Equation of motion in tensorial form (relativistic)

In summary, the conversation discusses solving a tensor differential equation for the relativistic motion of a particle with charge e and mass m, given 4-momentum and an electromagnetic field tensor. The initial condition is also provided. The equation is a set of 4 simultaneous linear first order ordinary differential equations in 4 unknowns. Further clarification is requested on how to solve such an equation.
  • #1
vidi
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Homework Statement


How does one solve the tensor differential equation for the relativistic motion of a partilcle of charge [itex]e[/itex] and mass [itex]m[/itex], with 4-momentum [itex]p^a[/itex] and electromagnetic field tensor [itex]F_{ab}[/itex] of a constant magetic field [itex]\vec B[/itex] perpendicular to the plane of motion. [tex]\frac{dp^a}{d\tau}=\frac{e}{m}F^a{}_bp^b[/tex]
?
Let the the initial condition be [tex]p^a=(E_0 ,\vec 0)[/tex]



Homework Equations


[tex]\frac{dp^a}{d\tau}=\frac{e}{m}F^a{}_bp^b[/tex]


The Attempt at a Solution


I can see that the differential equation resembles that of a SHM equation or a cosh, sinh one if it's a scalar equation. However, I don't know how to deal with a tensor equation. Could anyone please explain? Thank you.
 
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  • #2
This is a set of 4 simultaneous linear first order ordinary differential equations in 4 unknowns. Do you know how to solve such a set of equations?
 

1. What is the equation of motion in tensorial form (relativistic)?

The equation of motion in tensorial form is a mathematical expression that describes the motion of a particle in a relativistic framework. It takes into account the effects of special relativity, such as time dilation and length contraction.

2. How is the equation of motion in tensorial form derived?

The equation of motion in tensorial form is derived from the relativistic energy-momentum relation, which states that the energy and momentum of a particle are related by the equation E^2 = (pc)^2 + (mc^2)^2. By taking the derivative of this equation with respect to time, we can obtain the equation of motion in tensorial form.

3. What are the advantages of using tensor notation for the equation of motion?

Tensor notation allows us to express the equation of motion in a concise and elegant way, without the need for multiple equations. It also allows for a more intuitive understanding of the relativistic effects on motion, as tensors are mathematical objects that describe the relationships between different quantities.

4. How does the equation of motion in tensorial form differ from the classical Newton's second law of motion?

The equation of motion in tensorial form differs from Newton's second law in that it takes into account the effects of special relativity, whereas Newton's law only applies in non-relativistic situations. Additionally, the equation of motion in tensorial form is expressed in terms of tensors, while Newton's law uses vectors.

5. Can the equation of motion in tensorial form be applied to any type of motion?

Yes, the equation of motion in tensorial form is applicable to all types of motion, including translational, rotational, and oscillatory motion. It is a fundamental equation in the field of relativistic mechanics and is used to describe the motion of particles in a wide range of physical systems.

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