High Energy Physics  Theory
New submissions
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New submissions for Mon, 25 Sep 17
 [1] arXiv:1709.07453 [pdf, other]

Title: When Rational Sections Become Cyclic: Gauge Enhancement in Ftheory via MordellWeil TorsionComments: 51 pagesSubjects: High Energy Physics  Theory (hepth)
We explore novel gauge enhancements from abelian to nonsimplyconnected gauge groups in Ftheory. To this end we consider complex structure deformations of elliptic fibrations with a MordellWeil group of rank one and identify the conditions under which the generating section becomes torsional. For the specific case of Z2 torsion we construct the generic solution to these conditions and show that the associated Ftheory compactification exhibits the global gauge group [SU(2) x SU(4)]/Z2 x SU(2). The subsolution with gauge group SU(2)/Z2 x SU(2), for which we provide a global resolution, is related by a further complex structure deformation to a genusone fibration with a bisection whose Jacobian has a Z2 torsional section. While an analysis of the spectrum on the Jacobian fibration reveals an SU(2)/Z2 x Z2 gauge theory, reproducing this result from the bisection geometry raises some conceptual puzzles about Ftheory on genusone fibrations.
 [2] arXiv:1709.07564 [pdf, ps, other]

Title: Higher spin matrix modelsAuthors: Mauricio ValenzuelaComments: 12 pages, 1 tableSubjects: High Energy Physics  Theory (hepth)
We propose a hybrid class of theories for higher spin gravity and matrix models, i.e. which handle simultaneously higher spin gravity fields and matrix models. The construction is similar to Vasiliev's higher spin gravity but part of the equations of motion are provided by the action principle of a matrix model. In particular we construct a higher spin (gravity) matrix model related to type IIB matrix models/string theory which have a well defined classical limit, and which is compatible with higher spin gravity in $AdS$ space. As it has been suggested that higher spin gravity should be related to string theory in a high energy (tensionless) regime, and therefore to MTheory, we expect that our construction will be useful to explore concrete connections.
 [3] arXiv:1709.07613 [pdf, other]

Title: SYK Model, Chaos and Conserved ChargeComments: 18pages, 4 figuresSubjects: High Energy Physics  Theory (hepth)
We study the SYK model with complex fermions, in the presence of an alltoall $q$body interaction, with a nonvanishing chemical potential. We find that, in the large $q$ limit, this model can be solved exactly and the corresponding Lyapunov exponent can be obtained semianalytically. The resulting Lyapunov exponent is a sensitive function of the chemical potential $\mu$. Even when the coupling $J$, which corresponds to the disorder averaged values of the all to all fermion interaction, is large, values of $\mu$ which are exponentially small compared to $J$ lead to suppression of the Lyapunov exponent.
 [4] arXiv:1709.07647 [pdf, ps, other]

Title: Asymptotic symmetries and geometry on the boundary in the first order formalismAuthors: Yegor KorovinSubjects: High Energy Physics  Theory (hepth); General Relativity and Quantum Cosmology (grqc)
Proper understanding of the geometry on the boundary of a spacetime is a critical step on the way to extending holography to spaces with nonAdS asymptotics. In general the boundary cannot be described in terms of the Riemannian geometry and the first order formalism is more appropriate as we show. We analyze the asymptotic symmetries in the first order formalism for large classes of theories on AdS, Lifshitz or flat space. In all cases the asymptotic symmetry algebra is realized on the first order variables as a gauged symmetry algebra. First order formalism geometrizes and simplifies the analysis. We apply our framework to the issue of scale versus conformal invariance in AdS/CFT and obtain new perspective on the structure of asymptotic expansions for AdS and flat spaces.
 [5] arXiv:1709.07659 [pdf, ps, other]

Title: Cohomogeneityonestring integrability of spacetimesSubjects: High Energy Physics  Theory (hepth)
We present a framework for reducing all possible cohomogeneityone strings, i.e., strings with geometrical symmetry, in a given spacetime to mechanical systems, and for analyzing integrability of the systems. As applications, it is clarified whether the systems of cohomogeneityone strings in $AdS_5$, $AdS_5 \times S^5$, and $AdS_5 \times T^{p,q}$ are integrable or not. This method may reveal a different type of hidden symmetry of spacetimes.
 [6] arXiv:1709.07844 [pdf, other]

