Thu·Jul 5, 2018Thursday·July 5, 2018

1. 01*

   Beta and Neutrinoless Double Beta Decays with KeV Sterile Fermions

   Asmaa Abada🇫🇷 · Alvaro Hernandez-Cabezudo🇩🇪 · Xabier Marcano🇫🇷

   Motivated by the capability of the KATRIN experiment to explore the existence of KeV neutrinos in the $[1-18.5]$ KeV mass range, we explore the viability of minimal extensions of the Standard Model involving sterile neutrinos (namely the 3 + $N$ frameworks) and study their possible impact in both the beta energy spectrum and the neutrinoless double beta decay effective mass, for the two possible ordering cases for the light neutrino spectrum. We also explore how both observables can discriminate between motivated low-scale seesaw realizations involving KeV sterile neutrinos. Our study concerns the prospect of a Type-I seesaw with two right-handed neutrinos, and a combination of the inverse and the linear seesaws where the Standard Model is minimally extended by two quasi-degenerate sterile fermions. We also discuss the possibility of exploring the latter case searching for double-kinks in KATRIN.

   hep-phJHEP(2019)·60 citations
2. 02*

   Quark jet rates and quark/gluon discrimination in multi-jet final states

   Yasuhito Sakaki🇰🇷

   We estimate the number of quark jets in QCD multi-jet final states at hadron colliders. In the estimation, we develop the calculation of jet rates into that of quark jet rates. From the calculation, we estimate the improvement on the signal-to-background ratio for a signal semi-analytically by applying quark/gluon discrimination, where the signal predicts many quark jets. We introduce a variable related to jet flavors in multi-jet final states and propose a data-driven method using the variable to reduce systematic uncertainties of analysis results. As the same with the semi-analytical result, the improvements on the signal-to-background ratio using the variable in Monte-Carlo analysis are estimated.

   hep-phhep-exPRD(2019)·15 citations
3. 03*

   Standard Model Extension with Flipped Generations

   Carlos Alvarado🇺🇸 · Alfredo Aranda🇲🇽

   An extension of the Standard Model is presented that leads to the possible existence of new gauge bosons with masses in the range of a few TeV. Due to the fact that their couplings to Standard Model fermions are strongly suppressed, it is possible for them to be hidden from current searches. The model contains additional generations of fermions with quantum numbers resembling those of the Standard Model fermion generations but with a twist: their charge assignments are such that their electric charges and chiralities are flipped with respect to those of their corresponding Standard Model counterparts. This feature provides a way to obtain potential dark matter candidates and the interesting possibility for a Lepton number conserving dimension-five operator for Dirac neutrino masses. The model implications associated to electroweak precision parameters, flavor changing neutral currents, and diphoton rate contributions are briefly discussed. The general assumptions of this set up are also used to sketch a couple of variants of the model with peculiar features that could motivate further study.

   hep-phPLB(2018)·1 citation
4. 04*

   Constraining resonant dark matter with combined LHC electroweakino searches

   Giancarlo Pozzo🇦🇺 · Yang Zhang🇦🇺

   In the Minimal Supersymmetric Standard Model light neutralinos can satisfy the dark matter (DM) abundance constraint by resonant annihilation via a $Z$ or a light Higgs ($h$) boson. In this work we study the current and future status of this scenario by investigating relevant experimental constraints, including DM direct detection, measurements of $Z$ and Higgs invisible decays, and direct searches at the Large Hadron Collider (LHC). To take full advantage of the LHC data, we combine the results of all relevant electroweakino searches performed by the Compact Muon Solenoid (CMS) Collaboration. Such combination increases the bound on the Higgsino mass parameter to $|\mu |>390$ GeV, which is about 80 GeV stricter than the bound obtained from individual analyses. In a simplified model we find that the $Z$ funnel region is on the brink of exclusion, the $h$ funnel for $\mu <0$ only survives if $\tan \beta <7.4$, and the $h$ funnel for $\mu >0$ is the main surviving region. Future DM direct detection experiments, such as LUX and ZEPLIN, can explore the whole region, while the high luminosity LHC can exclude $\tan \beta >8$ for $\mu >0$ and $\tan \beta >5.5$ for $\mu <0$. After applying the muon anomalous magnetic moment constraint only a tiny part of the $Z/h$ funnel region survives which will soon be probed by ongoing experiments.

