Wed·Aug 30, 2017Wednesday·August 30, 2017

1. 01*

   Detecting Hidden Particles with MATHUSLA

   Jared A. Evans🇺🇸

   A hidden sector containing light long-lived particles provides a well-motivated place to find new physics. The recently proposed MATHUSLA experiment has the potential to be extremely sensitive to light particles originating from rare meson decays in the very long lifetime region. In this work, we illustrate this strength with the specific example of a light scalar mixed with the standard model-like Higgs boson, a model where MATHUSLA can further probe unexplored parameter space from exotic Higgs decays. Design augmentations should be considered in order to maximize the ability of MATHUSLA to discover very light hidden sector particles.

   hep-phPRD(2018)·76 citations
2. 02*

   Anarchy with linear and bilinear interactions

   Leandro Da Rold🇦🇷

   Composite Higgs models with anarchic partial compositeness require a scale of new physics $\mathcal{O}(10-100)$ TeV, with the bounds being dominated by the dipole moments and ${ϵ}_K$. The presence of anarchic bilinear interactions can change this picture. We show a solution to the SM flavor puzzle where the electron and the Right-handed quarks of the first generation have negligible linear interactions, and the bilinear interactions account for most of their masses, whereas the other chiral fermions follow a similar pattern to anarchic partial compositeness. We compute the bounds from flavor and CP violation and show that neutron and electron dipole moments, as well as ${ϵ}_K$ and $\mu \to e\gamma$, are compatible with a new physics scale below the TeV. $\Delta F=2$ operators involving Left-handed quarks and $\Delta F=1$ operators with $d_L$ give the most stringent bounds in this scenario. Their Wilson coefficients have the same origin as in anarchic partial compositeness, requiring the masses of the new states to be larger than $\mathcal{O}(6-7)$ TeV.

   hep-phJHEP(2017)·11 citations
3. 03*

   Electrodynamics of dual superconducting chiral medium

   Yang Li🇺🇸 · Kirill Tuchin🇺🇸

   We study the electrodynamics of a chiral medium with electric and magnetic charges using the effective Maxwell-Chern-Simons theory extended to include the magnetic current. The exchange of helicity between the chiral medium and the magnetic field, known as the inverse cascade, is controlled by the chiral anomaly equation. In the presence of the magnetic current, the magnetic helicity is dissipated, so that the inverse cascade stops when the magnetic helicity vanishes while the chiral conductivity reaches a non-vanishing stationary value satisfying ${\sigma }_{\chi }^2<4{\sigma }_e{\sigma }_m$, where ${\sigma }_e$, ${\sigma }_m$ and ${\sigma }_{\chi }$ are the electric, magnetic and chiral conductivities respectively. We argue that this state is superconducting and exhibits the Meissner effect for both electric and magnetic fields. Moreover, this state is stable with respect to small magnetic helicity fluctuations; the magnetic helicity becomes unstable only when the inequality mentioned above is violated.

   hep-phcond-mat.supr-connucl-thPLB(2018)·8 citations
4. 04*

   Coherent and incoherent Upsilon production in ultraperipheral collisions at the Large Hadron Collider

   M.B. Gay Ducati🇧🇷 · F. Kopp🇧🇷 · M.V.T. Machado🇧🇷

   The exclusive photoproduction of ${\rm Y}(nS)$ states were calculated in ultra-peripheral collisions for coherent and incoherent process in PbPb at $\sqrt{s_{NN}}$= 5.5 TeV. Different dipole models were compared in the theoretical framework of light-cone color dipole formalism. Moreover, it was calculated the differential cross section for the Upsilon states and their total cross section for two intervals of rapidity: $|y|\le 4$ 4 and $2\le$ y $\le 4.5$. A systematic study is done on the theoretical uncertainties associated to the production and predictions are presented for the first time for the incoherent cross section of the radially excited states.

