Accurate astrophysics. Correct cosmology.

An international meeting in London, 13—16 July 2015.

Progress in cosmology increasingly requires a strong quantitative handle on astrophysical contaminants. Equally, many astrophysically interesting processes can be constrained from cosmological survey data. This meeting brought together experts in a range of fields to take a critical look at the relationship between accurate astrophysics and correct cosmology.

Thanks to all the speakers, presenters and participants who made the meeting a success. The schedule for the week is posted below. This site will remain online with slides from the presentations. Participant logistical information is archived in our welcome pack. (See also our code of conduct.)

The group photo is now available, and Renée Hložek summarised the meeting on storify.

Monday

09:30

Registration at Royal Astronomical Society, Piccadilly. See pack for directions.

10:00

Welcome from Nick Brook,
Dean of Mathematical and Physical Sciences, University College London [pdf]

Large scale structure

10:00 – 12:30 Session chair Ofer Lahav

10:15

Licia Verde

From precision cosmology to accurate cosmology [pdf]

10:45

Elise Jennings

Precision tests of dark energy: modelling large scale structure dynamics & parameter estimation [pdf]

11:00

Tea/coffee break

11:30

Mark Cropper

The Euclid Mission: accuracy and precision [ppt]

12:00

Dragan Huterer

Growth of structure: the next frontier [pdf]

12:30

Lunch break

14:00 - 15:15 Session chair Hiranya Peiris

14:00

Risa Wechsler

Accurate Modeling of Galaxies for Precision Cosmology from Galaxy Surveys

14:30

Anže Slosar

Latest results from the BOSS experiment [pdf]

14:45

Raul Angulo

A new way of exploiting future cosmological measurements [pdf]

15:00

Darren DePoy

Spectrophotometric calibration techniques [pdf]

15:15

Poster session (all topics) ; chair Lorne Whiteway [pdf]

15:40

Tea/coffee break

16:15 - 17:00 Session chair Licia Verde

16:15

Wildcard talk:
Cristóbal Sifón

Satellite galaxy-galaxy lensing [pdf]

16:30

Structured discussion
Leaders Bob Nichol & Licia Verde

17:00

End

Tuesday

09:30

RAS opens

Cosmic microwave background

09:45 – 11:00 Session chair Hiranya Peiris

09:45

Renée Hložek

Constraining primordial models and astrophysical processes with CMB measurements: increasing both accuracy and precision. [pdf]

10:15

Niels Oppermann

Bayesian CMB foreground separation with a correlated log-normal model [pdf]

10:30

Clive Dickinson

CMB foregrounds – just how bad are they? [pdf]

11:00

Tea/coffee break

11:30 – 12:30 Session chair Renée Hložek

11:30

Céline Combet

Foreground-related systematic effects in the Planck-HFI polarisation data

SZ, clusters, dark matter and astrophysics

11:45

Alireza Hojjati

Weak lensing, thermal SZ effect and baryons [pdf]

12:00

Bruno Moraes

The thermal SZ emission of SDSS DR8 redmapper galaxy clusters

12:15

Stefano Ettori

The mass in galaxy clusters from X-ray/SZ observables [pdf]

12:30

Jorg Dietrich

Constraining the mass-YX scaling relation and its evolution using weak-lensing observations of high-mass clusters discovered by SPT [pdf]

12:45

Lunch break

14:00 – 15:30 Session chair Carlos Frenk

14:00

Tesla Jeltema

Calibrating the cluster richness-mass relation for the dark energy survey [ppt]

14:15

Mario Bonamigo

Triaxial galaxy clusters: simulating measurements and measuring simulations [pdf]

14:30

Tracy Slatyer

Evidence for unresolved point sources in the GeV gamma-ray excess [pdf]

15:00

Elena Pierpaoli

Revealing the nature of dark matter with multi-wavelength observations of the Galactic centre [ppt]

15:30

Tea/coffee break

16:00 – 17:15 Session chair Dragan Huterer

16:00

Nina Roth

Genetically modified galaxy formation [pdf]

16:15

Carlos Frenk

Is CDM ruled out?

16:45

Structured discussion
Leaders Dragan Huterer & Hiranya Peiris

17:15

End of scientific sessions

At 7pm, we are running a public session at the Royal Institution (directions in the participant pack). If you have chosen to attend this event, you should have received a ticket with your welcome pack. It’s essential to bring this with you as this event is open to the public and the door staff will only let in people with a ticket.