   hep-phPLB(2019)·31 citations
5. 05*

   $t\to cg$ and $t\to cZ$ in Universal Extra Dimensional Models

   Cheng-Wei Chiang🇹🇼 · Ujjal Kumar Dey🇮🇳 · Tapoja Jha🇮🇳

   In this work we perform a complete one-loop calculation of the flavor-changing top quark decays $t\to cg$ and $t\to cZ$ in the universal extra dimensional models. We find that the branching ratios of these decays in the minimal scenario remain unaltered from the Standard Model expectations for currently allowed values of the inverse compactification radius. In the non-minimal setup, the branching ratios can be enhanced from the Standard Model due to the presence of boundary localized terms which modify the mass spectrum and couplings in the theory in a non-trivial way. We also check the compatibility of the parameter choices that result in enhancements in these rare decays with other experimental observations.

   hep-phEur.Phys.J.Plus(2019)·18 citations
6. 06*

   Gottfried sum rule from maximum entropy method quark distributions with DGLAP evolution and DGLAP evolution with GLR-MQ-ZRS corrections

   Chengdong Han🇨🇳 · Qiang Fu🇨🇳 · Xurong Chen🇨🇳

   A new method to test the valence quark distribution of nucleon obtained from the maximum entropy method using Gottfried sum rule by performing DGLAP equations with the GLR-MQ-ZRS corrections and original LO~/~NLO DGLAP equations are outlined. The test relies on a knowledge of the unpolarized electron-proton structure function $F_2^{ep}$ and electron-neutron structure function $F_2^{en}$ and the assumption that Bjorken scaling is satisfied. In this work, the original Gottfried summation value obtained by the integrals of the structure function at different Q${}^2$ is in accordance with the theoretical value 1/3 under the premise of light-quark flavour symmetry of nucleon sea, whether it is the result from the dynamics evolution equations or the result from global QCD fits of PDFs. Finally, we present the summation value of the LO / NLO DGLAP global fits of PDFs under the premise of light-quark flavour asymmetry of nucleon sea. According to analysis the original Gottfried summation value with two evolution equations at different $Q^2$, we can know that the valence quark distributions of nucleon obtained by the maximum entropy method are effective and reliable.

   hep-phCPC(2018)·1 citation
7. 07*

   Quantum correlations and the neutrino mass degeneracy problem

   Khushboo Dixit🇮🇳 · Javid Naikoo🇮🇳 · Subhashish Banerjee🇮🇳 · Ashutosh Kumar Alok🇮🇳

   Many facets of nonclassicality are probed in neutrino system in the context of three flavour neutrino oscillations. The analysis is carried out for parameters relevant to two ongoing experiments NO$\nu$A and T2K, and also for the upcoming experiment DUNE. The various quantum correlations turn out to be sensitive to the mass-hierarchy problem in neutrinos. This sensitivity is found to be more prominent in DUNE experiment as compared to NO$\nu$A and T2K experiments. This can be attributed to the large baseline and high energy of the DUNE experiment. Further, we find that to probe these correlations, the neutrino (antineutrino) beam should be preferred if the sign of mass square difference ${\Delta }_{31}$ turns out to be positive (negative).

