Last Updated：2025/12/06
(physics, cosmology, astronomy, astrophysics, quantum mechanics, relativity theory) A spacetime singularity with an event horizon on the order of a Planck length (~ 10⁻³⁵ metres), and a mass on the order of a Planck mass (~ 20 micrograms), whose only possible decay route is emitting a single photon of Hawking radiation of that rest mass as energy, but thus disallowed by quantum physics transition prohibition, which becomes stable and everlasting if it does not absorb anything.
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Planck relic
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Source Word
Planck relic
Noun
(physics,
cosmology,
astronomy,
astrophysics,
quantum
mechanics,
relativity
theory)
A
spacetime
singularity
with
an
event
horizon
on
the
order
of
a
Planck
length
(~
10⁻³⁵
metres),
and
a
mass
on
the
order
of
a
Planck
mass
(~
20
micrograms),
whose
only
possible
decay
route
is
emitting
a
single
photon
of
Hawking
radiation
of
that
rest
mass
as
energy,
but
thus
disallowed
by
quantum
physics
transition
prohibition,
which
becomes
stable
and
everlasting
if
it
does
not
absorb
anything.
Japanese Meaning
プランク遺物：Planck長さ（約10⁻³⁵メートル）のオーダーの事象の地平線と、Planck質量（約20マイクログラム）のオーダーの質量を有する時空の特異点。ホーキング放射により1つの光子を放出することでのみ崩壊が可能なはずであるが、量子物理学における遷移禁止によりその崩壊が抑制され、何も吸収しなければ安定かつ永続的な存在となる対象を指す。
Sense（1）
(physics,
cosmology,
astronomy,
astrophysics,
quantum
mechanics,
relativity
theory)
A
spacetime
singularity
with
an
event
horizon
on
the
order
of
a
Planck
length
(~
10⁻³⁵
metres),
and
a
mass
on
the
order
of
a
Planck
mass
(~
20
micrograms),
whose
only
possible
decay
route
is
emitting
a
single
photon
of
Hawking
radiation
of
that
rest
mass
as
energy,
but
thus
disallowed
by
quantum
physics
transition
prohibition,
which
becomes
stable
and
everlasting
if
it
does
not
absorb
anything.
（ plural ）
