東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Forward Modeling in the Era of Cosmological Surveys.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Forward Modeling in the Era of Cosmological Surveys./
作者:	Hadzhiyska, Boryana Tsvetanova.
面頁冊數:	1 online resource (559 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
標題:	Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29209880click for full text (PQDT)
ISBN:	9798819382745

Forward Modeling in the Era of Cosmological Surveys.
Hadzhiyska, Boryana Tsvetanova.

Forward Modeling in the Era of Cosmological Surveys. - 1 online resource (559 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (Ph.D.)--Harvard University, 2022.

Includes bibliographical references

The distribution of matter on small scales is highly dependent on the exact composition of the Universe and as such, holds the key to the nature of many of its enigmatic ingredients such as dark energy, neutrinos, and dark matter. The ultimate constraints on these unknowns will likely come from multi-scale, multi-tracer approaches that encompass a wide range of probes and redshifts and are accurate at the subpercent level. This thesis offers a pioneering approach to using hydrodynamical (hydro) simulations to the advantage of large-scale structure surveys. While historically, hydro simulations have been insightful in unveiling the poorly understood processes of galaxy formation and evolution, only recently have they reached volumes that are relevant for cosmological analysis. We employ the state-of-the-art hydro simulations IllustrisTNG and the larger-yet MillenniumTNG to uncover discrepancies in commonly used galaxy-halo models, which if overlooked, would lead to serious biases in our cosmological inference. Putting these models to the test, we show that their current level of accuracy is inadequate in the context of the expected measurement precision of current and upcoming cosmological surveys. Augmenting them with an additional dependence on physical properties of the dark matter field alleviates the most major tensions. Since the volume and parameter variation of hydro simulations is still limited, before applying our knowledge to observations, we need to graft these models onto N-body (dark-matter-only) simulations. As part of the development team of the AbacusSummit N-body simulation suite, we create publicly available products such as a novel halo finding algorithm and halo light cone catalogs, designed expressly for analyzing large galaxy surveys such as the Dark Energy Spectroscopic Instrument (DESI).The final step of this process is placing the simulation analysis in the domain of observational analysis. We present applications of two novel numerical methods to photometric data in the final two chapters. The first is a hybrid effective field theory (HEFT) model, which combines a more traditional analytic approach with the exactness of N-body simulations, while the second offers an analytic marginalization over the uncertainties inherent to photometric redshifts. To conclude, we discuss future applications of the methods developed in this thesis to galaxy surveys such as DESI and Euclid and cosmic microwave background (CMB) experiments such as the Atacama Cosmology Telescope (ACT) and Planck.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798819382745Subjects--Topical Terms:

535904
Astrophysics.
Subjects--Index Terms:

AlgorithmsIndex Terms--Genre/Form:

542853
Electronic books.

Forward Modeling in the Era of Cosmological Surveys.
LDR:03946nmm a2200409K 4500 001 2357559
005 20230725053514.5
006 m o d
007 cr mn ---uuuuu
008 241011s2022 xx obm 000 0 eng d
020 $a 9798819382745
035 $a (MiAaPQ)AAI29209880
035 $a AAI29209880
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Hadzhiyska, Boryana Tsvetanova. $3 3698090
245 1 0 $a Forward Modeling in the Era of Cosmological Surveys.
264 0 $c 2022
300 $a 1 online resource (559 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
500 $a Advisor: Eisenstein, Daniel; Hernquist, Lars.
502 $a Thesis (Ph.D.)--Harvard University, 2022.
504 $a Includes bibliographical references
520 $a The distribution of matter on small scales is highly dependent on the exact composition of the Universe and as such, holds the key to the nature of many of its enigmatic ingredients such as dark energy, neutrinos, and dark matter. The ultimate constraints on these unknowns will likely come from multi-scale, multi-tracer approaches that encompass a wide range of probes and redshifts and are accurate at the subpercent level. This thesis offers a pioneering approach to using hydrodynamical (hydro) simulations to the advantage of large-scale structure surveys. While historically, hydro simulations have been insightful in unveiling the poorly understood processes of galaxy formation and evolution, only recently have they reached volumes that are relevant for cosmological analysis. We employ the state-of-the-art hydro simulations IllustrisTNG and the larger-yet MillenniumTNG to uncover discrepancies in commonly used galaxy-halo models, which if overlooked, would lead to serious biases in our cosmological inference. Putting these models to the test, we show that their current level of accuracy is inadequate in the context of the expected measurement precision of current and upcoming cosmological surveys. Augmenting them with an additional dependence on physical properties of the dark matter field alleviates the most major tensions. Since the volume and parameter variation of hydro simulations is still limited, before applying our knowledge to observations, we need to graft these models onto N-body (dark-matter-only) simulations. As part of the development team of the AbacusSummit N-body simulation suite, we create publicly available products such as a novel halo finding algorithm and halo light cone catalogs, designed expressly for analyzing large galaxy surveys such as the Dark Energy Spectroscopic Instrument (DESI).The final step of this process is placing the simulation analysis in the domain of observational analysis. We present applications of two novel numerical methods to photometric data in the final two chapters. The first is a hybrid effective field theory (HEFT) model, which combines a more traditional analytic approach with the exactness of N-body simulations, while the second offers an analytic marginalization over the uncertainties inherent to photometric redshifts. To conclude, we discuss future applications of the methods developed in this thesis to galaxy surveys such as DESI and Euclid and cosmic microwave background (CMB) experiments such as the Atacama Cosmology Telescope (ACT) and Planck.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Astrophysics. $3 535904
650 4 $a Physics. $3 516296
650 4 $a Astronomy. $3 517668
653 $a Algorithms
653 $a Cosmology
653 $a Effective field theory
653 $a Galaxy population models
653 $a Photometric surveys
653 $a Simulations
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0596
690 $a 0605
690 $a 0606
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Harvard University. $b Astronomy. $3 3173874
773 0 $t Dissertations Abstracts International $g 83-12B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29209880 $z click for full text (PQDT)