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SCOAP3Modeling Particle Transport in Astrophysical Outflows and Simulations of Associated Emissions from Hadronic Microquasar Jets Kosmas, O.T., Papadopoulos, D.A., Ganatsios, S.... more(3) Hindawi 20220208 In this work, after improving the formulation of the model on particle transport within astrophysical plasma outflows and constructing the appropriate algorithms, we test the reliability and effectiveness of our method through numerical simulations on wellstudied galactic microquasars as the SS 433 and the Cyg X1 systems. Then, we concentrate on predictions of the associated emissions, focusing on detectable highenergy neutrinos and $\gamma $rays originated from the extragalactic M33 X7 system, which is an Xray binary discovered in 2006, located in the neighboring galaxy Messier 33, and has not yet been modeled in detail. The particle and radiation energy distributions, produced from magnetized hadronic astrophysical jets in the context of our method, are assumed to originate from decay and scattering processes taking place among the secondary particles created when hot (relativistic) protons of the jet scatter on thermal (cold) ones (pp interaction mechanism inside the jet). These distributions are computed by solving the system of coupled integrodifferential transport equations of multiparticle processes (reactions chain) following the inelastic protonproton (pp) collisions. For the detection of such highenergy neutrinos as well as multiwavelength (radio, Xray, and gammaray) emissions, extremely sensitive space telescopes and other $\gamma $ray and neutrino detection instruments are in operation or have been designed like the CTA, IceCube, ANTARES, KM3NeT, and IceCubeGen2.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/68096view Article Title Modeling Particle Transport in Astrophysical Outflows and Simulations of Associated Emissions from Hadronic Microquasar JetsAuthors Kosmas, O.T.; Papadopoulos, D.A.; Ganatsios, S.Abstract In this work, after improving the formulation of the model on particle transport within astrophysical plasma outflows and constructing the appropriate algorithms, we test the reliability and effectiveness of our method through numerical simulations on wellstudied galactic microquasars as the SS 433 and the Cyg X1 systems. Then, we concentrate on predictions of the associated emissions, focusing on detectable highenergy neutrinos and $\gamma $rays originated from the extragalactic M33 X7 system, which is an Xray binary discovered in 2006, located in the neighboring galaxy Messier 33, and has not yet been modeled in detail. The particle and radiation energy distributions, produced from magnetized hadronic astrophysical jets in the context of our method, are assumed to originate from decay and scattering processes taking place among the secondary particles created when hot (relativistic) protons of the jet scatter on thermal (cold) ones (pp interaction mechanism inside the jet). These distributions are computed by solving the system of coupled integrodifferential transport equations of multiparticle processes (reactions chain) following the inelastic protonproton (pp) collisions. For the detection of such highenergy neutrinos as well as multiwavelength (radio, Xray, and gammaray) emissions, extremely sensitive space telescopes and other $\gamma $ray and neutrino detection instruments are in operation or have been designed like the CTA, IceCube, ANTARES, KM3NeT, and IceCubeGen2.Is Part Of AHEP 2022 , 8146675 Identifier ISSN: DOI 10.1155/2022/8146675Publisher HindawiCategory Resources PDF: http://repo.scoap3.org/api/files/028a32af180f48e1b8d751114bf1f2a5/10.1155/2022/8146675.a.pdf
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SCOAP3QuarkAntiquark Effective Potential in Symplectic Quantum Mechanics Petronilo, Gustavo, Luz, Renato, de Santana, Ademir, ... more(6) Hindawi 20220207 In this paper, we study within the structure of Symplectic Quantum Mechanics a bidimensional nonrelativistic strong interaction system which represent the bound state of heavy quarkantiquark, where we consider a Cornell potential which consists of Coulombtype plus linear potentials. First, we solve the Schrödinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schrödingerlike equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, and the nonclassicality of ground state and first excited state is studied by the nonclassicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the nonclassic nature of meson system than the wavefunction does phase space.