Title: Multifractional spacetimes from the Standard Model to cosmologyAuthors: Gianluca CalcagniComments: 14 pages, 1 figure, 4 tables. In Proceedings of the XXV International Fall Workshop on Geometry and Physics (IFWGP), August 29  September 02, 2016, Madrid, SpainSubjects: High Energy Physics  Theory (hepth); General Relativity and Quantum Cosmology (grqc)
We review recent theoretical progress and observational constraints on multifractional spacetimes, geometries that change with the probed scale. On the theoretical side, the basic structure of the Standard Model and of the gravitational action is discussed. On the experimental side, we recall the bounds on the scales of the geometry coming from particle physics, astrophysics, and the cosmic microwave background.
 [7] arXiv:1709.07866 [pdf, other]

Title: Massless Spectra and Gauge Couplings at OneLoop on NonFactorisable Toroidal OrientifoldsComments: 64 pages, 10 figuresSubjects: High Energy Physics  Theory (hepth)
Socalled `nonfactorisable' toroidal orbifolds can be rewritten in a factorised form as a product of three twotori by imposing an additional shift symmetry. This finding of Blaszczyk et al. [Blaszczyk:2011hs] provides a new avenue to Conformal Field Theory methods, by which the vectorlike massless matter spectrum  and thereby the type of gauge group enhancement on orientifold invariant fractional D6branes  and the oneloop corrections to the gauge couplings in Type IIA orientifold theories can be computed in addition to the wellestablished chiral matter spectrum derived from topological intersection numbers among threecycles. We demonstrate this framework for the $\Z_4 \times \OR$ orientifolds on the $A_3 \times A_1 \times B_2$type torus. As observed before for factorisable backgrounds, also here the oneloop correction can drive the gauge groups to stronger coupling as demonstrated by means of a fourgeneration PatiSalam example.
 [8] arXiv:1709.07872 [pdf, other]

Title: Embedding threedimensional bosonization dualities into string theoryComments: 23 pages, 2 figuresSubjects: High Energy Physics  Theory (hepth)
We give simple string theory embeddings of several recently introduced dualities between 2+1dimensional ChernSimons matter theories using probe brane holography. Our construction is reliable in the limit of a large number of colors $N$ with fixed ChernSimons level $k$.
Crosslists for Mon, 25 Sep 17
 [9] arXiv:1709.03696 (crosslist from grqc) [pdf, other]

Title: Status of the asymptotic safety paradigm for quantum gravity and matterAuthors: Astrid EichhornComments: 21 pages; extended version of a talk given at the workshop on Black Holes, Gravitational Waves and Spacetime Singularities, May 2017, Specola Vaticana; prepared for the proceedings of the workshopSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
In the asymptotic safety paradigm, a quantum field theory reaches a regime with quantum scale invariance in the ultraviolet, which is described by an interacting fixed point of the Renormalization Group. Compelling hints for the viability of asymptotic safety in quantum gravity exist, mainly obtained from applications of the functional Renormalization Group. The impact of asymptotically safe quantum fluctuations of gravity at and beyond the Planck scale could at the same time induce an ultraviolet completion for the Standard Model of particle physics with high predictive power.
 [10] arXiv:1709.07451 (crosslist from astroph.CO) [pdf, other]

