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Juan M. Tejeiro 1. In order to compare our numerical results with previous works, we consider initially only the equatorial plane and also apply the Mathisson-Pirani supplementary spin condition for the spinning test particle. Nosotros usamos la formulation de las ecuaciones de Mathisson-Papapetrou-Dixon para este problema en una métrica de Kerr. Para comparar nuestros resultados numéricos con trabajos previos, nosotros consideramos inicialmente solo el plano ecuatorial y aplicamos también la condición suplementaria de espín de Mathisson-Pirani para la partícula de prueba con espín.
In the last decades, important advances have been define angular velocity class 11 in the study of the gravitomagnetic clock effect. Beginning with the seminal work by Cohen and Mashhoon [ 1 ]. In which they presented the influence of the gravitomagnetic field to the proper time of an arbitrary clock about a rotating massive body. In their paper, Cohen and Mashhoon, also showed the possibility of measuring this effect. In this work, we present a theoretical value for the gravitomagnetic clock effect of a spinning test particle orbiting around a rotating massive body.
According with the literature, we find different complementary ways that study the phenomena in regard to the gravitomagnetism clock effect. The first way take two family of observers. They obtain, in the threading point of view, the local spatial angular direction as. Since is angular velocity, Bini et al. Then define evolution trend physical components of the velocities are related to the coordinate angular velocity.
This group study the case when the particle has spin. Define angular velocity class 11 take the Frenet-Serret frame FS associated to worldline of the test particle and calculates with help of the angular velocity the evolution equation of the spin tensor in terms of the FS intrinsic frame [ 56 ]. The work of this group considers the MPD equations and their su-pplementary conditions for the spin and give their answer in terms of angular velocity.
The second group integrates define angular velocity class 11 a closed contour. They take the time for angula loop when the test particle rotates in clockwise and the test particle in opposite sense [ 17 ]. A third group deduces the radial geodesic equation from the line element define angular velocity class 11 the exterior field of a rotating black hole. With this equation yields the solution and calculate the inverse of the azimuthal component of four velocity. Then they introduce the first order correction to the angular velocity.
The clock effect is the difference of theses two orbits [ 8 - 10 ]. The fourth group takes some elements of electromagnetism and does an analogy between Maxwell equations and Einstein linealized equations [ 11 ]. Finally the group that makes a geometric treatment of the gravitomagnetic clock Effect [ 2021 ]. According with velcity papers that work the MPD equations, the novelty of our work is that we calculate numerically the full set of MPD equations for the case of a spinning test particle in a Kerr metric.
Secondly, we take the spin without restrictions in its velocity and spin orientation. In the paper by Kyrian and Semerak the third example is refered to the particular case when the spin is orthogonal to the equatorial plane in a Kerr metric [ 22 ]. In this paper, our aim, it is not only describing the trajectories of spinning test particles, but also to study the clock effect.
Therefore, we calculate numerically the trajectory both in a sense and anguar the other for a circular orbit. We measure the delay time for three situations: two spinless test particles are traveling in the same circular define angular velocity class 11, two spinning what is recessive trait class 10 particles with its spin value orthogonal to equatorial plane and two spinning test particles without restrictions in its spin orientation.
In the literature, deine can find different conditions to fix the center of mass, leading to different kinematical behaviours of the test particles. Therefore the worldline can be determined from physical conside-rations. The first condition is the Mathisson-Pirani condition MP, :. If one uses this condition, the trajectory of the spinning test particle is represented by helical motions. Costa et al. We use this condition when working with the MPD equations in the case of a spinning test particle orbiting a rotating massive body.
The second condition is presented by Corinaldesi and Papapetrou CP, which is given by. The third condition is introduced by Tulczyjew and Dixon TD, and written which is given by. This condition is cova-riant and guarantees the existence and uniqueness of the respective worldline [ 28 ]. This condition provides an implicit relation between the four-momentum and the wordline's tangent vector.
For the study of spinning test particles, we use the equations of motion for a spinning test particle in a gravitational field without any restrictions to its velocity and spin orientation [ 23 ]. They yield the full set of Mathisson-Papapetrou-Dixon equations MPD equations for spinning test particles in the Kerr gravitational field [ 23 ]where they integrate nume-rically the MPD equations for the particular case of the Schwarzschild metric.
For the scope of this work, we will take the MPD equations of motion for a Kerr metric, and additionally we will include the spin of the test particle. This calculation has been made with the Mathisson-Pirani supplementary condition; the trajectories have been obtained by numerical integration, using the Runge-Kutta algorithm [ 29 ]. Presently, there exists an interest in are relationships really worth it study of the effects of the spin on the trajectory of test particles in rotating gravitational fields [ 30 ].
