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About Varied / Hobbyist DarkSapiensMale/Spain Recent Activity
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Primordial Black Holes :icondarksapiens:DarkSapiens 4 5 Rebels Fleet :icondarksapiens:DarkSapiens 20 0 Gravitational lens system :icondarksapiens:DarkSapiens 2 0 Quasar Accretion Disk :icondarksapiens:DarkSapiens 5 3 Active Galactic Nucleus :icondarksapiens:DarkSapiens 2 5 Arwende Luhtiene :icondarksapiens:DarkSapiens 1 2 Kazellis light freighter :icondarksapiens:DarkSapiens 3 3 Dinosaurs :icondarksapiens:DarkSapiens 1 0 Redemption scenario :icondarksapiens:DarkSapiens 8 3 TIE Defender, 'The Force Awakens' style :icondarksapiens:DarkSapiens 20 10 Terraformed Moon :icondarksapiens:DarkSapiens 3 0 Star Wars X-Wing: Rescue Sullustan tech staff :icondarksapiens:DarkSapiens 13 2 E-wings vs TIE Droids :icondarksapiens:DarkSapiens 9 2 Falling star :icondarksapiens:DarkSapiens 3 0 Vader helmet :icondarksapiens:DarkSapiens 0 0 Ship concept / TIE Interceptor / B-wing :icondarksapiens:DarkSapiens 0 0

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Star Destroyer - Tatooine Atmosphere :iconbb22andy:BB22Andy 156 10 Star Destroyer - Crash on Malachor :iconbb22andy:BB22Andy 256 11 Twilight of the Apprentice :iconvarjopihlaja:Varjopihlaja 485 82 Delta Squadron Defender x7 :iconcitrus7:Citrus7 9 7 I'm no one :iconroberthendrickson:roberthendrickson 218 12 Jakku Smuggler :iconr-valle:R-Valle 86 1 Breaking Point :iconmirrorandimage:MirrorandImage 27 18 On the bridge of woe in mantle wrapped she sang :iconarwendeluhtiene:ArwendeLuhtiene 15 6 Noldorin Elf cosplay in Rivendell I :iconarwendeluhtiene:ArwendeLuhtiene 13 8 The Padawan :iconstudioofmm:studioofmm 228 26 A New Hope :iconcallyste:Callyste 347 63 Admiral Ackbar - Star Wars :iconstuponitron:stuponitron 57 7 Rogue 3 :iconjoelhustak:joelhustak 437 36 Haleth -sketch :iconekukanova:EKukanova 542 62 The Swan-Maiden of Alqualonde :iconekukanova:EKukanova 649 81 The-Trenches :iconjeffleejohnson:JeffLeeJohnson 139 7

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Primordial Black Holes
Artistic representation of black holes in the halo of a spiral galaxy.

When gravitational waves were first detected at the LIGO interferometer, right after switching it on, the fact that they were produced in a collision of two black holes of about 30 solar masses each was surprising for scientists. It is uncommon for black holes formed by supernovae to be that big, because then the stars that exploded must have had large masses that only happen on very rare occasions and under special circumstances (the material that forms the star must have been almost only hydrogen and helium and barely anything else). However, the fact that they were detected so early suggested to some that these massive black holes might be more common than previously thought.

But there are some theories that predict that large numbers of black holes would have been created in regions of high density very soon after the big bang, and many would remain today. Some even proposed that these "primordial black holes" could be what dark matter is made of. And if there are so many as to be the main component of dark matter and they had this range of mass, they would explain the gravitational wave observation.

However, if millions of black holes are surrounding every galaxy, perhaps we could detect them with gravitational lensing, as their mass deflects light coming from a bright object further away. I recently participated in a study to do just that, and we concluded that these black holes cannot form a significant fraction of the dark matter or there would be gravitational lensing effects that we don't see. The study was accepted by The Astrophysical Journal Letters, and it can be read here: arxiv.org/abs/1702.00947

Yesterday, a Spanish science popularizer specialized on Physics decided to write about it, and suggested that it would be good to have a good illustration to accompany the text. So I made this piece :)
Here is his post, in Spanish: francis.naukas.com/2017/02/10/…

