Mon·Oct 12, 2020Monday·October 12, 2020

1. 01*

   Luminous solar neutrinos I: Dipole portals

   Ryan Plestid🇺🇸

   Solar neutrinos upscattering inside the Earth can source unstable particles that can decay inside terrestrial detectors. Contrary to naive expectations we show that when the decay length is much shorter than the radius of the \emph{Earth} (rather than the detector), the event rate is independent of the decay length. In this paper we study a transition dipole operator (neutrino dipole portal) and show that Borexino's existing data probes previously untouched parameter space in the 0.5--20 MeV regime, complementing recent cosmological and supernova bounds. We briefly comment on similarities and differences with luminous dark matter and comment on future prospects for analogous signals stemming from atmospheric neutrinos.

   hep-phastro-ph.HEastro-ph.SRPRD(2021)·59 citations
2. 02*

   Gravitational form factors and mechanical properties of proton in a light-front quark-diquark model

   Dipankar Chakrabarti🇮🇳 · Chandan Mondal🇨🇳 · Asmita Mukherjee🇮🇳 · Sreeraj Nair🇨🇳 · Xingbo Zhao🇨🇳

   We obtain the gravitational form factors (GFFs) and investigate their applications for the description of the mechanical properties, i.e., the distributions of pressures, shear forces inside proton, and the mechanical radius, in a light-front quark-diquark model constructed by the soft-wall AdS/QCD. The GFFs, $A(Q^2)$ and $B(Q^2)$ are found to be consistent with the lattice QCD, while the qualitative behavior of the $D$-term form factor is in agreement with the extracted data from the deeply virtual Compton scattering (DVCS) experiments at JLab, the lattice QCD, and the predictions of different phenomenological models. The pressure and shear force distributions are also consistent with the results of different models.

   hep-phPRD(2020)·59 citations
3. 03*

   Explaining Atomki anomaly and muon $g-2$ in $U(1{)}_X$ extended flavour violating two Higgs doublet model

   Takaaki Nomura🇰🇷 · Prasenjit Sanyal🇰🇷

   We investigate a two Higgs doublet model with extra flavour depending $U(1{)}_X$ gauge symmetry where $Z^{\prime }$ boson interactions can explain the Atomki anomaly by choosing appropriate charge assignment for the SM fermions. For parameter region explaining the Atomki anomaly we obtain light scalar boson with $\mathcal{O}(10)$ GeV mass, and we explore scalar sector to search for allowed parameter space. We then discuss anomalous magnetic dipole moment of muon and lepton flavour violating processes induced by Yukawa couplings of our model.

   hep-phJHEP(2021)·21 citations
4. 04*

   Spectroscopic properties of $\Delta$ Baryons

   Chandni Menapara🇮🇳 · Zalak Shah🇮🇳 · Ajay Kumar Rai🇮🇳

   The resonance state of $\Delta$ baryon existing in four isospin ($I=\frac{3}{2}$) states, has been studied using Hypercentral Constituent Quark Model (hCQM) with a simple linear potential with added first order correction. The calculated data range for 1S-5S, 1P-5P, 1D-4D and 1F-2F with possible spin-parity assignments of all the states. The magnetic moments have also been obtained for all four configuration. The $N\pi$ decay channel width has been calculated for few states. The linear nature of the data has been verified through Regge trajectories.

   hep-phnucl-thCPC(2021)·33 citations
5. 05*

   Precise Capture Rates of Cosmic Neutrinos and Their Implications on Cosmology

   Kensuke Akita🇯🇵 · Saul Hurwitz🇯🇵 · Masahide Yamaguchi🇯🇵

   We explore the potential of measurements of cosmological effects, such as neutrino spectral distortions from the neutrino decoupling and neutrino clustering in our Galaxy, via cosmic neutrino capture on tritium. We compute the precise capture rates of each neutrino species including such cosmological effects to probe them. These precise estimates of capture rates are also important in that the would-be deviation of the estimated capture rate could suggest new neutrino physics and/or a non-standard evolution of the universe. In addition, we discuss the precise differences between the capture rates of Dirac and Majorana neutrinos for each species, the required energy resolutions to detect each neutrino species and the method of reconstruction of the spectrum of cosmic neutrinos via the spectrum of emitted electrons, with emphasis on the PTOLEMY experiment.

