pinecone/core-2020-05-10-deduplication huggingface dataset:
Decoupling and de Sitter vacua in approximate no-scale supergravities

We study N=1 supergravity with N>1 chiral superfields in which one of the fields has a K\"ahler potential of exact no-scale type. Such systems admit de Sitter (dS) solutions in which supersymmetry is predominantly broken by the no-scale field, with only a small contribution to the breaking coming from the other fields. Metastable dS vacua of this type were recently shown to be achievable by the finetuning of an N×N sub-matrix of the Hessian matrix at the critical point. We show that perturbatively small deformations of the no-scale Minkowski vacuum into dS are only possible when the spectrum of the no-scale vacuum, besides the no-scale field, contain an additional massless mode. The no-scale structure allows for a decoupling of N−2 fields, and metastability can be achieved by the tuning of (N0) parameters. We illustrate this scenario in several examples, and derive a geometric condition for its realisation in type IIB string theory. Supergravities in which the complex structure moduli space is a symmetric space, such as the string theory inspired STU-models, are non-generic and realise a modified version of the scenario. For the STU-model with a single non-perturbative correction we present an explicit analytic family of dS solutions that includes examples with quantised fluxes satisfying the O3-plane tadpole condition.status: publishe
Restoration of supersymmetry in two-dimensional SYM with sixteen
  supercharges on the lattice

We perform lattice simulations of two-dimensional supersymmetric Yang-Mills
theory with sixteen supercharges with a lattice action which has two exact
supercharges (Sugino lattice action). According to the gauge/gravity duality,
the theory at finite temperature is expected to be well described by the
corresponding black 1-branes, at low temperature in the large N limit. We aim
to confirm the duality conjecture by comparing the lattice results with the
theoretical predictions obtained in the gravity side. In this article, at the
beginning of this study, we examine the supersymmetric Ward-Takahashi identity
to test whether the lattice action reproduces the correct continuum theory.
Numerical results of the SUSY WTI strongly suggest us that any cut-off effects,
which break supersymmetry, disappear in the continuum limit. In addition, we
study the issue of degenerate vacua and find that the admissiblilty condition
or any other constraints of the link fields which guarantee the unique vacuum
are not always needed.Comment: 25 pages, 6 figures, 3 table
M-theory moduli spaces and torsion-free structures

24 pages. Typos fixed. Minor clarifications addedInternational audienceMotivated by the description of $\mathcal{N}=1$ M-theory compactifications to four-dimensions given by Exceptional Generalized Geometry, we propose a way to geometrize the M-theory fluxes by appropriately relating the compactification space to a higher-dimensional manifold equipped with a torsion-free structure. As a non-trivial example of this proposal, we construct a bijection from the set of $Spin(7)$-structures on an eight-dimensional $S^{1}$-bundle to the set of $G_{2}$-structures on the base space, fully characterizing the $G_{2}$-torsion clases when the total space is equipped with a torsion-free $Spin(7)$-structure. Finally, we elaborate on how the higher-dimensional manifold and its moduli space of torsion-free structures can be used to obtain information about the moduli space of M-theory compactifications
Double beta decay and neutrino mass models

Neutrinoless double beta decay allows to constrain lepton number violating
extensions of the standard model. If neutrinos are Majorana particles, the mass
mechanism will always contribute to the decay rate, however, it is not a priori
guaranteed to be the dominant contribution in all models. Here, we discuss
whether the mass mechanism dominates or not from the theory point of view. We
classify all possible (scalar-mediated) short-range contributions to the decay
rate according to the loop level, at which the corresponding models will
generate Majorana neutrino masses, and discuss the expected relative size of
the different contributions to the decay rate in each class. Our discussion is
general for models based on the SM group but does not cover models with an
extended gauge. We also work out the phenomenology of one concrete 2-loop model
in which both, mass mechanism and short-range diagram, might lead to
competitive contributions, in some detail.Comment: 39 pages, 18 figures. Minor comments added. Matches published versio
Non-thermal CMSSM with a 125 GeV Higgs

