pinecone/core-2020-05-10-deduplication huggingface dataset:
Integration-by-parts identities in FDR

Four-dimensional renormalized (FDR) integrals play an increasingly important
role in perturbative loop calculations. Thanks to them, loop computations can
be performed directly in four dimensions and with no ultraviolet (UV)
counterterms. In this paper I prove that integration-by-parts (IBP) identities
can be used to find relations among multi-loop FDR integrals. Since algorithms
based on IBP are widely applied beyond one loop, this result represents a
decisive step forward towards the use of FDR in multi-loop calculations.Comment: 13 page
(MS)SM-like models on smooth Calabi-Yau manifolds from all three
  heterotic string theories

We perform model searches on smooth Calabi-Yau compactifications for both the
supersymmetric E8xE8 and SO(32) as well as for the non-supersymmetric
SO(16)xSO(16) heterotic strings simultaneously. We consider line bundle
backgrounds on both favorable CICYs with relatively small h_11 and the Schoen
manifold. Using Gram matrices we systematically analyze the combined
consequences of the Bianchi identities and the tree-level
Donaldson-Uhlenbeck-Yau equations inside the Kahler cone. In order to evaluate
the model building potential of the three heterotic theories on the various
geometries, we perform computer-aided scans. We have generated a large number
of GUT-like models (up to over a few hundred thousand on the various geometries
for the three heterotic theories) which become (MS)SM-like upon using a freely
acting Wilson line. For all three heterotic theories we present tables and
figures summarizing the potentially phenomenologically interesting models which
were obtained during our model scans.Comment: 1+39 pages latex, 4 figures, 16 tables. v3: Scans and statistics for
  the non-supersymmetric models redone in light of the corrected flux
  quantization conditio
Pioneer 10 and 11 Spacecraft Anomalous Acceleration in the light of the
  Nonsymmetric Kaluza-Klein (Jordan-Thiry) Theory

The Nonsymmetric Kaluza-Klein (Jordan-Thiry) Theory leads to a model of a
modified acceleration that can fit an anomalous acceleration experienced by the
Pioneer 10 and 11 spacecraft. The future positions of those spacecrafts are
predicted using distorted hyperbolic orbit. A connection between an anomalous
acceleration and a Hubble constant is solved in the theory together with a
relation to a cosmological constant using a paradigm of modern cosmology. . In
the paper we consider an exact solution of a point mass motion in the Solar
System under an influence of an anomalous acceleration. We find two types of
orbits: periodic and chaotic. Both orbits are bounded. This means there is no
possibility to escape from the Solar System. Some possibilities to avoid this
conclusion are considered. Relativistic effects and a cosmological drifting of
a gravitational constant are considered.The model of an anomalous acceleration
does not cause any contradiction with Solar System observations. We give a full
statistical analysis of the model.Comment: 248 pages,238 figures, some minor changes and extension
Notes on generalized global symmetries in QFT

It was recently argued that quantum field theories possess one-form and
higher-form symmetries, labelled `generalized global symmetries.' In this
paper, we describe how those higher-form symmetries can be understood
mathematically as special cases of more general 2-groups and higher groups, and
discuss examples of quantum field theories admitting actions of more general
higher groups than merely one-form and higher-form symmetries. We discuss
analogues of topological defects for some of these higher symmetry groups,
relating some of them to ordinary topological defects. We also discuss
topological defects in cases in which the moduli `space' (technically, a stack)
admits an action of a higher symmetry group. Finally, we outline a proposal for
how certain anomalies might potentially be understood as describing a
transmutation of an ordinary group symmetry of the classical theory into a
2-group or higher group symmetry of the quantum theory, which we link to WZW
models and bosonization.Comment: 47 pages, LaTeX; v2: references added; v3: more references added; v4:
  added pub info; v5: added referenc
Gravity theory on Poisson manifold with $R$-flux

A novel gravity theory based on Poisson Generalized Geometry is investigated.
A gravity theory on a Poisson manifold equipped with a Riemannian metric is
constructed from a contravariant version of the Levi-Civita connection, which
is based on the Lie algebroid of a Poisson manifold. Then, we show that in
Poisson Generalized Geometry the $R$-fluxes are consistently coupled with such
a gravity. An $R$-flux appears as a torsion of the corresponding connection in
a similar way as an $H$-flux which appears as a torsion of the connection for-
mulated in the standard Generalized Geometry. We give an analogue of the
Einstein-Hilbert action coupled with an $R$-flux, and show that it is invariant
under both $\beta$-diffeomorphisms and $\beta$-gauge transformations.Comment: 37 pages, Some comments and references adde
Splitting Spacetime and Cloning Qubits: Linking No-Go Theorems across
  the ER=EPR Duality

