River model of a charged (Reissner-Nordström) Black Hole
Same Gullstrand-Painlevé (1921) metric
d
s
2
=
-
d
t
ff
2
+ (
d
r
+
b
d
t
ff
)
2
+
r
2
(
d
q
2
+ sin
2
q
d
f
2
)
with
b
º
[ 2
G
M
(
r
) /
r
]
1/2
, interior mass
M
(
r
) =
M
-
Q
²/2
r
Penrose diagram of a charged (Reissner-Nordström) Black Hole