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/68074view Article Title QuarkAntiquark Effective Potential in Symplectic Quantum MechanicsAuthors Petronilo, Gustavo; Luz, Renato; de Santana, Ademir; Costa, Caroline; Amorim, Ronni; Paiva, RendisleyAbstract In this paper, we study within the structure of Symplectic Quantum Mechanics a bidimensional nonrelativistic strong interaction system which represent the bound state of heavy quarkantiquark, where we consider a Cornell potential which consists of Coulombtype plus linear potentials. First, we solve the Schrödinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schrödingerlike equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, and the nonclassicality of ground state and first excited state is studied by the nonclassicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the nonclassic nature of meson system than the wavefunction does phase space.Is Part Of AHEP 2022 , 3409776 Identifier ISSN: DOI 10.1155/2022/3409776Publisher HindawiCategory Resources PDF: http://repo.scoap3.org/api/files/1703607831664604be7bdec39cf85c20/10.1155/2022/3409776.a.pdf
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SCOAP3Towards a Numerical Solution of the Bosonic MasterField Equation of the IIB Matrix Model Klinkhamer, F.R. Jagiellonian University 20220207 A direct algebraic solution has been obtained from the full bosonic masterfield equation of the IIB matrix model for low dimensionality \(D=3\) and small matrix size \(N=3\). A different method is needed for larger values of \(D\) and \(N\). Here, we explore an indirect numerical approach and obtain an approximate numerical solution for the nontrivial case \((D,\,N)=(10,\,4)\) with a complex Pfaffian. We also present a suggestion for numerical calculations at larger values of \(N\).
Subject Source SCOAP3 URL https://repo.scoap3.org/records/68007view Article Title Towards a Numerical Solution of the Bosonic MasterField Equation of the IIB Matrix ModelAuthors Klinkhamer, F.R.Abstract A direct algebraic solution has been obtained from the full bosonic masterfield equation of the IIB matrix model for low dimensionality \(D=3\) and small matrix size \(N=3\). A different method is needed for larger values of \(D\) and \(N\). Here, we explore an indirect numerical approach and obtain an approximate numerical solution for the nontrivial case \((D,\,N)=(10,\,4)\) with a complex Pfaffian. We also present a suggestion for numerical calculations at larger values of \(N\).Is Part Of APPB 2022 , Vol.B53 , A5.118 Identifier ISSN: DOI 10.5506/APhysPolB.53.1A5Publisher Jagiellonian UniversityCategory Resources PDF: http://repo.scoap3.org/api/files/9c55f79579eb47cf8085d6a13e21bc7c/10.5506/APhysPolB.53.1A5.pdfa
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SCOAP3Erratum to “The Polyakov loop dependence of bulk viscosity of QCD matter” [Nucl. Phys. B 974 (2022) 115635] Mukhopadhyay, Debmalya, Alam, Jane, Kumar, R.... more(3) Elsevier 20220131
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67925view Article Title Erratum to “The Polyakov loop dependence of bulk viscosity of QCD matter” [Nucl. Phys. B 974 (2022) 115635]Authors Mukhopadhyay, Debmalya; Alam, Jane; Kumar, R.Is Part Of NPB 2022 , Vol.B975 C , 115685 Identifier ISSN: DOI 10.1016/j.nuclphysb.2022.115685Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/8a950573c9dc4894862fae9c5355c093/10.1016/j.nuclphysb.2022.115685.pdf
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SCOAP3Radiative corrections in metricaffine bumblebee model Delhom, Adria, Nascimento, J.R., Olmo, Gonzalo J., ... more(5) Elsevier 20220129 We consider the metricaffine formulation of bumblebee gravity, derive the field equations, and show that the connection can be written as LeviCivita of a disformally related metric in which the bumblebee field determines the disformal part. As a consequence, the bumblebee field gets coupled to all the other matter fields present in the theory, potentially leading to nontrivial phenomenological effects. To explore this issue we compute the weakfield limit and study the resulting effective theory. In this scenario, we couple scalar and spinorial matter to the effective metric which, besides the zerothorder Minkowskian contribution, also has the vector field contributions of the bumblebee, and show that it is renormalizable at oneloop level. From our analysis it also follows that the nonmetricity of this theory is determined by the gradient of the bumblebee field, and that it can acquire a vacuum expectation value due to the contribution of the bumblebee field.