Title: Vacuum dynamics in the Universe versus a rigid $Λ=$constComments: Published in Int. J. Mod. Phys. A32 (2017) 1730014. arXiv admin note: text overlap with arXiv:1705.06723Subjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
In this year, in which we celebrate 100 years of the cosmological term, $\Lambda$, in Einstein's gravitational field equations, we are still facing the crucial question whether $\Lambda$ is truly a fundamental constant or a mildly evolving dynamical variable. After many theoretical attempts to understand the meaning of $\Lambda$, and in view of the enhanced accuracy of the cosmological observations, it seems now mandatory that this issue should be first settled empirically before further theoretical speculations on its ultimate nature. In this work, we summarize the situation of some of these studies. Devoted analyses made recently show that the $\Lambda=$const. hypothesis, despite being the simplest, may well not be the most favored one. The overall fit to the cosmological observables $SNIa+BAO+H(z)+LSS+CMB$ singles out the class RVM of the "running" vacuum models, in which $\Lambda=\Lambda(H)$ is an affine powerlaw function of the Hubble rate. It turns out that the performance of the RVM as compared to the "concordance" $\Lambda$CDM model (with $\Lambda=$const.) is much better. The evidence in support of the RVM may reach $\sim 4\sigma$ c.l., and is bolstered with Akaike and Bayesian criteria providing strong evidence in favor of the RVM option. We also address the implications of this framework on the tension between the CMB and local measurements of the current Hubble parameter.
 [11] arXiv:1709.07456 (crosslist from grqc) [pdf, ps, other]

Title: On symmetry inheritance of the nonminimally coupled scalar fieldsComments: 14 pagesSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
We present the first symmetry inheritance analysis of the fields nonminimally coupled to gravity. In this work we are focused on the real scalar field $\phi$ with nonminimal coupling of the form $\xi\phi^2 R$. Possible cases of the symmetry noninheriting fields are constrained by the properties of the Ricci tensor and the scalar potential. Examples of such spacetimes can be found among those which are "dressed" with the stealth scalar field, a nontrivial scalar field configuration with the vanishing energymomentum tensor. We classify the scalar field potentials which allow the symmetry noninheriting stealth field configurations on top of the exact solutions of the Einstein's gravitational field equation with the cosmological constant.
 [12] arXiv:1709.07464 (crosslist from astroph.CO) [pdf, ps, other]

Title: Primordial perturbations with preinflationary bounceComments: 23 pages, 19 figures;Subjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
Based on the effective field theory (EFT) of nonsingular cosmologies, we build a stable model, without the ghost and gradient instabilities, of bounce inflation (inflation is preceded by a cosmological bounce). We perform a full simulation for the evolution of scalar perturbation, and find that the perturbation spectrum has a largescale suppression (as expected), which is consistent with the power deficit of the cosmic microwave background (CMB) TTspectrum at low multipoles, but unexpectedly, it also shows itself one marked lower valley, which actually provides a better fit to the dip at multipole $l\sim 20$. The depth of valley is relevant with the physics around the bounce scale, which is modeldependent.
 [13] arXiv:1709.07477 (crosslist from hepph) [pdf, ps, other]

Title: On the observable spectrum of theories with a BroutEnglertHiggs effectComments: 19 pages, 9 TablesSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Lattice (heplat); High Energy Physics  Theory (hepth)
The physical, observable spectrum in gauge theories is made up from gaugeinvariant states. In the standard model the Fr\"ohlichMorchioStrocchi mechanism shows that these states can be adequately mapped to the gaugedependent elementary $W$, $Z$ and Higgs states. In theories with a more general gauge group and Higgs sector this is no longer necessarily the case. We classify and predict the physical spectrum for a wide range of such theories, with special emphasis on GUTlike cases, and show that discrepancies between the spectrum of elementary fields and physical particles frequently arise.
 [14] arXiv:1709.07479 (crosslist from astroph.CO) [pdf, other]

Title: Primordial nonGaussianity and power asymmetry with quantum gravitational effects in loop quantum cosmologyComments: revtex4, one figure and no tablesSubjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
Loop quantum cosmology (LQC) provides a resolution of the classical big bang singularity in the deep Planck era. The evolution, prior to the usual slowroll inflation, naturally generates excited states at the onset of the slowroll inflation. It is expected that these quantum gravitational effects could leave its fingerprints on the primordial perturbation spectrum and nonGaussianity, and lead to some observational evidences in the cosmic microwave background (CMB). While the impact of the quantum effects on the primordial perturbation spectrum has been already studied and constrained by current data, in this paper we continue studying such effects on the nonGaussianity of the primordial curvature perturbations. In this paper, we present detailed and analytical calculations of the nonGaussianity and show explicitly that the corrections due to quantum effects are in the same magnitude of the slowroll parameters in the observable scales and thus are well within current observational constraints. Despite this, we show that the nonGaussianity in the squeezed limit can be enhanced at superhorizon scales and further, these effects may yield a large statistical anisotropy on the power spectrum through the ErickcekKamionkowskiCarroll mechanism.
 [15] arXiv:1709.07503 (crosslist from grqc) [pdf, other]

