[QUOTE=chalsall;552709]Hawking radiation is similar, but different.[/QUOTE]

?

[QUOTE=ewmayer;552717]?[/QUOTE]

A huge over-simplifaction (subject to correct by those who actually understand this stuff)...

Drop your thinking down to Quantum. Introduce virtual-particles. Run the simulations.

The speed C can't be reached by most particles (although they can get darn close, and others are stuck at that speed).

So they'll bleed off energy when required.

(And Black Holes evaporate.)

[QUOTE=chalsall;552718]A huge over-simplifaction (subject to correct by those who actually understand this stuff)...

Drop your thinking down to Quantum. Introduce virtual-particles. Run the simulations.

The speed C can't be reached by most particles (although they can get darn close, and others are stuck at that speed).

So they'll bleed off energy when required.

(And Black Holes evaporate.)[/QUOTE]Re-?

[QUOTE=xilman;552721]Re-?[/QUOTE]

42. What was the question again?

Lots of videos at that link (Beirut.) In some of them you see what I think must be chunks of concrete flying off the top of a building as the shock wave hits. Nearby highrise at the port appears to have no wall left on the facing side.

Grim stuff. Shades of [URL="https://en.wikipedia.org/wiki/Texas_City_disaster"]Texas City[/URL]. That was slightly less ammonium nitrate on board a ship in the harbor: 2300 tons NH[SUP]4[/SUP]NO[SUP]3[/SUP] was the trigger for many secondary explosions, since there were oil storage tanks and refineries flattened, and another ship loaded with NH[SUP]4[/SUP]NO[SUP]3[/SUP] which exploded a bit later.
[QUOTE]A mid-morning fire started on board the [URL="https://en.wikipedia.org/wiki/France"]French[/URL]-registered vessel SS [I]Grandcamp[/I] (docked in the port) and detonated her cargo of about 2,300 [URL="https://en.wikipedia.org/wiki/Ton"]tons[/URL] (about 2,086 [URL="https://en.wikipedia.org/wiki/Tonne"]metric tons[/URL]) of [URL="https://en.wikipedia.org/wiki/Ammonium_nitrate"]ammonium nitrate[/URL].[URL="https://en.wikipedia.org/wiki/Texas_City_disaster#cite_note-fire_report-1"][1][/URL] This started a [URL="https://en.wikipedia.org/wiki/Chain_reaction"]chain reaction[/URL] of fires and explosions in other ships and nearby [URL="https://en.wikipedia.org/wiki/Oil_depot"]oil-storage facilities[/URL], ultimately killing at least 581 people, including all but one member of the Texas City fire department.[/QUOTE]

[QUOTE=chalsall;552725]42. What was the question again?[/QUOTE]What features of quantum electrodynamics leads you to the conclusion that Čerenkov radiation is similar to Hawking radiation?

Restricting attention solely to photons, Hawking radiation is emitted isotropically and with a thermal spectral distribution. Čerenkov is highly non-thermal and very anisotropic.

The Hawking process produces massive and mass-less particles. The Čerenkov process only mass-less ones.

Those are just a couple of examples which spring instantly to mind.

Shockwave videos of all sorts: [URL]http://old.reddit.com/r/shockwaveporn[/URL]

[QUOTE=xilman;552750]What features of quantum electrodynamics leads you to the conclusion that Čerenkov radiation is similar to Hawking radiation?[/QUOTE]

They both have the word "radiation" in them? :wink:

You are of course aware that I only have a meta understanding of the Quantum domain.

I can't hold a candle to folks like you (sincerely). :smile:

With those many views and many structures, there will be much data for blast propagation and building techniques and materials. The shadow of the granary in the shockwave is interesting.

I stole this from the megaporn link above. This is (supposedly) a picture of the warehouse with the door open, with the chemical culprit in full view.

[QUOTE=PhilF;552797]I stole this from the megaporn link above. This is (supposedly) a picture of the warehouse with the door open, with the chemical culprit in full view.[/QUOTE]

The Moon of Alabama article I linked to featured the same pic - and all those thousands of tons of this stuff were sitting there for over 6 *years*, just waiting for a suitable heat source, a welder's spark, a dropped still-lit cigarette remnant, what have you.