The image was created using Cinema 4D, and a technique I developed about 9 years ago to make this video of a black hole in front of a planet: www.youtube.com/watch?v=grTczB…
The background galaxy is a picture of M81 by the Hubble Space Telescope, available here under the Creative Commons Attribution 4.0 International license.
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Rebels Fleet
The new Star Wars Rebels mid-season trailer got me inspired! (Beware spoilers!) www.youtube.com/watch?v=upN-7A…

The Rebels are finally starting to combine forces from different cells, gathering fleets of considerable strength. Here I decided to do a quick render showing a Nebulon-B frigate and some Corellian corvettes and A-wings from Phoenix Squadron, plus a couple of transports and Y-wings in the background. There's a similar shot in the trailer but a Dornean gunship is also present, so since I wouldn't be able to create an exact replica, I added the starfighters for good measure :)

Created in Cinema 4D R11.5
A-wings by Jose Gonzalez, Matt Walton & Matt Allen
Nebulon-B Frigate by Sean Kennedy
Corellian Corvettes by Tom Sehenuk & Fabio Passaro
Y-wings by Al Meerow
Rebel Transports by Sean Kennedy & André Müller
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Gravitational lens system
Artistic representation of the phenomenon I studied during my PhD thesis. A quasar (left) emits light that gets deflected by a galaxy acting as gravitational lens (center, orange), making us see four images of the quasar when we observe the system (right).

The image on the right is our actual data from mid-infrared observations, described in the following paper: adsabs.harvard.edu/abs/2016ApJ…

Cosmological simulations show that part of the dark matter in the halo of the lens galaxy should be concentrated in subhaloes (that I illustrated in gray), but in numbers far higher than the amount of satellites observed in nearby galaxies. This is important because they either do not exist and our dark matter theories require refinements, or they are there but do not contain stars that would make them luminous. The gravity of these subhaloes has an effect in the fluxes we observe in the multiple images of the lensed quasar, and we can use gravitational lensing to detect their presence.
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DarkSapiens
DarkSapiens
Artist | Hobbyist | Varied
Spain
Astrophysicist

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:iconmirrorandimage:
MirrorandImage Featured By Owner Feb 13, 2017  Professional Digital Artist
Thanks for the :+fav:!
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:icondarksapiens:
DarkSapiens Featured By Owner Feb 16, 2017  Hobbyist General Artist
Thank you for your dedication and effort when creating your art! :) :)
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:iconlittlesnaketail:
LittleSnaketail Featured By Owner Feb 11, 2017  Hobbyist General Artist
Thanks for the watch!
Are you really an astrophysicist? Because that's awesome!
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:icondarksapiens:
DarkSapiens Featured By Owner Feb 11, 2017  Hobbyist General Artist
You're welcome! I really liked the art in your gallery :)

And yes, I am! :D
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:iconnomidarklighter:
NomiDarklighter Featured By Owner Jul 24, 2016  Hobbyist General Artist
Thank you for the watch. It means a lot for me.
Btw Impressive gallery. I like your spacecrafts, because I constantly fail to draw something like this. :D (Big Grin) 
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:icondarksapiens:
DarkSapiens Featured By Owner Jul 25, 2016  Hobbyist General Artist
You're very welcome! I really like your art, wanted to see more, so watch it is! :D

And thanks a lot! I used to be able to draw spacecrafts only and not people, so my problem was the opposite, haha XD
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:iconnomidarklighter:
NomiDarklighter Featured By Owner Jul 25, 2016  Hobbyist General Artist
I've wanted to draw the uncoming X-wings over the lake on Takodana, but I've failed. I like this scene, along with the music, very much.
Maybe sometimes I will be able to draw spacecrafts.
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:icondarksapiens:
DarkSapiens Featured By Owner Jul 26, 2016  Hobbyist General Artist
Hm, that scene might be tricky, yes… I'll have to try it one day :)
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(1 Reply)
:iconjesse220:
Jesse220 Featured By Owner Mar 27, 2016
Happy Birthday and Happy Easter
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:icondarksapiens:
DarkSapiens Featured By Owner Mar 27, 2016  Hobbyist General Artist
Thank you! :D
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