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67780view Article Title Radiative corrections in metricaffine bumblebee modelAuthors Delhom, Adria; Nascimento, J.R.; Olmo, Gonzalo J.; Petrov, A.Yu.; Porfírio, P.J.Abstract We consider the metricaffine formulation of bumblebee gravity, derive the field equations, and show that the connection can be written as LeviCivita of a disformally related metric in which the bumblebee field determines the disformal part. As a consequence, the bumblebee field gets coupled to all the other matter fields present in the theory, potentially leading to nontrivial phenomenological effects. To explore this issue we compute the weakfield limit and study the resulting effective theory. In this scenario, we couple scalar and spinorial matter to the effective metric which, besides the zerothorder Minkowskian contribution, also has the vector field contributions of the bumblebee, and show that it is renormalizable at oneloop level. From our analysis it also follows that the nonmetricity of this theory is determined by the gradient of the bumblebee field, and that it can acquire a vacuum expectation value due to the contribution of the bumblebee field.Is Part Of PLB 2022 , Vol.B826 C , 136932 Identifier ISSN: DOI 10.1016/j.physletb.2022.136932Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/8b2ce3fc184f470ba7a1c99759883beb/10.1016/j.physletb.2022.136932.pdf
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SCOAP3Fingerprints of the quantum spacetime in timedependent quantum mechanics: An emergent geometric phase Chakraborty, Anwesha, Nandi, Partha, Chakraborty, Biswajit... more(3) Elsevier 20220129 We show the emergence of Berry phase in a forced harmonic oscillator system placed in the quantum spacetime of Moyal type, where the time ‘t’ is also an operator. An effective commutative description of the system gives a time dependent generalised harmonic oscillator system with perturbation linear in position and momentum. The system is then diagonalised to get a generalised harmonic oscillator and then its adiabatic evolution over timeperiod $T$ is studied in Heisenberg picture to compute the expression of geometric phaseshift.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67852view Article Title Fingerprints of the quantum spacetime in timedependent quantum mechanics: An emergent geometric phaseAuthors Chakraborty, Anwesha; Nandi, Partha; Chakraborty, BiswajitAbstract We show the emergence of Berry phase in a forced harmonic oscillator system placed in the quantum spacetime of Moyal type, where the time ‘t’ is also an operator. An effective commutative description of the system gives a time dependent generalised harmonic oscillator system with perturbation linear in position and momentum. The system is then diagonalised to get a generalised harmonic oscillator and then its adiabatic evolution over timeperiod $T$ is studied in Heisenberg picture to compute the expression of geometric phaseshift.Is Part Of NPB 2022 , Vol.B975 C , 115691 Identifier ISSN: DOI 10.1016/j.nuclphysb.2022.115691Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/e4993fe7f6de443e94197f0613c462f1/10.1016/j.nuclphysb.2022.115691.pdf
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SCOAP3Towards the web of quantum chaos diagnostics Bhattacharyya, Arpan, Chemissany, Wissam, Haque, S., ... more(4) Springer 20220129 We study the connections between three quantities that can be used as diagnostics for quantum chaos, i.e., the outoftimeorder correlator (OTOC), Loschmidt echo (LE), and complexity. We generalize the connection between OTOC and LE for infinite dimensions and extend it for higherorder OTOCs and multifold LEs. Novel applications of this intrinsic relation are proposed. We also investigated the relationship between a specific circuit complexity and LE by using the inverted oscillator model and made a conjecture about their relationship. These relationships signal a deeper connection between these three probes of quantum chaos.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67869view Article Title Towards the web of quantum chaos diagnosticsAuthors Bhattacharyya, Arpan; Chemissany, Wissam; Haque, S.; Yan, BinAbstract We study the connections between three quantities that can be used as diagnostics for quantum chaos, i.e., the outoftimeorder correlator (OTOC), Loschmidt echo (LE), and complexity. We generalize the connection between OTOC and LE for infinite dimensions and extend it for higherorder OTOCs and multifold LEs. Novel applications of this intrinsic relation are proposed. We also investigated the relationship between a specific circuit complexity and LE by using the inverted oscillator model and made a conjecture about their relationship. These relationships signal a deeper connection between these three probes of quantum chaos.Is Part Of EPJC 2022 , Vol.C82 , 117 Identifier ISSN: DOI 10.1140/epjc/s10052022100353Publisher SpringerCategory Resources PDF: http://repo.scoap3.org/api/files/21386162cc994daea6f2c962af6963f4/10.1140/epjc/s10052022100353_a.pdf
