26th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY2018)

Session

Cosmology and Gravitational Waves

5

25 Jul 2018, 14:30

Plaza 8

Conveners

Cosmology and Gravitational Waves: Session 1

• Sugumi Kanno

Cosmology and Gravitational Waves: Session 2

• Koji Ishiwata (Kanazawa University)

Cosmology and Gravitational Waves: Session 3

• Sugumi Kanno

229. GW forest from the string axiverse

Prof. Jiro Soda (Kobe University)

25/07/2018, 14:30

Talk (closed)

We study emission processes of gravitational waves (GWs) from string axions with various masses. First, we clarify the conditions of the onset of violent parametric amplification of inhomogeneous axions. Then, we investigate the fate of the instability with lattice simulations. We analyze GW production processes due to the axion dynamics and find the pre-oscillon formation stage is important...

219. Multi-peaked signatures of primordial gravitational waves from multi-step electroweak phase transition

Dr Antonio Morais (CIDMA, Aveiro University (P))

25/07/2018, 14:50

Talk (closed)

The first-order electroweak phase transition in the early universe could occur in multiple steps leading to specific multi-peaked signatures in the primordial gravitational wave (GW) spectrum. In this talk we argue that these signatures are generic phenomena in multi-scalar extensions of the Standard Model. In a simple example of such an extension, we study the emergence of reoccurring and...

212. Gravitational waves from first order electroweak phase transition in models with the U(1)_X gauge symmetry

Dr Toshinori Matsui (Korea Inst. for Advanced Study (KIAS))

25/07/2018, 15:10

Talk (closed)

In this talk, we consider the standard model extension with a dark sector with the $U(1)_X$ Abelian gauge symmetry, which is spontaneously broken by dark Higgs mechanism. We discuss patterns of the electroweak phase transition and detectability of gravitational waves (GWs) when strongly first order phase transition occurs. We find the collider bounds exclude a part of parameter space that...

101. Cosmic Archaeology with Gravitational Waves from Cosmic Strings

Marek Lewicki (Kings College London)

25/07/2018, 15:30

Talk (closed)

Cosmic strings are generic cosmological predictions of many extensions of the Standard Model
of particle physics, such as a U(1)′ symmetry breaking phase transition in the early universe.
Unlike other topological defects, cosmic strings can reach a scaling
regime that maintains a small fixed fraction of the total energy density of the universe from a
very early epoch...

178. Primordial black holes in the axion-like curvaton model and the LIGO events

Kenta Ando (ICRR, University of Tokyo)

25/07/2018, 15:50

Talk (closed)

For a realistic scenario of inflationary primordial black holes (PBHs), a highly blue-tilted power spectrum of primordial perturbations is required. In the axion-like curvaton model, which is base on the supersymmetric axion model, such a spectrum is achieved. I will show that PBHs formed in this model can explain the massive black holes implied by the LIGO gravitational wave (GW) events....

221. Gauge/Fermion Production in Axion Inflation

Kyohei Mukaida (Kavli IPMU)

26/07/2018, 14:30

Talk (closed)

A Chern-Simons coupling with a gauge field is common in axion inflation. It is well known that this coupling leads to interesting phenomenology via the resonant production of helical gauge fields; e.g., gravitational wave, magnetogenesis, leptogenesis, etc. In this talk, we extend the previous analysis to the case where chiral fermions are charged under this gauge field which couples with the...

209. Asymptotic Scale Invariance, Electroweak Vacuum Stability and Higgs Inflation

Dr Kengo Shimada (EPFL)

26/07/2018, 14:50

Talk (closed)

We discuss a possibility that our electroweak vacuum is absolutely stable even if the top Yukawa coupling is larger than the critical value. Such a scenario can be realized without introducing new particles if we adopt a renormalization prescription which respects the asymptotic scale invariance at the quantum level. Instead, the theory becomes non-renormalizable and the perturbative unitarity...

199. Baryogenesis with the non-adiabatic Berry phase

Tomohiro Matsuda (Saitama Institute of Technology)

26/07/2018, 15:10

Talk (closed)

The geometric phase (Pancharatnam-Berry phase) results from the geometrical properties of the parameter space of the Hamiltonian. In this paper, we show that the non-adiabatic Berry phase can generate the effective chemical potential, which can bias the matter and the antimatter number densities without introducing the derivative coupling of the field. Our scenario is consistent with
the...

165. Multistep Single-Field Strong Phase Transitions from New TeV Scale Fermions

Andrei Angelescu (University of Nebraska-Lincoln)

26/07/2018, 15:30

Talk (closed)

In spite of the vast literature on the subject of first order Electroweak Phase Transitions (EWPT), which can provide the necessary conditions for generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this talk, we consider a simple fermionic extension of the Standard Model (SM) involving one $SU(2)_L$ doublet and two singlet...

162. Cosmological domain walls in the Standard Model and beyond

Tomasz Krajewski (University of Warsaw)

26/07/2018, 17:00

Talk (closed)

Cosmological domain walls have been widely studied in numerical lattice simulations in the past. The main effort was to understand the dynamics of domain walls in the case of spontaneous breaking of global discrete symmetries which are often present in supersymmetric theories. It was found that networks formed by cosmological domain walls are (meta)stable if vacua between which walls...

148. Primordial Black Holes from Affleck-Dine Baryogenesis

Hasegawa Fuminori (ICRR, The University of Tokyo, Kashiwa)

26/07/2018, 17:20

Talk (closed)

In this talk, we propose a novel scenario which simultaneously explains O(10)M? primordial black holes (PBHs) in the minimally supersymmetric standard model. Gravitational waves (GWs) events detected by LIGO-Virgo collaboration suggest an existence of black holes as heavy as 30Msol?. In our scenario, as seeds of the PBHs, we make use of the baryon number perturbations which are induced by the...

84. Superconformal Subcritical Hybrid Inflation

Dr Koji Ishiwata (Kanazawa University)

26/07/2018, 17:40

Talk (closed)

We consider D-term hybrid inflation in the framework of
superconformal supergravity. In part of the parameter space,
inflation continues for subcritical inflaton field value.
Consequently, a new type of inflation emerges, which gives
predictions for the scalar spectral index and the tensor-to-scalar
ratio that are consistent with the Planck 2015 results. The
potential in the...

259. Accelerated Cosmic Expansion and the Dark Energy Survey

Martin Crocce (Institute for Space Science (IEEC-CSIC))

26/07/2018, 18:00

Talk (closed)

The striking discovery that the expansion of the Universe is not slowing down but accelerating has turned into one of the main mysteries in Cosmology. Large observational campaigns are being developed to seed light on this and other problems. I will briefly review this effort and then discuss The Dark Energy Survey (DES) : a state-of-the-art large-scale galaxy survey designed to understand,...