abelian G 2 landscape broadly, including aspects of Higgs and Coulomb branches, membrane instanton corrections, and some general aspects of topology change
Indirect searches for sterile neutrinos at a high-luminosity Z-factory

A future high-luminosity Z -factory will offer the possibility to study rare Z decays, as those leading to lepton flavour violating final states. Processes such as Z  →  ℓ 1 ∓ ℓ 2 ± are potentially complementary to low-energy (high-intensity) observables of lepton flavour violation. In this work we address the impact of new sterile fermions on lepton flavour violating Z decays, focusing on potential searches at FCC-ee (TLEP), and taking into account experimental and observational constraints on the sterile states. We consider a minimal extension of the Standard Model by one sterile fermion state, and two well-motivated frameworks of neutrino mass generation, the Inverse Seesaw embedded into the Standard Model, and the ν MSM. Our study shows that sterile neutrinos can give rise to contributions to BR( Z  →  ℓ 1 ∓ ℓ 2 ± ) within reach of the FCC-ee. We also discuss the complementarity between a high-luminosity Z -factory and low-energy charged lepton flavour violation facilities
Fiber-base duality and global symmetry enhancement

We show that the 5D Nekrasov partition functions enjoy the enhanced global symmetry of the UV fixed point. The fiber-base duality is responsible for the global symmetry enhancement. For SU(2) with N f ≤ 7 flavors the fiber-base symmetry together with the manifest flavor SO(2 N f ) symmetry generate the E N f + 1 $$ {\mathrm{E}}_{N_{f+1}} $$ global symmetry, while in the higher rank case the manifest global symmetry of the two dual theories related by the fiber-base duality map generate the symmetry enhancement. The symmetry enhancement at the level of the partition function is manifest once we chose an appropriate reparametrization for the Coulomb moduli
Lagrangian constraints and renormalization of 4D gravity

It has been proposed in [21] that 4D Einstein gravity becomes effectively reduced to 3D after solving the Lagrangian analogues of the Hamiltonian and momentum constraints of the Hamiltonian quantization. The analysis in [21] was carried out at the classical/operator level. We review the proposal and make a transition to the path integral account. We then set the stage for explicitly carrying out the two-loop renormalization procedure of the resulting 3D action. We also address a potentially subtle issue in the gravity context concerning whether renormalizability does not depend on the background around which the original action is expanded
Think Different: Applying the Old Macintosh Mantra to the Computability
  of the SUSY Auxiliary Field Problem

Starting with valise supermultiplets obtained from 0-branes plus field
redefinitions, valise adinkra networks, and the "Garden Algebra," we discuss an
architecture for algorithms that (starting from on-shell theories and, through
a well-defined computation procedure), search for off-shell completions. We
show in one dimension how to directly attack the notorious "off-shell auxiliary
field" problem of supersymmetry with algorithms in the adinkra network-world
formulation.Comment: 28 pages, 1 figur
$D^6 R^4$ amplitudes in various dimensions

Four-graviton couplings in the low energy effective action of type II string
vacua compactified on tori are strongly constrained by supersymmetry and
U-duality. While the $R^4$ and $D^4 R^4$ couplings are known exactly in terms
of Langlands-Eisenstein series of the U-duality group, the $D^6 R^4$ couplings
are not nearly as well understood. Exploiting the coincidence of the U-duality
group in $D=6$ with the T-duality group in $D=5$, we propose an exact formula
for the $D^6 R^4$ couplings in type II string theory compactified on $T^4$, in
terms of a genus-two modular integral plus a suitable Eisenstein series. The
same modular integral computes the two-loop correction to $D^6 R^4$ in 5
dimensions, but here provides the non-perturbative completion of the known
perturbative terms in $D=6$. This proposal hinges on a systematic re-analysis
of the weak coupling and large radius of the $D^6 R^4$ in all dimensions $D\geq
3$, which fills in some gaps and resolves some inconsistencies in earlier
studies.Comment: 18 pages (+ 26 page appendix), three Mathematica files included with
  submission; v2: minor corrections, version to appear in JHE
New Barr-Zee contributions to $\mathbf{(g-2)_\mu}$ in two-Higgs-doublet
  models

We study the contribution of new sets of two-loop Barr-Zee type diagrams to
the anomalous magnetic moment of the muon within the two-Higgs-doublet model
framework. We show that some of these contributions can be quite sizeable for a
large region of the parameter space and can significantly reduce, and in some
cases even explain, the discrepancy between the theoretical prediction and the
experimentally measured value of this observable. Analytical expressions are
given for all the calculations performed in this work.Comment: 28 pages, 17 figures. Typos corrected. Matches JHEP version. arXiv
  admin note: text overlap with arXiv:1210.8443 by other author
Observable effects of general new scalar particles

We classify all possible new scalar particles that can have renormalizable linear couplings to Standard Model fields and therefore be singly produced at colliders. We show that this classification exhausts the list of heavy scalar particles that contribute at the tree level to the Standard Model effective Lagrangian to dimension six. We compute this effective Lagrangian for a general scenario with an arbitrary number of new scalar particles and obtain flavor-preserving constraints on their couplings and masses. This completes the tree-level matching of the coefficients of dimension five and six operators in the effective Lagrangian to arbitrary extensions of the Standard Model
Identifying boosted new physics with non-isolated leptons