We analyze the no-cloning theorem in quantum mechanics through the lens of
the proposed ER=EPR (Einstein-Rosen = Einstein-Podolsky-Rosen) duality between
entanglement and wormholes. In particular, we find that the no-cloning theorem
is dual on the gravity side to the no-go theorem for topology change, violating
the axioms of which allows for wormhole stabilization and causality violation.
Such a duality between important no-go theorems elucidates the proposed
connection between spacetime geometry and quantum entanglement.Comment: 6 pages, 2 figure
Firewalls as artefacts of inconsistent truncations of quantum geometries

In this paper we argue that a firewall is simply a manifestation of an
inconsistent truncation of non-perturbative effects that unitarize the
semiclassical black hole. Namely, we show that a naive truncation of quantum
corrections to the Hawking spectrum at order ${\cal O}(e^{-S})$, inexorably
leads to a "localised'' divergent energy density near the black hole horizon.
Nevertheless, in the same approximation, a distant observer only sees a
discretised spectrum and concludes that unitarity is achieved by ${\cal
O}(e^{-S})$ effects. This is due to the fact that instead, the correct quantum
corrections to the Hawking spectrum go like ${\cal O}( g^{tt} e^{-S})$.
Therefore, while at a distance far away from the horizon, where $g^{tt}\approx
1$, quantum corrections {\it are} perturbative, they {\it do} diverge close to
the horizon, where $g^{tt}\rightarrow \infty$. Nevertheless, these
"corrections" nicely re-sum so that correlations functions are smooth at the
would-be black hole horizon. Thus, we conclude that the appearance of firewalls
is just a signal of the breaking of the semiclassical approximation at the Page
time, even for large black holes.Comment: v4: explanation about the failure of the saddle point approximation
  and general clarifications adde
Solutions in Exceptional Field Theory

Exceptional Field Theory employs an extended spacetime to make supergravity
fully covariant under the U-duality groups of M-theory. This allows for the
wave and monopole solutions to be combined into a single solution which obeys a
twisted self-duality relation. All fundamental, solitonic and Dirichlet branes
of ten- and eleven-dimensonal supergravity may be extracted from this single
solution in Exceptional Field Theory.Comment: Contribution to the proceedings of the 21st European String Workshop
  "The String Theory Universe" in Leuven, 7-11 Sept 201
Hyperinstantons, the Beltrami Equation, and Triholomorphic Maps

We consider the Beltrami equation for hydrodynamics and we show that its
solutions can be viewed as instanton solutions of a more general system of
equations. The latter are the equations of motion for an ${\cal N}=2$ sigma
model on 4-dimensional worldvolume (which is taken locally HyperK\"ahler) with
a 4-dimensional HyperK\"ahler target space. By means of the 4D twisting
procedure originally introduced by Witten for gauge theories and later
generalized to 4D sigma-models by Anselmi and Fr\'e, we show that the equations
of motion describe triholomophic maps between the worldvolume and the target
space. Therefore, the classification of the solutions to the 3-dimensional
Beltrami equation can be performed by counting the triholomorphic maps. The
counting is easily obtained by using several discrete symmetries. Finally, the
similarity with holomorphic maps for ${\cal N}=2$ sigma on Calabi-Yau space
prompts us to reformulate the problem of the enumeration of triholomorphic maps
in terms of a topological sigma model.Comment: 45 pages, Latex2e, 4 figure
From Stringy Particle Physics to Moduli Stabilisation and Cosmology

Intersecting D6-branes provide a geometrically intuitive road to stringy
particle physics models, where D6-branes stuck at orbifold singularities can
lead to the stabilisation of deformation moduli, and the QCD axion can arise
from the open string sector in a very constrained way compared to pure field
theory. We demonstrate this interplay of different physical features here
through an explicit model.Comment: 4 pages, contribution to the proceedings of "The String Theory
  Universe" Workshop in Leuven, 7-11 Sept 201
The Massless Spectrum of Heterotic Compactifications