   hep-phastro-ph.COhep-exEPJC(2021)·14 citations
6. 06*

   Taming the ${ϵ}_K$ in Little Randall Sundrum Models

   Giancarlo D'Ambrosio🇮🇹 · Mathew Thomas Arun🇮🇳 · Ashwani Kushwaha🇮🇳 · Sudhir K. Vempati🇮🇳

   The Randall Sundrum (RS) models receive significant constraints from the neutral Kaon system. The CP violating observable ${ϵ}_K$, in Randall Sundrum scenario, requires the lightest KK gluon to be heavier than $\sim$ 24 TeV. The constraint is even stronger in the Little Randall Sundrum models (LRS), $\gtrsim$ 32 TeV. The LRS models are motivated for their possible visibility at the Large Hardon Collider (LHC). We show that the stringent constraints from K-physics can be relaxed in the LRS models, in the presence of the Brane Localised Kinetic Terms (BLKT). In particular, for a range of values, a UV BLKT could significantly modify the lightest KK gluon wave function such that the limit can reduces to 5 TeV. We also show that such a relaxation of the constraints can also be achieved by imposing flavour symmetries à la } Minimal Flavour Protection.

   hep-phPRD(2021)·2 citations
7. 07*

   Vector dark matter production from inflation with symmetry breaking

   Borna Salehian🇮🇷 · Mohammad Ali Gorji🇯🇵 · Hassan Firouzjahi🇮🇷 · Shinji Mukohyama🇯🇵

   We present a scenario of vector dark matter production from symmetry breaking at the end of inflation. In this model, the accumulated energy density associated with the quantum fluctuations of the dark photon accounts for the present energy density of dark matter. The inflaton is a real scalar field while a heavy complex scalar field, such as the waterfall of hybrid inflation, is charged under the dark gauge field. After the heavy field becomes tachyonic at the end of inflation, rolling rapidly towards its global minimum, the dark photon acquires mass via the Higgs mechanism. To prevent the decay of the vector field energy density during inflation, we introduce couplings between the inflaton and the gauge field such that the energy is pumped to the dark sector. The setup can generate the observed dark matter abundance for a wide range of the dark photon's mass and with the reheat temperature around $10^{12}$ GeV. The model predicts the formation of cosmic strings at the end of inflation with the tensions which are consistent with the CMB upper bounds.

   hep-phastro-ph.COgr-qchep-thPRD(2021)·50 citations
8. 08*

   Processes ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ and $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ in the chiral NJL model with final state interactions taken into account

   M. K. Volkov🇷🇺 · A. B. Arbuzov🇷🇺 · A. A. Pivovarov🇷🇺

   The processes ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ and $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ are considered within the chiral Nambu--Jona-Lasinio model with taking into account the pion final state interactions beyond the leading $1/N_c$ approximation. The contribution of the loop correction caused by a $\rho$ meson exchange between the pions, which gives the main contribution in the P-wave channel, is caclulated. The results for both processes are in a satisfactory agreement with experimental data.

