Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Luminosity Bias (II): The Cosmic Web of the First Stars   Understanding the formation and evolution of the first stars and galaxies
represents one of the most exciting frontiers in astronomy. Since the universe
was filled with neutral hydrogen at early times, the most promising method for
observing the epoch of the first stars is using the prominent 21-cm spectral
line of the hydrogen atom. Current observational efforts are focused on the
reionization era (cosmic age t ~ 500 Myr), with earlier times considered much
more challenging. However, the next frontier of even earlier galaxy formation
(t ~ 200 Myr) is emerging as a promising observational target. This is made
possible by a recently noticed effect of a significant relative velocity
between the baryons and dark matter at early times. The velocity difference
suppresses star formation, causing a unique form of early luminosity bias. The
spatial variation of this suppression enhances large-scale clustering and
produces a prominent cosmic web on 100 comoving Mpc scales in the 21-cm
intensity distribution. This structure makes it much more feasible for radio
astronomers to detect these early stars, and should drive a new focus on this
era, which is rich with little-explored astrophysics.

34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
16
The categories of this paper are: stat
1
The categories of this paper are: cs