We demonstrate the utility of leptons which fail standard isolation criteria in searches for new physics at the LHC. Such leptons can arise in any event containing a highly boosted particle which decays to both leptons and quarks. We begin by considering multiple extensions to the Standard Model which primarily lead to events with non-isolated leptons and are therefore missed by current search strategies. We emphasize the failure of standard isolation variables to adequately discriminate between signal and SM background for any value of the isolation cuts. We then introduce a new approach which makes use of jet substructure techniques to distinguish a broad range of signals from QCD events. We proceed with a simulated, proof-of-principle search for R -parity violating supersymmetry to demonstrate both the experimental reach possible with the use of non-isolated leptons and the utility of new substructure variables over existing techniques
Spectral functions in V-QCD with matter: masses, susceptibilities, diffusion and conductivity

We consider a holographic model of QCD in the Veneziano limit of a large number of colors N c and flavors N f but fixed x = N f /N c (V-QCD). The model exhibits a first order deconfined but chirally broken transition, followed by a second order chirally restored transition in the μ − T plane for a range of plausible holographic parameters. We study the quasi-normal mode spectrum, and derive the pertinent vector and axial spectral functions across the transition regions. The pole masses, susceptibilities, diffusion constants and electric conductivity are also discussed. In particular, the pole masses are found to survive the deconfining transition, to quickly dissolve in the the chirally restored phase by developing substantial widths. The flavor electric conductivities arise sharply in the transition region. The flavor susceptibility is shown to be consistent with the one derived from bulk thermodynamics
Gauge Symmetries and Holographic Anomalies of Chern-Simons and
  Transgression AdS Gravity

We review the issue of gauge and gravitational anomalies with backgrounds,
maybe offering a new outlook on some aspects of these questions.
  We compute the holographic anomalies of hypothetical theories dual, in the
sense of the AdS-CFT correspondence, to Chern-Simons AdS gravities. Those
anomalies are either gauge anomalies associated to the AdS gauge group of the
theory or diffeomorphism anomalies, with each kind related to the other.
  As a result of using suitable action principles por Chern-Simons AdS
gravities, coming from Transgression forms, we obtain finite results without
the need for further regularization.
  Our results are of potential interest for Lovelock gravity theories, as it
has been shown that the boundary terms dictated by the transgressions for
Chern-Simons gravities are also suitable to regularize Lovelock theories. The
Wess-Zumino consistency condition ensures that anomalies of the generic form
computed here should appear for these and other theories.Comment: This work and arXiv:1407.6032 started as a rewritting of
  arXiv:1010.5110 (which was not published in a journal), therefore there may
  may be some ovelap in the review section
R\'enyi entropy of locally excited states with thermal and boundary
  effect in 2D CFTs

We study R\'enyi entropy of locally excited states with considering the
thermal and boundary effects respectively in two dimensional conformal field
theories (CFTs). Firstly we consider locally excited states obtained by acting
primary operators on a thermal state in low temperature limit. The R\'enyi
entropy is summation of contribution from thermal effect and local excitation.
Secondly, we mainly study the R\'enyi entropy of locally excited states in 2D
CFT with a boundary. We show that the evolution of R\'enyi entropy does not
depend on the choice of boundary conditions and boundary will change the time
evolution of R\'enyi entropy. Moreover, in 2D rational CFTs with a boundary, we
show that the R\'enyi entropy always coincides with the log of quantum
dimension of the primary operator during some periods of the evolution. We make
use of a quasi-particle picture to understand this phenomenon. In terms of
quasi-particle interpretation, the boundary behaves as an infinite potential
barrier which reflects any energy moving towards the boundary.Comment: Published versio
Duality and Modularity in Elliptic Integrable Systems and Vacua of N=1*
  Gauge Theories

We study complexified elliptic Calogero-Moser integrable systems. We
determine the value of the potential at isolated extrema, as a function of the
modular parameter of the torus on which the integrable system lives. We
calculate the extrema for low rank B,C,D root systems using a mix of analytical
and numerical tools. For so(5) we find convincing evidence that the extrema
constitute a vector valued modular form for a congruence subgroup of the
modular group. For so(7) and so(8), the extrema split into two sets. One set
contains extrema that make up vector valued modular forms for congruence
subgroups, and a second set contains extrema that exhibit monodromies around
points in the interior of the fundamental domain. The former set can be
described analytically, while for the latter, we provide an analytic value for
the point of monodromy for so(8), as well as extensive numerical predictions
for the Fourier coefficients of the extrema. Our results on the extrema provide
a rationale for integrality properties observed in integrable models, and embed
these into the theory of vector valued modular forms. Moreover, using the data
we gather on the modularity of complexified integrable system extrema, we
analyse the massive vacua of mass deformed N=4 supersymmetric Yang-Mills
theories with low rank gauge group of type B,C and D. We map out their
transformation properties under the infrared electric-magnetic duality group as
well as under triality for N=1* with gauge algebra so(8). We find several
intriguing properties of the quantum gauge theories.Comment: 35 pages, many figure
Static $\bar{Q}Q$ pair free energy and screening masses from correlators
  of Polyakov loops: continuum extrapolated lattice results at the QCD physical
  point

We study the correlators of Polyakov loops, and the corresponding gauge
invariant free energy of a static quark-antiquark pair in 2+1 flavor QCD at
finite temperature. Our simulations were carried out on $N_t$ = 6, 8, 10, 12,
16 lattices using Symanzik improved gauge action and a stout improved staggered
action with physical quark masses. The free energies calculated from the
Polyakov loop correlators are extrapolated to the continuum limit. For the free
energies we use a two step renormalization procedure that only uses data at
finite temperature. We also measure correlators with definite Euclidean time
reversal and charge conjugation symmetry to extract two different screening
masses, one in the magnetic, and one in the electric sector, to distinguish two
different correlation lengths in the full Polyakov loop correlator