Zobrazeno 1 - 10
of 98
pro vyhledávání: '"P. Ramkishor"'
We numerically study axion-U(1) inflation, focusing on the regime where the coupling between axions and gauge fields results in significant backreaction from the amplified gauge fields during inflation. These amplified gauge fields not only generate
Externí odkaz:
http://arxiv.org/abs/2411.04854
We describe a novel proposal for inflationary magnetogenesis by identifying the non-Abelian sector of Spectator Chromo Natural Inflation (SCNI) with the $\rm{SU(2)}_{\rm L}$ sector of the Standard Model. This mechanism relies on the recently discover
Externí odkaz:
http://arxiv.org/abs/2408.17413
We apply the inverse Gertsenshtein effect, i.e., the graviton-photon conversion in the presence of a magnetic field, to constrain high-frequency gravitational waves (HFGWs). Using existing astrophysical measurements, we compute upper limits on the GW
Externí odkaz:
http://arxiv.org/abs/2312.17636
Publikováno v:
JCAP04(2024)018
We consider the effects of backreaction on axion-SU(2) dynamics during inflation. We use the linear evolution equations for the gauge field modes and compute their backreaction on the background quantities numerically using the Hartree approximation.
Externí odkaz:
http://arxiv.org/abs/2311.07557
Publikováno v:
J. Cosmol. Astropart. Phys. 12 (2023) 042
We study the gravitational wave (GW) spectrum produced by acoustic waves in the early universe, such as would be produced by a first order phase transition, focusing on the low-frequency side of the peak. We confirm with numerical simulations the Sou
Externí odkaz:
http://arxiv.org/abs/2308.12916
Publikováno v:
J. Plasma Phys. 89, 905890606 (2023)
In decaying magnetohydrodynamic (MHD) turbulence with a strong magnetic field, the spectral magnetic energy density is known to increase with time at small wavenumbers $k$, provided the spectrum at low $k$ is sufficiently steep. This process is calle
Externí odkaz:
http://arxiv.org/abs/2307.04602
Autor:
Carenza, Pierluca, Sharma, Ramkishor, Marsh, M. C. David, Brandenburg, Axel, Ravensburg, Eike
Publikováno v:
Phys.Rev.D 108 (2023) 10, 103029
The interconversion of axionlike particles (ALPs) and photons in magnetised astrophysical environments provides a promising route to search for ALPs. The strongest limits to date on light ALPs use galaxy clusters as ALP-photon converters. However, su
Externí odkaz:
http://arxiv.org/abs/2208.04333
Publikováno v:
Mon. Not. Roy. Astron. Soc. 518, 3312-3325 (2023)
The magnetic fields in galaxy clusters and probably also in the interstellar medium are believed to be generated by a small-scale dynamo. Theoretically, during its kinematic stage, it is characterized by a Kazantsev spectrum, which peaks at the resis
Externí odkaz:
http://arxiv.org/abs/2207.09414
Autor:
RAMKISHOR KURMI, SATISH DEVRAM LANDE, INDRA MANI, KAPIL ATMARAM CHOBHE, ROAF AHMAD PARRAY, RAJEEV KUMAR, LALIT BIRLA, SUKANTA DASH
Publikováno v:
The Indian Journal of Agricultural Sciences, Vol 94, Iss 8 (2024)
Precise application of nitrogenous fertilizers mainly urea ammonium nitrate (UAN) and granular urea (both pure and neem-coated) in aqueous form, is critically important for basal and foliar applications. The physicochemical properties of aqueous solu
Externí odkaz:
https://doaj.org/article/6800a1d90d544edb84e7bc8962246bf1
The Saffman helicity invariant of Hosking and Schekochihin (2021, PRX 11, 041005), which we here call the Hosking integral, has emerged as an important quantity that may govern the decay properties of magnetically dominated nonhelical turbulence. Usi
Externí odkaz:
http://arxiv.org/abs/2206.07513