This tag is associated with 76 posts

Neutrinos from the Big Bang – in focus

Much like the Cosmic Microwave Background, the Cosmic Neutrino Background permeates our Universe and it could take us back to 1 second after the Big Bang. Today, we discuss the effect of the Sun on modulating the expected signal from the neutrino background.

Life, the Universe and Everything Explained

Why resort to complicated theories that involve mysterious, unknown forces and states of matter? The geocentric model of the Universe nicely explains 1st century C.E. data.

BICEP2 results: inflation and the tensor modes

BICEP2 results show a 5.3 sigma detection of gravitational waves from inflation’s imprint on the cosmic microwave background (CMB).

AGN Illustration

A New Galactic Yardstick

We can measure the expansion of the universe with velocities and distances of extragalactic objects. But measuring distances is tough! The authors of this paper have developed a new technique for measure the distances of AGN using the “echo” of light from heated dust.

New probes of cosmology: Doppler Lensing

What do the sizes of galaxies have to tell us about cosmology? Today, we discuss how the velocity of a galaxy can change its observed size and tell us about the properties of the Universe.

From nuisance to new science: gravitational lensing of supernovae

There might be more information in the Hubble diagram of supernovae than we first thought. Far away supernovae are subject to gravitational lensing and in the upcoming decades, they could be used to determine how much matter there is in the Universe and how it clusters.

Galaxy in a Bottle: Simulating Spiral Galaxy Formation

How do simulations of galaxy formation stack up against each other and against observations? Find out with the Aquila project, a comparo of many different codes in current use.

Constraining fine-structure constant variations using QSOs

From measurements of quasar spectra, we can determine whether or not the fine structure constant is really a constant.

Where is that galaxy pointing?

Gravitational lensing is the deflection of the trajectory of a photon by gravity, and it is a natural consequence of the theory of General Relativity. Lensing distorts the shapes and orientations of galaxies and in today’s post, we discuss a new method to reconstruct dark matter maps of our Universe using the position angles of galaxies.

Stuck in neutral: how did the Universe become reionized?

How quickly did the Universe become reionized? And how do we know? Find out with Hubble in today’s paper.

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