The inflationary universe: a primordial bridge between fundamental theory and observable phenomena - INSPIRE

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The inflationary universe: a primordial bridge between fundamental theory and observable phenomena

Vikas Aragam
(
- Texas U.
)

Dec, 2023

Thesis: PhD

U. Texas

(Dec, 2023)

DOI:

10.26153/tsw/52411

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Abstract: (submitter)

This dissertation encapsulates three connected projects that I have worked on as a graduate student. I begin with an introduction to the beautiful intersection of fundamental physics and the primordial universe that is inflationary cosmology. I then present the three main chapters of this dissertation. The first explores the possibility of realizing inflation in steep potentials via multi-field dynamics, which draws on motivations from string theory and the Swampland program. The second chapter examines multi-field inflation at a more fundamental level by rigorously constructing the types of solutions we can achieve in models with features expected in UV-complete theories. The last chapter shifts focus to the gravitational wave signatures that multi-field models of inflation exhibit, with special emphasis on the conditions for these signatures to be observable in upcoming gravitational wave observatories.

References(282)

Figures(0)

[1]

Multi-field Inflation in High-Slope Potentials

- JCAP 04 (2020) 022
•
e-Print:
- 1905.07495
•
DOI:
- 10.1088/1475-7516/2020/04/022

[2]

The Multi-Field, Rapid-Turn Inflationary Solution

- JHEP 03 (2021) 009
•
e-Print:
- 2010.15933
•
DOI:
- 10.1007/JHEP03(2021)009

[3]

Primordial stochastic gravitational wave backgrounds from a sharp feature in three-field inflation. Part I. The radiation era

Vikas Aragam
(
- Texas U.
)
,
Sonia Paban
(
- Texas U.
)
,
Robert Rosati
(
- NASA, Marshall and
- UC, Santa Cruz, Astron. Astrophys.
)

- JCAP 11 (2023) 014
•
e-Print:
- 2304.00065
•
DOI:
- 10.1088/1475-7516/2023/11/014

[4]

Planck 2018 results. X. Constraints on inflation

Planck

Collaboration

•

Y. Akrami
(
- Leiden U. and
- Inst. Theor. Astrophys., Oslo
)

et al.

- Astron.Astrophys. 641 (2020) A10
•
e-Print:
- 1807.06211
•
DOI:
- 10.1051/0004-6361/201833887

[5]

Turning in the landscape: A new mechanism for generating primordial black holes

- Phys.Lett.B 841 (2023) 137921
•
e-Print:
- 2004.08369
•
DOI:
- 10.1016/j.physletb.2023.137921

[6]

Inflation

Daniel Baumann
(
- Princeton, Inst. Advanced Study and
- Harvard U., Phys. Dept.
)

[7]

The Strong Multifield Slowroll Condition and Spiral Inflation

I-Sheng Yang
(
- Columbia U.
)

- Phys.Rev.D 85 (2012) 123532
•
e-Print:
- 1202.3388
•
DOI:
- 10.1103/PhysRevD.85.123532

[8]

The string swampland constraints require multi-field inflation

Ana Achúcarro
(
- Leiden U. and
- Basque U., Bilbao
)
,
Gonzalo A. Palma
(
- Chile U., Santiago
)

- JCAP 02 (2019) 041
•
e-Print:
- 1807.04390
•
DOI:
- 10.1088/1475-7516/2019/02/041

[9]

Hyperbolic Inflation

Adam R. Brown
(
- Stanford U., Phys. Dept.
)

- Phys.Rev.Lett. 121 (2018) 25, 251601
•
e-Print:
- 1705.03023
•
DOI:
- 10.1103/PhysRevLett.121.251601

[10]

Steep inflation: Ending brane world inflation by gravitational particle production

- Phys.Rev.D 64 (2001) 023509
•
e-Print:
- astro-ph/0006421
•
DOI:
- 10.1103/PhysRevD.64.023509

[11]

Steep inflation followed by Born-Infeld reheating

M. Sami
(
- IUCAA, Pune
)
,
N. Dadhich
(
- IUCAA, Pune
)
,
Tetsuya Shiromizu
(
- Tokyo Inst. Tech. and
- Waseda U., RISE
)

- Phys.Lett.B 568 (2003) 118-126
•
e-Print:
- hep-th/0304187
•
DOI:
- 10.1016/j.physletb.2003.07.001

[12]

Naturally inflating on steep potentials through electromagnetic dissipation

- Phys.Rev.D 81 (2010) 043534
•
e-Print:
- 0908.4089
•
DOI:
- 10.1103/PhysRevD.81.043534

[13]

Chromo-Natural Inflation: Natural inflation on a steep potential with classical non-Abelian gauge fields

Peter Adshead
(
- Chicago U., KICP and
- Chicago U., EFI
)
,
Mark Wyman
(
- Chicago U., KICP and
- Chicago U., EFI and
- Chicago U., Astron. Astrophys. Ctr. and
- Chicago U.
)

- Phys.Rev.Lett. 108 (2012) 261302
•
e-Print:
- 1202.2366
•
DOI:
- 10.1103/PhysRevLett.108.261302