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SCOAP3Phasespace consideration on barrier transmission in a timedependent variational approach with superposed wave packets Ono, Akira Elsevier 20220129 A known limitation of timedependent meanfield approaches is a lack of quantum tunneling for collective motions such as in subbarrier fusion reactions. As a first step toward a solution, a timedependent model is considered using a superposition of Gaussian wave packets, to describe the relative motion between two colliding nuclei, which may be simplified to a problem for one particle in one dimension. In this article, how the model describes the potentialbarrier transmission is investigated by paying attention to the time evolution of the phase space distribution, which in particular reveals that the behavior of the free propagation of the incoming state is not trivial, depending on the number of superposed wave packets. Passage over the barrier can occur due to the highmomentum components in the incoming state corresponding to energies above the barrier height, which is, however, of classical nature and needs to be distinguished from the true quantum tunneling. Although a transmitted wave packet in some case may end up with an energy lower than the barrier, a difficulty is noticed in guaranteeing the energy conservation when the energies of different exit channels, e.g. of transmission and reflection, are individually measured. To overcome these issues for a description of quantum tunneling is still a challenging problem. This article mainly treats the same system with the same model as in the paper Hasegawa, Hagino and Tanimura (2020) [1]. However, we reach different conclusions.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67778view Article Title Phasespace consideration on barrier transmission in a timedependent variational approach with superposed wave packetsAuthors Ono, AkiraAbstract A known limitation of timedependent meanfield approaches is a lack of quantum tunneling for collective motions such as in subbarrier fusion reactions. As a first step toward a solution, a timedependent model is considered using a superposition of Gaussian wave packets, to describe the relative motion between two colliding nuclei, which may be simplified to a problem for one particle in one dimension. In this article, how the model describes the potentialbarrier transmission is investigated by paying attention to the time evolution of the phase space distribution, which in particular reveals that the behavior of the free propagation of the incoming state is not trivial, depending on the number of superposed wave packets. Passage over the barrier can occur due to the highmomentum components in the incoming state corresponding to energies above the barrier height, which is, however, of classical nature and needs to be distinguished from the true quantum tunneling. Although a transmitted wave packet in some case may end up with an energy lower than the barrier, a difficulty is noticed in guaranteeing the energy conservation when the energies of different exit channels, e.g. of transmission and reflection, are individually measured. To overcome these issues for a description of quantum tunneling is still a challenging problem. This article mainly treats the same system with the same model as in the paper Hasegawa, Hagino and Tanimura (2020) [1]. However, we reach different conclusions.Is Part Of PLB 2022 , Vol.B826 C , 136931 Identifier ISSN: DOI 10.1016/j.physletb.2022.136931Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/e995cd7c05e34b3db1d160b4d0e064b6/10.1016/j.physletb.2022.136931.pdf
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SCOAP3Large numbers in holography McInnes, Brett Elsevier 20220129 The AdS/CFT correspondence is useful primarily when the number of colours, ${N}_{\text{c}}$, characterising the boundary field theory, is “large”, and when the mass of the bulk black hole that is usually present is “large” relative to the bulk Planck mass. But this prompts two questions: first, can these large numbers be estimated, even very approximately, in a given application? Second: if these quantities are themselves computed holographically from physical data constraining the field theory, is this computation selfconsistent, in the sense that it actually produces large numbers — an outcome which is far from obvious? Here we consider these questions in the case of the application of holographic techniques to the study of the quarkgluon plasma. We find that holography in this case is able to generate estimates of the dimensionless numbers in question, and, very remarkably, they are indeed large, despite the fact that the dimensionless input data are of order unity.