   hep-phPRD(2017)·8 citations
5. 05*

   Confronting Dirac Fermionic Dark Matter with Recent Data

   Chun-Khiang Chua🇹🇼 · Gwo-Guang Wong🇹🇼

   We study Dirac fermionic dark matter (DM, ${\chi }^0$) and confront it with recent data. To evade the stringent direct search limits from PandaX-II, XENON1T and LUX experiments, the quantum numbers of the Dirac DM are taken to be $I_3=Y=0$ to remove the tree-level $Z$-exchange diagram. Loop amplitudes can contribute to the elastic scattering cross section. We find that there are cancellations in the one-loop diagrams, which largely reduce the cross section and make the Dirac DM viable in the direct search. For a generic isospin $I$, we survey the Dirac DM mass constrained by the latest results of PandaX-II, XENON1T and LUX experiments, the observed DM relic density, and the H.E.S.S. and the Fermi-LAT astrophysical observations. Sommerfeld enhancement effects on DM annihilation processes are investigated. We find that the cross section of ${\chi }^0{\bar{\chi }}^0$ annihilating to the standard model (SM) gauge bosons are in general significantly enhanced, and the Fermi-LAT, the H.E.S.S. upper limits on $⟨\sigma v⟩(W^{+}{W}^{-},\gamma \gamma )$ and the observed relic density become serious constraints on the Dirac DM mass. The $I<4$ cases are ruled out and for $I\ge 4$, the lower bound on Dirac DM mass are forced to be $\gtrsim$ 60 TeV. The elastic scattering cross section for $m_{\chi }$ of few tens TeV with a generic $I$ is found to be ${\sigma }^{SI}\simeq I^2(I+1{)}^2\times 7\times 10^{-49}$~cm${}^2$. The predicted $⟨\sigma ({\chi }^0{\bar{\chi }}^0\to Z^0{Z}^0,Z^0\gamma ,\gamma \gamma )v⟩$ and ${\sigma }^{SI}$ are sizable and they will be useful to search for DM in astrophysical observation and in direct search in near future.

   hep-phhep-exPRD(2017)·3 citations
6. 06*

   Linearly polarized gluons and axial charge fluctuations in the Glasma

   T. Lappi🇫🇮 · S. Schlichting🇺🇸

   We calculate of the one- and two-point correlation functions of the energy density and the divergence of the Chern-Simons current in the nonequilibrium Glasma state formed in a high-energy nuclear collision. We show that the latter depends on the difference of the total and linearly polarized gluon transverse momentum distributions. Since the divergence of the Chern-Simons current provides the source of axial charge, we infer information about the statistical properties of axial charge production at early times. We further develop a simple phenomenological model to characterize axial charge distributions in terms of distributions of the energy density.

   hep-phnucl-thPRD(2018)·68 citations
7. 07*

   Note on relation between bottom-up holographic models and large-Nc QCD

   S.S. Afonin🇷🇺

   We discuss a derivation of the quadratic in fields part of action of bottom-up holographic models from some general properties of the large-Nc limit in QCD.

   hep-phhep-thAdv.High Energy Phys.(2017)·8 citations
8. 08*

   Neutrinophilic two Higgs doublet model with dark matter under an alternative $U(1{)}_{B-L}$ gauge symmetry

   Takaaki Nomura🇰🇷 · Hiroshi Okada🇹🇼

   We propose Dirac type active neutrino with rank two mass matrix and a Majorana fermion dark matter candidate with an alternative local $U(1{)}_{B-L}$ extension of neutrinophilic two Higgs doublet model. Our dark matter candidate can be stabilized due to charge assignment under the gauge symmetry without imposing extra discrete $Z_2$ symmetry and the relic density is obtained from $Z^{\prime }$ boson exchanging process. Taking into account collider constraints on $Z^{\prime }$ boson mass and coupling, we estimate the relic density.

   hep-phEPJC(2018)·33 citations
9. 09*

   Scalar decays to $\gamma \gamma$, $Z\gamma$, and $W\gamma$ in the Georgi-Machacek model

