unphysical

See: intangible
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An existence of unphysical pressure fluctuations, which bring a numerical instability, is the most serious drawback of both SPH and MPS methods.
To understand the difficulty, consider the first step to processing a station: the raw meteorological data is screened for the presence of unphysical values, spikes and outliers, arising from sensor malfunction, unit conversion errors, or database corruption.
The base numerical method, being second order accurate, does not satisfy the stability requirements and therefore, in case of the simulation of pulsating flows or high-amplitude pressure perturbations, can give rise to unphysical spurious oscillations affecting the numerical solution.
Second, the results of smaller simulations cannot be scaled up to model larger clusters--the scaling inevitably leads to unphysical behavior.
Dr Anwar-ul-Hassan Gilani said that changing lifestyle, junk food and unphysical activities were causing obesity that can be called the root cause of the many diseases including diabetes and cardiovascular diseases.
The key ingredient of this new model is that the Veneziano ghost, which is unphysical in the usual Minkowski spacetime QFT, exhibits important physical effects in dynamical spacetime or spacetime with non-trivial topology.
The SU technique is introduced to ensure stability and avoid unphysical upstream propagation of disturbances.
d]) in the lower half plane (the second sheet or the unphysical plane).
If DE is a scalar field, this method would place constraints or exclude whole classes of theories without involving potentially unphysical parameterisations.
With stable poles and passivity enforced, the resulting equivalent circuit may still have unphysical circuit elements (negative resistance, capacitance and inductance), as shown in Table 3, even though we use low order of approximation.