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New Physics from Subatomic to Galact...

Mondino, Cristina.

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New Physics from Subatomic to Galactic Scales.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	New Physics from Subatomic to Galactic Scales./
作者:	Mondino, Cristina.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	185 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-05, Section: B.
Contained By:	Dissertations Abstracts International82-05B.
標題:	Theoretical physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28002428
ISBN:	9798691231803

New Physics from Subatomic to Galactic Scales.
Mondino, Cristina.

New Physics from Subatomic to Galactic Scales. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 185 p.

Source: Dissertations Abstracts International, Volume: 82-05, Section: B.

Thesis (Ph.D.)--New York University, 2020.

This item must not be sold to any third party vendors.

The genesis and history of the Universe cannot be explained by the Standard Model (SM) of particle physics, as confirmed by an overwhelming amount of astrophysical and cosmological observations. At the same time, a clear signal of new physics has yet to be seen in dedicated terrestrial and astronomical searches. The quest towards a better understanding of the nature of Dark Matter (DM) is now open to alternative theoretical scenarios and new experimental methods that can shed light on its properties.The first part of this thesis will discuss viable models where DM is a relic from the early Universe, exploring deviations from the standard paradigm of thermally produced DM, the Weakly Interacting Massive Particle. Relaxing some of the usual assumptions broadens the parameter space available and motivates the program of ongoing and future laboratory searches for thermal DM, including new direct detection, fixed target, and long-lived particle experiments, which complement astrophysical and cosmological probes. We will describe a mechanism where the DM energy density is set by mutual annihilations among species with sizable mass splittings and show how it naturally points to masses exponentially lighter than the electroweak scale. We will also discuss a simple extension of the SM, a new massive dark photon that kinetically mixes with electromagnetism, describing how the dark Higgs field associated with the dark photon mass provides a viable DM candidate.The second part of this thesis focuses on two strategies to look for imprints of new physics on experimental data. The first technique uses precision measurements of kinematic distributions at the LHC to search for small tell-tale deviations from SM predictions in the high energy tails. This method is complementary to traditional "bump hunts" at colliders and it is best suited to detect new particles that are too heavy to be directly produced. We will apply it to top pair quark production measurements, probing new physics that preferentially couples to the heaviest of the SM quarks. The second strategy employs results from the Gaia satellite to look for the apparent motion of background stars induced by gravitational lensing effects from collapsed dark structures in the Milky Way. Such probes of DM properties that rely solely on its gravitational interaction are especially important as they forego the need for model-dependent DM self-interactions or non minimal couplings to the SM. Our analysis shows how near future precision measurements of stars positions and velocities can test primordial perturbations on sub-galactic scales, that have yet to be detected.

ISBN: 9798691231803Subjects--Topical Terms:

2144760
Theoretical physics.
Subjects--Index Terms:

Collider Physics

New Physics from Subatomic to Galactic Scales.
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520 $a The genesis and history of the Universe cannot be explained by the Standard Model (SM) of particle physics, as confirmed by an overwhelming amount of astrophysical and cosmological observations. At the same time, a clear signal of new physics has yet to be seen in dedicated terrestrial and astronomical searches. The quest towards a better understanding of the nature of Dark Matter (DM) is now open to alternative theoretical scenarios and new experimental methods that can shed light on its properties.The first part of this thesis will discuss viable models where DM is a relic from the early Universe, exploring deviations from the standard paradigm of thermally produced DM, the Weakly Interacting Massive Particle. Relaxing some of the usual assumptions broadens the parameter space available and motivates the program of ongoing and future laboratory searches for thermal DM, including new direct detection, fixed target, and long-lived particle experiments, which complement astrophysical and cosmological probes. We will describe a mechanism where the DM energy density is set by mutual annihilations among species with sizable mass splittings and show how it naturally points to masses exponentially lighter than the electroweak scale. We will also discuss a simple extension of the SM, a new massive dark photon that kinetically mixes with electromagnetism, describing how the dark Higgs field associated with the dark photon mass provides a viable DM candidate.The second part of this thesis focuses on two strategies to look for imprints of new physics on experimental data. The first technique uses precision measurements of kinematic distributions at the LHC to search for small tell-tale deviations from SM predictions in the high energy tails. This method is complementary to traditional "bump hunts" at colliders and it is best suited to detect new particles that are too heavy to be directly produced. We will apply it to top pair quark production measurements, probing new physics that preferentially couples to the heaviest of the SM quarks. The second strategy employs results from the Gaia satellite to look for the apparent motion of background stars induced by gravitational lensing effects from collapsed dark structures in the Milky Way. Such probes of DM properties that rely solely on its gravitational interaction are especially important as they forego the need for model-dependent DM self-interactions or non minimal couplings to the SM. Our analysis shows how near future precision measurements of stars positions and velocities can test primordial perturbations on sub-galactic scales, that have yet to be detected.
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653 $a Physics Beyond the Standard Model
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