Talk Title and Abstract:
RELIKE
-
Reionization
Effective
Likelihood
from
Planck
Legacy
Data
The
Planck
legacy
data
is
currently
the
best
full-sky
measurement
on
the
cosmic
microwave
background.
To
fully
take
advantage
of
its
superb
measurement
on
large-scale
CMB
polarization
for
constraining
reionization,
we
build
and
release
RELIKE
—
a
fast
and
accurate
effective
likelihood
code,
using
the
technique
of
reionization
principal
components.
With
this
code
release
(https://github.com/chenheinrich/RELIKE),
one
can
now
quickly
test
the
likelihood
of
any
reionization
model
between
redshifts
6
<
z
<
30
in
just
a
few
lines
of
python
code.
Instead
of
using
the
optical
depth
constraint
obtained
from
an
instantaneous
reionization
model,
RELIKE
now
enables
a
fast
and
consistent
way
of
combining
Planck
constraints
with
other
reionization
data
sets
for
which
the
ionization
evolution
is
important
(e.g.
line-intensity
mapping,
luminosity
function,
star
formation
history,
quasar
spectra).
In
the
second
part
of
the
talk,
I
will
also
give
a
brief
update
on
ongoing
work
in
the
SPHEREx
mission.
SPHEREx
aims
to
measure
primordial
non-Gaussianities
with
unprecedented
precision
(sigma(fNL)
~
1)
to
determine
a
key
property
of
inflation.
To
achieve
this
precision,
accurate
modeling
of
the
power
spectrum
and
bispectrum
are
needed.
I
will
describe
ongoing
work
(and
challenges)
that
we
face
in
this
area
as
we
prepare
for
the
first
time
full-sky
measurement
of
large-scale
structure
with
SPHEREx.
Would you like to join this Zoom seminar? Please email WCA.