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  • ℋolographic 𝒩aturalness
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-11
    Andrea Addazi

    The ℋolographic 𝒩aturalness (ℋ𝒩) is a new paradigm towards an explanation of the Cosmological Constant (CC) and the Higgs Hierarchy (HH) in the Universe. Motivated by the Holographic Principle, and inspired by the (A)dS/CFT correspondence, we elaborate on the possibility and on the cosmological consequences of a fundamental intrinsic disorder and temperature in vacuo. We postulate that the zero vacuum

    更新日期:2020-09-18
  • Lorentzian quintessential inflation
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-12
    David Benisty; Eduardo I. Guendelman

    From the assumption that the slow-roll parameter 𝜖 has a Lorentzian form as a function of the e-folds number N, a successful model of a quintessential inflation is obtained. The form corresponds to the vacuum energy both in the inflationary and in the dark energy epochs. The form satisfies the condition to climb from small values of 𝜖 to 1 at the end of the inflationary epoch. At the late universe

    更新日期:2020-09-18
  • Helical phase inflation and its observational constraints
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-16
    Mudassar Sabir, Waqas Ahmed, Yungui Gong, Tianjun Li and Jiong Lin

    We consider a class of helical phase inflation models from the N =1 supergravity where the phase component of a complex field acts as an inflaton. This class of models avoids the eta problem in supergravity inflation due to the phase monodromy of the superpotential. We study the inflationary predictions of this class of models in the context of both standard and large extra dimensional brane cosmology

    更新日期:2020-09-18
  • Can a conditioning on stellar mass explain the mutual information between morphology and environment?
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-16
    Snehasish Bhattacharjee, Biswajit Pandey and Suman Sarkar

    Recent studies with SDSS have shown that a statistically significant non-zero mutual information between morphology and environment persists up to several tens of Mpc, which awaits an explanation. Galaxies in different environments acquire their stellar mass through accretion and merger and the stellar mass function of galaxies is known to depend on both environment and morphology. Naturally, stellar

    更新日期:2020-09-18
  • Search for ultralight scalar dark matter with NANOGrav pulsar timing arrays
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-16
    Ryo Kato and Jiro Soda

    An ultralight scalar field is a candidate for the dark matter. The ultralight scalar dark matter with mass around 10 −23 eV induces oscillations of the pulse arrival time in the sensitive frequency range of the pulsar timing arrays. We search for the ultralight scalar dark matter using the North American Nanohertz Observatory for Gravitational Waves 11-year Data Set. We give the 95% confidence upper

    更新日期:2020-09-18
  • Gravitational waves induced by scalar perturbations with a lognormal peak
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-16
    Shi Pi and Misao Sasaki

    We study the stochastic gravitational wave (GW) background induced by the primordial scalar perturbation with the spectrum having a lognormal peak of width Δ at k = k * . We derive an analytical formula for the GW spectrum Ω GW for both narrow (Δ ##IMG## [https://ej.iop.org/icons/Entities/ll.gif] {ll} 1) and broad (Δ ##IMG## [https://ej.iop.org/icons/Entities/gtrsim.gif] {gtrsim} 1) peaks. In the narrow-peak

    更新日期:2020-09-18
  • Cosmic rays and spectral distortions from collapsing textures
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-16
    Robert Brandenberger, Bryce Cyr and Hao Jiao

    We compute the energy spectrum of photons {and neutrinos} produced by the unwinding of a scaling distribution of cosmic textures, and discuss the implications for the spectrum of high energy cosmic rays, and for CMB spectral distortions. Textures lead to a contribution to the photon flux which scales as E 3 F ( E) ~ E 3/2 . Hence, the tightest constraints on the texture model come from the highest

    更新日期:2020-09-18
  • The vecro hypothesis
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-16
    Samir D. Mathur

    We consider three fundamental issues in quantum gravity: (a) the black hole information paradox (b) the unboundedness of entropy that can be stored inside a black hole horizon (c) the relation between the black hole horizon and the cosmological horizon. With help from the small corrections theorem, we convert each of these issues into a sharp conflict. We then argue that all three conflicts can be

    更新日期:2020-09-16
  • A theory of type-II minimally modified gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-15
    Antonio De Felice, Andreas Doll and Shinji Mukohyama

    We propose a modified gravity theory that propagates only two local gravitational degrees of freedom and that does not have an Einstein frame. According to the classification in [2], this is a type-II minimally modified gravity theory. The theory is characterized by the gravitational constant G N and a function V ( ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} ) of a non-dynamical auxiliary