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67784view Article Title Large numbers in holographyAuthors McInnes, BrettAbstract The AdS/CFT correspondence is useful primarily when the number of colours, ${N}_{\text{c}}$, characterising the boundary field theory, is “large”, and when the mass of the bulk black hole that is usually present is “large” relative to the bulk Planck mass. But this prompts two questions: first, can these large numbers be estimated, even very approximately, in a given application? Second: if these quantities are themselves computed holographically from physical data constraining the field theory, is this computation selfconsistent, in the sense that it actually produces large numbers — an outcome which is far from obvious? Here we consider these questions in the case of the application of holographic techniques to the study of the quarkgluon plasma. We find that holography in this case is able to generate estimates of the dimensionless numbers in question, and, very remarkably, they are indeed large, despite the fact that the dimensionless input data are of order unity.Is Part Of NPB 2022 , Vol.B975 C , 115687 Identifier ISSN: DOI 10.1016/j.nuclphysb.2022.115687Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/aa015705b9834afea62781a428543510/10.1016/j.nuclphysb.2022.115687.pdf
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SCOAP3EinsteinGaussBonnet gravity coupled to bumblebee field in four dimensional spacetime Ding, Chikun, Chen, Xiongwen, Fu, Xiangyun... more(3) Elsevier 20220129 We study EinsteinGaussBonnet gravity coupled to a bumblebee field which leads to a spontaneous Lorentz symmetry breaking in the gravitational sector. We obtain an exact black hole solution and a cosmological solution in four dimensional spacetime by a regularization scheme. We also obtain a Schwarzschildlike bumblebee black hole solution in Ddimensional spacetime. We find that the bumblebee field doesn't affect the locations of the black hole horizon, but only affects the gravitational potential. That is, its gravitational potential has a minimum value (negative) in the black hole interior and has a positive value $1+\ell $ at short distance $r\to 0$. If the constant ℓ is large enough, then this kind of black hole is practically free from the singularity problem. The thermodynamics and phase transition are also studied. In a cosmological context, it is interesting that the GaussBonnet term has no effect on the conservation of energy equation. A latetime expansion of de Sitter universe can be replicated in an empty space. The GaussBonnet term and the bumblebee field can both actually act as a form of dark energy.
Subject Source SCOAP3 URL https://repo.scoap3.org/records/67855view Article Title EinsteinGaussBonnet gravity coupled to bumblebee field in four dimensional spacetimeAuthors Ding, Chikun; Chen, Xiongwen; Fu, XiangyunAbstract We study EinsteinGaussBonnet gravity coupled to a bumblebee field which leads to a spontaneous Lorentz symmetry breaking in the gravitational sector. We obtain an exact black hole solution and a cosmological solution in four dimensional spacetime by a regularization scheme. We also obtain a Schwarzschildlike bumblebee black hole solution in Ddimensional spacetime. We find that the bumblebee field doesn't affect the locations of the black hole horizon, but only affects the gravitational potential. That is, its gravitational potential has a minimum value (negative) in the black hole interior and has a positive value $1+\ell $ at short distance $r\to 0$. If the constant ℓ is large enough, then this kind of black hole is practically free from the singularity problem. The thermodynamics and phase transition are also studied. In a cosmological context, it is interesting that the GaussBonnet term has no effect on the conservation of energy equation. A latetime expansion of de Sitter universe can be replicated in an empty space. The GaussBonnet term and the bumblebee field can both actually act as a form of dark energy.Is Part Of NPB 2022 , Vol.B975 C , 115688 Identifier ISSN: DOI 10.1016/j.nuclphysb.2022.115688Publisher ElsevierCategory Resources PDF: http://repo.scoap3.org/api/files/67919dcc3be148ed8e9ae53321fc2584/10.1016/j.nuclphysb.2022.115688.pdf
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