Wednesday

09:30

RAS opens

21cm, neutral hydrogen and reionization

09:45 – 11:00 Session chair Jonathan Pritchard

09:45

Benedetta Ciardi

Prospects for LOFAR detections [pdf]

10:15

Dijana Vrbanec

21cm—galaxy cross-power spectrum – can we observe it with LOFAR and Subaru’s Hyper Suprime-Cam? [pdf]

10:30

Michael Walther

Constraints on the IGM thermal history from the line-of-sight power spectrum of the Lyman-alpha forest [pdf]

10:45

Girish Kulkarni

Accurate 21cm signal forecasts from high dynamical range simulations of inhomogeneous reionization [pdf]

11:00

Tea/coffee break

11:30 – 12:30 Session chair Benedetta Ciardi

11:30

Matt McQuinn

21cm cosmology and reionization [pdf]

12:00

Laura Wolz

Intensity mapping cross-correlations: connecting the largest scales to galaxy evolution [pdf]

12:15

Mathieu Remazeilles

Astrophysical foregrounds and component separation in 21cm observations [pdf]

12:30

Lunch break

Lensing (Part I)

14:00 – 17:00 Session chair Benjamin Joachimi

14:00

Henk Hoekstra

Can we do correct cosmology with weak lensing? [pdf]

14:30

Massimo Viola

Properties of GAMA galaxies and groups from a lensing analysis of the KIDS survey [pdf]

14:45

Josh Meyers

Impact of chromatic PSF effects on weak lensing [pdf]

15:00

Hendrik Hildebrandt

RCSLenS – a 1000 sq. degree weak lensing survey – early science and astrophysical systematics [pdf]

15:30

Tea/coffee break

16:00

Ken Osato

Impact of baryonic processes on weak lensing higher-order statistics and parameter bias [pdf]

16:15

Elisa Chisari

Intrinsic alignments and CMB lensing [pdf]

16:30

Structured discussion
Leaders Gary Bernstein & Elena Pierpaoli

17:00

End of scientific sessions

The conference dinner will be held at 7pm at the Royal Institution. The location is marked on the map in the participant pack. Please also refer to the pack’s information about seating.

Thursday

09:30

RAS opens

Supernovae

09:45 – 11:00 Session chair Mark Sullivan

09:45

Adam Riess

Expansion of the Universe seen by Hubble

10:15

Mickael Rigault

Environmental dependencies in type IA supernovae distances and their effect on measurements of the Hubble constant [pdf]

10:30

Michelle Lochner

Supernova classification with machine learning [pdf]

10:45

Ed Macaulay

Insights from supernovae lensing [pdf]

11:00

Tea/coffee break

11:30 – 12:30 Session chair Michelle Lochner

11:30

Mark Sullivan

The impact of astrophysics on supernova cosmology [pdf]

12:00

Bob Nichol

New supernova cosmology [pdf]

12:30

Lunch break

14:00 – 15:30 Session chair Tom Kitching

14:00

Roberto Trotta

Bayesian hierarchical models for SN1A cosmology [pdf]

Lensing (Part II)

14:15

Frederic Courbin

Constraining cosmology with quasar time delays [pdf]

14:30

Adriano Agnello

Time-delay cosmography with STRIDES

14:45

Thomas Collett

Strong lensing tomography: probing w with multiple source-plane strong lenses [pdf]

15:00

Jonathan Blazek

The intrinsic alignment of galaxies and precision weak lensing [pdf]

15:15

David Kirkby

Olber’s paradox revisited: effects of overlapping sources on cosmic shear estimation [pdf]

15:30

Tea/coffee break

16:00

Gary Bernstein

Accurate measurements for accurate cosmology [pdf]

16:30

Tom Kitching

Current cosmic shear cosmology is either not accurate or not correct [pdf]

16:45

Structured discussion
Leaders Patricia Burchat & Adam Riess

17:15

End of conference

Organizing committee

  • Richard Ellis (scientific coordinator)
  • Andrew Pontzen (local & scientific coordinator)
  • Hiranya Peiris
  • Benjamin Joachimi
  • Ofer Lahav