We study the phenomenology of the CMSSM/mSUGRA with non-thermal neutralino dark matter. Besides the standard parameters of the CMSSM we include the reheating temperature as an extra parameter. Imposing radiative electroweak symmetry breaking with a Higgs mass around 125 GeV and no dark matter overproduction, we contrast the scenario with different experimental bounds from colliders (LEP, LHC), cosmic microwave background (Planck), direct (LUX, XENON100, CDMS, IceCube) and indirect (Fermi) dark matter searches. The allowed parameter space is characterised by a Higgsino-like LSP with a mass around 300 GeV. The observed dark matter abundance can be saturated for reheating temperatures around 2GeV while larger temperatures require extra non-neutralino dark matter candidates and extend the allowed parameter space. Sfermion and gluino masses are in the few TeV region. These scenarios can be achieved in string models of sequestered supersymmetry breaking which avoid cosmological moduli problems and are compatible with gauge coupling unification. Astrophysics and particle physics experiments will fully investigate this non-thermal scenario in the near future
An algorithm for the Baker-Campbell-Hausdorff formula

A simple algorithm, which exploits the associativity of the BCH formula, and
that can be generalized by iteration, extends the remarkable simplification of
the Baker-Campbell-Hausdorff (BCH) formula, recently derived by Van-Brunt and
Visser. We show that if
  $[X,Y]=uX+vY+cI$, $[Y,Z]=wY+zZ+dI$, and, consistently with the Jacobi
identity, $[X,Z]=mX+nY+pZ+eI$, then $$
\exp(X)\exp(Y)\exp(Z)=\exp({aX+bY+cZ+dI}) $$ where $a$, $b$, $c$ and $d$ are
solutions of four equations. In particular, the Van-Brunt and Visser formula
$$\exp(X)\exp(Z)=\exp({aX+bZ+c[X,Z]+dI}) $$ extends to cases when $[X,Z]$
contains also elements different from $X$ and $Z$. Such a closed form of the
BCH formula may have interesting applications both in mathematics and physics.
As an application, we provide the closed form of the BCH formula in the case of
the exponentiation of the Virasoro algebra, with ${\rm SL}_2({\rm C})$
following as a subcase. We also determine three-dimensional subalgebras of the
Virasoro algebra satisfying the Van-Brunt and Visser condition. It turns out
that the exponential form of ${\rm SL}_2({\rm C})$ has a nice representation in
terms of its eigenvalues and of the
  fixed points of the corresponding M\"obius transformation. This may have
applications in Uniformization theory and Conformal Field Theories.Comment: 1+8 pages. Comments and refences added. Typos corrected. Version to
  appear in JHE
Abelian Hypermultiplet Gaugings and BPS Vacua in N = 2 Supergravity

We analyze the gauging of Abelian isometries on the hypermultiplet scalar
manifolds of N = 2 supergravity in four dimensions. This involves a study of
symmetric special quaternionic-K\"ahler manifolds, building on the work of de
Wit and Van Proeyen. In particular we compute the general set of Killing
prepotentials and associated compensators for these manifolds manifolds. This
allows us to glean new insights about AdS 4 vacua which preserve the full N = 2
supersymmetry as well as BPS static black hole horizons.Comment: 22 p. (+ 14 app.); v2: published version, fix minor typos and Killing
  prepotential expression
Improved extraction of valence transversity distributions from inclusive dihadron production

We present an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets make it possible to perform a flavor separation of the valence components of the transversity distribution, using di-hadron fragmentation functions taken from the semi-inclusive production of two pion pairs in back-to-back jets in e + e − annihilation. The e + e − data from Belle have been reanalyzed using the replica method and a more realistic estimate of the uncertainties on the chiral-odd interference fragmentation function has been obtained. Then, the transversity distribution has been extracted by using the most recent and more precise COMPASS data for deep-inelastic scattering off proton targets. Our results represent the most accurate estimate of the uncertainties on the valence components of the transversity distribution currently available
Finite quark-mass effects in the NNLOPS POWHEG+MiNLO Higgs generator

We include finite top- and bottom-mass effects in the next-to-next-to-leading order parton shower (NNLOPS) event generator for inclusive Higgs boson production in gluon fusion based upon the POWHEG+MiNLO approach. Since fixed-order results for quark-mass effects only reach NLO accuracy, we add them to the NNLOPS generator at that accuracy. We explore uncertainties related to the unknown all-order logarithmic structure of bottom-mass effects by comparing the assumption of full exponentiation to no exponentiation at all. Phenomenological results showing the effects of finite quark-masses in the NNLOPS simulation are presented. These suggest that the aforementioned uncertainty is well contained within the envelope of plain renormalization and factorization scale uncertainties
Truncation effects in the functional renormalization group study of spontaneous symmetry breaking

