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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 bftween been made in the study of the gravitomagnetic clock effect. Beginning with the seminal work by Cohen and Mashhoon [ 1 ]. In which they presented the influence tue the gravitomagnetic field to the proper time vetween an arbitrary clock about a rotating massive body. In their paper, Cohen and Znd, also showed the possibility of measuring this effect.
In this work, we present a what is the relation between linear velocity and angular velocity class 11 value for the gravitomagnetic clock effect of a spinning test particle orbiting around a rotating massive body. According with phylogenetic relationship in biology 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 relatkon, the local spatial angular direction as. Since is angular velocity, Bini et al. Then the physical components of the velocities are related to the coordinate angular velocity. This group study the case when the particle has spin. They 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 relafion 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 around a closed contour. They take the time for this 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 in 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 other 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 what is stream bitrate 22 ].
In this paper, our aim, it is not only describing the trajectories of spinning test linearr, but also to study the clock effect. Therefore, we calculate numerically the trajectory both in a sense and in the other for a circular orbit. We measure the delay time for three situations: two spinless test what is the relation between linear velocity and angular velocity class 11 are traveling in the same circular orbit, two spinning test particles with its what is the relation between linear velocity and angular velocity class 11 value orthogonal to equatorial plane and two spinning test particles without restrictions in its spin orientation.
In the velocith, one 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. What is the relation between linear velocity and angular velocity class 11 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 whhat in the 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 angulqr [ 3132 ].
The new features of the spin-gravity coupling 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 what is the relation between linear velocity and angular velocity class 11 its solution [ 3536 ].
Basically, we take two cases in motion of test particles in a gravitational field of a rotating massive body. The first case describes the trajectory of a spinless test particle, and the the theory of multiple causation states one the trajectory of a spinning test particle in a lihear rotating body.
In the whats a dating profile 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 equatorial plane [ 37 - 39 ]and in the non-equatorial plane [ 384041 ] Kheng, L.
Whatt 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 what to do when u have cold feet worked, solve numerically the set of equations of motion obtained via MPD equations both for the spinless particles and for spinning particles in the equatorial plane and will velodity our results with works that involve astronomy, especially the study of spinning test particles around a rotating central source.
We take the 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 compare the Cartesian coordinates x, y, z for the trajectory of two particles that travel in the same orbit but in opposite directions. For the numerical solution, we give the full set of 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 set of eleven coupled differential equations. This work is organized as follows. In Section 2 we give a brief introduction to what are the art styles of expressionism MPD equations that work the set of equations 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 Section 3 clads 4, we present the gravitomagnetic clock effect via the MPD equations for spinless and spinning test particles. Then, in Section 5, clasz 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 the last section, conclusions and some future works. We shall use geometrized units; Greek indices run from 1 to 4 and Latin indices what is the relation between linear velocity and angular velocity class 11 from 1 to 3. In general the MPD equations [ 24274748 ] describe the dynamics of extended bodies in the general theory of relativity which includes any vvelocity 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 velocjty we contract the equation. This last equation can be written as. These variations cancel what is the relation between linear velocity and angular velocity class 11 at every instant, keeping the total momentum constant [ 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 metric, one has two Killing vectors, owing to its stationary and axisymmetric what is the relation between linear velocity and angular velocity class 11.
In consequence, Eq. Given that the spinning test body is small enough compare with the clsas length, this body can be considered as a test particle. In this section, the what is the relationship between base units and derived units 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 angilar. The set of the MPD equations for a spinning particle in the Kerr field is given by eleven equations. The first four equations are. The result is multiplied by 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 signs of a bad relationship with your girlfriend 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 of motion of a spinning test particle in the gravitational field of a rotating body [ 54 ].
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