Thu·May 20, 2021Thursday·May 20, 2021

1. 01*

   Violation of Equivalence Principle in Neutrino Sector: Probing the Extended Parameter Space

   Arman Esmaili🇧🇷

   The oscillation of neutrino flavors, due to its interferometry nature, is extremely sensitive to the phase differences developing during the propagation of neutrinos. In this paper we investigate the effect of the Violation of Equivalence Principle (VEP) on the flavor oscillation probabilities of atmospheric and cosmic neutrinos observed at neutrino telescopes such as IceCube. Assuming a general parameterization of VEP, dubbed extended parameter space, we show that the synergy between the collected data of high energy atmospheric and cosmic neutrinos severely constrains the VEP parameters. Also, the projected sensitivity of IceCube-Gen2 to VEP parameters is discussed.

   hep-phastro-ph.HEJCAP(2021)·4 citations
2. 02*

   Single production of vector-like quarks: the effects of large width, interference and NLO corrections

   Aldo Deandrea🇫🇷 · Thomas Flacke🇰🇷 · Benjamin Fuks🇫🇷 · Luca Panizzi🇸🇪 · Hua-Sheng Shao🇫🇷

   We provide a comprehensive discussion, together with a complete setup for simulations, relevant for the production of a single vector-like quark at hadron colliders. Our predictions include finite width effects, signal-background interference effects and next-to-leading order QCD corrections. We explicitly apply the framework to study the single production of a vector-like quark $T$ with charge 2/3, but the same procedure can be used to analyse the single production of vector-like quarks with charge $-4/3$, $-1/3$, $2/3$ and $5/3$, when the vector-like quark interacts with the Standard Model quarks and electroweak bosons. Moreover, this procedure can be straightforwardly extended to include additional interactions with exotic particles. We provide quantitative results for representative benchmark scenarios characterised by the $T$ mass and width, and we determine the role of the interference terms for a range of masses and widths of phenomenological significance. We additionally describe in detail, both analytically and numerically, a striking feature in the invariant mass distribution appearing only in the $T\to th$ channel.

   hep-phhep-exJHEP(2021)·62 citations
3. 03*

   The suppressions of dijet azimuthal correlations in the future EIC

   Ye-Yin Zhao🇨🇳 · Ming-Mei Xu🇨🇳 · Li-Zhu Chen🇨🇳 · Dong-Hai Zhang🇨🇳 · Yuan-Fang Wu🇨🇳

   Quark-antiquark pair (or dijet) production at the electron-ion collider (EIC) has been argued to be one of most important processes that allowing to access the Weizsäcker-Williams (WW) gluon distributions at small $x$ limit. Within the framework of Color Glass Condensate (CGC) effective field theory (EFT), we calculated the dijet cross sections and the azimuthal correlations by including the Sudakov resummations, numerical results shown that the back-to-back correlations are significantly suppressed when the Sudakov resummations are taken into account. In addition, by using the solutions of running-coupling Balitsky-Kovchegov (rcBK) equation, the unpolarized and linearly polarized WW gluon distributions both in coordinate and momentum space are presented.

   hep-phPRD(2021)·19 citations
4. 04*

   Reentrant pion superfluidity and cosmic trajectories within PNJL model

   Gaoqing Cao🇨🇳 · Lianyi He🇨🇳 · Pengming Zhang🇨🇳

   In this work, we self-consistently explore the possibility of charged pion superfluidity and cosmic trajectories in early Universe under the framework of Polyakov-Nambu--Jona-Lasinio model. By taking the badly constrained lepton flavor asymmetries $l_{\mathrm{e}}$ and $l_{\mu }$ as free parameters, the upper boundaries of pion superfluidity phase are consistently found to be around the pseudocritical temperature at zero chemical potentials. So the results greatly support the choice of $T=0.16\mathrm{GeV}$ as the upper boundary of pion superfluidity in the previous lattice QCD study. Take $l_{\mathrm{e}}+l_{\mu }=-0.2$ as an example, we demonstrate the features of pion condensation and the associated cosmic trajectories with the evolution of early Universe. While the trajectory of electric chemical potential reacts strongly at both the lower and upper boundaries of reentrant pion superfluidity, the trajectories of other chemical potentials only respond strongly at the upper boundary.