Title: Can the graviton have a large mass near black holes?Comments: 6 pages, 4 figuresSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Astrophysical Phenomena (astroph.HE); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
The mass of the graviton, if nonzero, is usually considered to be very small, e.g. of the Hubble scale, from several observational constraints. In this paper, we propose a gravity model where the graviton mass is very small in the usual weak gravity environments, below all the current graviton mass bounds, but becomes much larger in the strong gravity regime such as a black hole's vicinity. For black holes in this model, significant deviations from general relativity emerge very close to the black hole horizon and alter the black hole quasinormal modes, which can be extracted from the ringdown waveform of black hole binary mergers. Also, the enhancement of the graviton mass near the horizon can result in echoes in the late time ringdown, which can be verified in the upcoming gravitational wave observations of higher sensitivity.
 [16] arXiv:1709.07718 (crosslist from hepph) [pdf, ps, other]

Title: The fiveloop Beta function for a general gauge group and anomalous dimensions beyond Feynman gaugeComments: 17 pages, 2 ancillary files files available with the sourceSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
We focus on a nonabelian gauge field coupled to a single (but general) representation of a family of Nf fermions. By using the same machinery that had allowed us to evaluate the subleading largeNf term of the fiveloop Beta function earlier, we here report on a confirmation of the allNf result that has in the meantime been published by another group. Furthermore, in order to push forward the 5loop renormalization program regarding gauge parameter dependence, we present the linear terms of the complete set of anomalous dimensions, in an expansion in the covariant gauge parameter around the Feynman gauge.
 [17] arXiv:1709.07749 (crosslist from grqc) [pdf, ps, other]

Title: Does spacetime torsion determine the minimum mass of gravitating particles?Comments: 21 pages, 3 figuresSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Astrophysical Phenomena (astroph.HE); High Energy Physics  Theory (hepth)
We derive upper and lower limits for the massradius ratio of spinfluid spheres in EinsteinCartan theory, with matter satisfying a linear barotropic equation of state, and in the presence of a cosmological constant. Adopting a spherically symmetric interior geometry, we obtain the generalized continuity and TolmanOppenheimerVolkoff equations for a Weyssenhoff spinfluid in hydrostatic equilibrium, expressed in terms of the effective mass, density and pressure, all of which contain additional contributions from the spin. The generalized Buchdahl inequality, which remains valid at any point in the interior, is obtained, and general theoretical limits for the maximum and minimum massradius ratios are derived. As an application of our results we obtain gravitational red shift bounds for compact spinfluid objects, which may (in principle) be used for observational tests of EinsteinCartan theory in an astrophysical context. We also briefly consider applications of the torsioninduced minimum mass to the spingeneralized strong gravity model for baryons/mesons, and show that the existence of quantum spin imposes a lower bound for spinning particles, which almost exactly reproduces the electron mass.
 [18] arXiv:1709.07765 (crosslist from hepph) [pdf, other]

Title: TwoLoop Renormalization Group Equations and Gauge Couplings UnificationAuthors: Antonio CostantiniComments: 20 pages, 23 figures, 1 tableSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
We analize the impact of twoloop renormalization group equations on the $SU(3)_c\times SU(2)_w\times U(1)_Y$ gauge couplings unification in various supersymmetric theories. In general the presence of superfields in higher representation than the doublet spoil the gauge couplings unification at oneloop. The situation is more interesting when the renormalization group equations are calculated at twoloop. In this case we show that the unification of the gauge couplings can be achieved for models with triplet superfield(s). In the analysis of the models with triplet superfield(s) we show that the dimensionless couplings do not have a Landau pole in their evolution at high energies but they run to a nontrivial ultraviolet fixed point.
 [19] arXiv:1709.07795 (crosslist from astroph.CO) [pdf, other]