We study the occurrence of spontaneous symmetry breaking (SSB) for O ( N ) models using functional renormalization group techniques. We show that even the local potential approximation (LPA) when treated exactly is sufficient to give qualitatively correct results for systems with continuous symmetry, in agreement with the Mermin-Wagner theorem and its extension to systems with fractional dimensions. For general N (including the Ising model N = 1) we study the solutions of the LPA equations for various truncations around the zero field using a finite number of terms (and different regulators), showing that SSB always occurs even where it should not. The SSB is signalled by Wilson-Fisher fixed points which for any truncation are shown to stay on the line defined by vanishing mass beta functions
Regge behavior saves string theory from causality violations

Higher-derivative corrections to the Einstein-Hilbert action are present in bosonic string theory leading to the potential causality violations recently pointed out by Camanho et al. [1]. We analyze in detail this question by considering high-energy string-brane collisions at impact parameters b ≤ l s (the string-length parameter) with l s ≫ R p (the characteristic scale of the D p -brane geometry). If we keep only the contribution of the massless states causality is violated for a set of initial states whose polarization is suitably chosen with respect to the impact parameter vector. Such violations are instead neatly avoided when the full structure of string theory — and in particular its Regge behavior — is taken into account
Center of Mass Energy of the Collision for Two General Geodesic
  Particles Around a Kerr-Newman-Taub-NUT Black Hole

In this paper, we investigate the center of mass energy of the collision for
two neutral particles with different rest masses falling freely from rest at
infinity in the background of a Kerr-Newman-Taub-NUT black hole. Further, we
discuss the center of mass energy near the horizon(s) of an extremal and
non-extremal Kerr-Newman-Taub-NUT black hole and show that an arbitrarily high
center of mass energy is achievable under some restrictions. We will study the
special case of the center of mass energy when the specific energy, specific
angular momentum and Carter constant of both the particles are same.Comment: 23 pages, 7 figures, 2 tables, Accepted in JHE
A journey to 3d: exact relations for adjoint SQCD from dimensional reduction

18 pages, appendix added on the large mass scaling of the partition function, version published in JHEPInternational audienceIn this note we elaborate on the reduction of four dimensional Seiberg duality with adjoint matter to three dimensions. We use the exact formulation of the superconformal index and of the partition function as instruments to test this reduction. We translate the identity between indices of the dual 4d theories to 3d. This produces various new identities between partition functions of 3d dual phases
Superspace formulation of the local RG equation

We present the superspace formulation of the local RG equation, a framework for the study of supersymmetric RG flows in which the constraints of holomorphy and R -symmetry are manifest. We derive the consistency conditions associated with super-Weyl symmetry off-criticality and initiate the study of their implications. As examples, we derive an expression for the a -function, and present an analog of the a -maximization equation, which is valid off-criticality. We also apply this machinery to the study of conformal manifolds and give a simple proof that the metric on such manifolds is Kähler
The m W − m Z interdependence in the Standard Model: a new scrutiny

The m W − m Z interdependence in the Standard Model is studied in the M S ¯ $$ \overline{M\ S} $$ scheme at the two-loop level, including the known higher-order contributions. The relevant radiative parameters, Δ α ^ μ $$ \varDelta \widehat{\alpha}\left(\mu \right) $$ , Δ r ^ W $$ \varDelta {\widehat{r}}_W $$ , ρ ^ $$ \widehat{\rho} $$ are computed at O ( α 2 ) taking into account higherorder QCD corrections and the resummation of the reducible contributions. We obtain m W = 80 . 357 ± 0 . 009 ± 0 . 003 GeV where the errors refer to the parametric and theoretical uncertainties, respectively. A comparison with the known result in the On-Shell scheme gives a difference of ≈ 6 MeV. As a byproduct of our calculation we also obtain the M S ¯ $$ \overline{M\ S} $$ electromagnetic coupling and the weak mixing angle at the top mass scale, α ^ M t = 127.73 − 1 ± 0.0000003 $$ \widehat{\alpha}\left({M}_t\right)={(127.73)}^{-1}\pm 0.0000003 $$ and sin 2 θ ^ W M t = 0.23462 ± 0.00012 $$ { \sin}^2{\widehat{\theta}}_W\left({M}_t\right)=0.23462\pm 0.00012 $$
On conserved charges and thermodynamics of the AdS$_{4}$ dyonic black
  hole