We discuss the four-dimensional massless spectrum of supersymmetric Minkowski
compactifications of ten-dimensional heterotic supergravity, including the
anomaly cancelation condition. This can be calculated from restrictions arising
from F-term conditions in a four-dimensional effective theory. The results
agree with computations of the infinitesimal moduli space recently performed
from a ten-dimensional perspective. The paper is based on a talk given by Eirik
Eik Svanes in Leuven for the workshop on "The String Theory Universe".Comment: 2 pages, contribution to the proceedings of "The String Theory
  Universe" Workshop in Leuven, 7-11 Sept 201
Soft Theorems from String Theory

Soft behaviour of closed string amplitudes involving dilatons, gravitons and
anti-symmetric tensors, is studied in the framework of bosonic string theory.
The leading double soft limit of gluons is analysed as well, starting from
scattering amplitudes computed in the open bosonic string. Field theory
expressions are then obtained by sending the string tension to infinity. The
presented results have been derived in the papers of Ref.[1].Comment: 4 pages, contribution to the proceedings of "The String Theory
  Universe" Workshop in Leuven, 7-11 Sept 201
Model building on the non-factorisable type IIA
  $\bf{T^6/(\mathbb{Z}_4\times\Omega\mathcal{R})}$ orientifold

We construct global semi-realistic supersymmetric models with intersecting
D6-branes on the non-factorisable orientifold
$T^6/(\mathbb{Z}_4\times\Omega\mathcal{R})$. The non-factorisable structure
gives rise to differences compared to the factorisable case: additional
conditions for the three-cycles to be Lagrangian and extra constraints on the
wrapping numbers for building fractional cycles.Comment: 2 pages, contribution to the proceedings of "The String Theory
  Universe" workshop in Leuven, 7-11 Sept 201
Deforming D-brane models on $T^6/(\mathbb{Z}_2 \times \mathbb{Z}_{2M})$
  orbifolds

We review the stabilisation of complex structure moduli in Type IIA
orientifolds, especially on $T^6 / (\mathbb{Z}_2 \times \mathbb{Z}_6^\prime
\times \Omega \mathcal{R})$ with discrete torsion, via deformations of
$\mathbb{Z}_2 \times \mathbb{Z}_2$ orbifold singularities. While D6-branes in
SO(2N) and USp(2N) models always preserve supersymmetry and thus give rise to
flat directions, in an exemplary Pati-Salam model with only U(N) gauge groups
ten out of the 15 deformation moduli can be stabilised at the orbifold point.Comment: 2 pages, contribution to the proceedings of "The String Theory
  Universe" workshop in Leuven, 7-11 Sept 201
The general de Sitter supergravity component action

In this paper we review the appearance and utility of a nilpotent chiral
multiplet in the context of supergravity, string theory and cosmology. Coupling
a nilpotent chiral superfield to supergravity, one obtains what is called pure
dS supergravity, a supergravity theory without scalar degrees of freedom that
naturally has de Sitter (dS) solutions, and in which supersymmetry is
non-linearly realized. We extend previous results that couple this dS
supergravity to chiral and vector multiplets and derive the most general
supergravity action for a single nilpotent chiral multiplet coupled to
supergravity and an arbitrary number of chiral and vector multiplets.Comment: 12 pages. Contribution to the proceedings of the 21st European String
  Workshop, Leuven, September 7-11, 201
Holographic impurities and Kondo effect

Magnetic impurities are responsible for many interesting phenomena in
condensed matter systems, notably the Kondo effect and quantum phase
transitions. Here we present a holographic model of a magnetic impurity that
captures the main physical properties of the large-spin Kondo effect. We
estimate the screening length of the Kondo cloud that forms around the impurity
from a calculation of entanglement entropy and show that our results are
consistent with the g-theorem.Comment: 17 pages, 9 figures, Proceedings for COST MP1210 (The String Theory
  Universe) at Leuve
Generalised Geometry and Flux Vacua

This note discusses the connection between generalised geometry and flux
compactifications of string theory. Firstly, we explain in a pedestrian manner
how the supersymmetry constraints of type II ${\mathcal{N}}=1$ flux
compactifications can be restated as integrability constraints on certain
generalised complex structures. This reformulation uses generalised complex
geometry, a mathematical framework that geometrizes the B-field. Secondly, we
discuss how exceptional generalised geometry may provide a similar
geometrization of the RR fields. Thirdly, we examine the connection between
generalised geometry and non-geometry, and finally we present recent
developments where generalised geometry is used to construct explicit examples
of flux compactifications to flat space.Comment: 12 pages, contribution to the proceedings of "The String Theory
  Universe" workshop in Leuven, 7-11 Sept 2015, to be published by Fortschritte
  der Physik; v2: references update
The Typical-State Paradox: Diagnosing Horizons with Complexity