   Celine Degrande (1)🇨🇭 · Katy Hartling🇨🇦 · Heather E. Logan (2) ((1) CERN, (2) Carleton U.)🇨🇦

   We compute the decay widths for the neutral and singly-charged Higgs bosons in the Georgi-Machacek model into the final states $\gamma \gamma$, $Z\gamma$, and $W\gamma$. These decays are most phenomenologically interesting for the fermiophobic custodial fiveplet states $H_5^0$ and $H_5^{\pm }$ when their masses are below threshold for decays into $WW$, $ZZ$, or $WZ$. We study the allowed branching ratios into these final states using scans over the allowed parameter space, and show how the model can be constrained by LEP searches for a fermiophobic Higgs boson decaying to two photons. The calculation involves evaluating one-loop diagrams in which the loop contains particles with two different masses, some of which do not appear in the existing literature. We give results for these diagrams in a form convenient for numerical implementation using the LoopTools package.

   hep-phPRD(2017)·45 citations
10. 10*

    Extraction of nucleon axial charge and radius from lattice QCD results using baryon chiral perturbation theory

    De-Liang Yao🇪🇸 · Luis Alvarez-Ruso🇪🇸 · Manuel J. Vicente-Vacas🇪🇸

    We calculate the nucleon axial form factor up to the leading one-loop order in a covariant chiral effective field theory with the $\Delta (1232)$ resonance as an explicit degree of freedom. We fit the axial form factor to the latest lattice QCD data and pin down the relevant low-energy constants. The lattice QCD data, for various pion masses below $400$ MeV, can be well described up to a momentum transfer of $\sim 0.6$ GeV. The $\Delta (1232)$ loops contribute significantly to this agreement. Furthermore, we extract the axial charge and radius based on the fitted values of the low energy constants. The results are: $g_A=1.237(74)$ and $⟨r_A^2⟩=0.263(38){\mathrm{fm}}^2$. The obtained coupling $g_A$ is consistent with the experimental value if the uncertainty is taken into account. The axial radius is below but in agreement with the recent extraction from neutrino quasi-elastic scattering data on deuterium, which has large error bars. Up to our current working accuracy, $r_A$ is predicted only at leading order, i.e., one-loop level. A more precise determination might need terms of $\mathcal{O}(p^5)$.

    hep-phhep-latPRD(2017)·55 citations
11. 11*

    Explanation of the Beryllium Anomaly in a $U(1{)}^{\prime }$-Extended 2-Higgs Doublet Model

    Luigi Delle Rose🇬🇧 · Shaaban Khalil🇪🇬 · Stefano Moretti🇬🇧

    We consider an extension of the Standard Model with an extra gauged $U(1{)}^{\prime }$ symmetry in presence of a 2-Higgs Doublet Model structure of the scalar sector. We show that this scenario is able to explain the anomaly observed by the Atomki collaboration in the decay of an excited state of Beryllium via a light spin-1 $Z^{\prime }$ with a mass of 17 MeV.

    hep-phPoS(2018)·2 citations
12. 12*

    Heavy and heavy-light mesons and the Lorentz structure of the quark-antiquark interaction

    Sofia Leitão🇵🇹 · Alfred Stadler🇵🇹 · M. T. Peña🇵🇹 · Elmar P. Biernat🇵🇹

    We solve a Minkowski-space integral equation, derived in the Covariant Spectator Theory, for quark-antiquark bound states describing heavy and heavy-light mesons. The equation's kernel contains a one-gluon exchange interaction and a covariant generalization of a linear confining potential with a mixed scalar, pseudoscalar, and vector Lorentz structure, characterized by a continuous mixing parameter. We investigate to what extent the Lorentz structure of the confining kernel can be determined by fitting the mixing parameter to the meson spectrum.