   hep-phPisma Zh.Eksp.Teor.Fiz.(2020)·1 citation
9. 09*

   Decay properties of $N^{\ast }(1895)$

   K. P. Khemchandani🇧🇷 · A. Martinez Torres🇧🇷 · H. Nagahiro🇯🇵 · A. Hosaka🇯🇵

   The nature of nucleon resonances is still being debated, while much experimental data are accumulated. In this work, we focus on the negative parity resonance $N^{\ast }(1895)$ which is located in the scattering region of various meson-baryon coupled channels, and such dynamics can be crucial in understanding its properties. To test the relevance of such hadron dynamics, we investigate the decay properties of $N^{\ast }(1895)$ in detail. We examine how a two pole nature of $N^{\ast }(1895)$ is compatible with its observed decay properties. Moreover, we find that the resonance decays into final states involving $\Lambda (1405)$ and $\Sigma (1400)$, where the latter is not yet observed experimentally. Such decay processes can be useful to study the properties of the aforementioned hyperon resonances.

   hep-phnucl-thPRD(2021)·13 citations
10. 10*

    Impact of LHC jet data on Parton Distribution Functions

    Joao Pires🇵🇹

    In this talk we discuss recent results on the impact of LHC jet data on global fits of parton distribution functions using theoretical predictions at NNLO in QCD supplemented by electroweak (EW) corrections.

    hep-phhep-exPoS(2021)·0 citations
11. 11*

    The $U$ boson, interpolating between a generalized dark photon or dark $Z$, an axial boson and an axionlike particle

    Pierre Fayet🇫🇷

    A light boson $U$ from an extra $U(1)$ interpolates between a generalized dark photon coupled to $Q,B$ and $L_i$ (or $B-L$), plus possibly dark matter, a dark $Z$ coupled to the $Z$ current, and one axially coupled to quarks and leptons. We identify the corresponding $U(1{)}_F$ symmetries, with $F={\gamma }_{Y}Y+{\gamma }_{B}B+{\gamma }_{L_i}{L}_i+{\gamma }_A{F}_A+{\gamma }_{F^{\prime }}{F}^{\prime }+{\gamma }_d{F}_d$, $F_d$ acting in a dark sector and $F^{\prime }$ on possible semi-inert BEH doublets uncoupled to quarks and leptons. The $U$ current is obtained from the $U(1{)}_F$ and $Z$ currents, with a mixing determined by the spin-0 BEH fields. The charge $Q_U$ of chiral quarks and leptons is a combination of $Q,B,L_i$ and $T_{3L}$ with the axial $F_A$. It involves in general isovector and isoscalar axial terms, in the presence of two BEH doublets. A longitudinal $U$ with axial couplings has enhanced interactions, and behaves much as an axionlike particle. Its axial couplings $g_A$, usually restricted to $<2\times 10^{-7}{m}_U$(MeV), lead to effective pseudoscalar ones $g_P=g_A\times 2m_{q,l}/m_U=2^{1/4}{G}_F^{1/2}{m}_{q,l}{A}_{\pm }$. $A_{\pm }$ is proportional to an invisibility parameter $r=\cos {\theta }_A$ induced by a singlet v.e.v., possibly large and allowing the $U$ to be very weakly interacting. This allows for a very small gauge coupling, expressed with two doublets and a singlet as $g"/4\simeq 2\times 10^{-6}{m}_U$(MeV) $r/\sin 2\beta$. We discuss phenomenological implications for meson decays, neutrino interactions, atomic-physics parity violation, naturally suppressed ${\pi }^0\to \gamma U$ decays, etc.. The $U$ boson fits within the grand-unification framework, in symbiosis with a $SU(4{)}_{\mathrm{es}}$ electrostrong symmetry broken at the GUT scale, with $Q_U$ depending on $Q,B-L,F_A$ and $T_{3A}$ through three parameters ${\gamma }_Y,{\gamma }_A$ and $\eta$.