[14]

Non-Gaussianities and chiral gravitational waves in natural steep inflation

- Phys.Rev.D 85 (2012) 123537
•
e-Print:
- 1203.5849
•
DOI:
- 10.1103/PhysRevD.85.123537

[15]

Tachyon inflation with steep potentials

- Phys.Rev.D 95 (2017) 10, 103506
•
e-Print:
- 1508.04760
•
DOI:
- 10.1103/PhysRevD.95.103506

[16]

Magnon Inflation: Slow Roll with Steep Potentials

Peter Adshead
(
- Illinois U., Urbana
)
,
Diego Blas
(
- CERN
)
,
C.P. Burgess
(
- McMaster U. and
- Perimeter Inst. Theor. Phys.
)
,
Peter Hayman
(
- McMaster U. and
- Perimeter Inst. Theor. Phys.
)
,
Subodh P Patil
(
- Geneva U.
)

- JCAP 11 (2016) 009
•
e-Print:
- 1604.06048
•
DOI:
- 10.1088/1475-7516/2016/11/009

[17]

Steep Eternal Inflation and the Swampland

Konstantinos Dimopoulos
(
- Lancaster U.
)

- Phys.Rev.D 98 (2018) 12, 123516
•
e-Print:
- 1810.03438
•
DOI:
- 10.1103/PhysRevD.98.123516

[18]

Multiple field inflation

David Wands
(
- Portsmouth U., ICG
)

- Lect.Notes Phys. 738 (2008) 275-304
•
e-Print:
- astro-ph/0702187
•
DOI:
- 10.1007/978-3-540-74353-8_8

[19]

On Non-Canonical Kinetic Terms and the Tilt of the Power Spectrum

Sera Cremonini
(
- Cambridge U., DAMTP and
- Texas A-M
)
,
Zygmunt Lalak
(
- Warsaw U.
)
,
Krzysztof Turzynski
(
- Warsaw U.
)

- Phys.Rev.D 82 (2010) 047301
•
e-Print:
- 1005.4347
•
DOI:
- 10.1103/PhysRevD.82.047301

[20]

Strongly Coupled Perturbations in Two-Field Inflationary Models

Sera Cremonini
(
- Cambridge U., DAMTP and
- Texas A-M
)
,
Zygmunt Lalak
(
- Warsaw U.
)
,
Krzysztof Turzynski
(
- Warsaw U.
)

- JCAP 03 (2011) 016
•
e-Print:
- 1010.3021
•
DOI:
- 10.1088/1475-7516/2011/03/016

[21]

Features of heavy physics in the CMB power spectrum

Ana Achucarro
(
- Leiden U. and
- Basque U., Bilbao
)
,
Jinn-Ouk Gong
(
- Leiden U.
)
,
Sjoerd Hardeman
(
- Leiden U.
)
,
Gonzalo A. Palma
(
- Chile U., Beauchef
)
,
Subodh P. Patil
(
- Ecole Normale Superieure and
- Ecole Polytechnique, CPHT
)

- JCAP 01 (2011) 030
•
e-Print:
- 1010.3693
•
DOI:
- 10.1088/1475-7516/2011/01/030

[22]

Geometrical Destabilization of Inflation

Sébastien Renaux-Petel
(
- ILP, Paris and
- Paris, Inst. Astrophys.
)
,
Krzysztof Turzyński
(
- Warsaw U.
)

- Phys.Rev.Lett. 117 (2016) 14, 141301
•
e-Print:
- 1510.01281
•
DOI:
- 10.1103/PhysRevLett.117.141301

[23]

On the Cosmological Implications of the String Swampland

Prateek Agrawal
(
- Harvard U., Phys. Dept.
)
,
Georges Obied
(
- Harvard U., Phys. Dept.
)
,
Paul J. Steinhardt
(
- Princeton U. and
- Princeton U., CTP and
- New York U., CCPP
)
,
Cumrun Vafa
(
- Harvard U., Phys. Dept.
)

- Phys.Lett.B 784 (2018) 271-276
•
e-Print:
- 1806.09718
•
DOI:
- 10.1016/j.physletb.2018.07.040

[24]

De Sitter Space and the Swampland

Georges Obied
(
- Harvard U., Phys. Dept.
)
,
Hirosi Ooguri
(
- Caltech and
- Tokyo U., IPMU
)
,
Lev Spodyneiko
(
- Caltech
)
,
Cumrun Vafa
(
- Harvard U., Phys. Dept.
)

e-Print:
- 1806.08362

[25]

Distance and de Sitter Conjectures on the Swampland

Hirosi Ooguri
(
- Caltech and
- Tokyo U., IPMU
)
,
Eran Palti
(
- Munich, Max Planck Inst.
)
,
Gary Shiu
(
- Wisconsin U., Madison
)
,
Cumrun Vafa
(
- Harvard U., Phys. Dept.
)

- Phys.Lett.B 788 (2019) 180-184
•
e-Print:
- 1810.05506
•
DOI:
- 10.1016/j.physletb.2018.11.018

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