Propagator

Symbolica documentation for getting started, symbolic expressions, numerical evaluation, pattern matching, and APIs in Python and Rust.

`Propagator`

class Propagator

A particle propagator with symbolic numerator and denominator.

Propagator formulas are kept in their model representation so that diagram construction can combine them with interaction Lorentz structures.

Examples

from symbolica import S, E
from symbolica.community import hepkit as hep
model = hep.Model.standard_model()
propagator = model.propagators[0]
formula = propagator.numerator / propagator.denominator

Attributes

Name	Description
`denominator`	Return the symbolic propagator denominator.
`name`	Return the propagator name.
`numerator`	Return the symbolic propagator numerator.
`particle`	Return the name of the particle using this propagator.

`denominator`

Propagator.denominator: Expression

Return the symbolic propagator denominator.

Examples

Using the setup in the Propagator class example:

inverse_propagator = propagator.denominator

`name`

Propagator.name: builtins.str

Return the propagator name.

Examples

Using the setup in the Propagator class example:

propagators_by_name = {item.name: item for item in model.propagators}

`numerator`

Propagator.numerator: Expression

Return the symbolic propagator numerator.

Examples

Using the setup in the Propagator class example:

formula = propagator.numerator / propagator.denominator

`particle`

Propagator.particle: builtins.str

Return the name of the particle using this propagator.

Examples

Using the setup in the Propagator class example:

propagator = model.propagators[0]
particle = model.particle(propagator.particle)

Methods

Name	Description
`__repr__`	Summarize the defining data as well as the propagator name.
`_repr_html_`	Display the model member’s physical data and defining expressions.
`_repr_pretty_`	Write the complete text summary to an IPython pretty printer.

`repr`

Propagator.__repr__() -> builtins.str

Summarize the defining data as well as the propagator name.

Examples

Using the setup in the Propagator class example:

print(model.propagators[0])

`_repr_html_`

Propagator._repr_html_() -> builtins.str

Display the model member’s physical data and defining expressions.

Examples

Using the setup in the Propagator class example:

from IPython.display import display
display(propagator)

`_repr_pretty_`

Propagator._repr_pretty_(pretty: typing.Any, cycle: builtins.bool) -> None

Write the complete text summary to an IPython pretty printer.

Examples

Using the setup in the Propagator class example:

from IPython.lib.pretty import pretty
text = pretty(propagator)

Parameters

pretty (object) IPython pretty printer receiving the text.
cycle (bool) Whether the object occurs recursively in the current display.