    hep-phhep-exhep-thPRD(2021)·29 citations
12. 12*

    Triphoton production at hadron colliders in NNLO QCD

    Stefan Kallweit🇮🇹 · Vasily Sotnikov🇩🇪 · Marius Wiesemann🇩🇪

    We present next-to-next-to-leading-order (NNLO) QCD corrections to the production of three isolated photons in hadronic collisions at the fully differential level. We employ qT subtraction within MATRIX and an efficient implementation of analytic two-loop amplitudes in the leading-colour approximation to achieve the first on-the-fly calculation for this process at NNLO accuracy. Numerical results are presented for proton-proton collisions at energies ranging from 7 TeV to 100 TeV. We find full agreement with the 8 TeV results of arXiv:1911.00479 and confirm that NNLO corrections are indispensable to describe ATLAS 8 TeV data. In addition, we demonstrate the significance of NNLO corrections for future precision studies of triphoton production at higher collision energies.

    hep-phhep-exPLB(2021)·119 citations
13. 13*

    Hybrid calculation of the MSSM Higgs boson masses using the complex THDM as EFT

    Henning Bahl🇩🇪 · Nick Murphy🇩🇰 · Heidi Rzehak🇩🇰

    Recently, the Higgs boson masses in the Minimal Supersymmetric Standard Model (MSSM) and their mixing have been calculated using the complex Two-Higgs-DoubletModel (cTHDM) as an effective field theory (EFT) of the MSSM. Here, we discuss the implementation of this calculation, which we improve in several aspects, into the hybrid framework of FeynHiggs by combing the cTHDM-EFT calculation with the existing fixed-order calculation. This combination allows accurate predictions also in the intermediate regime where some SUSY particles are relatively light, some relatively heavy and some in between. Moreover, the implementation provides precise predictions for the Higgs decay rates and production cross-sections.

    hep-phEPJC(2021)·17 citations
14. 14*

    Signs, Spin, SMEFT: Sum Rules at Dimension Six

    Grant N. Remmen🇺🇸 · Nicholas L. Rodd🇺🇸

    We place theoretical constraints on the leading deviations to four-fermion standard model interactions. Invoking S-matrix analyticity and partial wave unitarity, we develop new dispersion relations that yield either spin-dependent sum rules on dimension-six fermionic operators or information about the amplitude's behavior at large momentum. The pattern of SMEFT inequalities we find for theories obeying certain large-momentum constraints enables a diagnosis of properties of emerging new physics. These relations form a bridge between new physics searches: discovery of flavor-violating $\tau$ decays at Belle II would motivate the search for flavor-conserving new physics below 25 TeV, as the results would provide definitive information about the UV.

    hep-phhep-thPRD(2022)·65 citations
15. 15*

    The Scalar Chemical Potential in Cosmological Collider Physics

    Arushi Bodas🇺🇸 · Soubhik Kumar🇺🇸 · Raman Sundrum🇺🇸

    Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the "direct detection" of particles with masses as large as the inflationary Hubble scale ($H$). However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed $H$. In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars. The operator has a "chemical potential" form, which harnesses the large kinetic energy scale of the inflaton, ${\dot{\varphi }}_0^{1/2}\approx 60H$, to act as an efficient source of scalar particle production. Derivative couplings of inflaton ensure radiative stability of the slow-roll potential, which in turn maintains (approximate) scale-invariance of the inflationary correlations. We show that a signal not suffering Boltzmann suppression can be obtained in the bispectrum with strength $f_{\mathrm{NL}}\sim \mathcal{O}(0.01-10)$ for an extended range of scalar masses, $M\lesssim {\dot{\varphi }}_0^{1/2}$, potentially as high as $10^{15}$ GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm experiments. The mechanism does not invoke any particular fine-tuning of parameters or breakdown of perturbation-theoretic control. The leading contribution appears at tree-level, which makes the calculation analytically tractable and removes the loop-suppression as compared to earlier chemical potential studies of non-zero spins. The steady particle production allows us to infer the effective mass of the heavy particles and the chemical potential from the variation in bispectrum oscillations as a function of co-moving momenta. Our analysis sets the stage for generalization to heavy bosons with non-zero spin.

    hep-phastro-ph.COJHEP(2021)·104 citations
16. 16*

    Bottomonium suppression and elliptic flow using Heavy Quarkonium Quantum Dynamics

