Package aloha :: Module aloha_lib

Module aloha_lib

This module develop basic structure for the symbolic treatment of the Helas Amplitude.

The Symbolic treatment are based on a series of (scalar) variable of the form a * x. 'a' is a (complex) number and x is an abstract variable. Those variable can be multiply/add to each other and will then create a list of those variable in 'MultVariable','AddVariable'.

As We will work on two different level, we have two concrete representation of Variable:

'ScalarVariable' in order to represent a number (mass, component of impulsion,...
'LorentzObject' in order to store HighLevel object with lorentz/spin indices (as Gamma, Impulsion,...)

In order to pass from HighLevel Object (deriving from LorentzObject) to concrete definition based on ScalarVariable, we define a new class 'LorentzObjectRepresentation'

Each class defines the attribute "typevar" which is unique, this fastenize the type recognition of the object.

Classes

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FracVariable
A representation of a fraction.

AddVariable
A list of Variable/ConstantObject/...

MultVariable
A list of Variable with multiplication as operator between themselves.

Variable
This is the standard object for all the variable linked to expression.

ScalarVariable
A concrete symbolic scalar variable

MultLorentz
Specific class for LorentzObject Multiplication

LorentzObject
A symbolic Object for All Helas object.

IndicesIterator
Class needed for the iterator

LorentzObjectRepresentation
A concrete representation of the LorentzObject.

ConstantObject

Variables

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precision_cut = 1e-14

USE_TAG = set([])

depth = -1

__package__ = 'aloha'