   hep-phEPJC(2018)·26 citations
8. 08*

   Higher-order QCD corrections to hadronic $\tau$ decays from Padé approximants

   Diogo Boito🇧🇷 · Pere Masjuan🇪🇸 · Fabio Oliani🇧🇷

   Perturbative QCD corrections to hadronic $\tau$ decays and $e^{+}{e}^{-}$ annihilation into hadrons below charm are obtained from the Adler function, which at present is known in the chiral limit to five-loop accuracy. Extractions of the strong coupling, ${\alpha }_s$, from these processes suffer from an ambiguity related to the treatment of unknown higher orders in the perturbative series. In this work, we exploit the method of Padé approximants and its convergence theorems to extract information about higher-order corrections to the Adler function in a systematic way. First, the method is tested in the large-${\beta }_0$ limit of QCD, where the perturbative series is known to all orders. We devise strategies to accelerate the convergence of the method employing renormalization scheme variations and the so-called D-log Padé approximants. The success of these strategies can be understood in terms of the analytic structure of the series in the Borel plane. We then apply the method to full QCD and obtain reliable model-independent predictions for the higher-order coefficients of the Adler function. For the six-, seven-, and eight-loop coefficients we find $c_{5,1}=277\pm 51$, $c_{6,1}=3460\pm 690$, and $c_{7,1}=(2.02\pm 0.72)\times 10^4$, respectively, with errors to be understood as lower and upper bounds. Our model-independent reconstruction of the perturbative QCD corrections to the $\tau$ hadronic width strongly favours the use of fixed-order perturbation theory (FOPT) for the renormalization-scale setting.

   hep-phJHEP(2018)·64 citations
9. 09*

   $VHH$ production at the High-Luminosity LHC

   Karl Nordström🇳🇱 · Andreas Papaefstathiou🇳🇱

   We study the phenomenology of associated production of a vector boson with a pair of Higgs bosons ($VHH$) at the High-Luminosity LHC. Despite the low rate of this channel, the scaling of the cross section suggests a measurement could be a useful probe of modifications of the trilinear Higgs boson coupling and anomalous interactions in the gauge-Higgs sector. We focus on both $WHH$ and $ZHH$ production, using the leptonic ($W\to l\nu$, $Z\to ll$, $Z\to \nu \nu$) decay modes of the vector bosons and the $HH\to 4b$ di-Higgs decay mode. We show that top pair backgrounds are problematic for the $W\to l\nu$ and $Z\to \nu \nu$ channels, leaving $Z\to ll$ as the most promising decay mode. However, even for this channel, we find limited sensitivity due to a low signal rate. We discuss some potential avenues for improvement.

   hep-phhep-exEur.Phys.J.Plus(2019)·12 citations
10. 10*

    BSM physics at the LHeC and the FCC-he

    Georges Azuelos🇨🇦 · Monica D'Onofrio🇬🇧 · Oliver Fischer🇩🇪 · Jose Zurita🇩🇪

    Electron-proton ($e^{-}p$) colliders are an ideal laboratory to study common features of electron and quarks with production via electroweak bosons, leptoquarks, multi-jet final states and very forward physics, due to their impressive pseudorapidity coverage. In addition to these physics cases, there exist a broad Beyond the Standard Model (BSM) program aimed at exploring the capabilities of the LHeC [1] and FCC-he [2] for several New Physics scenarios. Although their centre-of-mass energy is down with respect to a $pp$ collider by a factor of $\sqrt{E_p/E_e}\sim 10(30)$ for the LHeC (FCC-he), they can be an invaluable tool to characterize BSM physics hints at $ee$ and $pp$ machines. The aim of this talk is to provide, on behalf of the BSM $e^{-}p$ Working Group, an overview of the aforementioned BSM program, by briefly summarizing the existing studies and reporting on the most recent progress. We expect that the ample scope in terms of NP models to be tested would enhance the synergies between the BSM and $e^{-}p$ communities

    hep-phPoS(2018)·8 citations
11. 11*

    Revisiting R-parity violating interactions as an explanation of the B-physics anomalies

    Sokratis Trifinopoulos🇨🇭

    In the last few years, the ratios $R_{D^{(\ast )}}$ and of $R_{K^{(\ast )}}$ have reportedly exhibited significant deviations from the relevant Standard Model predictions, hinting towards a possible violation of Lepton Flavor Universality and a window to New Physics. We investigate to what extent the inclusion of R-parity violating couplings in the Minimal Supersymemtric Standard Model can provide a better fit to the anomalies simultaneously. We perform this analysis employing an approximate, non-abelian ${\mathcal{G}}_f=U(2{)}_q\times U(2{)}_{\ell }$ flavour symmetry, which features a natural explanation of the appropriate hierarchy of the R-parity violating couplings. We show that, under the requirement of a supersymmetric spectrum with much heavier left-handed doublet superpartners, our assumption favors a considerable enhancement in the tree-level charged-current $B\to D^{(\ast )}\tau \overline{\nu }$, while the anomalies induced by $b\to s{\ell }^{+}{\ell }^{-}$ receive up to an approximate $30\%$ improvement. The consistency with all relevant low-energy constraints is assessed.