    Ajaharul Islam🇺🇸 · Michael Strickland🇺🇸

    We introduce a framework called Heavy Quarkonium Quantum Dynamics (HQQD) which can be used to compute the dynamical suppression of heavy quarkonia propagating in the quark-gluon plasma using real-time in-medium quantum evolution. Using HQQD we compute large sets of real-time solutions to the Schrödinger equation using a realistic in-medium complex-valued potential. We sample 2 million quarkonia wave packet trajectories and evolve them through the QGP using HQQD to obtain their survival probabilities. The computation is performed using three different HQQD model parameter sets in order to estimate our systematic uncertainty. After taking into account final state feed down we compare our results to existing experimental data for the suppression and elliptic flow of bottomonium states and find that HQQD predictions are good agreement with available data for $R_{AA}$ as a function of $N_{\mathrm{part}}$ and $p_T$ collected at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. In the case of $v_2$ for the various states, we find that the path-length dependence of ${\rm Y}(1s)$ suppression results in quite small $v_2$ for ${\rm Y}(1s)$. Our prediction for the integrated elliptic flow for ${\rm Y}(1s)$ in the $10-90$\% centrality class, which now includes an estimate of the systematic error, is $v_2[{\rm Y}(1s)]$ = 0.003 $\pm$ 0.0007 $\pm {}_{0.0013}^{0.0006}$. We also find that, due to their increased suppression, excited bottomonium states have a larger elliptic flow. Based on this observation we make predictions for $v_2[{\rm Y}(2s)]$ and $v_2[{\rm Y}(3s)]$ as a function of centrality and transverse momentum.

    hep-phnucl-thJHEP(2021)·45 citations
17. 17*

    Improving Helium Abundance Determinations with Leo P as a Case Study

    Erik Aver🇺🇸 · Danielle A. Berg🇺🇸 · Keith A. Olive🇺🇸 · Richard W. Pogge🇺🇸 · John J. Salzer🇺🇸 · Evan D. Skillman🇺🇸

    Currently, the primordial helium abundance is best estimated through spectroscopic observations of H II regions in metal-poor galaxies. However these determinations are limited by several systematic uncertainties which ultimately limit our ability to accurately ascertain the primordial abundance. In this study, we improve the methodologies for solving for the reddening, the emission contributions from collisional excitation of the H I atoms, the effects underlying absorption in the H I and He I emission lines, and the treatment of the blended H I and He I emission at $\lambda$3889 with the aim of lowering the systematic uncertainties in helium abundance determinations. To apply these methods, we have obtained observations of the He I $\lambda$10830 emission line in the brightest H II region in the extremely metal-poor (3$\%$ Z${}_{\odot }$) galaxy Leo P with the LUCI1 instrument on the LBT. We combine this measurement with previous MODS/LBT observations to derive an improved helium abundance. In doing so, our present analysis results in a decrease in the uncertainty in the helium abundance of Leo P by approximately 70%. This result is combined with data from other observations to estimate the primordial helium mass fraction, Y${}_p$ $=$ 0.2453 $\pm$ 0.0034.

    ↳ astro-ph.COastro-ph.GAhep-phJCAP(2021)·96 citations
18. 18*

    The Effects of Asymmetric Dark Matter on Stellar Evolution I: Spin-Dependent Scattering

    Troy J. Raen🇺🇸 · Héctor Martínez-Rodríguez🇺🇸 · Travis J. Hurst🇺🇸 · Andrew R. Zentner🇺🇸 · Carles Badenes🇺🇸 · Rachel Tao

