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VERSITET UNI - Aarhus Universitet

AARHUS

UNIVERSITET 31. OKTOBER 2012

Masters of the universe: The Aarhus

cosmology group

CHRISTIAN SCHULTZ

PHD DAY

UNI VERSITET


AARHUS

UNIVERSITET

WHAT IS COSMOLOGY?

› Study of the universe as

an ordered whole

› The cosmic soup of the

early universe

› The individual

components of the

universe

› …and pretty pictures!

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

2


AARHUS

UNIVERSITET

THE VERY EARLY UNIVERSE: BEYOND

THE STANDARD MODEL

› Inflation

›Leptogenesis

Beyond SM

particle physics

› Baryogenesis

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

3


AARHUS

UNIVERSITET

THE EARLY UNIVERSE

Particle physics

› Neutrino decoupling

Nuclear

physics

›Nucleosynthesis

›Cosmicmicrowave

background

Plasma

physics

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

4


AARHUS

UNIVERSITET

COMPONENTS OF THE UNIVERSE

› 95 percent of the

universe is exotic,

beyond the standard

model energy/matter

› Dark energy recently

started to dominate

› We are the 1 percent!

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

5


AARHUS

UNIVERSITET

THE EUCLID MISSION: PRETTY

PICTURES

› 1.2 m space telescope

› Main goal: Determine the

origin of the accelerated

expansion

› Large field: Measures

weak lensing and galaxy

clustering

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

6


AARHUS

UNIVERSITET

THE EUCLID MISSION

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

7


AARHUS

UNIVERSITET

THE AARHUS COSMOLOGY GROUP

› N-body simulations

› Neutrino physics

› Dark energy

› Weak gravitational

lensing

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

8


AARHUS

UNIVERSITET

WHO WE ARE

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

9


AARHUS

UNIVERSITET

MAIN SCIENTIFIC GOALS

› Accurate simulations of

the large scale structure

› Parameter prediction in

clustering dark energy

scenarios

› Neutrino constraints from

cosmology

› Euclid contributions

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

10


AARHUS

UNIVERSITET

N-BODY SIMULATIONS

› Perturbation theory

breaks down on small

scales and/or late times

› N-body: Naively N(N-1)

force computations

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

11


AARHUS

UNIVERSITET

N-BODY SIMULATIONS

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

12


AARHUS

UNIVERSITET

NEUTRINO PHYSICS

› Profound effect on

structure formation

› Good constraints from

cosmology (more than 3

species?)

› How are (sterile-)

neutrinos produced?

Sterile neutrino

oscillations

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

13


AARHUS

UNIVERSITET

DARK ENERGY

› Cosmological constant?

› Modified gravity?

› Misinterpretation of data?

› Clustering dark energy?

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

14


AARHUS

UNIVERSITET

WEAK GRAVITATIONAL LENSING

› Only sensitive to the total

matter fluctuations

› Precision cosmology

› Promising outlook

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

15


AARHUS

UNIVERSITET 31. OKTOBER 2012

QUESTIONS?

CHRISTIAN SCHULTZ

PHD DAY

UNI VERSITET


AARHUS

UNIVERSITET

BASIC FORMALISM

geometry

dynamics

› Friedmann equation

› Perturbations on an

isotropic and

homogenous

background

Masters of the universe

CHRISTIAN SCHULTZ

31. OKTOBER 2012

17

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