    hep-phEPJC(2018)·41 citations
12. 12*

    Right-handed Currents Searches and Parity Doubling

    James Gratrex🇬🇧 · Roman Zwicky🇬🇧

    The extraction of right-handed currents, beyond the Standard Model, faces theoretical challenges from long-distance contributions. We show that these effects can be controlled by combining, for example, studies of $B\to V(1^{-})\gamma$ and $B\to A(1^{+})\gamma$ observables. The sum of the long-distance contributions can be extracted without compromise, and the individual pieces follow from a ratio predicted by theory. This leads to significant reduction in the uncertainty of long-distance contributions. The ideas extend to charm decays and the low $q^2$-region of $B\to V\ell \bar{\ell }$, and open the prospect of checking input affecting the angular $B\to K^{\ast }\mu \mu$-anomaly.

    hep-phhep-ex2 citations
13. 13*

    Theoretical Study of the Hard Photons Flow Emission Rate at $s\bar{b}\to \gamma g$ Systems in Annihilation Processes in One Loop

    Hadi J. M. Al-Agealy🇮🇶 · Maher Sami Saleh🇮🇶

    In this paper, we evaluate and analyze hard photons flow emission at $s\bar{b}\to \gamma g$ quarks system interaction in annihilation processes due to a quantum field theory in high energy physics. Two quantum wave vectors are assumed to localize quark and anti-quark in quantum space for higher thermal energy system. Quantum postulate theory and perturbative theory take into account the photonic flow emission rate that gets produced according to quantum model. The photonic flow rate is evaluated depending on physical parameters: activation coupling strength, electric charge of quark system, fugacity, transition momentum, quantum color number, photonic energies, total charge quark system, Euler factor, critical temperature and temperature of the quarks system. The photonic flow rate for $s\bar{b}\to \gamma g$ quarks system production in one loop Annihilation processes depends on the activation coupling strength, thermal energy, critical temperature, and fugacity. The rate increases with decreases in activation coupling strength and the critical temperature and with increases in the temperature and vice versa. However, the photonic flow rate increases with the fugacity at one-loop based on Juttner distribution and vice versa.

    hep-phhep-th0 citations
14. 14*

    Constituent Counting Rules and Exotic Hadrons

    Richard F. Lebed🇺🇸

    The constituent counting rules, i.e., the scaling behavior of amplitudes (in terms of the number of fundamental constituents) for exclusive processes when high energy scales are present, have been known for decades, and have been borne out in a number of experiments. Such scaling would be sensitive, in particular, to possible exotic multiquark content. Here we examine how one may use the rules to test for pentaquarks in electroproduction, or for tetraquarks in e^+ e^- annihilation. An interesting new type of scaling (separate Mandelstam s and t behavior) arises in the forward scattering direction. The correct scaling arises naturally in AdS/QCD, in which the amplitudes can be computed explicitly.

    hep-phFew Body Syst.(2018)·4 citations
15. 15*

    Master Integrals for double real radiation emission in heavy-to-light quark decay

    Roberto Bonciani🇮🇹 · Alessandro Broggio🇩🇪 · Leandro Cieri🇮🇹 · Andrea Ferroglia🇺🇸

    We evaluate analytically the master integrals for double real radiation emission in the b --> u W* decay, where b and u are a massive and massless quark, respectively, while W* is an off-shell charged weak boson. Since the W boson can subsequently decay in a lepton anti-neutrino pair, the results of the present paper constitute a further step toward a fully analytic computation of differential distributions for the semileptonic decay of a b quark at NNLO in QCD. The latter partonic process plays a crucial role in the study of inclusive semileptonic charmless decays of B mesons. Our results are expressed in terms of multiple polylogarithms of maximum weight four.

    hep-phEPJC(2018)·2 citations
16. 16*

    One-loop effective LFV $Z{l}_k{l}_m$ vertex from heavy neutrinos within the Mass Insertion Approximation

