TFW you got call out of your bullshit and can't think of a single counter argument so you just cope by calling the other side "yapping" and pretending you've defeated them in the argument.
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You're getting that reaction because the idea that a nuclear detonation is incomparable to core of the sun doesn't make much sense. The pressure I'll give you, sure. The nuke's about 1 million psi at its peak, whilst the sun's core is billions. But implying that a nuke's peak heat being 100 million °C doesn't mean really mean anything without it being sustained is too wild to take seriously for me. Just because it's short-lived, doesn't mean it's not blatantly more lethal. The heat from a nuclear detonation is short-lived specifically because, like all thermal energy, it pours itself into anything lacking the same level of energy as it. Being at the epicentre of a nuclear explosion just means all that thermal energy is rapidly going to turn the target from room temperature to also burning hotter than the sun and partially turned to plasma real fast. And for some monsters, it might not particularly matter to their molecules if their bodies are going to disperse a good chunk of that heat 1/10th of a microsecond later, because their molecules would have already found themselves lacking chemical bonds, a couple of sub-atomic particles for good measure, and blowing in the breeze of a false dawn by that point anyway.
This fact also means that without something increasing the thermal energy available to the system, the target isn't going to get any hotter than its environment. If the environment of the sun's core caps out at 15 million °C, then the target's only getting heated to 15 million °C no matter how long it stays in there. The target at nuclear ground zero, on the other hand, could cap out at around 100 million °C, however brief that may be. Maximal thermal damage for less kinetic damage, vs less thermal damage for beyond maximal kinetic damage.
Therefore, if something isn't getting killed by the nuke, the heat from the sun isn't doing them in either. The sun's crushing force near definitely could though, and in fact is probably the main reason why it's actually lethal at all to A ranks. They may have an extreme external resistance to heat, but only external. This dissonance between external thermal resistance and internal thermal vulnerability is displayed by the M125 Asura, which is A rank. It's empowered by primordial flames, and yet has thermally weak insides. Mere magma, which can get to around 1600°C, was enough to melt the flesh behind its exposed orifices, artificially created or not. As a consequence, it actually is reasonable to theorise that
certain A ranks would be capable of dying to sufficient nukes, and that the sun's ability to vaporise Level 5 bodies and dispose of A rank monsters might be evidence to support that. Then of course there's the Level 4s, which are supposed to be on par with A ranks. Me personally, after seeing her fighting for her life with A rank monsters, I don't think Doll Ella's tanking the nuclear and nuclear+ hits that big Ella is.
Also, since we're being pedantic here, figure 1 of the paper you cited says at 34 microseconds post-detonation in a range of 10m, the temperature's 9x10^5°K, or 0.89 million °C. If it's that hot at 34 microseconds, it's probably way over 1 million °C closer to 0.1 microseconds.