    更新日期:2020-09-16
  • Finite temperature effects in modular cosmology
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-15
    Diego Gallego

    We revisit the cosmological history in the presence of light moduli by including possible thermal effects in the scalar potential. The well known cosmological moduli problem regards initial energy stored in the moduli due to a misalignment from its final position during inflation. We show that finite temperature corrections to the scalar potential, in general, induce similar effects and these are likely

    更新日期:2020-09-16
  • Gravitational lensing by black holes in the 4 D Einstein-Gauss-Bonnet gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-14
    Shafqat Ul Islam, Rahul Kumar and Sushant G. Ghosh

    Recently, a non-trivial 4 D Einstein-Gauss-Bonnet (EGB) theory of gravity, by rescaling the GB coupling parameter as α/( D −4), was formulated in [1], which bypasses Lovelock's theorem and avoids Ostrogradsky instability. The theory admits a static spherically symmetric black hole, unlike 5 D EGB or general relativity counterpart, which can have both Cauchy and event horizons. We generalize previous

    更新日期:2020-09-15
  • Improved treatment of dark matter capture in neutron stars
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-14
    Nicole F. Bell, Giorgio Busoni, Sandra Robles and Michael Virgato

    Neutron stars provide a cosmic laboratory to study the nature of dark matter particles and their interactions. Dark matter can be captured by neutron stars via scattering, where kinetic energy is transferred to the star. This can have a number of observational consequences, such as the heating of old neutron stars to infra-red temperatures. Previous treatments of the capture process have employed various

    更新日期:2020-09-15
  • Pulsar timing array constraints on spin-2 ULDM
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-14
    Juan Manuel Armaleo, Diana López Nacir and Federico R. Urban

    Ultra-light Dark Matter (ULDM) models are suitable candidates for the cosmological Dark Matter that may leave characteristic imprints in many observables. Among other probes, signatures of ULDM can be searched for in pulsar timing data. In this work we describe the effects of spin-2 ULDM on pulsar timing arrays, extending previous results on lower spins. Spin-2 ULDM is universally coupled to standard

    更新日期:2020-09-15
  • On the symmetries of cosmological perturbations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-14
    Daniel Green and Enrico Pajer

    The space of inflationary models is vast, containing wide varieties of mechanisms, symmetries, and spectra of particles. Consequently, the space of observational signatures is similarly complex. Hence, it is natural to look for boundaries of the space of models and their signatures. In this paper, we explore the possible symmetries associated with the primordial cosmological perturbations and their

    更新日期:2020-09-15
  • Interacting radiation after Planck and its implications for the Hubble tension
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-14
    Nikita Blinov and Gustavo Marques-Tavares

    Standard cosmology predicts that prior to matter-radiation equality about 41% of the energy density was in free-streaming neutrinos. In many beyond Standard Model scenarios, however, the amount and free-streaming nature of this component is modified. For example, this occurs in models with new neutrino self-interactions or an additional dark sector with interacting light particles. We consider several

    更新日期:2020-09-15
  • Holographic map for cosmological horizons
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-14
    Chang Liu; David A. Lowe

    We propose a holographic map between Einstein gravity coupled to matter in a de Sitter background and large N quantum mechanics of a system of spins. Holography maps a spin model with a finite-dimensional Hilbert space defined on a version of the stretched horizon into bulk gravitational dynamics. The full Hamiltonian of the spin model contains a nonlocal piece which generates chaotic dynamics, widely

    更新日期:2020-09-15
  • Physical parameter space of bimetric theory and SN1a constraints
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    Marvin Lüben, Angnis Schmidt-May and Jochen Weller

    Bimetric theory describes a massless and a massive spin-2 field with fully non-linear (self-)interactions. It has a rich phenomenology and has been successfully tested with several data sets. However, the observational constraints have not been combined in a consistent framework, yet. We propose a parametrization of bimetric solutions in terms of the effective cosmological constant Λ and the mass m

    更新日期:2020-09-14
  • Search for the imprint of axion-like particles in the highest-energy photons of hard γ-ray blazars
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    R. Buehler, G. Gallardo, G. Maier, A. Domínguez, M. López and M. Meyer