Title: An effective description of dark energy: from theory to phenomenologyAuthors: Michele MancarellaComments: PhD thesis, defended on June 27th,2017 with original title "Tests de coh\'erence de l'Univers et reliques cosmiques"Subjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
In the last decades, a cosmological model that fits observations through a vast range of scales emerged. It goes under the name of ${\Lambda}$CDM. However, there are still challenging questions that remain unanswered by this model, such as what causes the observed accelerated expansion of the universe, and many alternatives have been proposed. This thesis concerns an approach to test such models known as "Effective Theory of Dark Energy" . It applies to all models where general relativity is modified by adding a single scalar degree of freedom, called "scalartensor theories". In Chapter 1 I summarise the most general class of such theories currently known, called "Degenerate higherOrder ScalarTensor" (DHOST) theories. In Chapter 2, I introduce the effective theory of dark energy. The inclusion of a general coupling between matter and the gravitational sector is the subject of Chapter 3. Chapter 4 analyses in details the stability of different classes of theories. Notably, I show that the most general class of theories free from instabilities reduces to the socalled Horndeski and beyondHorndeski theories, up to a non minimal coupling to matter. Another goal of the thesis is to study the observable effects of deviations from ${\Lambda}$CDM. In Chapter 5, I consider the possibility of an interaction between dark matter and dark energy and I analyse the constraining power of future surveys on the free parameters of the theory. Chapter 6 focuses on the observational effects of theories where a kinetic mixing between matter and the scalar field exists. This gives a peculiar and potentially observable effect, namely the weakening of gravity at large scale structure scales.
 [20] arXiv:1709.07845 (crosslist from grqc) [pdf, ps, other]

Title: Detecting quantum gravity in the skyAuthors: Gianluca CalcagniComments: 5 pages, 1 figure. In Proceedings of EPSHEP 2017, European Physical Society conference on High Energy Physics, July 512, 2017, Venice, ItalySubjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
Getting signatures of quantum gravity is one of the topical lines of research in modern theoretical physics and cosmology. This short review faces this challenge under a novel perspective. Instead of separating quantumgravity effects of a specific model between UV and IR regimes, we consider a general feature, possibly common to many frameworks, where all scales are affected and spacetime geometry is characterized by a complex critical exponent. This leaves a logoscillating modulation pattern in the cosmic microwave background spectrum and gives a unique opportunity, illustrated with the example of a multifractional theory, to test quantum gravities at cosmological scales.
 [21] arXiv:1709.07853 (crosslist from astroph.CO) [pdf, other]

Title: Higgs inflation with loop corrections in the Palatini formulationComments: 31 pages, 22 figuresSubjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
We compare Higgs inflation in the metric and Palatini formulations of general relativity, with loop corrections are treated in a simple approximation. We consider Higgs inflation on the plateau, at a critical point, at a hilltop and in a false vacuum. In the last case there are only minor differences. Otherwise we find that in the Palatini formulation the tensortoscalar ratio is consistently suppressed, spanning the range $1\times10^{13}<r<7\times10^{5}$, compared to the metric case result $2\times10^{5}<r<0.2$. Even when the values of $n_s$ and $r$ overlap, the running and running of the running are different in the two formulations. Therefore, if Higgs is the inflaton, inflationary observables can be used to distinguish between different gravitational degrees of freedom, in this case to determine whether the connection is an independent variable. Nondetection of $r$ in foreseeable future observations would not rule out Higgs inflation, only its metric variant. We conclude that in order to fix the theory of Higgs inflation, not only the particle physics UV completion but also the gravitational degrees of freedom have to be explicated.
Replacements for Mon, 25 Sep 17
 [22] arXiv:1405.4821 (replaced) [pdf, ps, other]

Title: Large Hierarchy from Nonminimal CouplingAuthors: Chunshan LinComments: 9 pages; v3: reorganize the paper, more discussions and references added;Journalref: Commun. Theor. Phys. 68 (2017) 223226Subjects: High Energy Physics  Theory (hepth); High Energy Physics  Phenomenology (hepph)
 [23] arXiv:1501.03159 (replaced) [pdf, other]

Title: TDiff and Weyl Invariant Massive Spin2: Linear TheoryComments: 37 pages, 2 figures. v3 some statements on equivalence correctedJournalref: Phys. Rev. D 91, 125008 (2015)Subjects: High Energy Physics  Theory (hepth); General Relativity and Quantum Cosmology (grqc)
 [24] arXiv:1502.04444 (replaced) [pdf, ps, other]