    Most of the dark matter (DM) search over the last few decades has focused on WIMPs, but the viable parameter space is quickly shrinking. Asymmetric Dark Matter (ADM) is a WIMP-like DM candidate with slightly smaller masses and no present day annihilation, meaning that stars can capture and build up large quantities. The captured ADM can transport energy through a significant volume of the star. We investigate the effects of spin-dependent ADM energy transport on stellar structure and evolution in stars with $0.9\le M_{\star }/{\mathrm{M}}_{\odot }\le 5.0$ in varying DM environments. We wrote a MESA module that calculates the capture of DM and the subsequent energy transport within the star. We fix the DM mass to 5 GeV and the cross section to $10^{-37}\mathrm{cm}{}^2$, and study varying environments by scaling the DM capture rate. For stars with radiative cores ($M_{\star }\lesssim 1.3{\mathrm{M}}_{\odot }$), the presence of ADM flattens the temperature and burning profiles in the core and increases MS ($X_c>10^{-3}$) lifetimes by up to $\sim 20\%$. We find that strict requirements on energy conservation are crucial to the simulation of ADM's effects on these stars. In higher-mass stars, ADM energy transport shuts off core convection, limiting available fuel and shortening MS lifetimes by up to $\sim 40\%$. This may translate to changes in the luminosity and effective temperature of the MS turnoff in population isochrones. The tip of the red giant branch may occur at lower luminosities. The effects are largest in DM environments with high densities and/or low velocity dispersions, making dwarf and early forming galaxies most likely to display the effects.

    ↳ astro-ph.GAastro-ph.COastro-ph.SRhep-phMNRAS(2021)·19 citations
19. 19*

    A gauge invariant order parameter for monopole condensation in $QCD$ vacuum

    Adriano Di Giacomo🇮🇹

    In this paper we improve the existing order parameter for monopole condensation in gauge theory vacuum, making it gauge-invariant from scratch and free of the spurious infrared problems which plagued the old one. Computing the new parameter on the lattice will unambiguously detect weather dual superconductivity is the mechanism for color confinement. As a byproduct we relate confinement to the existence of a finite correlation length in the gauge-invariant correlator of chromo-electric field strengths.

    ↳ hep-lathep-phhep-thJHEP(2021)·8 citations
20. 20*

    Negative Mode Problem of False Vacuum Decay Revisited

    Ryusuke Jinno🇩🇪 · Ryosuke Sato🇩🇪

    We study negative modes around the Coleman-de Luccia bounce solution. The conditions for the appearance of an infinite number of the negative modes do not coincide between Lagrangian and Hamiltonian formulations in the literature, and we discuss the origin of this difference in detail. We show how different choices of the variable for the fluctuation around the bounce solution affect the negative mode condition in the Hamiltonian approach, and point out that there exists a choice which gives the same negative mode condition as the Lagrangian approach.

    ↳ hep-thgr-qchep-phPRD(2021)·11 citations
21. 21*

    Chiral transition in the probe approximation from an Einstein-Maxwell-dilaton gravity model

    Hardik Bohra🇮🇳 · David Dudal🇧🇪 · Ali Hajilou🇮🇷 · Subhash Mahapatra🇮🇳

    We refine an earlier introduced 5-dimensional gravity solution capable of holographically capturing several qualitative aspects of (lattice) QCD in a strong magnetic background such as the anisotropic behaviour of the string tension, inverse catalysis at the level of the deconfinement transition or sensitivity of the entanglement entropy to the latter. Here, we consistently modify our solution of the considered Einstein-Maxwell-dilaton system to not only overcome an unphysical flattening at large distances in the quark-antiquark potential plaguing earlier work, but also to encapsulate inverse catalysis for the chiral transition in the probe approximation. This brings our dynamical holographic QCD model yet again closer to a stage at which it can be used to predict magnetic QCD quantities not directly computable via lattice techniques.