    hep-phnucl-thActa Phys.Polon.Supp.(2017)·0 citations
13. 13*

    Improved Formalism for Precision Higgs Coupling Fits

    Tim Barklow🇺🇸 · Keisuke Fujii🇯🇵 · Sunghoon Jung🇰🇷 · Robert Karl🇩🇪 · Jenny List🇩🇪 · Tomohisa Ogawa🇯🇵 · Michael E. Peskin🇺🇸 · Junping Tian🇯🇵

    Future e+e- colliders give the promise of model-independent determinations of the couplings of the Higgs boson. In this paper, we present an improved formalism for extracting Higgs boson couplings from e+e- data, based on the Effective Field Theory description of corrections to the Standard Model. We apply this formalism to give projections of Higgs coupling accuracies for stages of the International Linear Collider and for other proposed e+e- colliders.

    hep-phhep-exPRD(2018)·169 citations
14. 14*

    Detection of sub-MeV Dark Matter with Three-Dimensional Dirac Materials

    Yonit Hochberg🇺🇸 · Yonatan Kahn🇺🇸 · Mariangela Lisanti🇺🇸 · Kathryn M. Zurek🇺🇸 · Adolfo G. Grushin🇺🇸 · Roni Ilan🇮🇱 · Sinead M. Griffin🇺🇸 · Zhen-Fei Liu🇺🇸 · Sophie F. Weber🇺🇸 · Jeffrey B. Neaton🇺🇸

    We propose the use of three-dimensional Dirac materials as targets for direct detection of sub-MeV dark matter. Dirac materials are characterized by a linear dispersion for low-energy electronic excitations, with a small band gap of O(meV) if lattice symmetries are broken. Dark matter at the keV scale carrying kinetic energy as small as a few meV can scatter and excite an electron across the gap. Alternatively, bosonic dark matter as light as a few meV can be absorbed by the electrons in the target. We develop the formalism for dark matter scattering and absorption in Dirac materials and calculate the experimental reach of these target materials. We find that Dirac materials can play a crucial role in detecting dark matter in the keV to MeV mass range that scatters with electrons via a kinetically mixed dark photon, as the dark photon does not develop an in-medium effective mass. The same target materials provide excellent sensitivity to absorption of light bosonic dark matter in the meV to hundreds of meV mass range, superior to all other existing proposals when the dark matter is a kinetically mixed dark photon.

    hep-phcond-mat.mtrl-scicond-mat.str-elPRD(2018)·245 citations
15. 15*

    $\mathcal{R}(D^{(\ast )})$ anomalies in light of Non-Minimal Universal Extra Dimension

    Aritra Biswas🇮🇳 · Sunando Kumar Patra🇮🇳 · Avirup Shaw🇮🇳

    We estimate contributions from Kaluza-Klein excitations of gauge bosons and physical charge scalar for the explanation of the lepton flavor universality violating excess in the ratios $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ in 5 dimensional Universal Extra Dimensional scenario with non-vanishing boundary localized terms. This model is conventionally known as non-minimal Universal Extra Dimensional model. We obtain the allowed parameter space in accordance with constraints coming from $B_c\to \tau \nu$ decay, as well as those from the electroweak precision tests.

    hep-phhep-exPRD(2018)·17 citations
16. 16*

    Modified Weibull and Tsallis Distributions for multiplicities in $e^{+}{e}^{-}$ collisions at LEP2 energies

    S. Sharma🇮🇳 · M. Kaur🇮🇳 · S. Thakur🇮🇳

    Multiplicity distributions of charged particles produced in the $e^{+}{e}^{-}$ collisions at LEP2 energies ranging from 91 to 206 GeV in full phase space, are compared with predictions from Tsallis $q$-statistics and the recently proposed Weibull distribution functions.~The analysis uses data from two LEP experiments, L3 and OPAL.~It is shown that Tsallis $q$-statistics explains the data in a statistically acceptable manner in full phase space at all energies, while the Weibull distribution fails to explain the underlying properties of the data.~Modifications to the distributions proposed earlier, are applied to uncover manifold improvements in explaining the data characteristics.

