# netket.operator.KineticEnergy¶

class netket.operator.KineticEnergy(hilbert, mass, dtype=None)

This is the kinetic energy operator (hbar = 1). The local value is given by: $$E_{kin} = -1/2 ( \sum_i \frac{1}{m_i} (\log(\psi))'^2 + (\log(\psi))'' )$$

Inheritance
__init__(hilbert, mass, dtype=None)[source]

Args: hilbert: The underlying Hilbert space on which the operator is defined mass: float if all masses are the same, list indicating the mass of each particle otherwise dtype: Data type of the matrix elements. Defaults to np.float64

Parameters
Attributes
H

Returns the Conjugate-Transposed operator

Return type

AbstractOperator

T

Returns the transposed operator

Return type

AbstractOperator

dtype
Return type

Any

hilbert

The hilbert space associated to this operator.

Return type

AbstractHilbert

is_hermitian
mass
size

The total number number of local degrees of freedom.

Return type

int

Methods
collect()

Returns a guranteed concrete instancce of an operator.

As some operations on operators return lazy wrapperes (such as transpose, hermitian conjugate…), this is used to obtain a guaranteed non-lazy operator.

Return type

AbstractOperator

conj(*, concrete=False)
Return type

AbstractOperator

conjugate(*, concrete=False)

Returns the complex-conjugate of this operator.

Parameters

concrete – if True returns a concrete operator and not a lazy wrapper

Return type

AbstractOperator

Returns

if concrete is not True, self or a lazy wrapper; the complex-conjugated operator otherwise

transpose(*, concrete=False)

Returns the transpose of this operator.

Parameters

concrete – if True returns a concrete operator and not a lazy wrapper

Return type

AbstractOperator

Returns

if concrete is not True, self or a lazy wrapper; the transposed operator otherwise