Four-dimensional gravity in the presence of a dilatonic scalar field and an
Abelian gauge field is considered. This theory corresponds to the bosonic
sector of a Kaluza-Klein dimensional reduction of eleven-dimensional
supergravity which induces a determined self-interacting potential for the
scalar field. We compute the conserved charges and carry out the thermodynamics
of an anti-de Sitter (AdS) dyonic black hole solution recently proposed. The
charges coming from symmetries of the action are computed by using the
Regge-Teitelboim Hamiltonian approach. These correspond to the mass, which
acquires contributions from the scalar field, and the electric charge.
Integrability conditions are introduced because the scalar field leads to
non-integrable terms in the variation of the mass. These conditions are
generically solved by introducing boundary conditions that arbitrarily relates
the leading and subleading terms of the scalar field fall-off. The Hamiltonian
Euclidean action, computed in the grand canonical ensemble, is obtained by
demanding the action to attain an extremum. Its value is given by a radial
boundary term plus an additional polar angle boundary term due to the presence
of a magnetic monopole. Remarkably, the magnetic charge can be identified from
the variation of the additional polar angle boundary term, confirming that the
first law of black hole thermodynamics is a consequence of having a
well-defined and finite Hamiltonian action principle, even if the charge does
not come from a symmetry of the action. The temperature and electrostatic
potential are determined demanding regularity on the black hole solution,
whereas the value of the magnetic potential is already identified in the
variation of the additional polar angle boundary term. Consequently, the first
law of black hole thermodynamics is identically satisfied by construction.Comment: 19 pages, no figure
Flavor constraints on the Two Higgs Doublet Models of $Z_2$ symmetric
  and aligned types

We give a comprehensive study from flavor observables of pion, kaon, D_(s),
and B_(s) mesons for limiting the Two Higgs Doublet Models (2HDMs) with natural
flavor conservation, namely, Z_2 symmetric and aligned type of models. With use
of the updated studies and analyses of B -> tau nu, D -> mu nu, D_s -> tau nu,
D_s -> mu nu, K -> mu nu, Pi -> mu nu, B^0_s -> mu^+ mu^-, B^0_d -> mu^+ mu^-,
tau -> K nu, tau -> Pi nu, B -> X_s gamma, K-K bar mixing, B^0_d-B^0_d bar
mixing, and B^0_s-B^0_s bar mixing, we obtain constraints on the parameters in
the 2HDMs. To calculate the constraints, we pay attention to a determination of
CKM matrix elements and re-fit them to experimental data so that new
contributions from additional Higgs bosons do not affect the determination. In
addition, we discuss excesses of observables in the muon anomalous magnetic
moment and the semi-tauonic B meson decays in the context of the 2HDM.Comment: 44pages, 7figures, references added, figure refined, published
  versio
An Action for Matter Coupled Higher Spin Gravity in Three Dimensions

We propose a covariant Hamiltonian action for the Prokushkin and Vasiliev's
matter coupled higher spin gravity in three dimensions. The action is
formulated on ${\cal X}_4 \times {\cal Z}_2$ where ${\cal X}_4$ is an open
manifold whose boundary contains spacetime and ${\cal Z}_2$ is a noncommutative
twistor space. We examine various consistent truncations to models of BF type
in ${\cal X}_4$ and ${\cal Z}_2$ with B$^2$ terms and central elements. They
are obtained by integrating out the matter fields in the presence of a vacuum
expectation value $\nu\in \mathbb{R}$ for the zero-form master field. For
$\nu=0$, we obtain a model on ${\cal X}_4$ containing Blencowe's action and a
model on ${\cal Z}_2$ containing the Prokushkin--Segal--Vasiliev action. For
generic $\nu$ (including $\nu=0$), we propose an alternative model on ${\cal
X}_4$ with gauge fields in the Weyl algebra of Wigner's deformed oscillator
algebra and Lagrange multipliers in the algebra of operators acting in the Fock
representation space of the deformed oscillators.Comment: 33 + 1 pages, no figure. Minor typos correcte
A toy model of black hole complementarity