    hep-ph0 citations
17. 17*

    Electromagnetic dipole moments of charged baryons with bent crystals at the LHC

    E. Bagli🇮🇹 · L. Bandiera🇮🇹 · G. Cavoto🇮🇹 · V. Guidi🇮🇹 · L. Henry🇪🇸 · D. Marangotto🇮🇹 · F. Martinez Vidal🇪🇸 · A. Mazzolari🇮🇹 · A. Merli🇮🇹 · N. Neri🇮🇹 · J. Ruiz Vidal🇪🇸

    We propose a unique program of measurements of electric and magnetic dipole moments of charm, beauty and strange charged baryons at the LHC, based on the phenomenon of spin precession of channeled particles in bent crystals. Studies of crystal channeling and spin precession of positively- and negatively-charged particles are presented, along with feasibility studies and expected sensitivities for the proposed experiment using a layout based on the LHCb detector.

    ↳ hep-exhep-phphysics.ins-detEPJC(2017)·78 citations
18. 18*

    Induced Ellipticity for Inspiraling Binary Systems

    Lisa Randall🇺🇸 · Zhong-Zhi Xianyu🇺🇸

    Although gravitational waves tend to erase eccentricity of an inspiraling binary system, ellipticity can be generated in the presence of surrounding matter. We present a semi-analytical method for understanding the eccentricity distribution of binary black holes in the presence of a supermassive black hole in a galactic center. Given a matter distribution, we show how to determine the resultant eccentricity analytically in the presence of both tidal forces and evaporation up to one cutoff and one matter-distribution-independent function, paving the way for understanding the environment of detected inspiraling black holes. We furthermore generalize Kozai-Lidov dynamics to situations where perturbation theory breaks down for short time intervals, allowing more general angular momentum exchange, such that eccentricity is generated even when all bodies orbit in the same plane.

    ↳ gr-qcastro-ph.HEhep-phhep-thApJ(2018)·76 citations
19. 19*

    Isothermal compressibility of hadronic matter formed in relativistic nuclear collisions

    Maitreyee Mukherjee🇮🇳 · Sumit Basu🇺🇸 · Arghya Chatterjee🇮🇳 · Sandeep Chatterjee🇵🇱 · Souvik Priyam Adhya🇮🇳 · Sanchari Thakur🇮🇳 · Tapan K. Nayak🇮🇳

    We present the first estimates of isothermal compressibility (\kT) of hadronic matter formed in relativistic nuclear collisions ($\sqrt{s_{\mathrm{NN}}}=7.7$ GeV to 2.76~TeV) using experimentally observed quantities. \kT~is related to the fluctuation in particle multiplicity, temperature, and volume of the system formed in the collisions. Multiplicity fluctuations are obtained from the event-by-event distributions of charged particle multiplicities in narrow centrality bins. The dynamical components of the fluctuations are extracted by removing the contributions to the fluctuations from the number of participating nucleons. From the available experimental data, a constant value of \kT~has been observed as a function of collision energy. The results are compared with calculations from UrQMD, AMPT, and EPOS event generators, and estimations of \kT~are made for Pb-Pb collisions at the CERN Large Hadron Collider. A hadron resonance gas (HRG) model has been used to calculate \kT~as a function of collision energy. Our results show a decrease in \kT~at low collision energies to \sNN~$\sim$~20~GeV, beyond which the \kT~values remain almost constant.

    ↳ nucl-exhep-exhep-phnucl-thPLB(2018)·23 citations
20. 20*

    Cosmic History of Chameleonic Dark Matter in $F(R)$ Gravity

    Taishi Katsuragawa🇯🇵 · Shinya Matsuzaki🇯🇵

    We study the cosmic history of the scalaron in $F(R)$ gravity with constructing the time evolution of the cosmic environment and discuss the chameleonic dark matter based on the chameleon mechanism in the early and current Universe. We then find that the scalaron can be a dark matter. We also propose an interesting possibility that the $F(R)$ gravity can address the coincidence problem.