    Axion-like particles (ALPs), predicted in theories beyond the Standard Model, can have observational effects on the transparency of the Universe to γ rays in the presence of magnetic fields. In this work, we search for effects compatible with the existence of ALPs with 80 months of data from the Fermi Large Area Telescope, by comparing the distributions of observed highest energy photons from sources

    更新日期:2020-09-14
  • Black holes with scalar hair in light of the Event Horizon Telescope
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    Mohsen Khodadi, Alireza Allahyari, Sunny Vagnozzi and David F. Mota

    Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of additional scalar fields. The first observation of a black hole (BH) shadow by the Event Horizon Telescope (EHT) has opened a new direct window onto tests of gravity in the strong-field regime, including probes of violations of

    更新日期:2020-09-14
  • Primordial black hole dark matter and the LIGO/Virgo observations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    Karsten Jedamzik

    The LIGO/Virgo collaboration have by now detected the mergers of ten black hole binaries via the emission of gravitational radiation. The hypothesis that these black holes have formed during the cosmic QCD epoch and make up all of the cosmic dark matter, has been rejected by many authors reasoning that, among other constraints, primordial black hole (PBH) dark matter would lead to orders of magnitude

    更新日期:2020-09-14
  • Complete predictions for high-energy neutrino propagation in matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    Alfonso Garcia, Rhorry Gauld, Aart Heijboer and Juan Rojo

    We present predictions for the interactions of energetic neutrinos with matter as they propagate through Earth towards large-volume detectors. Our results are based on state-of-the-art calculations of the high-energy neutrino-matter interaction cross-sections, which we have implemented in the HEDIS module of GENIE . In addition to the dominant interaction process, deep inelastic scattering off quarks

    更新日期:2020-09-14
  • Primordial black hole formation by vacuum bubbles. Part II
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-13
    Heling Deng

    The discoveries of LIGO/Virgo black holes in recent years have revitalized the study of primordial black holes. In this work we investigate a mechanism where primordial black holes are formed by vacuum bubbles that randomly nucleate during inflation through quantum tunneling. After inflation, these bubbles typically run into the ambient radiation fluid with a large Lorentz factor. In our previous work

    更新日期:2020-09-14
  • Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709
    Meteorit. Planet. Sci. (IF 2.863) Pub Date : 2020-09-12
    Alex M. Ruzicka; Jon M. Friedrich; Melinda L. Hutson; Juliette W. Strasser; Robert J. Macke; Mark L. Rivers; Richard C. Greenwood; Karen Ziegler; Richard N. Pugh

    Northwest Africa (NWA) 8709 is a rare example of a type 3 ordinary chondrite melt breccia and provides critical information for the shock compaction histories of chondrites. An L3 protolith for NWA 8709 is inferred on the basis of oxygen isotope composition, elemental composition, diverse mineral chemistry, and overall texture. NWA 8709 is among the most strongly shocked type 3 chondrites known, and

    更新日期:2020-09-12
  • Demystification of nonrelativistic theories in curved background
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-11
    Rabin Banerjee

    We discuss a new formalism for constructing a nonrelativistic (NR) theory in curved background. Named as galilean gauge theory, it is based on gauging the global galilean symmetry. It provides a systematic algorithm for obtaining the covariant curved spacetime generalisation of any NR theory defined in flat spacetime. The resulting background is just the Newton–Cartan manifold. The example of NR free

    更新日期:2020-09-12
  • Deflection of light by a rotating black hole surrounded by “quintessence”
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-11
    Prateek Sharma; Hemwati Nandan; Radouane Gannouji; Rashmi Uniyal; Amare Abebe

    We present a detailed analysis of a rotating black hole surrounded by “quintessence.” This solution represents a fluid with a constant equation of state, w, which can for example describe an effective warm dark matter fluid around a black hole. We clarify the conditions for the existence of such a solution and study its structure by analyzing the existence of horizons as well as the extremal case.

