arXiv subjects

Masaatsu Horikoshi

Publications and source records attributed to Masaatsu Horikoshi.

4 recordsLinked to original sources

arXiv2018

Gravity loop corrections to the standard model Higgs in Einstein gravity

We study one-loop quantum gravity corrections to the standard model Higgs potential $V(ϕ)$ $\grave{\rm a}$ la Coleman-Weinberg and examine the stability question of $V(ϕ)$ in the energy region of Planck mass scale, $μ\simeq M_{\rm Pl}$ ($M_{\rm Pl}=1.22\times10^{19}{\rm GeV}$). We calculate the gravity one-loop corrections to $V(ϕ)$ in Einstein gravity by using the momentum cut-off $Λ$. We have found that even small gravity corrections compete with the standard model term of $V(ϕ)$ and affect the stability argument of the latter part alone. This is because the latter part is nearly zero in the energy region of $M_{\rm Pl}$.

hep-ph↗

arXiv2017

Dark energy from gravitational corrections

We study physics concerning the cosmological constant problem in the framework of effective field theory and suggest that a dominant part of dark energy can originate from gravitational corrections of vacuum energy, under the assumption that the classical gravitational fields do not couple to a large portion of the vacuum energy effectively, in spite of the coupling between graviton and matters at a microscopic level. Our speculation is excellent with terascale supersymmetry.

hep-th↗

arXiv2016

$α'$-expansion of Anti-Symmetric Wilson Loops in $\mathcal{N}=4$ SYM from Fermi Gas

We study the large 't Hooft coupling expansion of 1/2 BPS Wilson loops in the anti-symmetric representation in $ \mathcal{N}=4 $ super Yang-Mills (SYM) theory at the leading order in the 1/N expansion. Via AdS/CFT correspondence, this expansion corresponds to the $α'$ expansion in bulk type IIB string theory. We show that this expansion can be systematically computed by using the low temperature expansion of Fermi distribution function, known as the Sommerfeld expansion in statistical mechanics. We check numerically that our expansion agrees with the exact result of anti-symmetric Wilson loops recently found by Fiol and Torrents.

hep-th↗

arXiv2016

Quantum gravity corrections to the standard model Higgs in Einstein and $R^2$ gravity

We evaluate quantum gravity corrections to the standard model Higgs potential $V(ϕ)$ a la Coleman-Weinberg and examine the stability question of $V(ϕ)$ at scales of Planck mass $M_{\rm Pl}$. We compute the gravity one-loop corrections by using the momentum cut-off in Einstein gravity. The gravity corrections affect the potential in a significant manner for the value of $Λ= (1 - 3)M_{\rm Pl}.$ In view of reducing the UV cut-off dependence we also make a similar study in the $R^2$ gravity.

hep-ph↗