    ↳ hep-thhep-lathep-phPRD(2021)·62 citations
22. 22*

    Irreducible cosmic production of relic vortons

    Pierre Auclair🇫🇷 · Patrick Peter🇫🇷 · Christophe Ringeval🇧🇪 · Daniele Steer🇫🇷

    The existence of a scaling network of current-carrying cosmic strings in our Universe is expected to continuously create loops endowed with a conserved current during the cosmological expansion. These loops radiate gravitational waves and may stabilise into centrifugally supported configurations. We show that this process generates an irreducible population of vortons which has not been considered so far. In particular, we expect vortons to be massively present today even if no loops are created at the time of string formation. We determine their cosmological distribution, and estimate their relic abundance today as a function of both the string tension and the current energy scale. This allows us to rule out new domains of this parameter space. At the same time, given some conditions on the string current, vortons are shown to provide a viable and original dark matter candidate, possibly for all values of the string tension. Their mass, spin and charge spectrum being broad, vortons would have an unusual phenomenology in dark matter searches.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2021)·20 citations
23. 23*

    Stellar Collapse Diversity and the Diffuse Supernova Neutrino Background

    Daniel Kresse (1,2)🇩🇪 · Thomas Ertl (1)🇩🇪 · Hans-Thomas Janka (1) ((1) MPI for Astrophysics, Garching, (2) Technische Universitaet Muenchen)🇩🇪

    The diffuse cosmic supernova neutrino background (DSNB) is observational target of the gadolinium-loaded Super-Kamiokande (SK) detector and the forthcoming JUNO and Hyper-Kamiokande detectors. Current predictions are hampered by our still incomplete understanding of the supernova (SN) explosion mechanism and of the neutron star (NS) equation of state and maximum mass. In our comprehensive study we revisit this problem on grounds of the landscapes of successful and failed SN explosions obtained by Sukhbold et al. and Ertl et al. with parametrized one-dimensional neutrino engines for large sets of single-star and helium-star progenitors, with the latter serving as proxy of binary evolution effects. Besides considering engines of different strengths, leading to different fractions of failed SNe with black-hole (BH) formation, we also vary the NS mass limit, the spectral shape of the neutrino emission, and include contributions from poorly understood alternative NS-formation channels such as accretion-induced or merger-induced collapse events. Since the neutrino signals of our large model sets are approximate, we calibrate the associated degrees of freedom by using state-of-the-art simulations of proto-neutron star cooling. Our predictions are higher than other recent ones because of a large fraction of failed SNe with long delay to BH formation. Our best-guess model predicts a DSNB electron-antineutrino-flux of 28.8^{+24.6}_{-10.9} cm^{-2}s^{-1} with 6.0^{+5.1}_{-2.1} cm^{-2}s^{-1} in the favorable measurement interval of [10,30] MeV, and 1.3^{+1.1}_{-0.4} cm^{-2}s^{-1} with electron-antineutrino energies > 17.3 MeV, which is roughly a factor of two below the current SK limit. The uncertainty range is dominated by the still insufficiently constrained cosmic rate of stellar core-collapse events.

    ↳ astro-ph.HEhep-phApJ(2021)·110 citations
24. 24*

    Emergent gravity from hidden sectors and TT deformations

    Panos Betzios🇫🇷 · Elias Kiritsis🇬🇷 · Vasilis Niarchos🇬🇷

    We investigate emergent gravity extending the paradigm of the AdS/CFT correspondence. The emergent graviton is associated to the (dynamical) expectation value of the energy-momentum tensor. We derive the general effective description of such dynamics, and apply it to the case where a hidden theory generates gravity that is coupled to the Standard Model. In the linearized description, generically, such gravity is massive with the presence of an extra scalar degree of freedom. The propagators of both the spin-two and spin-zero modes are positive and well defined. The associated emergent gravitational theory is a bi-gravity theory, as is (secretly) the case in holography. The background metric on which the QFTs are defined, plays the role of dark energy and the emergent theory has always as a solution the original background metric. In the case where the hidden theory is holographic, the overall description yields a higher-dimensional bulk theory coupled to a brane. The effective graviton on the brane has four-dimensional characteristics both in the UV and IR and is always massive.

    ↳ hep-thgr-qchep-phJHEP(2021)·18 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.