   hep-phnucl-thPRD(2021)·13 citations
5. 05*

   One way to verify the molecular picture of exotic hadrons --from $DK$ to $DDK/D{\bar{D}}^{(\ast )}K$

   Tian-Wei Wu🇨🇳 · Ming-Zhu Liu🇨🇳 · Li-Sheng Geng🇨🇳

   Starting from 2003, a large number of the so-called exotic hadrons, such as $X(3872)$ and $D_{s0}^{\ast }(2317)$, were discovered experimentally. Since then, understanding the nature of these states has been a central issue both theoretically and experimentally. As many of these states are located close to two hadron thresholds, they are believed to be molecular states or at least contain large molecular components. We argue that if they are indeed molecular states, in the way that the deuteron is a bound state of proton and neutron, then molecular states of three or more hadrons are likely, in the sense that atomic nuclei are bound states of nucleons. Following this conjecture, we study the likely existence of $DDK$, $D\bar{D}K$, and $D{\bar{D}}^{\ast }K$ molecular states. We show that within the theoretical uncertainties of the two-body interactions deduced, they most likely exist. Furthermore, we predict their strong decays to help guide future experimental searches. In addition, we show that the same approach can indeed reproduce some of the known three-body systems from the two-body inputs, such as the deuteron-triton and the $\Lambda (1405)$-$\bar{K}NN$ systems.

   hep-phhep-exFew Body Syst.(2021)·14 citations
6. 06*

   Artificial proto-modelling with simplified-model results from the LHC

   Sabine Kraml🇫🇷 · Andre Lessa🇧🇷 · Wolfgang Waltenberger🇦🇹

   We present a novel approach to identify potential dispersed signals of new physics in the slew of published LHC results. It employs a random walk algorithm to introduce sets of new particles, dubbed "proto-models", which are tested against simplified-model results from ATLAS and CMS searches for new physics by exploiting the SModelS software framework. A combinatorial algorithm identifies the set of analyses and/or signal regions that maximally violates the Standard Model hypothesis, while remaining compatible with the entirety of LHC constraints in our database. Crucial to the method is the ability to construct a reliable likelihood in proto-model space; we explain the various approximations which are needed depending on the information available from the experiments, and how they impact the whole procedure.

   hep-ph1 citation
7. 07*

   An update on the two singlet Dark Matter model

   Tanushree Basak🇮🇳 · Baradhwaj Coleppa🇮🇳 · Kousik Loho🇮🇳

   We revisit the two real singlet extension of the Standard Model with a $Z_2\times Z_2^{\prime }$ symmetry. One of the singlet scalars $S_2$, by virtue of an unbroken $Z_2^{\prime }$ symmetry, plays the role of a stable dark matter candidate. The other scalar $S_1$, with spontaneously broken $Z_2$-symmetry, mixes with the SM Higgs boson and acts as the scalar mediator. We analyze the model by putting in the entire set of theoretical and recent experimental constraints. The latest bounds from direct detection Xenon1T experiment severely restricts the allowed region of parameter space of couplings. To ensure the dark matter satisfies the relic abundance criterion, we rely on the Breit-Wigner enhanced annihilation cross-section. Further, we study the viability of explaining the observed gamma-ray excess in the galactic center in this model with a dark matter of mass in the $\sim 36-51$ GeV window and present our conclusions.