    M.J. Herrero🇪🇸 · X. Marcano🇫🇷 · R. Morales🇦🇷 · A. Szynkman🇦🇷

    In this paper we study the effective lepton flavor violating vertex of an electroweak $Z$ gauge boson and two charged leptons with different flavor, $l_k$ and $l_m$, that is generated to one-loop in low scale seesaw models with right handed neutrinos whose masses are heavier than the electroweak scale. We first compute the form factor describing this vertex by using the mass insertion approximation, where the flavor non-diagonal entries of the neutrino Yukawa coupling matrix are the unique origin, to one-loop level, of lepton flavor changing processes with charged leptons in the external legs. Then, by considering the proper large right handed neutrino mass expansion of the form factor, we derive a formula for the $Z{l}_k{l}_m$ effective vertex which is very simple and useful for fast phenomenological estimates. In the last part of this work we focus on the phenomenological applications of this vertex for simple and accurate estimates of the $Z\to l_k{\bar{l}}_m$ decay rates. Concretely, this vertex will allow us to conclude easily on the maximum allowed decay rates by present data in the inverse seesaw model. The found rates are promising, at the reach of future lepton colliders.

    hep-phEPJC(2018)·21 citations
17. 17*

    Primordial Black Holes from the QCD axion

    Francesc Ferrer🇺🇸 · Eduard Masso🇪🇸 · Giuliano Panico🇪🇸 · Oriol Pujolas🇪🇸 · Fabrizio Rompineve🇪🇸

    We propose a mechanism to generate Primordial Black Holes (PBHs) which is independent of cosmological inflation and occurs slightly below the QCD phase transition. Our setup relies on the collapse of long-lived string-domain wall networks and is naturally realized in QCD axion models with domain wall number $N_{DW}>1$ and Peccei-Quinn symmetry broken after inflation. In our framework, dark matter is mostly composed of axions in the meV mass range along with a small fraction, ${\Omega }_{\text{PBH}}\gtrsim 10^{-6}{\Omega }_{\text{CDM}}$ of heavy $M\sim 10^4-10^7{M}_{\odot }$ PBHs. The latter could play a role in alleviating some of the shortcomings of the $\Lambda$CDM model on sub-galactic scales. The scenario has distinct signatures in ongoing axion searches as well as gravitational wave observatories.

    hep-phastro-ph.COPRL(2019)·116 citations
18. 18*

    BSM Hadronic Matrix Elements for ${ϵ}^{\prime }/ϵ$ and $K\to \pi \pi$ Decays in the Dual QCD Approach

    Jason Aebischer🇩🇪 · Andrzej J. Buras🇩🇪 · Jean-Marc Gerard🇧🇪

    We calculate for the first time all four-quark hadronic matrix elements of local operators possibly contributing to $K\to \pi \pi$ decays and in particular to the ratio ${ϵ}^{\prime }/ϵ$ beyond the Standard Model (BSM). To this end we use the Dual QCD (DQCD) approach. In addition to 7 new mirror operators obtained from the SM ones by flipping the chirality, we count 13 BSM four-quark operators of a given chirality linearly independent of each other and of the aforesaid 14 operators for which hadronic matrix elements are already known. We present results in two bases for all these operators, one termed DQCD basis useful for the calculation of the hadronic matrix elements in the DQCD approach and the other called SD basis suited to the short distance renormalization group evolution above the 1~GeV scale. We demonstrate that the pattern of long distance evolution (meson evolution) matches the one of short distance evolution (quark-gluon evolution), a property which to our knowledge cannot be presently achieved in any other analytical framework. The highlights of our paper are chirally enhanced matrix elements of tensor-tensor and scalar-scalar BSM operators. They could thereby explain the emerging ${ϵ}^{\prime }/ϵ$ anomaly which is strongly indicated within DQCD with some support from lattice QCD. On the other hand we do not expect the BSM operators to be relevant for the $\Delta I=1/2$ rule.

    hep-phhep-exhep-latJHEP(2019)·38 citations
19. 19*

    The quantum cosmological constant

    Stephon Alexander🇺🇸 · Joao Magueijo🇬🇧 · Lee Smolin🇺🇸

    We present an extension of general relativity in which the cosmological constant becomes dynamical and turns out to be conjugate to the Chern-Simons invariant of the Ashtekar connection on a spatial slicing. The latter has been proposed in \cite{Chopin-Lee} as a time variable for quantum gravity: the Chern-Simons time. In the quantum theory the inverse cosmological constant and Chern-Simons time will then become conjugate operators. The "Kodama state" gets a new interpretation as a family of transition functions. These results imply an uncertainty relation between $\Lambda$ and Chern-Simons time; the consequences of which will be discussed elsewhere.