The concept of transparent and opaque horizons is defined. One example of
opaqueness is the presence of a firewall. Two apparently contradictory
statements are reconciled: The overwhelming number of black hole states have
opaque horizons; and: All black holes formed by natural processes have
transparent horizons. A diagnostic is proposed for transparency, namely that
the computational complexity of the state be increasing with time. It is shown
that opaque horizons are extremely unstable and that the slightest perturbation
will make them transparent within a scrambling time.Comment: 18 pages, 7 figure
Double-Trace Deformations and Entanglement Entropy in AdS

We compute the bulk entanglement entropy of a massive scalar field in a
Poincare AdS with the Dirichlet and Neumann boundary condition when we trace
out a half space. Moreover, by taking into account the quantum back reaction to
the minimal surface area, we calculate how much the entanglement entropy
changes under a double-trace deformation of a holographic CFT. In the AdS3/CFT2
setup, our result agrees with the known result in 2d CFTs. In higher
dimensions, our results offer holographic predictions.Comment: 24 pages; v3, a comment and references adde
Entanglement Entropy in a Holographic Kondo Model

We calculate entanglement and impurity entropies in a recent holographic
model of a magnetic impurity interacting with a strongly coupled system. There
is an RG flow to an IR fixed point where the impurity is screened, leading to a
decrease in impurity degrees of freedom. This information loss corresponds to a
volume decrease in our dual gravity model, which consists of a codimension one
hypersurface embedded in a BTZ black hole background in three dimensions. There
are matter fields defined on this hypersurface which are dual to Kondo field
theory operators. In the large N limit, the formation of the Kondo cloud
corresponds to the condensation of a scalar field. The entropy is calculated
according to the Ryu-Takayanagi prescription. This requires to determine the
backreaction of the hypersurface on the BTZ geometry, which is achieved by
solving the Israel junction conditions. We find that the larger the scalar
condensate gets, the more the volume of constant time slices in the bulk is
reduced, shortening the bulk geodesics and reducing the impurity entropy. This
provides a new non-trivial example of an RG flow satisfying the g-theorem.
Moreover, we find explicit expressions for the impurity entropy which are in
agreement with previous field theory results for free electrons. This
demonstrates the universality of perturbing about an IR fixed point.Comment: 26 pages + appendices, 10 figures, v2: This is the pre-peer reviewed
  version of the following article: Fortsch.Phys. 64 (2016) 109-130, which has
  been published in final form at
  http://onlinelibrary.wiley.com/doi/10.1002/prop.201500099/abstrac
Aspects of Quadratic Gravity

We discuss quadratic gravity where terms quadratic in the curvature tensor
are included in the action. After reviewing the corresponding field equations,
we analyze in detail the physical propagating modes in some specific
backgrounds. First we confirm that the pure $R^2$ theory is indeed ghost free.
Then we point out that for flat backgrounds the pure $R^2$ theory propagates
only a scalar massless mode and no spin-two tensor mode. However, the latter
emerges either by expanding the theory around curved backgrounds like de Sitter
or anti-de Sitter, or by changing the long-distance dynamics by introducing the
standard Einstein term. In both cases, the theory is modified in the infrared
and a propagating graviton is recovered. Hence we recognize a subtle interplay
between the UV and IR properties of higher order gravity. We also calculate the
corresponding Newton's law for general quadratic curvature theories. Finally,
we discuss how quadratic actions may be obtained from a fundamental theory like
string- or M-theory. We demonstrate that string theory on non-compact $CY_3$
manifolds, like a line bundle over $\mathbb{CP}^2$, may indeed lead to gravity
dynamics determined by a higher curvature action.Comment: 24 pages, 2 figures, revised version contains additional references
  plus corrected typo
Hodge Numbers for CICYs with Symmetries of Order Divisible by 4

We compute the Hodge numbers for the quotients of complete intersection
Calabi-Yau three-folds by groups of orders divisible by 4. We make use of the
polynomial deformation method and the counting of invariant K\"ahler classes.
The quotients studied here have been obtained in the automated classification
of V. Braun. Although the computer search found the freely acting groups, the
Hodge numbers of the quotients were not calculated. The freely acting groups,
$G$, that arise in the classification are either $Z_2$ or contain $Z_4$, $Z_2
\times Z_2$, $Z_3$ or $Z_5$ as a subgroup. The Hodge numbers for the quotients
for which the group $G$ contains $Z_3$ or $Z_5$ have been computed previously.
This paper deals with the remaining cases, for which $G \supseteq Z_4$ or
$G\supseteq Z_2 \times Z_2$. We also compute the Hodge numbers for 99 of the
166 CICY's which have $Z_2$ quotients.Comment: 95 pages, 54 tables, many colour figure
Supersymmetric M2-branes with Englert Fluxes and the simple group
  PSL(2,7)