    更新日期:2020-09-12
  • The October 10, 1912 solar eclipse expeditions and the first attempt to measure light bending by the Sun
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-18
    Luís C. B. Crispino

    In 1911, Einstein proposed that light bending by the Sun’s gravitational field could be measured during a total solar eclipse. The first opportunity in which this measurement would be tried was during the total solar eclipse of October 10, 1912. We report about the expeditions sent to Brazil to observe this eclipse, including the one from the Córdoba Observatory, from Argentina, which aimed to measure

    更新日期:2020-09-11
  • Hadamard parametrix of the Feynman Green’s function of a five-dimensional charged scalar field
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-13
    Visakan Balakumar; Elizabeth Winstanley

    The Hadamard parametrix is a representation of the short-distance singularity structure of the Feynman Green’s function for a quantum field on a curved spacetime background. Subtracting these divergent terms regularizes the Feynman Green’s function and enables the computation of renormalized expectation values of observables. We study the Hadamard parametrix for a charged, massive, complex scalar field

    更新日期:2020-09-11
  • Gaussian null coordinates, near-horizon geometry and conserved charges on the horizon of extremal nondilatonic black p-branes
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-17
    Mirjam Cvetič; Paulo J. Porfírio; Alejandro Satz

    In this paper, we examine the emergence of conserved charges on the horizon of a particular class of extremal nondilatonic black p-branes (which reduce to extremal dilatonic black holes in D=4 dimensions upon toroidal compactification) in the presence of a probe massless scalar field in the bulk. This result is achieved by writing the black p-brane geometry in a Gaussian null coordinate system which

    更新日期:2020-09-11
  • Shadows of charged rotating black holes: Kerr–Newman versus Kerr–Sen
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-12
    Sérgio Vinicius Monteiro C. B. Xavier; Pedro V. P. Cunha; Luís C. B. Crispino; Carlos A. R. Herdeiro

    Celebrating the centennial of its first experimental test, the theory of General Relativity (GR) has successfully and consistently passed all subsequent tests with flying colors. It is expected, however, that at certain scales new physics, in particular, in the form of quantum corrections, will emerge, changing some of the predictions of GR, which is a classical theory. In this respect, black holes

    更新日期:2020-09-11
  • Scalar radiation emitted by a source around a spherically symmetric black hole
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-21
    Rafael P. Bernar

    We analyze the scalar radiation emitted by a source in a circular geodesic orbit around a spherically symmetric black hole. The black hole (BH) spacetime considered is quite general, in the sense that it encompasses the solutions of Schwarzschild and Reissner–Nordström, and also the Bardeen solution of a regular BH. We use the framework of quantum field theory in curved spaces to compute the one-particle

    更新日期:2020-09-11
  • Generating solutions of Ricci-Based Gravity theories from General Relativity
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-07
    Emanuele Orazi

    We generalize the algorithm that establishes the correspondence between metric-affine Eddington-inspired Born-Infeld (EiBI) gravity and General Relativity (GR) to any bosonic matter sector. Along the way, a polished version of the proof of existence of a metric compatible frame associated to any metric-affine Ricci-Based Gravity (RBG) is presented. Particular attention is given to the problem of generating

    更新日期:2020-09-11
  • Role of gravity in particle physics: A unified approach
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-12
    Pedro D. Alvarez; Mauricio Valenzuela; Jorge Zanelli

    General Relativity (GR) and the Standard Model (SM) of particle physics are two enormously successful frameworks for our understanding the fundamental laws of nature. However, these theoretical schemes are widely disconnected, logically independent and unrelated in scope. Yet, GR and SM at some point must intersect, producing claims about phenomena that should be reconciled. Be it as it may, both schemes

    更新日期:2020-09-11
  • Stationary scalar and vector clouds around Kerr–Newman black holes
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-13
    Nuno M. Santos; Carlos A. R. Herdeiro

    Massive bosons in the vicinity of Kerr–Newman black holes can form pure bound states when their phase angular velocity fulfills the synchronization condition, i.e. at the threshold of superradiance. The presence of these stationary clouds at the linear level is intimately linked to the existence of Kerr black holes with synchronized hair at the nonlinear level. These configurations are very similar

    更新日期:2020-09-11
  • Tidal forces in the charged Hayward black hole spacetime
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-07
    Haroldo C. D. Lima Junior; Luís C. B. Crispino

    Tidal forces produced by black holes are an important result of General Relativity related to the spacetime curvature tensor. Among the astrophysical implications of tidal forces, the tidal disruption events stand out. We analyze the tidal forces in the spacetime of an electrically charged Hayward regular black hole, obtaining the components of the tidal tensor and the geodesic deviation equation.

