Signature of short distance physics on inflation power spectrum and CMB anisotropy (2008)
Das, Suratna, Mohanty, Subhendra
We compute the two-point correlation function of the interacting field in terms of the two-point function of the free-field in a quasi-de Sitter space using the K\"{a}ll\'{e}n-Lehmann representation....
Natural inflation at the GUT scale (2008)
Mohanty, Subhendra, Nautiyal, Akhilesh
Natural inflation driven by Pseudo-Nambu-Goldstone bosons have a problem that the nearly scale invariant spectrum of density perturbations is attained only when the symmetry breaking scale is of the...
Test of unparticle long range forces from perihelion precession of Mercury (2007)
Das, Suratna, Mohanty, Subhendra, Rao, Kumar
Unparticle exchange gives rise to long range forces which deviate from the inverse square law due to non-canonical dimension of unparticles. It is well known that a potential of the form $r^{-n}$...
Prospects for GMRT to Observe Radio Waves from UHE Particles Interacting with the Moon (2007)
Panda, Sukanta, Mohanty, Subhendra, Janardhan, Padmanabhan, Stål, Oscar
Ultra high energy (UHE) particles of cosmic origin impact the lunar regolith and produce radio signals through Askaryan effect, signals that can be detected by Earth based radio telescopes. We...
Gravitational Leptogenesis (2006)
Lambiase, Gaetano, Mohanty, Subhendra
We introduce a dimension five CP violating coupling between the Ricci scalar and fermions. This operator splits the energy level between neutrinos and anti-neutrinos and can generate a...
Imprint of spatial curvature on inflation power spectrum (2006)
Masso, Eduard, Mohanty, Subhendra, Nautiyal, Akhilesh, Zsembinszki, Gabriel
If the universe had a large curvature before inflation there is a deviation from the scale invariant perturbations of the inflaton at the beginning of inflation. This may have some effect on the CMB...
Enhanced polarization of CMB from thermal gravitational waves (2006)
Bhattacharya, Kaushik, Mohanty, Subhendra, Nautiyal, Akhilesh
If inflation was preceded by a radiation era then at the time of inflation there will exist a decoupled thermal distribution of gravitons. Gravitational waves generated during inflation will be...
Leptogenesis from Spin-Gravity Coupling Following Inflation (2005)
Mohanty, Subhendra, Prasanna, A. R., Lambiase, G.
The energy levels of the left and the right handed neutrinos is split in the background of gravitational waves generated during inflation which in presence of lepton number violating interactions...
Temperature of the inflaton and duration of inflation from WMAP data (2005)
Bhattacharya, Kaushik, Mohanty, Subhendra, Rangarajan, Raghavan
If the initial state of the inflaton field is taken to have a thermal distribution instead of the conventional zero particle vacuum state then the curvature power spectrum gets modified by a...
Contribution of Ue3 to geo-neutrino flux (2005)
We show that a non-zero Ue3 close to the CHOOZ bound ($Sin^2 2 \theta_{13} \simeq 0.16$ 90% CL) can change the geo-neutrino flux by 12%. Geo-neutrino detection in Kamland with a exposure of $3 \times...
Neutrino magnetic moments and photo-disintegration of deuterium (2004)
Grifols, J. A., Masso, Eduard, Mohanty, Subhendra
Neutrinos with non-zero magnetic moments can dissociate deuterium nuclei by a photon exchange, in addition to the weak neutral current process. We calculate the neutrino-magnetic moment induced...
Joshipura, Anjan S., Mohanty, Subhendra
In the minimal standard model it is possible to gauge any one of the following global symmetries in an anomaly free way: (i)$L_{e}-L_{\mu}$, (ii) $L_{e}-L_{\tau}$ or (iii) $L_{\mu}-L_{\tau}$. If the...
Prasanna, A. R., Mohanty, Subhendra
We study interactions of electro-magnetic fields with the curvature tensor of the form $\lambda R_{\mu \nu \alpha \beta}F^{\mu \nu}F^{\alpha \beta}$. Such coupling terms though are invariant under...
Joshipura, Anjan S., Mohanty, Subhendra
Electroweak radiative corrections can generate the neutrino (mass)$^2$ difference required for the large mixing angle solution (LMA) to the solar neutrino problem if two of the neutrinos are assumed...
Determination of the age of the earth from Kamland measurement of geo-neutrinos (2003)
The low energy component of the antineutrino spectrum observed in the recent Kamland experiment has significant contribution from the radioactive decay of $^{238}U$ and $^{232}Th$ in the crust and...