    ↳ gr-qchep-phhep-thSymmetry(2019)·28 citations
20. 20*

    High-Energy Emission from Interacting Supernovae: New Constraints on Cosmic-Ray Acceleration in Dense Circumstellar Environments

    Kohta Murase🇺🇸 · Anna Franckowiak🇩🇪 · Keiichi Maeda🇯🇵 · Raffaella Margutti🇺🇸 · John F. Beacom🇺🇸

    Supernovae (SNe) with strong interactions with circumstellar material (CSM) are promising candidate sources of high-energy neutrinos and gamma rays, and have been suggested as an important contributor to Galactic cosmic rays beyond 1 PeV. Taking into account the shock dissipation by a fast velocity component of SN ejecta, we present comprehensive calculations of the non-thermal emission from SNe powered by shock interactions with a dense wind or CSM. Remarkably, we consider electromagnetic cascades in the radiation zone and subsequent attenuation in the pre-shock CSM. A new time-dependent phenomenological prescription provided by this work enables us to calculate gamma-ray, hard X-ray, radio, and neutrino signals, which originate from cosmic rays accelerated by the diffusive shock acceleration mechanism. We apply our results to SN IIn 2010jl and SN Ib/IIn 2014C, for which the model parameters can be determined from the multi-wavelength data. For SN 2010jl, the more promising case, by using the the latest Fermi Large Area Telescope (LAT) Pass 8 data release, we derive new constraints on the cosmic-ray energy fraction, <0.05-0.1. We also find that the late-time radio data of these interacting SNe are consistent with our model. Further multi-messenger and multi-wavelength observations of nearby interacting SNe should give us new insights into the diffusive shock acceleration in dense environments as well as pre-SN mass-loss mechanisms.

    ↳ astro-ph.HEastro-ph.SRhep-phApJ(2019)·66 citations
21. 21*

    Differential equations for loop integrals without squared propagators

    Jorrit Bosma🇨🇭 · Kasper J. Larsen🇬🇧 · Yang Zhang🇨🇭

    We provide a sufficient condition for avoiding squared propagators in the intermediate stages of setting up differential equations for loop integrals. This condition is satisfied in a large class of two- and three-loop diagrams. For these diagrams, the differential equations can thus be computed using "unitarity-compatible" integration-by-parts reductions, which simplify the reduction problem by avoiding integrals with higher-power propagators.

    ↳ hep-thhep-phPoS(2018)·13 citations
22. 22*

    Emergent de Sitter Cosmology from Decaying AdS

    Souvik Banerjee🇸🇪 · Ulf Danielsson🇸🇪 · Giuseppe Dibitetto🇸🇪 · Suvendu Giri🇸🇪 · Marjorie Schillo🇸🇪

    Recent developments in string compactifications demonstrate obstructions to the simplest constructions of low energy cosmologies with positive vacuum energy. The existence of obstacles to creating scale-separated de Sitter solutions indicates a UV/IR puzzle for embedding cosmological vacua in a unitary theory of quantum gravity. Motivated by this puzzle, we propose an embedding of positive energy Friedmann-Lemaitre-Robertson-Walker cosmology within string theory. Our proposal involves confining 4D gravity on a brane which mediates the decay from a non-supersymmetric false AdS5 vacuum to a true vacuum. In this way, it is natural for a 4D observer to experience an effective positive cosmological constant coupled to matter and radiation, avoiding the need for scale separation or a fundamental de Sitter vacuum.