    ↳ gr-qcastro-ph.COhep-phPRD(2018)·48 citations
21. 21*

    Physics case of the very high energy electron--proton collider, VHEeP

    A. Caldwell🇩🇪 · F. Keeble🇬🇧 · E. Simpson Dore🇬🇧 · M.Wing🇬🇧

    The possibility of a very high energy electron-proton (VHEeP) collider with a centre-of-mass energy of 9 TeV has been presented at previous workshops. These proceedings briefly summarise the VHEeP concept, which was recently published, and developments since then, as well as future directions. At the VHEeP collider, with a centre-of-mass energy 30 times greater than HERA, parton momentum fractions, $x$, down to about $10^{-8}$ are accessible for photon virtualities, $Q^2$, of 1 GeV${}^2$. This extension in the kinematic range to low $x$ complements proposals for other electron-proton or electron-ion colliders.

    ↳ hep-exhep-phphysics.acc-phphysics.plasm-phPoS(2018)·1 citation
22. 22*

    Averaged Energy Conditions and Bouncing Universes

    Massimo Giovannini🇨🇭

    The dynamics of bouncing universes is characterized by violating certain coordinate invariant restrictions on the total energy-momentum tensor, customarily referred to as energy conditions. Although there could be epochs where the null energy condition is locally violated, it may perhaps be enforced in an averaged sense. Explicit examples of this possibility are investigated in different frameworks.

    ↳ hep-thastro-ph.COgr-qchep-phPRD(2017)·14 citations
23. 23*

    Casimir Force for the $\mathbb{C}{P}^{N-1}$ Model

    Antonino Flachi🇯🇵 · Muneto Nitta🇯🇵 · Satoshi Takada🇯🇵 · Ryosuke Yoshii🇯🇵

    In this work, we derive exact self-consistent solutions to the gap equations of the $\mathbb{C}{P}^{N-1}$ model on a finite interval with Dirichlet boundary conditions in the large-$N$ approximation. The solution reproduce the confining phase in the infinite system by taking the appropriate limit. We compute the vacuum energy and the Casimir force and observe that the sign of the force is always attractive.

    ↳ hep-thcond-mat.supr-conhep-phPLB(2019)·26 citations
24. 24*

    Results from the Super Cryogenic Dark Matter Search (SuperCDMS) experiment at Soudan

    SuperCDMS Collaboration: R. Agnese🇺🇸 · T. Aramaki🇺🇸 · I.J. Arnquist🇺🇸 · W. Baker🇺🇸 · D. Balakishiyeva🇺🇸 · S. Banik🇮🇳 · D. Barker🇺🇸 · R. Basu Thakur🇺🇸 · D.A. Bauer🇺🇸 · T. Binder🇺🇸 · M.A. Bowles🇺🇸 · P.L. Brink🇺🇸 and 91 other authors

    We report the result of a blinded search for Weakly Interacting Massive Particles (WIMPs) using the majority of the SuperCDMS Soudan dataset. With an exposure of 1690 kg days, a single candidate event is observed, consistent with expected backgrounds. This analysis (combined with previous Ge results) sets an upper limit on the spin-independent WIMP--nucleon cross section of $1.4\times 10^{-44}$ ($1.0\times 10^{-44}$) cm${}^2$ at 46 GeV/$c^2$. These results set the strongest limits for WIMP--germanium-nucleus interactions for masses $>$12 GeV/$c^2$.