A new class is introduced of M2-branes solutions of d=11 supergravity that
include internal fluxes obeying Englert equation in 7-dimensions. A simple
criterion for the existence of Killing spinors in such backgrounds is
established. Englert equation is viewed as the generalization to d=7 of
Beltrami equation defined in d=3 and it is trated accordingly. All 2-brane
solutions of minimal d=7 supergracity can be uplifted to d=11 and have N > 4 or
N = 4 supersymmetry. It is shown that the simple group PSL(2,7) is
crystallographic in d=7 having an integral action on the A7 root lattice. By
means of this point-group and of the T7 torus obtained quotiening R7 with the
A7 root lattice we were able to construct new M2 branes with Englert fluxes and
N < 4. In particular we exhibit here an N=1 solution depending on 4-parameters
and admitting a large non abelian discrete symmetry, namely G21 = Z3 semidirect
product with Z7 = subgroup of PSL(2,7). The dual d=3 field theories have the
same symmetries and have complicated non linear interactions.Comment: 59 pages, two figures. Original Research Article. Few misprints
  corrected, a pair of sentences added in the aknowledgment
Emerging critical behavior at a first-order phase transition rounded by
  disorder

We investigate the two-dimensional four-color Ashkin-Teller model by means of
large-scale Monte-Carlo simulations. We demonstrate that the first-order phase
transition of the clean system is destroyed by random disorder introduced via
site dilution. The critical behavior of the emerging continuous transition
belongs to the clean two-dimensional Ising universality class, apart from
logarithmic corrections. These results confirm perturbative
renormalization-group predictions; they also agree with recent findings for the
three-color case, indicating that the critical behavior is universal.Comment: 6 pages, 5 eps figures included, builds on arXiv:1504.00408, final
  version as publishe
Detecting the Berry curvature in photonic graphene

We describe a method for measuring the Berry curvature from the wave-packet
dynamics in perturbed arrays of evanescently coupled optical waveguides with
honeycomb lattice structure. To disentangle the effects of the Berry curvature
and the energy dispersion we utilize a difference measurement by propagating
the wave packet under the influence of a constant external force back and
forth. In this way a non-vanishing Berry curvature is obtained for photonic
graphene with small sublattice bias or strain, where the relative error between
the exact Berry curvature and the one derived from the semiclassical dynamics
is negligible. For the strained lattice we demonstrate the robustness of the
Berry curvature texture over the Brillouin zone compared to the energy
dispersion. We also comment on the experimental realization of the proposed
Berry curvature mapping in photonics.Comment: 5 pages, 4 figures, revised version, accepted for publication in
  Fortschritte der Physik - Progress of Physics, Special Issue, FQMT15
  Proceeding
Anomalous longitudinal relaxation of nuclear spins in CaF$_2$

We consider the effect of non-secular resonances for interacting nuclear
spins in solids which were predicted theoretically to exist in the presence of
strong static and strong radio-frequency magnetic fields. These resonances
imply corrections to the standard secular approximation for the nuclear
spin-spin interaction in solids, which, in turn, should lead to an anomalous
longitudinal relaxation in nuclear magnetic resonance experiments. In this
article, we investigate the feasibility of the experimental observation of this
anomalous longitudinal relaxation in calcium fluoride (CaF$_2$) and conclude
that such an observation is realistic.Comment: 5 pages, 2 figure
Entanglement and topological interfaces

In this paper we consider entanglement entropies in two-dimensional conformal
field theories in the presence of topological interfaces. Tracing over one side
of the interface, the leading term of the entropy remains unchanged. The
interface however adds a subleading contribution, which can be interpreted as a
relative (Kullback-Leibler) entropy with respect to the situation with no
defect inserted. Reinterpreting boundaries as topological interfaces of a
chiral half of the full theory, we rederive the left/right entanglement entropy
in analogy with the interface case. We discuss WZW models and toroidal bosonic
theories as examples.Comment: 30 pages, 2 figures. References added, typos correcte