   hep-phJHEP(2021)·12 citations
8. 08*

   Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

   Yonghee Kim🇯🇵 · Yan-Rui Liu🇨🇳 · Makoto Oka🇯🇵 · Kei Suzuki🇯🇵

   Chiral effective theory of scalar and vector diquarks is formulated according to the linear sigma model. The main application is to describe the ground and excited states of singly heavy baryons with a charm or bottom quark. Applying the potential quark model between the diquark and the heavy quark ($Q=c,b$), we construct a heavy-quark--diquark model. The spectra of the positive- and negative-parity states of ${\Lambda }_Q$, ${\Sigma }_Q$, ${\Xi }_Q^{{(}^{\prime })}$ and ${\Omega }_Q$ are obtained. The masses and interaction parameters of the effective theory are fixed partly from the lattice QCD data and also from fitting low-lying heavy baryon masses. We find that the negative parity excited states of ${\Xi }_Q$ (flavor $\bar{3}$) are different from those of ${\Lambda }_Q$, because of the inverse hierarchy of the pseudoscalar diquark. On the other hand, ${\Sigma }_Q,{\Xi }_Q^{\prime }$ and ${\Omega }_Q$ (flavor $6$) baryons have similar spectra. We compare our results of the heavy-quark--diquark model with experimental data as well as the quark model.

   hep-phhep-exnucl-exnucl-thPRD(2021)·27 citations
9. 09*

   The CKM Phase and $\bar{\theta }$ in Nelson-Barr Models

   Alessandro Valenti🇮🇹 · Luca Vecchi🇮🇹

   We analyze the Nelson-Barr approach to the Strong CP Problem. We derive the necessary conditions in order to simultaneously reproduce the CKM phase and the quark masses. Then we quantify the irreducible contributions to the QCD topological angle, namely the corrections arising from loops of the colored fermion mediators that characterize these models. Corrections analytic in the couplings first arise at 3-loop order and are safely below current bounds; non-analytic effects are 2-loop order and decouple as the mediators exceed a few TeV. We discuss collider, electroweak, and flavor bounds and argue that most of the parameter space above the TeV scale is still allowed in models with down-type mediators, whereas other scenarios are more severely constrained. With two or more families of mediators the dominant experimental bound is due to the neutron electric dipole moment.

   hep-phJHEP(2021)·49 citations
10. 10*

    Covalent hadronic molecules induced by shared light quarks

    Hua-Xing Chen🇨🇳

    After examining the Feynman diagrams corresponding to the ${\bar{D}}^{(\ast )}{\Sigma }_c^{(\ast )}$, ${\bar{D}}^{(\ast )}{\Lambda }_c$, $D^{(\ast )}{\bar{K}}^{\ast }$, and $D^{(\ast )}{\bar{D}}^{(\ast )}$ hadronic molecular states, we propose a possible binding mechanism induced by shared light quarks. This mechanism is similar to the covalent bond in chemical molecules induced by shared electrons. We use the method of QCD sum rules to calculate its corresponding light-quark-exchange diagrams, and the obtained results indicate a model-independent hypothesis: the light-quark-exchange interaction is attractive when the shared light quarks are totally antisymmetric so that obey the Pauli principle. We build a toy model with four parameters to formulize this picture, and estimate binding energies of some possibly-existing covalent hadronic molecules. A unique feature of this picture is that binding energies of the $(I)J^P=(0)1^{+}$ $D{\bar{B}}^{\ast }/D^{\ast }\bar{B}$ hadronic molecules are much larger than those of the $(I)J^P=(0)1^{+}$ $D{D}^{\ast }/\bar{B}{\bar{B}}^{\ast }$ ones, while the $(I)J^P=(1/2)1/2^{+}$ $\bar{D}{\Sigma }_c/\bar{D}{\Sigma }_b/B{\Sigma }_c/B{\Sigma }_b$ hadronic molecules have similar binding energies.

    hep-phCommun.Theor.Phys.(2022)·13 citations
11. 11*

    Impact of a positron beam at JLab on an unbiased determination of DVCS Compton Form Factors