We consider the algebra of simple operators defined in a time band in a CFT
with a holographic dual. When the band is smaller than the light crossing time
of AdS, an entire causal diamond in the center of AdS is separated from the
band by a horizon. We show that this algebra obeys a version of the
Reeh-Schlieder theorem: the action of the algebra on the CFT vacuum can
approximate any low energy state in the CFT arbitrarily well, but no operator
within the algebra can exactly annihilate the vacuum. We show how to relate
local excitations in the complement of the central diamond to simple operators
in the band. Local excitations within the diamond are invisible to the algebra
of simple operators in the band by causality, but can be related to complicated
operators called "precursors". We use the Reeh-Schlieder theorem to write down
a simple and explicit formula for these precursors on the boundary. We comment
on the implications of our results for black hole complementarity and the
emergence of bulk locality from the boundary.Comment: 24 page
$\mathcal{N}=2$ Supersymmetric Janus Solutions and Flows: From Gauged
  Supergravity to M Theory

We investigate a family of SU(3)$\times$U(1)$\times$U(1)-invariant
holographic flows and Janus solutions obtained from gauged $\mathcal{N}=8$
supergravity in four dimensions. We give complete details of how to use the
uplift formulae to obtain the corresponding solutions in M theory. While the
flow solutions appear to be singular from the four-dimensional perspective, we
find that the eleven-dimensional solutions are much better behaved and give
rise to interesting new classes of compactification geometries that are smooth,
up to orbifolds, in the infra-red limit. Our solutions involve new phases in
which M2 branes polarize partially or even completely into M5 branes. We derive
the eleven-dimensional supersymmetries and show that the eleven-dimensional
equations of motion and BPS equations are indeed satisfied as a consequence of
their four-dimensional counterparts. Apart from elucidating a whole new class
of eleven-dimensional Janus and flow solutions, our work provides extensive and
highly non-trivial tests of the recently-derived uplift formulae.Comment: 57 pages, 4 figure
New Bi-Gravity from New Massive Garvity

Using the action of three dimensional New Massive Gravity (NMG) we construct
a new bi-gravity in three dimensions. This can be done by promoting the rank
two auxiliary field appearing in the expression of NMG's action into a
dynamical field. We show that small fluctuations around the AdS vacuum of the
model are non-tachyonic and ghost free within certain range of the parameters
of the model. We study central charges of the dual field theory and observe
that in this range they are positive too. This suggests that the proposed model
might be a consistent three dimensional bi-gravity.Comment: 28 pages, 2 figures, two appendices are added, typos fixed, journal
  versio
Lepton Mixing Predictions from Infinite Group Series $D^{(1)}_{9n, 3n}$
  with Generalized CP

We have performed a comprehensive analysis of the type D group $D^{(1)}_{9n,
3n}$ as flavor symmetry and the generalized CP symmetry. All possible residual
symmetries and their consequences for the prediction of the mixing parameters
are studied. We find that only one type of mixing pattern is able to
accommodate the measured values of the mixing angles in both "direct" and
"variant of semidirect" approaches, and four types of mixing patterns are
phenomenologically viable in the "semidirect" approach. The admissible values
of the mixing angles as well as CP violating phases are studied in detail for
each case. It is remarkable that the first two smallest $D^{(1)}_{9n,3n}$
groups with $n=1, 2$ can fits the experimental data very well. The
phenomenological predictions for neutrinoless double beta decay are discussed.Comment: 63 pages, 18 figure
Event-by-event fluctuations in the medium-induced jet evolution

We develop the event-by-event picture of the gluon distribution produced via
medium-induced gluon branching by an energetic jet which propagates through a
dense QCD medium. A typical event is characterized by the production of a large
number of soft gluons which propagate at large angles with respect to the jet
axis and which collectively carry a substantial amount of energy. By explicitly
computing 2-gluon correlations, we demonstrate the existence of large
event-by-event fluctuations, which reflect the stochastic nature of the
branching process. For the two quantities that we have investigated -- the
energy loss at large angles and the soft gluon multiplicity --, the dispersion
is parametrically as large as the respective expectation value. We identify
interesting scaling laws, which suggest that the multiplicity distribution
should exhibit KNO (Koba-Nielsen-Olesen) scaling. A similar scaling is known to
hold for a jet branching in the vacuum, but the medium-induced distribution is
found to be considerably broader. We predict that event-by-event measurements
of the di-jet asymmetry in Pb+Pb collisions at the LHC should observe large
fluctuations in the number of soft hadrons propagating at large angles and also
in the total energy carried by these hadrons.Comment: 39 pages, 7 figure