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Theoretical & Phenomenological Explorations of the Dark Sector.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Theoretical & Phenomenological Explorations of the Dark Sector./
作者:	Parikh, Aditya Deepak.
面頁冊數:	1 online resource (301 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
標題:	Particle physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29210212click for full text (PQDT)
ISBN:	9798819382790

Theoretical & Phenomenological Explorations of the Dark Sector.
Parikh, Aditya Deepak.

Theoretical & Phenomenological Explorations of the Dark Sector. - 1 online resource (301 pages)

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

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

Includes bibliographical references

The particle nature of dark matter and its interactions are issues of central importance with the current understanding of particle physics and clearly indicate the need to go beyond the Standard Model. The lack of detection of a WIMP has spurred both experimental and theoretical innovation. A wide array of direct and indirect detection techniques have vastly expanded the experimentally probed parameter space. This includes small tabletop experiments, large underground detectors, and ground- and space-based telescopes searching for astrophysical and cosmological signals. In conjunction, theorists have gone beyond the standard dark matter scenario by adding new fields, interactions, and portals connecting to the Standard Model. The rich phenomenology associated with these models predict novel signatures and the experimental data provide exciting avenues to search for signs of new physics.In this dissertation, we present progress on exploring dark sector and BSM phenomenology from various lenses. In the most dire scenarios, dark matter does not couple to the Standard Model and only possesses self-interactions. Despite this, the underlying interactions produce cross sections which exhibit significantly different behaviors as a function of velocity. We develop a formalism to compute the cross section, that carefully matches the effective quantum mechanics and QFT descriptions, and takes into account Sommerfeld enhancement, a non-perturbative effect relevant in the nonrelativistic regime. We find that pseudoscalar and axial-vector type interactions don't exhibit this enhancement. This formalism consistently deals with the pseudoscalar potential, which a priori seems singular. This leads us to propose the Quantum Mechanics Swampland, where we begin to delineate the boundary between quantum mechanical potentials which can be completed into a QFT and those which cannot. Next, we consider the more optimistic scenario where that dark sector is connected to the Standard Model via a portal. We propose an explanation to the Galactic Center Excess, a robust gamma-ray signal possibly originating from annihilating dark matter. We consider a CP-violating Higgs portal which allows Majorana fermion dark matter to annihilate to Standard Model final states. Measurements of the electron EDM place stringent constraints on viable parameter space. This builds on a separate analysis of the ACME experiment's constraint on the electron EDM and the implications this has for generic models of BSM physics. Precision measurements are an interesting window into models of new physics. In a similar spirit to the analysis of the EDM results, we also consider the anomalous measurement of the W boson mass from the CDF experiment. We characterize this tension in terms of the oblique parameters, and discuss various models of new physics which can generate the required values to alleviate the tension between the measurement and Standard Model prediction. Finally, we consider a separate portal where the dark sector is endowed with a U(1) and kinetically mixes with the Standard Model U(1). With the expectation that the dark and visible sectors must ultimately embed into a complete theory of quantum gravity, we use the Swampland conjectures to place constraints on the size of the kinetic mixing parameter.

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

Mode of access: World Wide Web

ISBN: 9798819382790Subjects--Topical Terms:

3433269
Particle physics.
Subjects--Index Terms:

Beyond standard model theoriesIndex Terms--Genre/Form:

542853
Electronic books.

Theoretical & Phenomenological Explorations of the Dark Sector.
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504 $a Includes bibliographical references
520 $a The particle nature of dark matter and its interactions are issues of central importance with the current understanding of particle physics and clearly indicate the need to go beyond the Standard Model. The lack of detection of a WIMP has spurred both experimental and theoretical innovation. A wide array of direct and indirect detection techniques have vastly expanded the experimentally probed parameter space. This includes small tabletop experiments, large underground detectors, and ground- and space-based telescopes searching for astrophysical and cosmological signals. In conjunction, theorists have gone beyond the standard dark matter scenario by adding new fields, interactions, and portals connecting to the Standard Model. The rich phenomenology associated with these models predict novel signatures and the experimental data provide exciting avenues to search for signs of new physics.In this dissertation, we present progress on exploring dark sector and BSM phenomenology from various lenses. In the most dire scenarios, dark matter does not couple to the Standard Model and only possesses self-interactions. Despite this, the underlying interactions produce cross sections which exhibit significantly different behaviors as a function of velocity. We develop a formalism to compute the cross section, that carefully matches the effective quantum mechanics and QFT descriptions, and takes into account Sommerfeld enhancement, a non-perturbative effect relevant in the nonrelativistic regime. We find that pseudoscalar and axial-vector type interactions don't exhibit this enhancement. This formalism consistently deals with the pseudoscalar potential, which a priori seems singular. This leads us to propose the Quantum Mechanics Swampland, where we begin to delineate the boundary between quantum mechanical potentials which can be completed into a QFT and those which cannot. Next, we consider the more optimistic scenario where that dark sector is connected to the Standard Model via a portal. We propose an explanation to the Galactic Center Excess, a robust gamma-ray signal possibly originating from annihilating dark matter. We consider a CP-violating Higgs portal which allows Majorana fermion dark matter to annihilate to Standard Model final states. Measurements of the electron EDM place stringent constraints on viable parameter space. This builds on a separate analysis of the ACME experiment's constraint on the electron EDM and the implications this has for generic models of BSM physics. Precision measurements are an interesting window into models of new physics. In a similar spirit to the analysis of the EDM results, we also consider the anomalous measurement of the W boson mass from the CDF experiment. We characterize this tension in terms of the oblique parameters, and discuss various models of new physics which can generate the required values to alleviate the tension between the measurement and Standard Model prediction. Finally, we consider a separate portal where the dark sector is endowed with a U(1) and kinetically mixes with the Standard Model U(1). With the expectation that the dark and visible sectors must ultimately embed into a complete theory of quantum gravity, we use the Swampland conjectures to place constraints on the size of the kinetic mixing parameter.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Particle physics. $3 3433269
650 4 $a Theoretical physics. $3 2144760
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653 $a Effective field theory
653 $a Quantum field theory
653 $a Swampland conjectures
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