    H. Dutrieux🇫🇷 · V. Bertone🇫🇷 · H. Moutarde🇫🇷 · P. Sznajder🇵🇱

    The impact of potential future measurements of beam charge asymmetries on the current knowledge of Compton form factors is evaluated. Elaborating on the results of a global neural network fit to deeply virtual Compton scattering data, a Bayesian reweighting analysis quantifies the improved determination of the real part of the Compton form factor $\mathcal{H}$. Such an improvement is particularly relevant for the experimental determination of the proton mechanical properties or for universality studies of generalized parton distributions through analyses of virtual Compton scattering in both spacelike and timelike regions.

    hep-phhep-exnucl-exEPJA(2021)·11 citations
12. 12*

    Potential and limitations of machine-learning approaches to inclusive $|V_{ub}|$ determinations

    Anke Biekötter🇬🇧 · Ka Wang Kwok🇬🇧 · Benjamin D. Pecjak🇬🇧

    The determination of $|V_{ub}|$ in inclusive semileptonic $B\to X_u\ell \nu$ decays will be among the pivotal tasks of Belle II. In this paper we study the potential and limitations of machine learning approaches that attempt to reduce theory uncertainties by extending the experimentally accessible fiducial region of the $B\to X_u\ell \nu$ signal into regions where the $B\to X_c\ell \nu$ background is dominant. We find that a deep neural network trained on low-level single particle features offers modest improvement in separating signal from background, compared to BDT set-ups using physicist-engineered high-level features. We further illustrate that while the signal acceptance of such a deep neural network deteriorates in kinematic regions where the signal is small, such as at high hadronic invariant mass, neural networks which exclude kinematic features are flatter in kinematics but less inclusive in the sampling of exclusive hadronic final states at fixed kinematics. The trade-off between these two set-ups is somewhat Monte Carlo dependent, and we study this issue using the multipurpose event generator Sherpa in addition to the widely used $B$-physics tool EvtGen.

    hep-phJHEP(2022)·0 citations
13. 13*

    Anomalous Jet Identification via Sequence Modeling

    Alan Kahn🇺🇸 · Julia Gonski🇺🇸 · Inês Ochoa🇵🇹 · Daniel Williams🇺🇸 · Gustaaf Brooijmans🇺🇸

    This paper presents a novel method of searching for boosted hadronically decaying objects by treating them as anomalous elements of a contaminated dataset. A Variational Recurrent Neural Network (VRNN) is used to model jets as sequences of constituent four-vectors. After applying a pre-processing method which boosts each jet to the same reference mass and energy, the VRNN provides each jet an Anomaly Score that distinguishes between the structure of signal and background jets. The model is trained in an entirely unsupervised setting and without high level variables, making the score more robust against mass and $p_T$ correlations when compared to methods based primarily on jet substructure. Performance is evaluated on the jet level, as well as in an analysis context by searching for a heavy resonance with a final state of two boosted jets. The Anomaly Score shows consistent performance along a wide range of signal contamination amounts, for both two and three-pronged jet substructure hypotheses. Analysis results demonstrate that the use of Anomaly Score as a classifier enhances signal sensitivity while retaining a smoothly falling background jet mass distribution. The model's discriminatory performance resulting from an unsupervised training scenario opens up the possibility to train directly on data without a pre-defined signal hypothesis.

    hep-phJINST(2021)·37 citations
14. 14*

    Factorization of Power Corrections in the Drell-Yan Process in EFT

    Matthew Inglis-Whalen🇨🇦 · Michael Luke🇨🇦 · Jyotirmoy Roy🇨🇦 · Aris Spourdalakis🇨🇦

    We examine the quark-induced Drell-Yan process at next-to-leading power (NLP) in Soft-Collinear Effective Theory. Using an approach with no explicit soft or collinear modes, we discuss the factorization of the differential cross section in the small-$q_T$ hierarchy with $q^2\gg q_T^2\gg {\Lambda }_{\mathrm{QCD}}^2$. We show that the cross section may be written in terms of matrix elements of power-suppressed operators $T_{(i,j)}$, which contribute to $O(q_T^2/q^2)$ coefficients of the usual parton distribution functions. We derive a factorization for this observable at NLP which allows the large logarithms in each of the relevant factors to be resummed. We discuss the cancellation of rapidity divergences and the overlap subtractions required to eliminate double counting at next-to-leading power.

