Black holes with hair represented by generic fields surrounding the central source of the vacuum Schwarzschild metric are examined under the minimal set of requirements consisting of (i) the existence of a well defined event horizon, namely, we require the Killing horizon coincides with the causal horizon and (ii) the strong or dominant energy condition for the hair outside the horizon. We develop our analysis by means of the gravitational decoupling approach. We find that trivial deformations of the seed Schwarzschild vacuum preserve the energy conditions and provide a new mechanism to evade the no-hair theorem based on a primary hair associated with the charge generating these transformations. Under the above conditions (i) and (ii), this charge consistently increases the entropy from the minimum value given by the Schwarzschild geometry. As a direct application, we find a non-trivial extension of the Reissner–Nordström black hole showing a surprisingly simple horizon. Finally, the non-linear electrodynamics generating this new solution is fully specified.

由围绕真空Schwarzschild指标的中心源的通用字段表示的黑洞毛发在包括（i）存在明确定义的事件范围的最低要求下进行了检查，即，我们要求Killing范围与因果关系一致（ii）地平线以外头发的强能量或支配能量条件。我们通过引力解耦方法进行分析。我们发现种子Schwarzschild真空的琐碎形变保留了能量条件，并提供了一种新的机制来逃避基于与产生这些转换的电荷相关的主毛的无毛定理。在上述条件（i）和（ii）中，此电荷始终使Schwarzschild几何形状给出的最小值的熵增加。作为直接的应用，我们发现Reissner–Nordström黑洞的非平凡扩展显示出令人惊讶的简单视界。最后，充分说明了产生这种新解的非线性电动力学。