    ↳ hep-thgr-qchep-phPRL(2018)·124 citations
23. 23*

    Effects of a strong magnetic field on the QCD flux tube

    Claudio Bonati🇮🇹 · Salvatore Calì🇨🇾 · Massimo D'Elia🇮🇹 · Michele Mesiti🇬🇧 · Francesco Negro🇮🇹 · Andrea Rucci🇮🇹 · Francesco Sanfilippo🇮🇹

    In this work we investigate the effect of an external magnetic field B on the shape of flux tubes in QCD by means of lattice simulations, performed with N_f=2+1 flavors of stout improved dynamical staggered quarks with physical masses. After having discussed some difficulties in the practical definition of the flux tube at B=0, we show that these ambiguities do not affect the determination of the flux tube modifications induced by the magnetic field. Different results are obtained depending on the relative orientations of the flux tube and of the magnetic field: they confirm that the magnetic field acts as transverse confinement catalyser and longitudinal confinement inhibitor; moreover, the flux tube itself loses its axial symmetry when it is not directed along the magnetic background.

    ↳ hep-lathep-phhep-thPRD(2018)·36 citations
24. 24*

    Effective Field Theories of Post-Newtonian Gravity: A comprehensive review

    Michèle Levi🇫🇷

    [Abridged] This review article presents the progress made over the last decade, since the introduction of effective field theories (EFTs) into post-Newtonian (PN) gravity. These have been put forward in the context of gravitational waves (GWs) from the compact binary inspiral. The mature development of this interdisciplinary field has resulted in significant advances of wide interest to physics at several levels serving various purposes. The field has firmly demonstrated, that seemingly disparate physical domains, such as quantum field theory and classical gravity, are related, and that the EFT framework is a universal one, where it has been proven to supply a robust methodology to boost progress in the development of PN theory. The review is aimed at a broad audience, from general readers new to the field, to specialists and experts in related subjects. The review begins with an overview of the introduction of EFTs into classical gravity and their development. Then, the basic ideas, which form the conceptual foundation of EFTs, are provided, and the strategy of a multi-stage EFT framework, which is utilized for the PN binary inspiral problem, is outlined. The main body of the review is then dedicated to presenting in detail the study of each of the effective theories at each of the intermediate scales in the problem, up to the actual GW observables. The review is concluded with the multiple prospects of building on the progress in the field, and using further modern field theory insights and tools, to specifically address the study of GWs, as well as to broadly expand our fundamental understanding of gauge and gravity theories across the classical and quantum regimes.

    ↳ hep-thgr-qchep-phRept.Prog.Phys.(2020)·350 citations
25. 25*

    Fluctuations in non-conformal holographic plasma at criticality

    Panagiotis Betzios🇬🇷 · Umut Gürsoy🇳🇱 · Matti Järvinen🇳🇱 · Giuseppe Policastro🇫🇷

    We continue the study initiated in [arXiv:1708.02252] of the fluctuations of a strongly-coupled non-conformal plasma described holographically by Einstein gravity coupled to a dilaton with an exponential potential. The plasma approaches a critical point of a continuous phase transition in a specific limit, where the metric becomes a linear-dilaton background. This results to an analytic description of the quasi-normal mode spectrum, that can be extended perturbatively in the deviation away from the critical point. In the previous paper we showed that at criticality the quasinormal frequencies coalesce into a branch cut on the real axis. In this paper we give a more extended and complete discussion of these results. We compare in detail the numerical and analytical approximations in order to confirm their validity; we study (numerically and in a WKB approximation) the momentum dependence of the modes, in order to determine the cross-over scale that limits the validity of the hydrodynamic approximation, and which becomes arbitrarily low at the critical point; and we discuss in detail the procedure we use to complete the theory in the UV by gluing a slice of AdS geometry, and the extent to which it should provide a good approximation to a smooth UV-complete situation.

    ↳ hep-thhep-phPRD(2020)·18 citations
26. 26*

    Quark mass matrices in magnetized orbifold models with localized Fayet-Iliopoulos terms

    H. Abe🇯🇵 · T.Kobayashi🇯🇵 · S.Takada🇯🇵 · S.Tamba🇯🇵 · T. H. Tatsuishi🇯🇵

    We study magnetized orbifold models. We assume the localized Fayet-Iliopoulos terms and the corresponding gauge background. Such terms lead to strong localization of zero-mode wavefunc- tions. In this setup, we compute quark mass matrices.

    ↳ hep-thhep-phPRD(2018)·3 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.