    hep-phPRD(2021)·22 citations
15. 15*

    New Interference Effects from Light Gauge Bosons in Neutrino-Electron Scattering

    P. S. Bhupal Dev🇺🇸 · Doojin Kim🇺🇸 · Kuver Sinha🇺🇸 · Yongchao Zhang🇨🇳

    We point out that light gauge boson mediators could induce new interference effects in neutrino-electron scattering that can be used to enhance the sensitivity of neutrino-flavor-selective high-intensity neutrino experiments, such as DUNE. We particularly emphasize a destructive interference effect, leading to a deficit between the Standard Model expectation and the experimental measurement of the differential cross-sections, which is prominent only in either the neutrino or the antineutrino mode, depending on the mediator couplings. Therefore, the individual neutrino (or antineutrino) mode could allow for sensitivity reaches superior to the combined analysis, and moreover, could distinguish between different types of gauge boson mediators.

    hep-phhep-exPRD(2021)·15 citations
16. 16*

    GeV-scale neutrinos: interactions with mesons and DUNE sensitivity

    Manuel Gonzalez-Lopez🇪🇸

    The simplest extension of the SM to account for the observed neutrino masses and mixings is the addition of at least two singlet fermions (or right-handed neutrinos). If their masses lie at or below the GeV scale, such new fermions would be produced in meson decays. Similarly, provided they are sufficiently heavy, their decay channels may involve mesons in the final state. In this work, we provide consistent expressions for the relevant effective operators involving neutrinos and mesons with masses up to 2 GeV. The associated effective Lagrangian has been implemented in FeynRules, allowing for efficient simulation in event generators such as MadGraph5. As an application of this setup, we numerically compute the expected sensitivity of the DUNE near detector to heavy neutrinos in the MeV-GeV range.

    hep-ph0 citations
17. 17*

    Operator Bases in Effective Field Theories with Sterile Neutrinos: $d\le 9$

    Hao-Lin Li🇨🇳 · Zhe Ren🇨🇳 · Ming-Lei Xiao🇨🇳 · Jiang-Hao Yu🇨🇳 · Yu-Hui Zheng🇨🇳

    We obtain the complete and independent bases of effective operators at mass dimension 5, 6, 7, 8, 9 in both standard model effective field theory with light sterile right-handed neutrinos ($\nu$SMEFT) and low energy effective field theory with light sterile neutrinos ($\nu$LEFT). These theories provide systematical parametrizations on all possible Lorentz-invariant physical effects involving in the Majorana/Dirac neutrinos, with/without the lepton number violations. In the $\nu$SMEFT, we find that there are 2 (18), 29 (1614), 80 (4206), 323 (20400), 1358 (243944) independent operators with sterile neutrinos included at the dimension 5, 6, 7, 8, 9 for one (three) generation of fermions, while 24, 5223, 3966, 25425, 789426 independent operators in the $\nu$LEFT.

    hep-phJHEP(2021)·89 citations
18. 18*

    Form Factor Counting and HQET Matching for New Physics in ${\Lambda }_b\to {\Lambda }_c^{\ast }l\nu$