    ↳ hep-exhep-phPRL(2018)·255 citations
25. 25*

    A Convolutional Neural Network For Cosmic String Detection in CMB Temperature Maps

    Razvan Ciuca🇨🇦 · Oscar F. Hernández🇨🇦 · Michael Wolman🇨🇦

    We present in detail the convolutional neural network used in our previous work to detect cosmic strings in cosmic microwave background (CMB) temperature anisotropy maps. By training this neural network on numerically generated CMB temperature maps, with and without cosmic strings, the network can produce prediction maps that locate the position of the cosmic strings and provide a probabilistic estimate of the value of the string tension $G\mu$. Supplying noiseless simulations of CMB maps with arcmin resolution to the network resulted in the accurate determination both of string locations and string tension for sky maps having strings with string tension as low as $G\mu =5\times 10^{-9}$. The code is publicly available online. Though we trained the network with a long straight string toy model, we show the network performs well with realistic Nambu-Goto simulations.

    ↳ astro-ph.COgr-qchep-phhep-thMNRAS(2019)·31 citations
26. 26*

    Astrophysical Haloscopes

    Guenter Sigl🇩🇪

    We compute the fluxes of radio photons from conversion of axion-like particle dark matter in cosmic magnetic fields. We find that for axion-like particle masses around $10^{-6}$eV and effective coupling constants to photons $g_{a\gamma }\gtrsim 10^{-13}{\mathrm{GeV}}^{-1}$ strongly magnetized nearby stellar winds may give detectable line-like radio photon signals, although predicted fluxes are highly uncertain due to the poorly known structure of the magnetic fields. Nevertheless, it may be worth while to conduct a dedicated search in the direction of such sources. When combined with a possible future laboratory detection of axion-like dark matter such observations may in turn provide information on the small scale magnetic field structure in such objects.

    ↳ astro-ph.HEhep-phPRD(2017)·40 citations
27. 27*

    Phase-space analysis of the Schwinger effect in inhomogeneous electromagnetic fields

    Christian Kohlfürst🇩🇪

    Schwinger pair production in spatially and temporally inhomogeneous electric and magnetic fields is studied. The focus is on the particle phase-space distribution within a high-intensity few-cycle pulse. Accurate numerical solutions of a quantum kinetic theory (DHW formalism) are presented in momentum space and, with the aid of coarse-graining techniques, in a mixed spatial-momentum representation. Additionally, signatures of the carrier-envelope phase as well as spin-field interactions are discussed on the basis of a trajectory-based model taking into account instantaneous pair production and relativistic single-particle dynamics. Although our simple semi-classical single-particle model cannot describe every aspect of the particle production process (quantum interferences), essential features such as spin-field interactions are captured.

    ↳ quant-phhep-phEur.Phys.J.Plus(2018)·41 citations
28. 28*

    Oscillons from String Moduli

    Stefan Antusch🇨🇭 · Francesco Cefala🇨🇭 · Sven Krippendorf🇬🇧 · Francesco Muia🇬🇧 · Stefano Orani🇨🇭 · Fernando Quevedo🇮🇹

    A generic feature of string compactifications is the presence of many scalar fields, called moduli. Moduli are usually displaced from their post-inflationary minimum during inflation. Their relaxation to the minimum could lead to the production of oscillons: localised, long-lived, non-linear excitations of the scalar fields. Here we discuss under which conditions oscillons can be produced in string cosmology and illustrate their production and potential phenomenology with two explicit examples: the case of an initially displaced volume modulus in the KKLT scenario and the case of a displaced blow-up Kaehler modulus in the Large Volume Scenario (LVS). One, in principle, observable consequence of oscillon dynamics is the production of gravitational waves which, contrary to those produced from preheating after high scale inflation, could have lower frequencies, closer to the currently observable range. We also show that, for the considered parameter ranges, oscillating fibre and volume moduli do not develop any significant non-perturbative dynamics. Furthermore, we find that the vacua in the LVS and the KKLT scenario are stable against local overshootings of the field into the decompatification region, which provides an additional check on the longevity of these metastable configurations.

    ↳ hep-thastro-ph.COhep-phJHEP(2018)·102 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.