HETDEX survey for dark energy effects

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notFritzArgelander
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HETDEX survey for dark energy effects

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Post by notFritzArgelander »

Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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Re: HETDEX survey for dark energy effects

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Post by helicon »

While other studies measure the universe's expansion using distant supernovae or a phenomenon known as gravitational lensing, where light is bent by the gravity of massive objects such as galaxies and black holes, HETDEX is focused on sound waves from the big bang, called baryonic acoustic oscillations. Although we can't actually hear sounds in the vacuum of space, astronomers can see the effect of these primordial sound waves in the distribution of matter throughout the universe.
Hope this sheds more light on the dark energy enigma, so to speak.
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Re: HETDEX survey for dark energy effects

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Post by turboscrew »

Funny, that I haven't thought it before, but when they say that the universe is expanding, does it mean "the whole" universe, the observable universe, or both?
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Re: HETDEX survey for dark energy effects

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Post by notFritzArgelander »

turboscrew wrote: Tue May 04, 2021 10:28 pm Funny, that I haven't thought it before, but when they say that the universe is expanding, does it mean "the whole" universe, the observable universe, or both?
Both actually. If it’s not both it runs afoul of Noether’s Theorem.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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