Bounds on neutrino magnetic moment tensor from solar neutrinos (2002)
Joshipura, Anjan S., Mohanty, Subhendra
Solar neutrinos with non-zero magnetic moments will contribute to the electron scattering rates in the Super-Kamiokande experiment. The magnetic moment scattering events in Super-K can be...
Baryogenesis from primordial tensor perturbations (2002)
Mohanty, Subhendra, Mukhopadhyay, B., Prasanna, A. R.
During inflation primordial quantum fluctuations of the spacetime metric become classical and there is a spontaneous CPT violation by the spin connection coupling terms of the metric with fermions....
Constraints on decay plus oscillation solutions of the solar neutrino problem (2002)
Joshipura, Anjan S., Masso, Eduard, Mohanty, Subhendra
We examine the constraints on non-radiative decay of neutrinos from the observations of solar neutrino experiments. The standard oscillation hypothesis among three neutrinos solves the solar and...
Bounds on tau neutrino magnetic moment and charge radius from Super-K and SNO observations (2001)
Joshipura, Anjan S., Mohanty, Subhendra
Neutrinos can scatter electrons in water detectors through their magnetic moments and charge radii in addition to the charged and neutral currents channels. The recent solar neutrino charged current...
Mohanty, Subhendra, Prasanna, A. R.
We solve the wave equation for the electromagnetic field tensors associated with the CMBR photons in a universe with scalar metric perturbations. We show that the coupling of the electromagnetic...
Effects of non-factorizable metric on neutrino oscillation inside supernova (2000)
Mahanta, Uma, Mohanty, Subhendra
In this paper we construct the interaction potential between the dense supernova core and neutrinos due to the exchange of light radions in the Randall-Sundrum scenario. We then show that the radion...
Grifols, J. A., Masso, Eduard, Mohanty, Subhendra
We generalize the Schwinger mechanism and calculate the probability of the decay of intense electromagnetic fields to pseudoscalar particles. We also point out that our estimate for axion emission in...
Grifols, J. A., Masso, Eduard, Mohanty, Subhendra, Shajesh, K. V.
We calculate the rate for pair production of light pseudoscalars by strong inhomogeneous and static electric (magnetic) fields. We show that, in the case of axions, the stability of atoms over cosmic...
Neutrino oscillations and the effect of the finite lifetime of the neutrino source (1999)
Grimus, Walter, Mohanty, Subhendra, Stockinger, Peter
We consider a neutrino source at rest and discuss a condition for the existence of neutrino oscillations which derives from the finite lifetime $\tau_S$ of the neutrino source particle. This...
Texture of a Four-Neutrino Mass Matrix (1998)
Mohanty, Subhendra, Roy, D. P., Sarkar, Utpal
We propose a simple texture of the neutrino mass matrix with one sterile neutrino along with the three standard ones. It gives maximal mixing angles for $\nu_e \to \nu_S$ and $\nu_\mu \to \nu_\tau$...
Astrophysical signals of P and T violation by gravity (1998)
A. R. Prasanna, Subhendra Mohanty
We study the observational consequences of the leading order P and T violating gauge invariant graviton-photon interactions. Such interactions give rise to gravitational birefringence - the velocity...
Cerenkov Radiation By Charged Particles in an External Gravitational Field (1998)
Anshu Gupta, Subhendra Mohanty, Manoj K. Samal
Charged particles in the geodesic trajectory of an external gravitational field do not emit electromagnetic radiation. This is expected from the application of the equivalence principle. We show here...
Constraints on background torsion field from K physics (1998)
Mohanty, Subhendra, Sarkar, Utpal
We point out that a background torsion field will produce an effective potential to the $K$ and $\bar{K}$ with opposite signs. This allows us to constrain the background torsion field from the $K_L$...
Photon propagation in Einstein and Higher Derivative Gravity (1998)
Mohanty, Subhendra, Prasanna, A. R.
In the wave equation obeyed by electromagnetic fields in curved spacetime there are Riemann and Ricci curvature coupling terms to the photon polarisation, which result in a polarisation dependent...
Emission of electron density waves by neutrinos in a dense medium (1997)
Mohanty, Subhendra, Sahu, Sarira, Goswami, Srubabati
We study the production of electron density waves by neutrinos propagating through a plasma. We treat this process in field theoretically as a Cerenkov emission of phonons (quanta of electron density...