    Michele Papucci🇺🇸 · Dean J. Robinson🇺🇸

    We calculate the ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595)l\nu$ and ${\Lambda }_b\to {\Lambda }_c^{\ast }(2625)l\nu$ form factors and decay rates for all possible $b\to cl\bar{\nu }$ four-Fermi interactions in and beyond the Standard Model (SM), including nonzero charged lepton masses and terms up to order $\mathcal{O}({\alpha }_s,1/m_{c,b})$ in the heavy quark effective theory (HQET). We point out a subtlety involving the overcompleteness of the representation of the spin-parity $1/2^{+}\to 3/2^{-}$ antisymmetric tensor form factors, relevant also to other higher excited-state transitions, and present a general method for the counting of the physical form factors for any hadronic transition matrix element and their matching onto HQET. We perform a preliminary fit of a simple HQET-based parametrization of the ${\Lambda }_b\to {\Lambda }_c^{\ast }$ form factors at $\mathcal{O}({\alpha }_s,1/m_{c,b})$ to an existing quark model, providing preliminary predictions for the lepton universality ratios $R({\Lambda }_c^{\ast })$ beyond the SM. Finally, we examine the possible incompatibility of recent lattice QCD results with expectations from the heavy-quark expansion and available experimental data.

    hep-phPRD(2022)·21 citations
19. 19*

    Charm-quark mass effects in NRQCD matching coefficients and the leptonic decay of the ${\rm Y}(1S)$ meson

    Manuel Egner🇩🇪 · Matteo Fael🇩🇪 · Jan Piclum🇩🇪 · Kay Schoenwald🇩🇪 · Matthias Steinhauser🇩🇪

    We compute two-loop corrections to the vector current matching coefficient involving two heavy quark masses. The result is applied to the computation of the ${\rm Y}(1S)$ decay width into an electron or muon pair. We complement the next-to-next-to-next-to-leading order corrections of Ref. arXiv:1401.3005 by charm quark mass effects up to second order in perturbation theory. Furthermore, we apply the formalism to $\Gamma (J/\Psi \to {\ell }^{+}{\ell }^{-})$ and compare to the experimental data.

    hep-phPRD(2021)·9 citations
20. 20*

    Instability of a uniform electric field in pure non-Abelian Yang-Mills theory

    Carlos Cardona🇺🇸 · Tanmay Vachaspati🇺🇸

    We study the Schwinger process in a uniform non-Abelian electric field using a dynamical approach in which we evolve an initial quantum state for gluonic excitations. We evaluate the spectral energy density and number density in the excitations as functions of time. The total energy density has an ultraviolet divergence which we argue gets tamed due to asymptotic freedom, leading to $g^4{E}^4{t}^4$ growth, where $g$ is the coupling and $E$ the electric field strength. We also find an infrared divergence in the number density of excitations whose resolution requires an effect such as confinement.

    ↳ hep-thhep-phPRD(2021)·10 citations
21. 21*

    Complementary consistency test of the Copernican principle via Noether's theorem and machine learning forecasts

    Rubén Arjona🇪🇸 · Savvas Nesseris🇪🇸

    The Copernican principle (CP), i.e. the assumption that we are not privileged observers of the Universe, is a fundamental tenet of the standard cosmological model. A violation of this postulate implies the possibility that the apparent cosmic acceleration could be explained without the need of a cosmological constant, dark energy or paper we present a new test of the CP relating the distance and the expansion rate, derived via Noether's theorem, which is complementary to other tests found in the literature. We also simulate fiducial data based on upcoming stage IV galaxy surveys and use them to reconstruct the Hubble rate $H(z)$ and the angular diameter distance $d_A(z)$ in order to forecast how well our null test can constrain deviations from the cosmological constant model. We find that our new test can easily rule out several scenarios based on the Lema\^ıtre-Tolman-Bondi void model at confidence of $\gtrsim 3\sigma$ at middle to high redshifts ($z>0.5$).

