Assessing theoretical uncertainties for cosmological constraints from weak lensing surveys

$ $W e a k g r a v i t a t i o n a l l e n s i n g i s a p o w e r f u l p r o b e w h i c h i s u s e d t o c o n s t r a i n t h e s t a n d a r d c o s m o l o g i c a l m o d e l a n d i t s e x t e n s i o n s . W i t h t h e e n h a n c e d s t a t i s t i c a l p r e c i s i o n o f c u r r e n t a n d u p c o m i n g s u r v e y s, h i g h a c c u r a c y p r e d i c t i o n s f o r w e a k l e n s i n g s t a t i s t i c s a r e n e e d e d t o l i m i t t h e i m p a c t o f t h e o r e t i c a l u n c e r t a i n t i e s o n c o s m o l o g i c a l p a r a m e t e r c o n s t r a i n t s . F o r t h i s p u r p o s e, w e p r e s e n t a c o m p a r i s o n o f t h e t h e o r e t i c a l p r e d i c t i o n s f o r t h e n o n l i n e a r m a t t e r a n d w e a k l e n s i n g p o w e r s p e c t r a, b a s e d o n t h e w i d e l y u s e d f i t t i n g f u n c t i o n s ($ $mead$ $a n d$ $rev-halofit$ $), e m u l a t o r s ($ $EuclidEmulator$ $,$ $EuclidEmulator2$ $,$ $BaccoEmulator$ $a n d$ $CosmicEmulator$ $) a n d N - b o d y s i m u l a t i o n s ($ $Pkdgrav3$ $) . W e c o n s i d e r t h e f o r e c a s t e d c o n s t r a i n t s o n t h e$ Λ $CDM$ $a n d$ $wCDM$ $m o d e l s f r o m w e a k l e n s i n g f o r s t a g e I I I a n d s t a g e I V s u r v e y s . W e s t u d y t h e r e l a t i v e b i a s o n t h e c o n s t r a i n t s a n d t h e i r d e p e n d e n c e o n t h e a s s u m e d p r e s c r i p t i o n s . A s s u m i n g a$ Λ $CDM$ $c o s m o l o g y, w e f i n d t h a t t h e r e l a t i v e a g r e e m e n t o n t h e$ S_8 $p a r a m e t e r i s b e t w e e n$ 0.2-0.3σ $f o r a s t a g e I I I - l i k e s u r v e y b e t w e e n t h e a b o v e p r e d i c t o r s . F o r a s t a g e I V - l i k e s u r v e y t h e a g r e e m e n t b e c o m e s$ 1.4-3.0σ $. I n t h e$ $wCDM$ $s c e n a r i o, w e f i n d b r o a d e r$ S_8 $c o n s t r a i n t s, a n d a g r e e m e n t s o f$ 0.18-0.26σ $a n d$ 0.7-1.7σ $f o r s t a g e I I I a n d s t a g e I V s u r v e y s, r e s p e c t i v e l y . T h e a c c u r a c i e s o f t h e a b o v e p r e d i c t o r s t h e r e f o r e a p p e a r a d e q u a t e f o r s t a g e I I I s u r v e y s, w h i l e t h e f i t t i n g f u n c t i o n s w o u l d n e e d i m p r o v e m e n t s f o r f u t u r e s t a g e I V w e a k l e n s i n g s u r v e y s . F u r t h e r m o r e, w e f i n d t h a t, o f t h e f i t t i n g f u n c t i o n s,$ $mead$ $ provides the best agreement with the emulators. We discuss the implication of these findings for the preparation of the future weak lensing surveys.

文献摘要

W e a k g r a v i t a t i o n a l l e n s i n g i s a p o w e r f u l p r o b e w h i c h i s u s e d t o c o n s t r a i n t h e s t a n d a r d c o s m o l o g i c a l m o d e l a n d i t s e x t e n s i o n s . W i t h t h e e n h a n c e d s t a t i s t i c a l p r e c i s i o n o f c u r r e n t a n d u p c o m i n g s u r v e y s, h i g h a c c u r a c y p r e d i c t i o n s f o r w e a k l e n s i n g s t a t i s t i c s a r e n e e d e d t o l i m i t t h e i m p a c t o f t h e o r e t i c a l u n c e r t a i n t i e s o n c o s m o l o g i c a l p a r a m e t e r c o n s t r a i n t s . F o r t h i s p u r p o s e, w e p r e s e n t a c o m p a r i s o n o f t h e t h e o r e t i c a l p r e d i c t i o n s f o r t h e n o n l i n e a r m a t t e r a n d w e a k l e n s i n g p o w e r s p e c t r a, b a s e d o n t h e w i d e l y u s e d f i t t i n g f u n c t i o n s (

Assessing theoretical uncertainties for cosmological constraints from weak lensing surveys

文献摘要

讨论

讲解博客

AI智能校验

Assessing theoretical uncertainties for cosmological constraints from weak lensing surveys

文献摘要

讨论

讲解博客

AI智能校验

Assessing theoretical uncertainties for cosmological constraints from weak lensing surveys

文献摘要

讨论

|讲解博客

|AI智能校验

Assessing theoretical uncertainties for cosmological constraints from weak lensing surveys

文献摘要

讨论

|讲解博客

|AI智能校验

讲解博客

AI智能校验

讲解博客

AI智能校验