    更新日期:2020-09-11
  • Astrophysical implications of neutron star inspiral and coalescence
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-13
    John L. Friedman; Nikolaos Stergioulas

    The first inspiral of two neutron stars observed in gravitational waves was remarkably close, allowing the kind of simultaneous gravitational wave and electromagnetic observation that had not been expected for several years. Their merger, followed by a gamma-ray burst and a kilonova, was observed across the spectral bands of electromagnetic telescopes. These GW and electromagnetic observations have

    更新日期:2020-09-11
  • Static black holes without spatial isometries: From AdS multipoles to electrovacuum scalarization
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-13
    Carlos Herdeiro; Eugen Radu

    We review recent results on the existence of static black holes (BHs) without spatial isometries in four spacetime dimensions and propose a general framework for their study. These configurations are regular on and outside a horizon of spherical topology. Two different mechanisms allowing for their existence are identified. The first one relies on the presence of a solitonic limit of the BHs; when

    更新日期:2020-09-11
  • Does gravitational radiation impact the stellar habitable zone?
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-25
    J. A. S. Lima; R. C. Santos; J. V. Cunha; F. E. Silva; C. E. Pellicer

    Substellar objects of ultrashort periods (less than 50 min) orbiting central stars and many ultracompact star binary systems of even smaller periods (less than 10 min) have been optically detected in the last few years. Their gravitational luminosities can be of the same order or even much greater than their electromagnetic counterparts thereby also comprising a special class of targets for the Large

    更新日期:2020-09-11
  • Analytical investigation of wave absorption by a rotating black hole analogue
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-08-05
    Leandro A. Oliveira; Carolina L. Benone; Amanda L. Almeida; Luís C. B. Crispino

    Perturbations in a draining vortex can be described analytically in terms of confluent Heun functions. In the context of analogue models of gravity in ideal fluids, we investigate analytically the absorption length of waves in a draining bathtub, a rotating black hole analogue, using confluent Heun functions. We compare our analytical results with the corresponding numerical ones, obtaining excellent

    更新日期:2020-09-11
  • Compact objects in general relativity: From Buchdahl stars to quasiblack holes
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-07-30
    José P. S. Lemos; Oleg B. Zaslavskii

    A Buchdahl star is a highly compact star for which the boundary radius R obeys R=98r+, where r+ is the gravitational radius of the star itself. A quasiblack hole is a maximum compact star, or more generically a maximum compact object, for which the boundary radius R obeys R=r+. Quasiblack holes are objects on the verge of becoming black holes. Continued gravitational collapse ends in black holes and

    更新日期:2020-09-11
  • What will it take to measure individual neutrino mass states using cosmology?
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-09
    Maria Archidiacono, Steen Hannestad and Julien Lesgourgues

    We study the impact of assumptions made about the neutrino mass ordering on cosmological parameter estimation with the purpose of understanding whether in the future it will be possible to infer the specific neutrino mass distribution from cosmological data. We find that although the commonly used assumption of a degenerate neutrino hierarchy is manifestly wrong and leads to changes in cosmological

    更新日期:2020-09-10
  • Beyond Einstein’s General Relativity: Hybrid metric-Palatini gravity and curvature-matter couplings
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    Tiberiu Harko; Francisco S. N. Lobo

    Einstein’s General Relativity (GR) is possibly one of the greatest intellectual achievements ever conceived by the human mind. In fact, over the last century, GR has proven to be an extremely successful theory, with a well established experimental footing, at least for weak gravitational fields. Its predictions range from the existence of black holes and gravitational radiation (now confirmed) to the

    更新日期:2020-09-10
  • The hidden scalar Lagrangians within Horndeski theory
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    Gregory W. Horndeski

    In this paper, I show that there exists a new way to obtain scalar–tensor field theories by combining a special scalar field on the cotangent bundle with a scalar field on spacetime. These two scalar fields act as a generating function for the metric tensor. When using these two scalar fields in the Horndeski Lagrangians, we discover, while seeking Friedmann–Lemaître–Robertson–Walker-type cosmological

    更新日期:2020-09-10
  • Horizons 2020
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    D. Grumiller; M. M. Sheikh-Jabbari; C. Zwikel

    Horizons of black holes or cosmologies are peculiar loci of spacetime, where interesting physical effects take place, some of which are probed by recent (EHT and LIGO) and future experiments (ET and LISA). We discuss that there are boundary degrees of freedom residing at the horizon. We describe their symmetries and their interactions with gravitational waves. This fits into a larger picture of boundary

    更新日期:2020-09-10
  • How black holes store information in high-order correlations
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    Charis Anastopoulos; Konstantina Savvidou