The importance of this topic increases when dealing with phenomena of astrophysics such as accretion discs in rotating black holes, gravitomagnetics effects [ 8 ] or gravitational waves induced by spinning particles orbiting a rotating black hole [ 3132 ]. The new features veelocity the spin-gravity what is identity relation in maths for highly relativistic fermions are considered in [ 33 ] and [ 34 ].
The motion of particles in a gravitational field is given by the geodesic equation. The solution to this equation depends on the particular conditions of the problem, such as the rotation and spin of the test particle, among o-thers; therefore there are different methods for its solution [ 3536 ]. Basically, we take two cases in motion of test particles in a gravitational field of a rotating massive body. The clasx case describes the trajectory of a spinless test particle, and the second one the trajectory of define angular velocity class 11 spinning test particle in a massive rotating body.
In the case of the spinless test particles, some authors yield the set of equations of motion for test particles orbiting around a rotating massive body. The equations of motion are considered both in the define angular velocity class 11 plane [ 37 - 39 belocityand in the non-equatorial plane [ 384041 ] Kheng, L. For the study of test particles in a rotating field, some authors have solved for particular cases the equations of motion both for spinless and for spinning test particles of circular orbits in the equatorial plane of a Kerr metric [ 20313742 - 46 ].
With the aim of proving the equations of motion with which we worked, solve numerically the set of equations of motion obtained via MPD equations both for the spinless particles and agnular spinning particles in the equatorial plane and will compare our results with works that involve astronomy, especially the study of spinning test particles around a rotating central source.
We take do ferns have a dominant sporophyte generation same initial conditions in the two cases for describing the trajectory of both a spinless particle and a spinning particle in the field of a rotating massive body.
Then, we cass the Cartesian coordinates x, y, z dlass the trajectory of two particles that travel in the same orbit but in opposite directions. For the numerical solution, we give the full set define angular velocity class 11 MPD equations explicitly, while that Kyrian and Semerak only name them. Also, we give the complete numerical solution. In the majority of cases, the solutions are partial because it is impossible to solve analytically a define angular velocity class 11 of eleven coupled differential why is causation important in epidemiology. This work is organized as follows.
In Section 2 we give a brief introduction to the MPD equations that work the set of veoocity of motion for test particles, both spinless and spinning in a rotating gravitational field. From the MPD equations, we yield the equations of motion for spinless and spinning test particles. Also, we will give the set of the MPD equations given by Plyatsko et al. In What is placebo in research methodology 3 and 4, we present the gravitomagnetic clock effect via the MPD equations for spinless and spinning test particles.
Then, in Section velocigy, we perform integration and the respective numerical comparison of the coordinate time t for spinless and spinning test particles in the equatorial plane. Finally we make a numerical comparison of the trajectory in Cartesian coordinates for two particles that travel in the same orbit, but in opposite directions. In sefine last section, conclusions and some future works. We shall use geometrized units; Greek indices run from 1 to 4 and Latin indices run from 1 to 3.
In general the MPD equations [ 2427define angular velocity class 1148 ] describe the dynamics of extended bodies in the general theory of relativity which includes any gravitational background. In this work, we will take a body small enough to be able to neglect higher multipoles. According to this restriction the MPD equations are given by. The worldline can be determined from physical considerations [ 49 ]. We found that if we contract the equation. This last equation can be written as.
These variations dfine out at every instant, keeping anggular total momentum define remedial social work [ 75 ]. The above equation can be expressed as. In this case, if the observer were in the center of mass, he would see its centroid at rest then we would have a helical solution. By this condition S i4 is given by. Sometimes for the representation of the spin value, it is more convenient to use the vector spin, which in our case is given by.
In the case of the Kerr defnie, one has two Killing vectors, owing to its stationary and axisymmetric nature. In consequence, Eq. Given that the spinning test body define angular velocity class 11 small enough compare with the characteristic length, this body can be considered as a test particle. In this section, the equations of motion Eqs.
Then, we specify the equations of motion for the case of a spinning test particle for a Kerr metric. According to R. Plyatsko et al. In particular, the Boyer-Lindquist coordinates are represented what exactly does a narcissist want in a relationship. The set of the MPD equations for a spinning particle in relationship meaning in english Kerr clase is given by eleven equations.
The first four equations are. The result is multiplied angjlar S 1 S 2S 3 and with the MP condition 3 we have the relationships [ 53 ] :. After achieving a system of equations of motion for spinning test particles, we solve them numerically. We use the fourth-order Runge Kutta method for obtaining the Cartesian coordinates of the trajectories x, y, z. We calculate the full orbit in Cartesian coordinates x, y, z of a test particle around a rotating massive body for both spinless and spinning test particles.
Then, we make a comparison of the time that a test particle takes to do a lap in the two cases. Equations of motion for a spinning test particle orbiting a massive rotating body. In the last section, we obtained the general scheme for the set of equations clxss motion of a spinning test particle in the gravitational field of a rotating body [ 54 ].
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