Title: Spherical TDuality and the spherical FourierMukai transformComments: 18 pages, major revision and results generalisedSubjects: High Energy Physics  Theory (hepth); Differential Geometry (math.DG)
 [25] arXiv:1510.00023 (replaced) [pdf, ps, other]

Title: Normalizability analysis of the generalized quantum electrodynamics from the causal point of viewComments: V2: 32 pages, affiliations updated, published versionJournalref: Int. J. Mod. Phys. A32, 1750165 (2017)Subjects: High Energy Physics  Theory (hepth); Mathematical Physics (mathph)
 [26] arXiv:1607.06817 (replaced) [pdf, other]

Title: Holographic quenches and anomalous transportComments: 34 pages, 10 figuresSubjects: High Energy Physics  Theory (hepth)
 [27] arXiv:1610.06087 (replaced) [pdf, ps, other]

Title: Hamiltonian Analysis of an Onshell U(1) Gauge Field TheoryComments: 9 pages, no figure. V2: published versionJournalref: Phys. Lett. B ... (2017)Subjects: Classical Physics (physics.classph); High Energy Physics  Theory (hepth)
 [28] arXiv:1612.07116 (replaced) [pdf, ps, other]

Title: Cosmological singularity resolution from quantum gravity: the emergentbouncing universeComments: 6 pages, 2 figures. Revised version accepted for publication in PRD. In this new version improved numerical simulations show damped oscillations in the pre bounce phase. Full Discussion section addedJournalref: Phys. Rev. D 96, 046008 (2017)Subjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
 [29] arXiv:1701.07445 (replaced) [pdf, other]
 [30] arXiv:1705.09010 (replaced) [pdf, other]

Title: Barnacles and GravityAuthors: James H. C. ScargillComments: 31 pages, 11 figuresJournalref: JHEP 09 (2017) 080Subjects: General Relativity and Quantum Cosmology (grqc); Cosmology and Nongalactic Astrophysics (astroph.CO); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
 [31] arXiv:1706.03773 (replaced) [pdf, other]

Title: Transport signatures of Hall viscosityComments: 5+3 pages, 2 figures; v2: references addedSubjects: Strongly Correlated Electrons (condmat.strel); Mesoscale and Nanoscale Physics (condmat.meshall); High Energy Physics  Theory (hepth)
 [32] arXiv:1707.00716 (replaced) [pdf, other]

Title: Higher dimensional operators in 2HDMComments: 34 pages, 6 figures; to appear in JHEPSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
 [33] arXiv:1707.05820 (replaced) [pdf, other]

Title: Inflationary magneto(non)genesis, increasing kinetic couplings, and the strong coupling problemComments: 19 pages plus references, 4 figures; v2, references and clarification addedSubjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Phenomenology (hepph); High Energy Physics  Theory (hepth)
 [34] arXiv:1707.09914 (replaced) [pdf, ps, other]

Title: On the ambiguity in the notion of transverse traceless modes of gravitational wavesComments: 36 pages. The detailed of the Letter arXiv:1707.07729; some references and minor clarifications addedSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth)
 [35] arXiv:1708.04631 (replaced) [pdf, other]

Title: AGT/Z$_2$Comments: 56 pages. v2: Clarify discrete theta angleSubjects: High Energy Physics  Theory (hepth)
 [36] arXiv:1709.06964 (replaced) [pdf, ps, other]

Title: Rotating and spatially twisting Locally Rotationally Symmetric Spacetimes in f(R)Gravity: a NoGo theoremComments: 6 pages, additional text included, some typos corrected, references addedSubjects: General Relativity and Quantum Cosmology (grqc); High Energy Physics  Theory (hepth); Mathematical Physics (mathph)
 [37] arXiv:1709.07014 (replaced) [pdf, other]

Title: Monodromy inflation at strong coupling: $4π$ in the skyComments: 11 pages LaTeX, 2 figures v2: a couple of small typos fixedSubjects: High Energy Physics  Theory (hepth)
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