    We explain how Hawking radiation stores significant amount of information in high-order correlations of quantum fields. This information can be retrieved by multi-time measurements on the quantum fields close to the black hole horizon. This result requires no assumptions about quantum gravity, it takes into account the differences between Gibbs’s and Boltzmann’s accounts of thermodynamics, and it clarifies

    更新日期:2020-09-10
  • You can see a clock running backwards in time
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    M. B. Paranjape

    The epitome of a causal or anti-chronological behavior would be to see a clock running backwards in time. In this essay, we point out that this is indeed possible, but there is no problem with causality. What you see is not what is really happening. Locally, causality is always respected. However, our observation should be cause for pause to astronomers and cosmologists, who strictly observe events

    更新日期:2020-09-10
  • Magnetized cosmological model with variable deceleration parameter
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    Sankarsan Tarai; Fakhereh Md. Esmaeili; B. Mishra; S. K. Tripathy

    In this paper, we have derived the field equations in an extended theory of gravity in an anisotropic spacetime background and in the presence of magnetic field. The physical and geometrical parameters of the models are determined with respect to the Hubble parameter using some algebraic approaches. A time varying scale factor has been introduced to analyze the behavior of the model. From some diagnostic

    更新日期:2020-09-10
  • De Sitter scalar–spinor interaction in Minkowski limit
    Int. J. Mod. Phys. D (IF 2.154) Pub Date : 2020-09-09
    Y. Ahmadi

    The scalar–spinor interaction Lagrangian is presented by the Yukawa potential. In dS ambient space formalism, the interaction Lagrangian of scalar–spinor fields was obtained from a new transformation which is very similar to the gauge theory. The interaction of massless minimally coupled (mmc) scalar and spinor fields was investigated. The Minkowski limit of the mmc scalar field and massive spinor

    更新日期:2020-09-10
  • Non-Kähler deformed conifold, ultraviolet completion and supersymmetric constraints in the baryonic branch
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    Keshav Dasgupta; Jake Elituv; Maxim Emelin; Anh-Khoi Trinh

    Gravity duals for a class of UV complete minimally supersymmetric nonconformal gauge theories require deformed conifolds with fluxes. However these manifolds do not allow for the standard Kähler or conformally Kähler metrics on them, instead the metrics are fully non-Kähler. We take a generic such configuration of a non-Kähler deformed conifold with fluxes and ask what constraints do supersymmetry

    更新日期:2020-09-10
  • Quantization of κ-deformed Dirac equation
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-01
    E. Harikumar; Vishnu Rajagopal

    In this paper, we study the quantization of Dirac field theory in the κ-deformed space–time. We adopt a quantization method that uses only equations of motion for quantizing the field. Starting from κ-deformed Dirac equation, valid up to first order in the deformation parameter a, we derive deformed unequal time anticommutation relation between deformed field and its adjoint, leading to undeformed

    更新日期:2020-09-10
  • The Landau problem and nonclassicality
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-03
    G. X. A. Petronilo; S. C. Ulhoa; K. V. S. Araújo; R. A. S. Paiva; R. G. G. Amorim; A. E. Santana

    Exploring the concept of the extended Galilei group G. Representations for field theories in a symplectic manifold have been derived in association with the method of the Wigner function. The representation is written in the light-cone of a de Sitter space–time in five dimensions. A Hilbert space is constructed, endowed with a symplectic structure, which is used as a representation space for the Lie

    更新日期:2020-09-10
  • Traversable wormhole modelling with exponential and hyperbolic shape functions in F(R,T) framework
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    Shweta; Ambuj Kumar Mishra; Umesh Kumar Sharma

    The concept of traversable wormhole, a hypothetical tunnel-like structure is initially proposed by Morris and Thorne (Am. J. Phys.56, 395 (1988)) by using Einstein’s general relativity theory. Harko et al. (Phys. Rev. D84, 024020 (2011)) defined F(R,T) gravity as an extended gravitational theory having terms R and T as Ricci scalar and trace of energy momentum respectively. In this article, we explore

    更新日期:2020-09-10
  • Electron propagator solution for an inhomogeneous magnetic field in the momentum space representation
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-03
    H. Hamdi; H. Benzair

    The relativistic quantum mechanics of the electron in an inhomogeneous magnetic field problem is solved exactly in terms of the momentum space path integral formalism. We adopt the space–time transformation methods, which are α-point discretization dependent, to evaluate quantum corrections. The propagator is calculated, the energy eigenvalues and their associated curves are illustrated. The limit

    更新日期:2020-09-10
  • Light CP-odd Higgs boson production of the NMSSM in bottom-gluon fusion at the LHC
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    M. M. Almarashi

    We study the τ+τ− decay mode of a light CP-odd Higgs boson of the NMSSM, a1, produced in bottom-gluon fusion at the LHC. It is shown that for high luminosity of the LHC, there exist regions of the NMSSM parameter space that can be exploited to detect the a1 through this channel.