Optical Activity of a Neutrino Gas (1997)
Mohanty, Subhendra, Nieves, Jose F., Pal, Palash B.
For photons that propagate through a gas of neutrinos with a non-zero chemical potential, the left-handed and right-handed polarization modes acquire different dispersion relations. This is due to...
Neutrino helicity flip by Cerenkov emission and absorption of plasmons in supernova (1997)
Mohanty, Subhendra, Sahu, Sarira
We show that in a supernova core the longitudinal photon (plasmon) has a space-like dispersion and Cerenkov absorption and emission of such photons is kinematically allowed. If the neutrino has a...
Source lifetime dependence of neutrino oscillations - a simple wave-function derivation (1997)
When neutrinos are produced from long lived particles the life-time of the source particle affects the flavour conversion probability formula. Due to this source dependence experiments (like LSND)...
Comment on ''Cerenkov radiation by neutrinos in a supernova core" (1997)
Mohanty, Subhendra, Sahu, Sarira
The helicity changing Cerenkov radiation in a supernova core was used earlier to put a restrictive bound on the neutrino magnetic moment. Subsequently it was pointed out, that this result was based...
Production process dependence of neutrino flavor conversion (1997)
We perform a covariant wave-packet analysis of neutrino oscillations taking into account the lifetime of the neutrino production process . We find that flavor oscillations in space are washed out...
Covariant treatment of neutrino oscillations (1997)
We perform a covariant wavepacket analysis of neutrino oscillations taking into account the lifetime of the neutrino production process . We find that flavour oscillations in space are washed out...
Geodesic Deviation of Photons in Einstein and Higher Derivative Gravity (1997)
Mohanty, Subhendra, Prasanna, A. R.
We derive the wave equation obeyed by electromagnetic fields in curved spacetime. We find that there are Riemann and Ricci curvature coupling terms to the photon polarisation which result in a...
Radiative Corrections To Gravitational Coupling Of Neutrinos And Neutrino Oscillations (1996)
It is well known that if the gravitational coupling of neutrino's is flavour dependent then this can give rise to neutrino oscillations which can explain the solar and atmospheric neutrino anomalies....
Astrophysical signals of P and T violation by gravity (1995)
Prasanna, A. R., Mohanty, Subhendra
We study the observational consequences of the leading order P and T violating gauge invariant graviton-photon interactions. Such interactions give rise to gravitational birefringence - the velocity...
Cerenkov radiation by charged particles in an external gravitational field (1995)
Gupta, Anshu, Mohanty, Subhendra, Samal, Manoj K.
Charged particles in the geodesic trajectory of an external gravitational field do not emit electromagnetic radiation. This is expected from the application of the equivalence principle. We show here...
Cerenkov radiation by neutrinos in a supernova core (1995)
Mohanty, Subhendra, Samal, Manoj K.
Neutrinos with a magnetic dipole moment propagating in a medium with a velocity larger than the phase velocity of light emit photons by the Cerenkov process. The Cerenkov radiation is a helicity flip...
Solution of the Strong CP problem in the low energy effective Standard Model (1994)
We consider the low energy effective chiral theory of QCD mesons and the electroweak Goldstone bosons. In this effective theory the pion sector contributes to the gauge boson masses and the Yukawa...
Particle Physics Bounds from the Hulse-Taylor Binary (1994)
Mohanty, Subhendra, Panda, Prafulla Kumar
The orbital period of the binary pulsar PSR 1913+16 has been observed to decrease at the rate of $2.40\times 10^{-12}$ s/s which agrees with the prediction of the quadropole formula for gravitational...
Mohanty, Subhendra, Nayak, S. N.
Pseudo-Goldstone bosons couple with photons through a P and T violating interaction of the form ${\cal {L_I}}=g_{a\gamma \gamma}~ a F\tilde F$. Strong magnetic fields in rotating compact stars induce...
Mohanty, Subhendra, Nayak, S. N.
Pseudo-Goldstone bosons couple with photons through a P and T violating interaction of the form ${\cal {L_I}}=g_{a\gamma \gamma}~ a F\tilde F$. Strong magnetic fields in rotating compact stars induce...
Mohanty, Subhendra, Nayak, S. N., Sahu, Sarira
We study the low energy effective field theory of fermions with electric and magnetic dipole moments at finite temperature. We find that at one loop there is an interaction term of the Chern-Simon...
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