Zachary Slepian

Zachary Slepian has written 24 posts for astrobites

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).

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.

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.

A classic paper: how did the largest scale structure in the Universe form?

A relatively detailed discussion of a classic paper in cosmology, which basically covers everything you might want to know about how structure forms in the Universe on the very largest scales.

Circling problems with our model of the Universe: what can groups of galaxies tell us about Lambda CDM?

Measurements of the circular velocities in groups of galaxies can test whether our current cosmology is correct.

A breathing star: one thing Kepler finds other than exoplanets!

Bet there’s one thing you didn’t know about Kepler: it also tells us a lot about stars! Today, we discuss a paper that uses Kepler data to detect a star’s pulsations; much like humans, stars “breathe”!

Seeing Galaxy formation before reionization: baryon-dark matter relative velocity helps!

Relative velocity in the early Universe between regular matter (baryons) and dark matter enhances an otherwise hard-to-detect signal and makes it likely we can look back even farther into the past.

Planck and the Hubble constant: how fast are things flying apart, and what does it mean?

A quick discussion of Planck’s new value of the Hubble constant, as part of our series on the Planck results.

Ram pressure stripping: a classic paper

A classic 1972 paper by Jim Gunn and J. Richard Gott, III describing the growth of clusters from primordial density perturbations and, most famously, the importance of ram pressure stripping in explaining the observed lack of spiral galaxies towards the center of clusters.

Super-simple supernovae: a simple model for Type Ia light curves

A simple analytical model for the light curves of Type Ia supernovae.

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