    更新日期:2020-09-10
  • Complexity growth for topological black holes by holographic method
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    Koichi Nagasaki

    We consider the growth of the action for black hole space–time with a fundamental string. Our interest is to find the difference of the behavior between black holes with three different topologies in the scenario of complexity-action conjecture. These black holes have positive, negative and zero curvatures. We would like to calculate the action growth of these systems with a probe fundamental string

    更新日期:2020-09-10
  • The vacuum electromagnetic energy density — Towards a physical comprehension of the vacuum energy scale problem
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    Constantin Meis

    The electromagnetic field ground state, a zero-energy cosmic field permeating all of space, issues naturally from Maxwell’s electromagnetic theory and its fluctuations may generate transient photons conferring a physical solution to the vacuum energy scale problem. They are more significant at long wavelengths underlying principally the low frequency up to infrared cosmic radiation background. Assuming

    更新日期:2020-09-10
  • Kerr–Bolt black hole entropy and soft hair
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-10
    M. R. Setare; A. Jalali

    Recently it has been speculated that a set of infinitesimal VirasoroL⊗VirasoroR diffeomorphisms exist which act nontrivially on the horizon of some black holes such as Kerr and Kerr–Newman black holes.1,2 Having applied this symmetry in covariant phase space formalism, one can obtain Virasoro charges as surface integrals on the horizon. Kerr–Bolt space–time is well known for its asymptotically topology

    更新日期:2020-09-10
  • Comment on: “Some quantum aspects of a particle with electric quadrupole moment interacting with an electric field subject to confining potentials”
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-09-03
    Francisco M. Fernández

    We analyze the results obtained from a model consisting of the interaction between the electric quadrupole moment of a moving particle and an electric field. We argue that the system does not support bound states because the motion along the z axis is unbounded. It is shown that the author obtains a wrong bound-state spectrum for the motion in the x−y plane and that the existence of allowed cyclotron

    更新日期:2020-09-10
  • Sulfide‐dominated partial melting pathways in brachinites
    Meteorit. Planet. Sci. (IF 2.863) Pub Date : 2020-09-09
    Samuel D. Crossley; Richard D. Ash; Jessica M. Sunshine; Catherine M. Corrigan; Timothy J. McCoy; David W. Mittlefehldt; Igor S. Puchtel

    Petrogenetic relationships among members of the brachinite family were established by analyzing major and trace element concentrations of minerals for 9 representative specimens: Al Huwaysah 010, Eagles Nest, Northwest Africa (NWA) 4882, NWA 5363, NWA 7297, NWA 7299, NWA 11756, Ramlat as Sahmah (RaS) 309, and Reid 013. The brachinite family, which includes brachinites and ungrouped achondrites with

    更新日期:2020-09-10
  • Two-particle contributions and nonlocal effects in the QCD sum rules for the axial vector tetraquark candidate Zc(3900)
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-08-24
    Zhi-Gang Wang

    In this article, we study the Zc(3900) with the QCD sum rules in details by including the two-particle scattering state contributions and nonlocal effects between the diquark and antidiquark constituents. The two-particle scattering state contributions cannot saturate the QCD sum rules at the hadron side, the contribution of the Zc(3900) plays an unsubstitutable role, we can saturate the QCD sum rules

    更新日期:2020-09-10
  • Multicritical points of unitary matrix model with logarithmic potential identified with Argyres–Douglas points
    Int. J. Mod. Phys. A (IF 1.486) Pub Date : 2020-08-31
    H. Itoyama; T. Oota; Katsuya Yano

    In our recent publications, the partition function of the Gross–Witten–Wadia unitary matrix model with the logarithmic term has been identified with the τ function of a certain Painlevé system, and the double scaling limit of the associated discrete Painlevé equation to the critical point provides us with the Painlevé II equation. This limit captures the critical behavior of the su(2), Nf=2, 𝒩=2 supersymmetric

    更新日期:2020-09-10
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