    ↳ astro-ph.COgr-qchep-phPRD(2021)·14 citations
22. 22*

    Meson-exchange currents and superscaling analysis with relativistic effective mass of quasielastic electron scattering from ${}^{12}$C

    V.L. Martinez-Consentino🇪🇸 · I. Ruiz Simo🇪🇸 · J.E. Amaro🇪🇸

    We reanalyze the scaling properties of inclusive quasielastic electron scattering from ${}^{12}$C by subtracting from the data the effects of two-particle emission. A model of relativistic meson-exchange currents (MEC) is employed within the mean field theory of nuclear matter, with scalar and vector potentials that induce an effective mass and a vector energy to the nucleons. A new phenomenological quasielastic scaling function is extracted from a selection of the data after the subtraction of the 2p-2h contribution. The resulting superscaling approach with relativistic effective mass (SuSAM*) can be used to compute the genuine quasielastic cross section without contamination of the 2p-2h channel that can then be added separately to obtain the total quasielastic plus two-nucleon emission response.

    ↳ nucl-thhep-phPRC(2021)·25 citations
23. 23*

    Dark energy-dark matter interactions as a solution to the $S_8$ tension

    Matteo Lucca🇧🇪

    In this work we consider a scenario where the dark energy is a dynamical fluid whose energy density can be transferred to the dark matter via a coupling function proportional to the energy density of the dark energy. In particular, we investigate this model's ability to address the $S_8$ tension and find that against data from Planck, BAO and Pantheon the model 1) can significantly reduce the significance of the tension, 2) does so without exacerbating nor introducing any other tension (such as the $H_0$ tension) and 3) without worsening the fit to the considered data sets with respect to the $\Lambda$CDM model. We also test the model against data from weak lensing surveys such as KiDS and DES, and find that the model's ability to address the $S_8$ tension further improves, without a significant impact on any other parameter nor statistical measure.

    ↳ astro-ph.COgr-qchep-phPhys.Dark Univ.(2021)·103 citations
24. 24*

    Cosmological black holes are not described by the Thakurta metric: LIGO-Virgo bounds on PBHs remain unchanged

    Gert Hütsi🇪🇪 · Tomi Koivisto🇪🇪 · Martti Raidal🇪🇪 · Ville Vaskonen🇪🇸 · Hardi Veermäe🇪🇪

    We show that the physical conditions which induce the Thakurta metric, recently studied by Bœhm {\it et al.} in the context of time-dependent black hole masses, correspond to a single accreting black hole in the entire Universe filled with isotropic non-interacting dust. In such a case, the physics of black hole accretion is not local but tied to the properties of the whole Universe. We show that radiation, primordial black holes or particle dark matter cannot produce the specific energy flux required for supporting the mass growth of Thakurta black holes. In particular, this solution does not apply to black hole binaries. We conclude that cosmological black holes and their mass growth cannot be described by the Thakurta metric, and thus existing constraints on the primordial black hole abundance from the LIGO-Virgo and the CMB measurements remain valid.

    ↳ astro-ph.COgr-qchep-phhep-thEPJC(2021)·33 citations
25. 25*

    Black hole induced false vacuum decay from first principles

    Andrey Shkerin🇺🇸 · Sergey Sibiryakov🇨🇦

    We provide a method to calculate the rate of false vacuum decay induced by a black hole. The method uses complex tunneling solutions and consistently takes into account the structure of different quantum vacua in the black hole metric via boundary conditions. The latter are connected to the asymptotic behavior of the time-ordered Green's function in the corresponding vacua. We illustrate the technique on a two-dimensional toy model of a scalar field with inverted Liouville potential in an external background of a dilaton black hole. We analytically derive the exponential suppression of tunneling from the Boulware, Hartle-Hawking and Unruh vacua and show that they are parametrically different. The Unruh vacuum decay rate is exponentially smaller than the decay rate of the Hartle-Hawking state, though both rates become unsuppressed at high enough black hole temperature. We interpret the vanishing suppression of the Unruh vacuum decay at high temperature as an artifact of the two-dimensional model and discuss why this result can be modified in the realistic case of black holes in four dimensions.

    ↳ hep-thgr-qchep-phJHEP(2021)·51 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.